Generac Portable Generator 004912 0 004912 1 004913 0 004913 1 004913 2 User Manual

CENTURION  
®
Owner’s Manual  
Liquid-cooled, Prepackaged Standby Generators  
Models: 004912-0, 004912-1  
(15 kW LP/15 kW Natural Gas)  
120/240V Single-phase w/ 100 Amp  
Transfer Switch  
004913-0, 004913-1, 004913-2  
(25 kW LP/25 kW Natural Gas)  
120/240V Single-phase w/ 200 Amp  
Transfer Switch  
*This manual should remain with the unit.  
DANGER  
ONLY QUALIFIED ELECTRICIANS OR CONTRACTORS  
SHOULD ATTEMPT INSTALLATION!!  
DEADLY EXHAUST FUMES. OUTDOOR INSTALLATION ONLY!!  
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Table of Contents  
Centurion Liquid-cooled 15 kW and 25 kW Generators  
Section 3 OPERATION..........................13  
Introduction................................Inside Front Cover  
Read This Manual Thoroughly ............................IFC  
Operation and Maintenance ................................IFC  
How to Obtain Service..........................................IFC  
Authorized Dealer Locator Number ........................IFC  
Safety Rules................................................................2  
Section 1 – General Information ..........................4  
1.1 Generator..........................................................4  
1.2 Transfer Switch ................................................4  
3.1 Using a Standard “GTS” Transfer Switch........13  
3.2 Control Console Components..........................13  
3.2.1 Hourmeter ..........................................13  
3.2.2 Auto/Off/Manual Switch ......................13  
3.2.3 Fault Indicator Lamp ..........................13  
3.2.4 15 Amp Fuse ......................................13  
3.2.5 7.5 Amp Inline Fuse............................14  
3.2.6 Set Exercise Time Switch....................14  
3.3 Manual Transfer and Start-up ........................14  
3.4 Automatic Operation ......................................14  
3.5 Weekly Exercise Cycle......................................14  
3.6 Engine Block Heater........................................14  
1.3 Automatic System Operation ............................4  
1.4 Generator AC Connection Systems....................4  
1.5 Main Circuit Breaker ........................................5  
1.6 Generator Fuel System ......................................5  
1.7 Engine Protective Devices..................................5  
1.7.1 Low Oil Pressure Switch ......................5  
1.7.2 High Coolant Temperature Switch ........5  
1.7.3 Low Coolant Level Switch ....................6  
1.7.4 Overspeed Shutdown............................6  
1.7.5 PCB Operation LED’s............................6  
1.7.6 Overcrank Shutdown............................6  
1.8 Unpacking ........................................................6  
1.8.1 Unpacking Precautions ........................6  
1.8.2 Inspection ............................................6  
1.9 Lifting the Generator ........................................6  
1.10 Specifications ....................................................7  
1.10.1 Generator..............................................7  
1.10.2 Engine ..................................................7  
1.11 Fuel Consumption ............................................7  
1.12 Reconfiguring the Fuel System ..........................7  
1.13 Torque Specifications ........................................8  
1.14 Engine Oil Recommendations............................8  
1.15 Coolant Recommendations................................8  
1.16 Before Installation ............................................8  
Section 4 — MAINTENANCE ....................15  
4.1 Maintenance Performed by  
Authorized Service Facilities............................15  
4.2 Cooling System................................................15  
4.3 Overload Protection for Engine  
DC Electrical System ......................................15  
4.4 Checking Fluid Levels ....................................15  
4.4.1 Check Engine Oil ................................15  
4.4.2 Battery Fluid ......................................16  
4.4.3 Engine Coolant....................................16  
4.5 Maintenance Owner/Operator Can Perform ....16  
4.5.1 Check Engine Oil Level ......................16  
4.5.2 Check Battery ....................................16  
4.5.3 Exercise System..................................16  
4.5.4 Inspect Cooling System ......................16  
4.5.5 Perform Visual Inspection ..................16  
4.5.6 Inspect Exhaust System......................16  
4.5.7 Check Fan Belt....................................16  
4.5.8 Inspect Engine Governor ....................16  
4.5.9 Changing Engine Oil ..........................16  
4.5.10 Changing the Engine Air Cleaner ........17  
4.5.11 Spark Plugs ........................................17  
4.5.12 Coolant Change ..................................17  
4.6 Miscellaneous Maintenance ............................17  
4.6.1 Cleaning the Generator ......................17  
4.6.2 Battery ................................................18  
4.6.3 Battery Maintenance ..........................18  
4.6.4 Battery Replacement ..........................18  
4.6.5 Rodent Protection ..............................18  
4.7 Out of Service Procedure ................................19  
4.7.1 Removal From Service ........................19  
4.7.2 Return to Service ................................19  
4.8 Fuel Pipe Sizing ..............................................19  
4.9 Scheduled Maintenance ..................................20  
Section 2 — INSTALLATION ......................8  
2.1 Generator Installation ......................................8  
2.1.1 NFPA Standards....................................9  
2.1.2 Other Published Standards ..................9  
2.2 Generator Location............................................9  
2.3 Generator Mounting and Support ....................9  
2.4 Basic Standby Electric System..........................9  
2.5 Emergency Circuit Isolation Method................10  
2.6 Total Circuit Isolation Method ........................10  
2.7 Grounding the Generator ................................10  
2.8 Generator AC Neutral Connections..................11  
2.9 Transfer Switch Start Signal Connections ......11  
2.10 Battery Installation..........................................11  
2.10.1 Vented Batteries..................................11  
2.11 Preparation Before Start-Up ............................12  
2.11.1 Prior to Initial Start-up ......................12  
2.11.2 Transfer Switch ..................................12  
2.11.3 Fuel System ........................................12  
2.11.4 Generator Set Lubrication ..................12  
2.11.5 Engine Coolant....................................12  
2.11.6 Belt Tension........................................12  
2.11.7 Electrical System ................................12  
Section 5 — TROUBLESHOOTING ..........23  
5.1 Troubleshooting Points....................................23  
Section 6 — NOTES..................................24  
Section 7 — INSTALLATION DIAGRAM....25  
Section 8 — ELECTRICAL DATA..............26  
Section 9 — EXPLODED VIEWS AND  
PARTS LISTS ......................30  
Section 10 — WARRANTY .......................48  
®
Generac Power Systems, Inc.  
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IMPORTANT SAFETY INSTRUCTIONS  
Guardian Liquid-cooled 15 kW, 20 kW and 25 kW Generators  
SAVE THESE INSTRUCTIONS – The manufacturer suggests that these rules for safe  
operation be copied and posted in potential hazard areas. Safety should be stressed to all  
operators, potential operators, and service and repair technicians for this equipment.  
!
!
!
SAVE THESE INSTRUCTIONS – This manual contains important instructions that should be  
followed during installation and maintenance of the generator and batteries.  
!
!
!
!
!
GENERAL HAZARDS  
WARNING:  
The engine exhaust from this product  
contains chemicals known to the state  
of California to cause cancer, birth  
defects or other reproductive harm.  
For safety reasons, Generac recommends that this  
equipment be installed, serviced and repaired by a  
Generac Authorized Service Dealer or other  
competent, qualified electrician or installation  
technician who is familiar with applicable codes,  
standards and regulations. The operator also must  
comply with all such codes, standards and regulations.  
• Installation, operation, servicing and repair of this  
(and related) equipment must always comply with  
applicable codes, standards, laws and regulations.  
Adhere strictly to local, state and national electrical  
and building codes. Comply with regulations the  
Occupational Safety and Health Administration  
(OSHA) has established. Also, ensure that the  
generator is installed, operated and serviced in  
accordance with the manufacturer’s instructions and  
recommendations. Following installation, do nothing  
that might render the unit unsafe or in  
noncompliance with the aforementioned codes,  
standards, laws and regulations.  
• The engine exhaust fumes contain carbon monoxide  
gas, which can be DEADLY. This dangerous gas, if  
breathed in sufficient concentrations, can cause  
unconsciousness or even death. For that reason,  
adequate ventilation must be provided. Exhaust  
gases must be piped safely away from any building  
near the generator to an area where people, animals,  
etc., will not be harmed. This exhaust system is  
designed to comply with applicable codes and  
standards.  
• Keep hands, feet, clothing, etc., away from drive belts,  
fans, and other moving or hot parts. Never remove  
any drive belt or fan guard while the unit is operating.  
• Adequate, unobstructed flow of cooling and  
ventilating air is critical to prevent buildup of  
explosive gases and to ensure correct generator  
operation. Do not alter the installation or permit even  
partial blockage of ventilation provisions, as this can  
seriously affect safe operation of the generator.  
• Keep the area around the generator clean and  
uncluttered. Remove any materials that could  
become hazardous.  
!
!
WARNING:  
This product contains or emits chemicals  
known to the state of California to cause  
cancer, birth defects or other reproductive harm.  
Study these SAFETY RULES carefully before installing,  
operating or servicing this equipment. Become familiar  
with this Owner’s Manual and with the unit. The  
generator can operate safely, efficiently and reliably only if  
it is properly installed, operated and maintained. Many  
accidents are caused by failing to follow simple and  
fundamental rules or precautions.  
Generac cannot possibly anticipate every possible  
circumstance that might involve a hazard. The warning  
in this manual, and on tags and decals affixed to the  
unit are, therefore, not all-inclusive. If using a  
procedure, work method or operating technique that  
Generac does not specifically recommend, satisfy  
yourself that it is safe for others. Also make sure the  
procedure, work method or operating technique chosen  
does not render the generator unsafe.  
DANGER  
Despite the safe design of this generator,  
!
operating this equipment imprudently, neglecting  
its maintenance or being careless can cause  
possible injury or death. Permit only responsible  
and capable persons to install, operate or  
maintain this equipment.  
Potentially lethal voltages are generated by these  
machines. Ensure all steps are taken to render the  
machine safe before attempting to work on the  
generator.  
Parts of the generator are rotating and/or hot  
during operation. Exercise care near running  
!
generators.  
• When working on this equipment, remain alert at all  
times. Never work on the equipment when physically  
or mentally fatigued.  
• Inspect the generator regularly, and promptly repair  
or replace all worn, damaged or defective parts using  
only factory-approved parts.  
®
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Generac Power Systems, Inc.  
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Important Safety Instructions  
Centurion Liquid-cooled 15 kW and 25 kW Generators  
• Before performing any maintenance on the generator, Generators installed with an automatic transfer  
disconnect its battery cables to prevent accidental  
start-up. Disconnect the cable from the battery post  
indicated by a NEGATIVE, NEG or (–) first.  
Reconnect that cable last.  
switch will crank and start automatically when  
normal (UTILITY) source voltage is removed or is  
below an acceptable preset level. To prevent such  
automatic start-up and possible injury to personnel,  
disable the generator’s automatic start circuit  
(battery cables, etc.) before working on or around the  
unit. Then, place a “Do Not Operate” tag on the  
generator control panel and on the transfer switch.  
• In case of accident caused by electric shock,  
immediately shut down the source of electrical power.  
If this is not possible, attempt to free the victim from  
the live conductor. AVOID DIRECT CONTACT WITH  
THE VICTIM. Use a nonconducting implement, such  
as a dry rope or board, to free the victim from the live  
conductor. If the victim is unconscious, apply first aid  
and get immediate medical help.  
• Never use the generator or any of its parts as a step.  
Stepping on the unit can stress and break parts, and  
may result in dangerous operating conditions from  
leaking exhaust gases, fuel leakage, oil leakage, etc.  
ELECTRICAL HAZARDS  
• All generators covered by this manual produce  
dangerous electrical voltages and can cause fatal  
electrical shock. Utility power delivers extremely high  
and dangerous voltages to the transfer switch as well  
as the standby generator. Avoid contact with bare  
wires, terminals, connections, etc., on the generator  
as well as the transfer switch, if applicable. Ensure  
all appropriate covers, guards and barriers are in  
place before operating the generator. If work must be  
done around an operating unit, stand on an  
insulated, dry surface to reduce shock hazard.  
• Do not handle any kind of electrical device while  
standing in water, while barefoot, or while hands or  
feet are wet. DANGEROUS ELECTRICAL SHOCK  
MAY RESULT.  
• Never wear jewelry when working on this equipment.  
Jewelry can conduct electricity resulting in electric  
shock, or may get caught in moving components  
causing injury.  
FIRE HAZARDS  
• Keep a fire extinguisher near the generator at all  
times. Do NOT use any carbon tetra-chloride type  
extinguisher. Its fumes are toxic, and the liquid can  
deteriorate wiring insulation. Keep the extinguisher  
properly charged and be familiar with its use.  
Consult the local fire department for any questions  
pertaining to fire extinguishers.  
• If people must stand on metal or concrete while  
installing, operating, servicing, adjusting or repairing  
this equipment, place insulative mats over a dry  
wooden platform. Work on the equipment only while  
standing on such insulative mats.  
• The National Electrical Code (NEC), Article 250  
requires the frame and external electrically  
conductive parts of the generator to be connected to  
an approved earth ground and/or grounding rods.  
This grounding will help prevent dangerous electrical  
shock that might be caused by a ground fault  
condition in the generator set or by static electricity.  
Never disconnect the ground wire.  
• Wire gauge sizes of electrical wiring, cables and cord  
sets must be adequate to handle the maximum  
electrical current (ampacity) to which they will be  
subjected.  
• Before installing or servicing this (and related)  
equipment, make sure that all power voltage supplies  
are positively turned off at their source. Failure to do  
so will result in hazardous and possibly fatal  
electrical shock.  
• Connecting this unit to an electrical system normally  
supplied by an electric utility shall be by means of a  
transfer switch so as to isolate the generator electric  
system from the electric utility distribution system  
when the generator is operating. Failure to isolate the  
two electric system power sources from each other by  
such means will result in damage to the generator  
and may also result in injury or death to utility power  
workers due to backfeed of electrical energy.  
EXPLOSION HAZARDS  
• Provide adequate ventilation around the generator to  
prevent build-up of explosive gas.  
• Do not smoke around the generator. Wipe up any fuel  
or oil spills immediately. Ensure that no combustible  
materials are left in the generator compartment, or  
on or near the generator, as FIRE or EXPLOSION  
may result. Keep the area surrounding the generator  
clean and free from debris.  
• Generac generator sets may operate using one of  
several types of fuels. All fuel types are potentially  
FLAMMABLE and/or EXPLOSIVE and should be  
handled with care. Comply with all laws regulating  
the storage and handling of fuels. Inspect the unit’s  
fuel system frequently and correct any leaks  
immediately. Fuel supply lines must be properly  
installed, purged and leak tested according to  
applicable fuel-gas codes before placing this  
equipment into service.  
• Gases such as natural gas and liquid propane (LP)  
gas are extremely EXPLOSIVE. Natural gas is lighter  
than air, and LP gas is heavier than air; install leak  
detectors accordingly.  
®
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Section 1 - General Information  
Centurion Liquid-cooled 15 kW and 25 kW Generators  
1.1 GENERATOR  
1.3 AUTOMATIC SYSTEM OPERATION  
When this generator, along with its transfer switch,  
has been installed and interconnected, a circuit  
board in the generator panel constantly monitors  
utility power source voltage. Should that voltage drop  
below a preset value, and remain at such a low state  
for a preset amount of time, the generator cranks and  
starts. After the generator starts, the transfer switch  
transfers load circuits so the generator can power  
them.  
This equipment is a liquid-cooled, engine-driven  
generator set. The generator is designed to supply  
electrical power that operates critical electrical loads  
during utility power failure. The unit has been  
factory-installed in a weather resistant, all metal  
enclosure and is intended for outdoor installation  
only. Use this generator as a source of electrical  
power for the operation of 120 and/or 240VAC,  
single-phase loads.  
These models are available. They are rated as  
follows:  
When utility source voltage has been restored, the  
switch re-transfers back to the utility source voltage  
and the generator then shuts down.  
Model 004912 : Provides 15,000 watts (15 kW) of single-phase  
power.  
Please reference the transfer switch manual for  
specific information.  
Model 004913: Provides 25,000 watts (25 kW) of single-phase  
power.  
1.4 GENERATOR AC CONNECTION  
SYSTEMS  
The generator was shipped from the factory with its  
stator AC output leads connected in a single-phase,  
three-wire generator AC connection system (Figure  
1.1). The stator assembly in this system consists of a  
pair of stationary windings, with two leads brought  
out of each winding. Each single winding can supply  
120VAC, 60 Hertz. When the two windings are  
connected in series, a 240VAC, 60 Hertz output  
results. Typically the two “hot” leads in the circuit are  
Wires No. 11 and 44. The “Neutral” leads are the  
junction of Wires 22 and 33.  
If this generator is used to power electrical  
load circuits normally powered by a utility  
power source, it is required by code to install  
a transfer switch. The transfer switch must  
effectively isolate the electric system from the  
utility distribution system when the generator  
is operating (NEC 701). Failure to isolate an  
electrical system by such means results in  
damage to the generator and may also result  
in injury or even death to utility power  
!
workers due to backfeed of electrical energy.  
Figure 1.1 - Generator AC Connection System  
1.2 TRANSFER SWITCH  
This generator system includes a matched automatic  
transfer switch which is intended to be used in  
conjunction with the Centurion generator. It is  
supplied in a NEMA 3R enclosure. The NEMA 3R  
enclosure is weather resistant and can be used  
indoors or outdoors. Follow these rules:  
• Install the transfer switch on a firm, sturdy  
supporting structure.  
To prevent switch distortion, level the switch if  
necessary. This can be done by placing washers  
between the switch enclosure and the mounting  
surface.  
• Never install the switch where water or any  
corrosive substance might drip onto the enclosure.  
• Protect the switch at all times against excessive  
moisture, dust, dirt, lint, construction grit and  
corrosive vapors.  
NOTE:  
Rated power of generator is subject to and limited  
by such factors as ambient temperature, altitude,  
engine condition, and other factors. Engine power  
will decrease about 3% for each 1000 feet above  
3000 feet and will decrease an additional 1.5% for  
each 10°F above 77°F. Maximum output power of  
the generator is limited by maximum engine  
power.  
• It is highly recommended to utilize  
a
Generac/Centurion transfer switch with this  
generator or it may void the warranty.  
®
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Section 1 - General Information  
Centurion Liquid-cooled 15 kW and 25 kW Generators  
Figure 1.2 - Main Circuit Breaker  
Model  
04912  
04913  
Rating  
15,000  
25,000  
Phase  
Actual Current  
62.5  
C/B Rating*  
Circuit Breaker  
70A BQ2  
1
1
70  
104.2  
125  
125A BQ2  
* Amp Rating of CB structured under model.  
Figure 1.3 - Engine Protective Devices  
1.5 MAIN CIRCUIT BREAKER  
The generator’s main circuit breaker is included with  
the unit. The breaker for each unit is described in  
Figure 1.2.  
1.6 GENERATOR FUEL SYSTEM  
The generator has been factory tested and adjusted  
using a natural gas fuel system. If propane (LP  
requirements) gas is preferred, contact an authorized  
service dealer. Refer to Secion 1.12.  
Recommended fuels should have a Btu content of at  
least 1,000 Btus per cubic foot for natural gas; or at  
least 2,520 Btus per cubic foot for LP gas. Ask the  
fuel supplier for the Btu content of the fuel being  
used.  
Fuel pressure for a natural gas set up should be five  
inches to 14 inches of water column (0.18 to 0.5  
psi) at all load ranges.  
1.7.1 LOW OIL PRESSURE SWITCH  
Fuel pressure for an LP vapor set up should be 11  
inches to 14 inches of water column (0.4 to 0.5  
psi) at all load ranges.  
This switch is normally-closed (N.C.) but is held open  
by engine oil pressure during engine running. Should  
operating oil pressure drop below about 10 psi (68  
kPa), the switch contacts close and the engine shuts  
down automatically (Figure 1.4).  
NOTE:  
A seperate gas line and regulator may be needed  
to assure proper gas pressure to the generator.  
Improper gas pressure can cause hard starting and  
affect engine durability.  
Figure 1.4 - Low Oil Pressure Switch  
Gaseous fuels such as natural and LP  
(propane) gas are highly explosive. Even the  
slightest spark can ignite such fuels and cause  
!
an explosion. No leakage of fuel is permitted.  
Natural gas, which is lighter than air, tends to  
collect in high areas. LP gas is heavier than air  
and tends to settle in low areas.  
1.7 ENGINE PROTECTIVE DEVICES  
The engine has several safety switches which cause  
the engine to automatically shut down under the  
following conditions: low oil pressure, high coolant  
temperature, engine overspeed, low coolant level or  
overcrank (Figure 1.3).  
1.7.2 HIGH COOLANT TEMPERATURE  
SWITCH  
This normally open (N.O.), thermostatic switch has  
sensing tip which is immersed in captive coolant.  
Should coolant temperature exceed about 250°F  
(121°C), the switch contacts close, which causes the  
engine to shut down automatically (Figure 1.5).  
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Section 1 — General Information  
Centurion Liquid-cooled 15 kW and 25 kW Generators  
Figure 1.5- High Coolant Temperature Switch  
1.7.5 PCB OPERATION LED’S  
• LED 1 is RED. The LED will be on when utility  
sensing is NOT available to the circuit board. This  
LED will function only when the AUTO/OFF/  
MANUAL switch is set in the Auto position.  
• LED 2 is YELLOW. This LED will be on when the  
circuit board battery charger is on. This LED will  
cycle on and off with the battery charger, 4.85  
hours on the 4.85 hours off.  
• LED 3 is GREEN. This LED will flash when the  
circuit board has load voltage available to it. This  
LED will function when voltage is available across  
T1 and T2.  
1.7.3 LOW COOLANT LEVEL SWITCH  
Should engine coolant level drop below the level of  
the high coolant temperature switch, it is possible for  
the engine to overheat without automatic shutdown.  
To prevent such overheating without automatic shut  
down, the engine has a low coolant level sensor. If the  
engine coolant drops too low, the engine  
automatically shuts down (Figure 1.6).  
1.7.6 OVERCRANK SHUTDOWN  
After 90 seconds of crank-rest cycles, this function  
ends cranking if the engine fails to start in that 90  
second span.  
1.7.6 DC FUSE  
This clearly labeled fuse is located on the front panel  
of the control system. It protects the panel wiring and  
components from damaging overload. Always  
remove this fuse before commencing work on the  
generator. The unit will not start or crank if the fuse  
is blown. Replace the fuse with one of the same size,  
type, and rating. Generac normally uses an AGC fuse  
rated at 15 amps (part number 022676).  
Figure 1.6 - Low Coolant Level Sensor  
1.8 UNPACKING  
1.8.1 UNPACKING PRECAUTIONS  
1.7.4 OVERSPEED SHUTDOWN  
Handle shipping cartons and crates with care. Use  
care to avoid damage from dropping, bumping,  
collision, etc. Store and unpack cartons with the  
proper side up, as noted on the shipping carton.  
The Pre-pack circuit board on liquid cooled units  
receives AC frequency (rpm) signals directly from the  
stator AC power windings, via sensing leads S15 and  
S16. Should AC frequency exceed about 72 Hz,  
circuit board action will automatically shutdown the  
engine (Figure 1.7).  
1.8.2 INSPECTION  
After unpacking, carefully inspect the generator for  
any damage that may have occurred during  
shipment. If loss or damage is noted at the time of  
delivery, have the person(s) making delivery note all  
damage on the freight bill or affix their signature  
under the consignor’s memo of loss or damage.  
Figure 1.7 - Control Module Assembly  
Circuit Board  
PRE-PACKAGED STANDBY  
J2  
U13  
U14  
U17  
U15  
E
M14  
A
M15  
C17  
C18  
C12  
M3  
M8  
M1  
Q7  
C1  
R1  
U1  
Q14  
M10  
R68 R60  
C24  
C21  
C25  
C22  
U5  
U4  
LED3  
U16  
SW1  
BR1  
U12  
C3  
R56  
CR1  
Q9  
C2  
1.9 LIFTING THE GENERATOR  
C5  
C
U2  
R12  
C4  
Q1  
U6  
U18  
U3  
R11 R10 CR7  
U19  
U7  
CR37  
K4  
When lifting or hoisting equipment is used,  
be careful not to touch overhead power lines.  
The generators weight of more than 900  
pounds requires proper tools, equipment, and  
qualified personnel to be used in all phases of  
handling and unpacking.  
Q4  
K2  
K3  
C19  
U9  
Q5  
Q3  
Q12  
Q11  
U10  
U8  
C23  
Q2  
C20  
!
C8  
C15  
Q15  
C10  
C9  
C11  
LED2  
U20  
Q16  
C7  
C14  
C16  
K1  
LED1  
M9  
Q6  
Q13  
M4  
M2  
C13  
R55  
CUT R83  
FOR 50HZ  
CR41  
2002 GENERAC POWER SYSTEMS, ASSY #076009A  
®
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Section 1 — General Information  
Centurion Liquid-cooled 15 kW and 25 kW Generators  
Fuel pressure for a natural gas set up should be five  
1.10 SPECIFICATIONS  
inches to 14 inches of water column (0.18 to 0.5  
psi) at all load ranges.  
1.10.1 GENERATOR  
Fuel pressure for an LP vapor set up should be 11  
inches to 14 inches of water column (0.4 to 0.5  
psi) at all load ranges.  
Single-Phase  
Model  
004913  
004912  
15  
NOTE:  
Rated Max. Cont.  
AC Power Output (kW)  
Rated voltage (volts)  
No. of Rotor Poles  
Driven Speed of Rotor  
25  
A seperate gas line and regulator may be needed  
to assure proper gas pressure to the generator.  
Improper gas pressure can cause hard starting and  
could affect engine durability.  
120/240  
2
4
3600  
1800  
Rotor Excitation System Direct excited brush type  
1.12 RECONFIGURING THE FUEL  
Type of Stator  
Rotor/Stator Insulation  
4 Wire  
Class F/H  
SYSTEM  
NOTE:  
1.10.2 ENGINE  
All models are configured for natural gas from the  
factory.  
Make ................................................................Mitsubishi  
Displacement ..................................92 inches3 (1.5 liters)  
Cylinder Arrangement ........................................4, in-line  
Valve Arrangement ....................................Overhead Cam  
Firing Order ..........................................................1-3-4-2  
Number of Main Bearings ..............................................5  
Compression Ratio ..................................................9 to 1  
No. of Teeth on Flywheel ............................................104  
Ignition Timing  
at 1800 rpm ........................................35 degrees BTDC  
at 3600 rpm ........................................43 degrees BTDC  
Spark Plug Gap......................................0.020-0.025 inch  
Recommended Spark Plugs  
To reconfigure the fuel system from NG to LP, follow  
these steps:  
1. Turn the main gas supply off.  
2. Remove the carburetor fuel hose from the outlet  
port (Port 1) of the demand regulator (Figure  
1.8).  
3. Remove the brass hose fitting from the outlet port  
(Port 1) of the demand regulator.  
4. Remove pipe plug from Port 2.  
5. Install brass hose fitting into Port 2.  
6. Install pipe plug into Port 1.  
Champion ..........................................................RN11YC4  
Oil Pressure........................................................30-50 psi  
Crankcase Oil Capacity ............4.0 U.S. quarts (3.8 liters)  
Recommended Engine Oil ............................SAE 15W-40  
Type of Cooling System ........Pressurized, closed recovery  
Cooling Fan....................................................Pusher Type  
Cooling System Capacity ............2 U.S. gallons (7.6 liters)  
7. Connect carburetor gas hose to brass fitting.  
8. Tighten all clamps and plugs.  
9. Make sure fuel supply is of the proper pressure  
and type for configuration.  
10. Reverse the procedure to convert back to natural  
gas.  
Figure 1.8 — Reconfigure the Fuel System  
Recommended Coolant ................Use a 50-50 mixture of  
ethylene glycol base and  
Port 1  
Port 2  
deionized water.  
FUEL HOSE  
FUEL HOSE  
BRASS HOSE  
FITTING  
BRASS HOSE  
FITTING  
PLUG  
PLUG  
1.11 FUEL CONSUMPTION  
25 kW Models  
Using Natural Gas..............................441 cu. ft. per hour  
Using LP Gas ....................175 cubic ft.(4.8 gal.) per hour  
15 kW Models  
OUT  
PORT 1  
OUT  
PORT 2  
HOUSING  
PORTS  
HOUSING  
PORTS  
Using Natural Gas..............................277 cu. ft. per hour  
Using LP Gas ....................110 cubic ft.(3.1 gal.) per hour  
NOTE:  
Fuel consumption is given at rated maximum  
continuous power output when using natural gas  
rated at 1000 Btu per cubic foot; or LP gas rated  
2520 Btu per cubic foot. Actual fuel consumption  
obtained may vary depending on such variables as  
applied load, ambient temperature, engine  
conditions and other environmental factors.  
NG FUEL SYSTEM  
LP FUEL SYSTEM  
NOTE:  
Port 1 is for NG only and Port 2 is for LP vapor  
only. No provision for simultaneous fuels has been  
made.  
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Section 2 — Installation  
Centurion Liquid-cooled 15 kW and 25 kW Generators  
1.16 BEFORE INSTALLATION  
DANGER  
Before installing this equipment, check the ratings of  
both the generator and the transfer switch. Read  
“Emergency Isolation Method” and “Total Circuit  
Isolation Method” in the installation manual (Part No.  
079699).  
Serious injury or damage may occur if not  
configured properly. Please consult an  
authorized Generac Service Dealer with any  
questions.  
!
The generator’s rated wattage/amperage capacity  
must be adequate to handle all electrical loads that  
the unit will power. You may have to group the critical  
(essential) loads together and wire them into a  
separate “emergency” distribution panel.  
1.13 TORQUE SPECIFICATIONS  
Cylinder Head ................................15 (+ 90° + 90°) ft.lb.  
Intake Manifold ....................................................13 ft.lb.  
Exhaust Manifold..................................................13 ft.lb.  
This generator can be installed in conjunction with a  
Generac “GTS” type engineered transfer switch, if  
desired.  
1.14 ENGINE OIL RECOMMENDATIONS  
The unit has been filled with 15W-40 engine oil at the  
factory. Use a high-quality detergent oil classified “For  
Service CC, SD, SE, SF.” Detergent oils keep the  
engine cleaner and reduce carbon deposits. Use oil  
having the following SAE viscosity rating, based on  
the ambient temperature range anticipated before the  
next oil change:  
The standard transfer switch included has no  
adjustable sensing or controlling circuit boards.  
Instead, the generator control console houses a  
“Printed Circuit Board Assembly”, which controls all  
phases of operation, including engine start up and  
load transfer.  
Temperature  
Above 80° F (27° C)  
32° to 80° F (-1° to 27° C)  
Below 32° F (0° C)  
Oil Grade (Recommended)  
SAE 30W or 15W-40  
SAE 20W-20 or 15W-40  
SAE 10W or 15W-40  
2.1 GENERATOR INSTALLATION  
DANGER  
Connecting this generator to an electrical  
system normally supplied by an electric utility  
shall be by means of a transfer switch, so as  
to isolate the electric system from the utility  
distribution system when the generator is  
operating. Failure to isolate the electric  
system by these means will result in damage  
to the generator and may also result in injury  
or death to utility workers due to backfeed of  
electrical energy.  
Any attempt to crank or start the engine  
before it has been properly serviced with the  
recommended oil may result in an engine  
failure.  
!
1.15 COOLANT RECOMMENDATIONS  
Use a mixture of half low silicate ethylene glycol base  
anti-freeze and deionized water. Cooling system  
capacity is about 8 U.S. quarts (7.6 liters). Use only  
deionized water and only low silicate anti-freeze. If  
desired, add a high quality rust inhibitor to the  
recommended coolant mixture. When adding  
coolant, always add the recommended 50-50  
mixture.  
If an open bottom is used, the generator is to  
be installed over non-combustible materials  
and should be located such that combustible  
materials are not capable of accumulating  
under the generator set.  
Only qualified, competent installation contractors or  
electricians thoroughly familiar with applicable  
codes, standards and regulations should install this  
standby electric power system. The installation must  
comply strictly with all codes, standards and  
regulations pertaining to the installation.  
Do not use any chromate base rust inhibitor  
with ethylene glycol base anti-freeze or  
chromiumhydroxide (“green slime”) forms and  
!
This genset must be installed on a level surface. The  
base frame must be level within two (2) inches all  
around.  
will cause overheating. Engines that have  
been operated with a chromate base rust  
inhibitor must be chemically cleaned before  
adding ethylene glycol base anti-freeze. Using  
any high silicate anti-freeze boosters or  
additives will also cause overheating. Generac  
also recommends that any soluble oil inhibitor  
is NOT used for this equipment.  
After the system has been installed, do nothing  
that might render the installation in  
noncompliance with such codes, standards and  
regulations.  
!
®
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Section 2 — Installation  
Centurion Liquid-cooled 15 kW and 25 kW Generators  
NOTE:  
2.2 GENERATOR LOCATION  
For more information about the installation of a  
standby system, you can order Engine-Generator  
Standby Electric Power Systems Installer’s Guide  
and Reference Manual (part #046622) from a  
Generac Authorized Service Dealer.  
Install the generator set, in its protective enclosure  
outdoors, where adequate cooling and ventilating air  
is always is available. Consider these factors:  
• Install the unit where air inlet and outlet openings  
will not become obstructed by leaves, grass, snow,  
etc. If prevailing winds will cause blowing or  
drifting, consider a windbreak to protect the unit.  
• Install the generator on high ground where water  
levels will not rise and endanger it.  
• Allow sufficient room on all sides of the generator  
for maintenance and servicing. Allow three feet of  
space on all sides. NOTE: LOCAL LAWS OR  
CODES MAY REQUIRE DIFFERENT OFFSET  
DISTANCES.  
2.1.1 NFPA STANDARDS  
The following published standards booklets  
pertaining to standby electric systems are available  
form the National Fire Protection Association (NFPA),  
Batterymarch Park, Quincy, MA 02269:  
• NFPA No. 37, STATIONARY COMBUSTION  
ENGINES AND GAS TURBINES.  
• NFPA No. 76A, ESSENTIAL ELECTRICAL  
SYSTEMS FOR HEALTH CARE FACILITIES.  
• NFPA No. 220, STANDARD TYPES OF BUILDING  
CONSTRUCTION  
• Where strong prevailing winds blow from one  
direction, face the generator air inlet openings into  
the prevailing winds.  
• NFPA No. 68, GUIDE FOR EXPLOSION VENTING  
• NFPA No. 70, NATIONAL ELECTRICAL CODE.  
• NFPA No. 30, FLAMMABLE AND COMBUSTIBLE  
LIQUIDS CODE.  
• Install the generator as close as possible to the  
transfer switch. This reduces the length of wiring  
and conduit.  
• Install the generator as close as possible to the fuel  
supply, to reduce the length of piping. HOWEVER,  
REMEMBER THAT LAWS OR CODES MAY  
REGULATE THE DISTANCE.  
• NFPA No. 10, INSTALLATION, MAINTENANCE  
AND USE OF PORTABLE FIRE EXTINGUISHERS.  
2.1.2 OTHER PUBLISHED STANDARDS  
2.3 GENERATOR MOUNTING AND  
In addition to NFPA standards, the following  
information pertaining to the installation and use of  
standby electric systems is available:  
SUPPORT  
Retain the generator compartment to a steel mesh or  
rebar reinforced concrete slab with 1/4-inch masonry  
type anchor bolts. Be sure the bolts are long enough  
to retain the compartment. The slab should be at  
least five inches thick and should extend beyond the  
enclosure to a distance of at least three inches on all  
sides. See page 25 for generator major dimensions.  
• Article X, NATIONAL BUILDING CODE, available  
from the American Insurance Association, 85 John  
Street, New York, N.Y. 10038.  
• AGRICULTURAL WIRING HANDBOOK, obtainable  
from the Food and Energy Council, 909 University  
Avenue, Columbia, MO, 65201.  
• ASAE  
EP-364.2,  
INSTALLATION  
AND  
MAINTENANCE OF FARM STANDBY ELECTRIC  
POWER, available from the American Society of  
Agricultural Engineers, 2950 Niles Road, St.  
Joseph, MI 49085.  
2.4 BASIC STANDBY ELECTRIC  
SYSTEM  
Figure 2.1 shows a schematic diagram of a basic  
standby electric system. Both the UTILITY power  
supply and the STANDBY (GENERATOR) output are  
connected to an approved transfer switch. The  
transfer switch is required by electrical code and  
serves the following functions:  
• A52.1, AMERICAN NATIONAL STANDARD FOR  
CHIMNEYS, FIREPLACES AND VENTING  
SYSTEMS, available from the American National  
Standard Institute, 1430 Broadway, New York, N.Y.  
10018.  
• Permits the LOAD circuits to be connected to only  
one power supply at a time.  
• Prevents electrical backfeed between the generator  
and the UTILITY power circuits.  
Notice that both the STANDBY and the UTILITY  
power supplies to the transfer switch are protected  
against overload by a main line circuit breaker.  
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Section 2 — Installation  
Centurion Liquid-cooled 15 kW and 25 kW Generators  
Figure 2.1 – Basic Standby Electric System  
2.6 TOTAL CIRCUIT ISOLATION  
METHOD  
When a generator capable of powering all electrical  
loads in the circuit is to be installed, use the “Total  
Circuit Isolation Method.” It is possible for the  
generator to be overloaded when this isolation  
method is employed. The following apply to the  
transfer switch in this type of system.  
• Ampere rating of the transfer switch must be equal  
to, or greater than, the ampere rating of the normal  
incoming utility service.  
• The transfer switch is installed between the utility  
service entrance and the building distribution  
panel.  
2.7 GROUNDING THE GENERATOR  
The National Electrical Code requires the frame and  
external electrically conductive parts of this  
equipment to be properly connected to an approved  
earth ground and/or grounding rods. For that  
purpose, a GROUND LUG (Figure 2.2) is provided on  
the generator mounting base. Consult a qualified  
electrician for grounding requirements in the area.  
Grounding procedures must meet local regulations.  
NOTE:  
Generac recommends the use of a Generac Power  
Systems transfer switch in conjunction with this  
generator.  
2.5 EMERGENCY CIRCUIT ISOLATION  
METHOD  
DANGER  
This prevents overloading the generator by keeping  
electrical loads below the wattage/amperage capacity  
of the generator. If the generator is powering only  
critical loads, within the wattage/amperage capacity,  
during utility power outages, consider using the  
emergency circuit isolation method.  
Do not connect the ground wire to any pipe  
that carries a flammable or explosive substance  
– FIRE or an EXPLOSION may result.  
Proper grounding helps protect personnel against  
electrical shock in the event of a ground fault  
condition in the generator or in connected electrical  
devices. In addition, grounding helps dissipate static  
electricity that often builds up in ungrounded  
devices.  
Critical electrical loads are grouped together and  
wired into a separate “Emergency Distribution  
Panel.” Load circuits powered by that panel are  
within the wattage/amperage capacity of the generator  
set. When this method is used, it is difficult to  
overload the generator. The transfer switch must  
meet the following requirements:  
Figure 2.2 – Generator Grounding Lug (typical)  
• It must have an ampere rating equal to, or greater  
than, the total amperage rating of the emergency  
distribution panel circuit.  
• Have it installed between the building’s main  
distribution panel and the emergency distribution  
panel.  
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Section 2 — Installation  
Centurion Liquid-cooled 15 kW and 25 kW Generators  
2.8 GENERATOR AC NEUTRAL  
CONNECTIONS  
Do not dispose of the battery in a fire. The  
battery is capable of exploding.  
Generac uses an UNGROUNDED AC neutral.  
Grounding is recommended only at the main service  
entrance. If the neutral wire is grounded and one of  
the phase loads becomes grounded, the excessive  
current opens the load circuit breaker or collapses  
the generator field. The actual result depends on the  
electrical characteristics of the particular installed  
generator.  
Do not open or mutilate the battery. Released  
electrolyte can be toxic and harmful to the skin  
and eyes.  
!
The battery represents a risk of high short  
circuit current. When working on the battery,  
always remove watches, rings or other metal  
objects, and only use tools that have insulated  
handles.  
2.9 TRANSFER SWITCH START SIGNAL  
CONNECTIONS  
2.10.1 VENTED BATTERIES  
If the generator is to be installed with an automatic  
transfer switch, such as a Generac GTS-type switch,  
it will be necessary to connect the two-wire start  
control system.  
The electrolyte is a dilute sulfuric acid that is  
harmful to the skin and eyes. It is electrically  
conductive and corrosive. The following  
procedures are to be observed:  
!
Connect the two-wire start signal from the automatic  
transfer switch to the automatic start connection,  
which is located in the right hand corner inside the  
control panel. Match wires 178 and 183 in the  
transfer switch to 178 and 183 on the terminal strip  
in the control panel. The conductors for the two-wire  
start circuit must be in their own conduit.  
Wear full eye protection and protective clothing,  
• Where electrolyte contacts the skin, wash it off  
immediately with water,  
• Where electrolyte contacts the eyes, flush  
thoroughly and immediately with water and  
seek medical attention, and  
• Spilled electrolyte is to be washed down with an  
acid-neutralizing agent. A common practice is  
to use a solution of one pound (500 grams)  
bicarbonate of soda to one gallon (4 liters) of  
water. The bicarbonate of soda solution is to be  
added until the evidence of reaction (foaming)  
has ceased. The resulting liquid is to be flushed  
with water and the area dried.  
2.10 BATTERY INSTALLATION  
DANGER  
Standby generators installed with automatic  
transfer switches will crank and start  
!
automatically when normal (UTILITY) source  
voltage is removed or is below an acceptable  
preset level. To prevent such automatic start-up  
and possible injury to personnel, do not  
connect battery cables until the normal source  
voltage at the transfer switch is correct and the  
system is ready to be put into operation.  
Lead acid batteries present a risk of fire  
because they generate hydrogen gas. The  
following procedure are to be followed:  
• DO NOT SMOKE when near batteries.  
• DO NOT cause flame or spark in battery area.  
• Discharge static electricity from body before  
touching batteries by first touching a grounded  
metal surface.  
Servicing of batteries is to be performed or  
supervised by personnel knowledgeable of batteries  
and the required precautions. Keep unauthorized  
personnel away from batteries.  
Storage batteries give off explosive hydrogen  
gas. This gas can form an explosive mixture  
around the battery for several hours after  
charging. The slightest spark can ignite the gas  
and cause an explosion. Such an explosion can  
shatter the battery and cause blindness or  
other injury. Any area that houses a storage  
battery must be properly ventilated. Do not  
allow smoking, open flame, sparks or any spark  
producing tools or equipment near the battery.  
Recommended batter is Group 26, 12VDC, 550  
CCA/75 AH minimum. All batteries must be at 100  
percent state-of-charge before they are installed on  
the generator.  
Battery electrolyte fluid is an extremely caustic  
sulfuric acid solution that can cause severe  
burns. Do not permit fluid to contact eyes, skin,  
clothing, painted surfaces, etc. Wear protective  
goggles, protective clothing and gloves when  
handling a battery. If the fluid is spilled, flush  
the affected area immediately with clear water.  
!
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Section 2 — Installation  
Centurion Liquid-cooled 15 kW and 25 kW Generators  
When using maintenance-free batteries, it is not  
2.11.3 FUEL SYSTEM  
necessary to check the specific gravity or electrolyte  
level. Have these procedures performed at the  
intervals specified in Section 4, “Maintenance.” A  
negative ground system is used. Battery connections  
are shown on the wiring diagrams. Make sure all  
batteries are correctly connected and terminals are  
tight. Observe battery polarity when connecting  
batteries to the generator set.  
Make sure the fuel supply system to the generator (a)  
delivers the correct fuel at the correct pressure and  
(b) is properly purged and leak tested according to  
code. No fuel leakage is permitted. See Section 1.10,  
“Specifications” for more information.  
2.11.4 GENERATOR SET LUBRICATION  
NOTE:  
Check the engine crankcase oil level before operating  
and, if necessary, add oil to the proper level – the  
dipstick “FULLmark. Never operate the engine with  
the oil level below the dipstick ADD” mark. See  
Section 1.10, “Specifications” and Section 1.14,  
“Engine Oil Recommendations”.  
Damage will result if the battery connections are  
made in reverse.  
2.11 PREPARATION BEFORE START-UP  
The instructions in this section assume that the  
standby generator has been properly installed,  
serviced, tested, adjusted and otherwise prepared for  
use by a competent, qualified installation contractor.  
Be sure to read the “Safety Rules” on Pages 2 and 3,  
as well as all other safety information in this manual,  
before attempting to operate this (and related)  
equipment.  
NOTE:  
This engine is shipped from the manufacturer  
with 15W-40 oil. This oil should be changed after  
30 hours of operation.  
2.11.5 ENGINE COOLANT  
Have the engine cooling system properly filled with  
the recommended coolant mixture. Check the system  
for leaks and other problems. See Section 1.10,  
“Specifications” and “Recommended Coolant”.  
2.11.1 PRIOR TO INITIAL START-UP  
Prior to initially starting the generator, it must  
be properly prepared for use. Any attempt to  
crank or start the engine before it has been  
properly serviced with the recommended types  
and quantities of engine fluids (oil, coolant,  
fuel, etc.) may result in an engine failure.  
2.11.6 BELT TENSION  
!
Check the engine fan belt tension and condition prior  
to placing the unit into service and at recommended  
intervals. Belt tension is correct when a force of  
approximately 22 pounds (10 kg), applied midway  
between pulleys, deflects the belt about 3/8- to 5/8-  
inch (10 to 16 mm).  
Before starting the generator for the first time, the  
installer must complete the following procedures. For  
follow-up maintenance information and/or service  
intervals, please refer to Section 4, “Maintenance.”  
2.11.7 ELECTRICAL SYSTEM  
Make sure the generator is properly connected to an  
approved earth ground and/or ground rod.  
2.11.2 TRANSFER SWITCH  
If this generator is used to supply power to any  
electrical system normally powered by an electric  
utility, the National Electrical Code requires that a  
transfer switch be installed. The transfer switch  
prevents electrical backfeed between two different  
electrical systems. (For additional information, see  
the applicable transfer switch manual for this unit.)  
Make sure the generator battery is fully charged,  
properly installed and interconnected, and ready for  
use.  
Check to ensure that there are no loose electrical  
connections. Restrain any loose wires to keep them  
clear of any moving generator set components.  
The transfer switch, as well as the generator and  
other standby components, must be properly located  
and mounted in strict compliance with applicable  
codes, standards and regulations.  
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Section 3 - Operation  
Centurion Liquid-cooled 15 kW and 25 kW Generators  
3.2.1 HOURMETER  
3.1 USING A STANDARD “GTS”  
Indicates time the generator has operated, in hours  
and tenths of hours. Use the hourmeter along with  
the periodic maintenance schedule for the generator  
set.  
TRANSFER SWITCH  
When required, the pre-packaged standby generator  
can be installed with an engineered Generac “GTS”  
type engineered automatic transfer switch.  
When a GTS type transfer switch is used, it controls  
automatic operation and automatic transfer as  
follows:  
3.2.2 AUTO/OFF/MANUAL SWITCH  
Use this three-position switch as follows:  
• Set the switch to AUTO for fully automatic  
operation. See Section 3.4, Automatic Operation”.  
• Set switch to MANUAL position to crank and start  
the generator engine.  
• Set switch to OFF position to shut down an  
operating engine. With OFF selected, operation will  
not be possible.  
• Solid state circuits in the transfer switch monitor  
utility power source voltage.  
• When utility source voltage drops below a pre-set  
level, transfer switch action closes the circuit. The  
engine then cranks and starts as controlled by the  
pre-packaged generator’s Control Module circuit  
board.  
• After the engine starts and when the generator AC  
output voltage and frequency have reached a  
pre-set value, transfer switch circuits signal the  
transfer switch main contacts to actuate to the  
“Standby” power source side. Generator AC output  
then powers load circuits.  
• When the utility power source voltage is restored  
above a pre-set level, transfer switch solid state  
circuits signal the switch main contacts to move  
back to their utility power source side.  
Following re-transfer back to the utility power  
source side, transfer switch circuit board action  
opens the circuit. Engine then shuts down.  
NOTE:  
DANGER  
With switch set to AUTO, engine can crank  
and start suddenly without warning. Such  
automatic start up normally occurs when  
utility source voltage drops below a pre-set  
level. To prevent possible injury that might be  
caused by such sudden starts, set the  
AUTO/OFF/MANUAL switch to OFF before  
working on or around the unit. Then, place a  
"DO NOT OPERATE" tag on control console.  
!
3.2.3 FAULT INDICATOR LAMP  
The lamp goes ON when one or more of the following  
engine faults occurs and when engine shuts down.  
If the generator is installed in conjunction with an  
engineered GTS type engineered transfer switch,  
refer to the applicable transfer switch manual for  
exact operating parameters and timing sequences.  
• Low oil pressure  
• Overcrank  
• Overspeed  
• High coolant temperature  
• Low coolant level  
3.2 CONTROL CONSOLE  
3.2.4 15 AMP FUSE  
COMPONENTS  
The fuse protects the control console’s DC control  
circuit against electrical overload. If the fuse has  
melted open due to an overload, or is removed,  
engine cranking and startup may still occur when the  
AUTO/OFF/MANUAL switch is placed in the AUTO or  
MANUAL positions.  
The components of a liquid-cooled generator control  
console (Figure 3.1) are as follows:  
Figure 3.1 - Liquid-Cooled Generator Panel  
NOTE:  
To disable the control board and thus prevent  
potential crank and run, the 15 amp fuse AND the  
7.5 amp in-line fuse must both be removed or the  
battery cables should be disconnected.  
FUSE  
15-A  
AGC  
FAULT  
INDICATOR  
HOUR METER  
Should you need to replace the fuse, use only an  
identical AGC 15-amp replacement fuse.  
AUTO  
SET  
EXERCISE  
OFF  
TIME  
ON  
MANUAL  
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Section 3 - Operation  
Centurion Liquid-cooled 15 kW and 25 kW Generators  
• Locate the rocker switch on the control panel  
3.2.5 7.5 AMP IN-LINE FUSE  
identified with the words “Set Exercise Time”  
This in-line fuse is connected in wire 15A which runs  
between the AUTO/OFF/MANUAL switch and position  
10 of the 076009A PCB. This fuse protects the start,  
fuel, field boost, and transfer outputs from the PCB  
and will open if there is excessive current draw on  
any one of these outputs. If this fuse has melted open  
or is removed, the control board will be disabled and  
the unit will not be able to crank and run when the  
AUTO/OFF/MANUAL switch is placed in the AUTO or  
MANUAL positions. Replace the fuse with an identical  
AGC 7.5 amp fuse.  
(Figure 3.2).  
• Push “Set Exercise Time” switch to ON position for  
20 to 30 seconds and then release. Switch will  
spring back into its original position when  
released.  
Wait 30 seconds before setting the AUTO/OFF/  
MANUAL switch to AUTO position.  
If the AUTO/OFF/MANUAL switch is switched  
too soon, the engine may start. If engine does  
start, it will shut down automatically in about  
NOTE:  
!
This fuse will not remove the positive (+) battery  
input power from the PCB when it opens. This  
means the exercise timer will not be reset. If this  
fuse does open, carefully check the wiring to the  
start, fuel, field boost and transfer outputs before  
replacing the fuse.  
two (2) minutes.  
• Set the generator main circuit breaker to its ON or  
CLOSED position.  
• Generator is now programmed to start and  
exercise every seven days thereafter, on day and  
time of day the switch was actuated.  
• Place a sign on the generator control panel and the  
transfer switch, indicating the day and time the  
generator will be exercising.  
3.2.6 SET EXERCISE TIME SWITCH  
This switch allows for programming the generator to  
start and exercise automatically. See Section 3.5,  
“Weekly Exercise Cycle.”  
NOTE:  
If battery terminals are disconnected, the exercise  
timer needs to be reset for correct automatic  
exercise operation.  
3.3 MANUAL TRANSFER AND  
START-UP  
Figure 3.2 - “Set Exercise” Switch  
To transfer electrical loads to the STANDBY  
(GENERATOR) power source side and start the  
engine manually, refer to the Owner’s Manual of the  
particular transfer switch.  
3.4 AUTOMATIC OPERATION  
To set the system for fully automatic operation,  
proceed as follows:  
• Check that load circuits are connected to the  
utility power supply.  
• Set the AUTO/OFF/MANUAL switch to its AUTO  
position.  
• Set the generator main circuit breaker to its ON or  
CLOSED position.  
3.5 WEEKLY EXERCISE CYCLE  
The generator will start and exercise once every seven  
days. During this weekly exercise, the unit runs for  
about 20 minutes and shuts down. Transfer of loads  
to generator output does not occur during the  
exercise period.  
3.6 ENGINE BLOCK HEATER  
This standby generator comes equipped with a block  
heater (Figure 3.3), similar to the block heaters used  
in automotive applications. The block heater is wired  
to a grounded plug.  
To select day and time for exercising, proceed as  
follows:  
• Set the AUTO/OFF/MANUAL switch to OFF.  
• Set generator main circuit breaker to OFF or  
OPEN.  
®
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Section 4 — Maintenance  
Centurion Liquid-cooled 15 kW and 25 kW Generators  
Figure 3.3 - Engine Block Heater  
F. EVERY 800 OPERATING HOURS  
1. Retorque cylinder head. (See Section 1.13,  
Torque Specs”.)  
2. Retorque intake and exhaust manifold. (See  
Section 1.13, “Torque Specs”.)  
3. Check engine compression.  
4. Check valve clearance.  
4.2 COOLING SYSTEM  
Air intake and outlet openings in the generator  
compartment must be open and unobstructed for  
continued proper operation. This includes high  
grass, weeds, brush, leaves and snow.  
Without sufficient cooling and ventilating air flow, the  
engine/generator quickly overheats, which causes it  
to shut down. (See Section 7 for installation diagram  
and vent locations.)  
Refer to applicable wiring diagram(s) and electrical  
schematic(s) at back of manual for wiring  
connections. Customer supplies a 120V 15A Utility  
fed circuit for the block heater.  
4.1 MAINTENANCE PERFORMED BY  
AUTHORIZED SERVICE FACILITIES  
The exhaust system parts from this product get  
extremely hot and remains hot after shutdown.  
High grass, weeds, brush, leaves, etc. must  
remain clear of the exhaust. Such materials may  
ignite and burn from the heat of the exhaust  
system.  
A. EVERY THREE MONTHS  
1. Check battery state of charge and condition.  
2. Inspect and test fuel system.  
3. Check transfer switch.  
4. Inspect exhaust system.  
5. Check engine ignition system.  
6. Check fan belts.  
4.3 OVERLOAD PROTECTION FOR  
ENGINE DC ELECTRICAL SYSTEM  
Engine cranking, start up and running are controlled  
by a solid state Engine Controller circuit board.  
Battery voltage is delivered to that circuit board via a  
15 amp fuse. These overcurrent protection devices  
will open if the circuit is overloaded.  
B. ONCE EVERY SIX MONTHS  
1. Test Engine Safety Devices (low oil pressure, low  
coolant level, high coolant temperature).  
C. ONCE ANNUALLY  
1. Test engine governor; adjust or repair, if needed.  
2. Clean, inspect generator.  
3. Flush cooling system.  
If a circuit breaker opens or a fuse element  
melts, find the cause of the overload before  
resetting the circuit breaker or replacing the  
!
fuse.  
D. FIRST 100 OPERATING HOURS  
4.4 CHECKING FLUID LEVELS  
1. Change engine oil and oil filter. (After initial  
change, service engine oil and filter at 150  
operating hours or six months, whichever comes  
first.)  
4.4.1 CHECK ENGINE OIL  
Check engine crankcase oil level (Figure 4.1) at least  
every 20 hours of operation, or prior to use.  
2. Retorque cylinder head. (See Section 1.13,  
Torque Specs”.)  
• Remove oil dipstick and wipe dry with a clean,  
lint-free cloth.  
3. Retorque intake and exhaust manifold. (See  
Section 1.13, “Torque Specs”.)  
• Install oil dipstick, then remove again.  
• Oil should be between FULL and ADD marks.  
• If oil level is below the dipstick ADD mark, remove  
oil fill cap. Add the recommended oil to bring oil  
level up to the FULL mark. DO NOT FILL ABOVE  
THE “FULLMARK. See Section 1.14 for  
recommended oils.  
E. EVERY 500 OPERATING HOURS  
1. Service air cleaner.  
2. Check starter.  
3. Check engine DC alternator.  
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Section 4 — Maintenance  
Centurion Liquid-cooled 15 kW and 25 kW Generators  
Figure 4.1 - Oil Dipstick and Oil Fill Cap  
4.5.4 INSPECT COOLING SYSTEM  
• Inspect engine cooling system at least once each  
month.  
OIL DIPSTICK  
• Check hoses for damage, deterioration, leaks, etc.  
Correct any discrepancies found.  
• Check hose clamps for tightness.  
• Check fluid levels as outlined above.  
4.5.5 PERFORM VISUAL INSPECTION  
Complete a thorough visual inspection of the entire  
generator monthly. Look for obvious damage, loose,  
missing or corroded nuts, bolts and other fasteners.  
Look for fuel, oil or coolant leaks.  
4.5.6 INSPECT EXHAUST SYSTEM  
Inspect the exhaust system at least once every three  
months. Check all exhaust system pipes, mufflers,  
clamps, etc. for condition, tightness, leaks, security,  
damage.  
4.4.2 BATTERY FLUID  
Check battery electrolyte fluid at least once weekly.  
Fluid should cover separators in all battery cells. If  
fluid level is low, add distilled water to cover tops of  
separators. DO NOT USE TAP WATER IN BATTERY.  
4.5.7 CHECK FAN BELT  
• Inspect fan belts every three months. Replace any  
damaged, deteriorated, worn or otherwise  
defective belt.  
• Check fan belt tension. Thumb pressure, exerted  
midway between pulleys, should deflect about 3/8  
to 3/4 inch. Adjust belt tension as required.  
4.4.3 ENGINE COOLANT  
Check coolant level in coolant recovery bottle. See  
Section 1.10, Specifications.  
• Add recommended coolant mixture as necessary.  
• Periodically remove radiator pressure cap to make  
sure the coolant recovery system is functioning  
properly. Coolant should be at bottom of radiator  
filler neck. If coolant level is low, inspect gasket in  
radiator pressure cap. Replace cap, if necessary.  
To have pressure cap tested, contact an authorized  
Generac Service Dealer. Inspect cooling system  
and coolant recovery system for leaks.  
4.5.8 INSPECT ENGINE GOVERNOR  
Visually inspect electronic governor.  
DANGER  
Do not attempt to adjust the governor. Only  
qualified service persons should adjust the  
governor. Excessively high operating speeds  
are dangerous and increase the risk of  
personal injury. Low speeds impose a heavy  
load on the engine when adequate engine  
power is not available and may shorten  
engine life. Correct rated frequency and  
voltage are supplied only at the proper  
governed speed. Some connected electrical  
load devices may be damaged by incorrect  
frequency and/or voltage. Only qualified  
technicians should adjust the governed speed.  
!
4.5 MAINTENANCE OWNER/  
OPERATOR CAN PERFORM  
4.5.1 CHECK ENGINE OIL LEVEL  
Refer to “Checking Fluid Levels”, Section 4.4.  
4.5.2 CHECK BATTERY  
• Check battery fluid level each week as outlined  
under “Checking Fluid Levels”, Section 4.4.  
• Check battery cables for condition, tightness,  
corrosion or damage. Clean, tighten or replace as  
necessary.  
4.5.9 CHANGING ENGINE OIL  
Refer to maintenance performed by authorized  
service facilities for engine oil and filter change  
frequencies.  
4.5.3 EXERCISE SYSTEM  
Start the generator engine at least once every seven  
days and let it run at least 20 minutes. See Section  
3.5, “Weekly Exercise Cycle”.  
Drain the oil while the engine is still warm from  
running. This means warm up the engine, shut it  
down and drain immediately as follows:  
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Section 4 — Maintenance  
Centurion Liquid-cooled 15 kW and 25 kW Generators  
1. Remove OIL DRAIN HOSE from its retaining clip.  
See “Scheduled Maintenance”, Section 4.7, for air  
cleaner maintenance.  
2. Loosen and remove OIL DRAIN HOSE CAP. Drain  
oil completely into suitable container.  
4.5.11 SPARK PLUGS  
Reset the spark plug gap or replace the spark plugs  
as necessary. See Section 4.7.  
3. When all oil has drained, install and tighten OIL  
DRAIN HOSE CAP, and re-install into its retaining  
clip.  
4. Turn OIL FILTER (Figure 4.2) counterclockwise  
1. Clean the area around the base of the spark plugs  
to keep dirt and debris out of the engine. Clean by  
scraping or washing using a wire brush and  
commercial solvent. Do not blast the spark plugs  
to clean.  
2. Remove the spark plugs and check the condition.  
Replace the spark plugs if worn or if reuse is  
questionable. See “Scheduled Maintenance”,  
Section 4.7, for recommended inspection.  
3. Check the spark plug gap using a wire feeler  
gauge. Adjust the gap to 0.5-0.6 mm (0.020-0.025  
inch) by carefully bending the ground electrode  
(Figure 4.4).  
and remove. Dispose of old filter.  
5. Apply light coating of new engine oil to seal of new  
oil filter. Install FILTER and tighten by hand only.  
DO NOT OVERTIGHTEN.  
6. Remove OIL FILL CAP. Add recommended oil (see  
SPECIFICATIONS). DO NOT FILL ABOVE THE  
DIPSTICK “FULLMARK. Crankcase oil capacity  
is 4.0 U.S. quarts (3.8 liters).  
7. Start engine and check for oil leaks.  
Figure 4.2 - Oil Filter  
Figure 4.4 – Setting the Spark Plug Gap  
SET PLUG GAP AT 0.5-0.6 mm  
(0.020-0.025 inch)  
OIL FILTER  
After refilling the crankcase with oil, always  
check oil level on dipstick. NEVER OPERATE  
ENGINE WITH OIL BELOW THE DIPSTICK  
4.5.12 COOLANT CHANGE  
!
Every year, have Authorized Service Facility drain,  
flush and refill the cooling system. See Section 1.10,  
SPECIFICATIONS, for cooling system recommen-  
dations.  
“ADD” MARK.  
4.5.10 CHANGING THE ENGINE AIR CLEANER  
To replace the engine air cleaner, (part number  
059402), remove the air cleaner cover and remove air  
cleaner. Clean bottom plate and install the air filter  
making sure it is positioned properly before  
reattaching the cover (Figure 4.3).  
4.6 MISCELLANEOUS MAINTENANCE  
4.6.1 CLEANING THE GENERATOR  
Keep the generator as clean and as dry as possible.  
Dirt and moisture that accumulates on internal  
generator windings have an adverse effect on  
insulation resistance.  
Figure 4.3 – Engine Air Cleaner  
Air Cleaner  
Periodically clean generator exterior surfaces. A soft  
brush may be used to loosen caked on dirt. Use a  
vacuum system or dry, low pressure air to remove  
any accumulations of dirt. The generator is housed  
inside an all-weather enclosure, clean the enclosure  
with a soft, damp cloth or sponge and water. Apply a  
coat of automotive type wax once a year to help  
prevent corrosion.  
(Doors Removed for Clarity)  
®
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Section 4 — Maintenance  
Centurion Liquid-cooled 15 kW and 25 kW Generators  
Once each year, have the generator cleaned and  
DANGER  
inspected by an Authorized Service Dealer. That  
dealer will use dry, low pressure air to clean internal  
windings. Parts inside the control console should be  
cleaned and inspected at this time as well.  
Storage batteries give off explosive hydrogen  
gas. This gas can form an explosive mixture  
around the battery for several hours after  
charging. The slightest spark can ignite the gas  
and cause an explosion. Such an explosion can  
shatter the battery and cause blindness or  
other injury. Any area that houses a storage  
battery must be properly ventilated. Do not  
allow smoking, open flame, sparks or any spark  
producing tools or equipment near the battery.  
Finally, have the insulation resistance of stator and  
rotor windings checked. If insulation resistances are  
excessively low, the generator may require drying.  
4.6.2 BATTERY  
All lead-acid storage batteries discharge when not in  
use. Refer to specific instructions and warnings that  
accompany the battery. If such information is not  
available, observe the following precautions when  
handling a battery:  
Battery electrolyte fluid is an extremely caustic  
sulfuric acid solution that can cause severe  
burns. Do not permit fluid to contact eyes, skin,  
clothing, painted surfaces, etc. Wear protective  
goggles, protective clothing and gloves when  
handling a battery. If the fluid is spilled, flush  
the affected area immediately with clear water.  
!
• DO NOT use jumper cables and a booster battery  
to crank or start the generator engine.  
• DO NOT recharge a weak battery while it is  
installed in the generator. Remove battery from  
generator and recharge in a well-ventilated area,  
away from fuel vapors, sparks, heat or flames.  
• Battery electrolyte fluid is an extremely caustic  
sulfuric solution that can cause severe burns. DO  
NOT permit fluid to contact eyes, skin, clothing,  
painted surfaces, wiring insulation, etc. If any  
battery fluid is spilled, flush the affected area with  
clear water immediately.  
Do not use any jumper cables or booster  
battery to crank and start the generator  
engine. If the battery has completely  
discharged, remove it from the generator for  
recharging.  
!
!
Be sure the AUTO/OFF/MANUAL switch is set to  
the OFF position before connecting the battery  
cables. If the switch is set to AUTO or MANUAL,  
the generator can crank and start as soon as  
the battery cables are connected.  
• Always wear safety glasses, rubber apron and  
gloves when handling a battery.  
Be sure the utility power supply is turned off,  
or sparking may occur at the battery posts as  
you attach the cables and cause an explosion.  
• Batteries give off explosive hydrogen gas while  
charging. The gas can form an explosive mixture  
around the battery for several hours after charging.  
Any spark, heat or flames can ignite the gas and  
cause an explosion which can shatter the battery,  
causing blindness or other serious injury.  
4.6.4 BATTERY REPLACEMENT  
When replacing batteries, use the same number and  
the type of battery - BCI Group No. 26/26R with 525  
CCA @ 0 degrees F.  
4.6.3 BATTERY MAINTENANCE  
BCI Group No.  
CCA  
525 @ 0 deg. F  
The battery should be inspected per the “Service  
Schedule,” Section 6. The following procedure  
should be followed for inspection:  
26/26R  
NOTE:  
1. Inspect the battery posts and cables for tightness  
and corrosion. Tighten and clean as necessary.  
2. Check the battery fluid level of unsealed batteries  
and, if necessary, fill with DISTILLED WATER  
ONLY. DO NOT USE TAP WATER IN BATTERIES.  
3. Have the state of charge and condition checked.  
This should be done with an automotive-type  
battery hydrometer.  
The BCI number should be located directly on the  
battery.  
4.6.5 RODENT PROTECTION  
The intrusion of rodents into the generator set can  
cause a wide range of problems, from failure of the  
unit to start, to personal injury and, in extreme  
circumstances, short circuit or fire. Although the unit  
was designed to limit this problem, further  
precautions can be taken by the owner to help  
minimize both the chance of rodent entry and the  
extent of any damage. The following inspection  
should be performed.  
®
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Section 4 — Maintenance  
Centurion Liquid-cooled 15 kW and 25 kW Generators  
1. The base frame of the unit contains an optional  
3. Check the battery. Fill all cells to the proper level  
with deionized water. DO NOT USE TAP WATER  
IN THE BATTERY. Remove the battery before  
charging. Recharge the battery to 100 percent  
state of charge, or, if defective, replace the battery  
with a 12-volt DC Group 26/26R battery rated for  
75 amp hours 525 CCA minimum @ 0° F.  
4. Clean and wipe the entire generator.  
5. Reconnect the battery. Observe battery polarity.  
Damage may occur if the battery is connected  
incorrectly.  
fuel inlet location that is capped at the factory.  
Check that it is secured in place. The same  
applies for any access ports in the roof of the  
enclosure. If any of these caps are missing,  
contact a Generac Authorized Dealer.  
2. Inside the generator set, the chance of rodent  
entry into the control panel is greatly reduced by  
the inclusion of adjustable wire connectors.  
Check that the wire connector screws are tight,  
thus closing off any gap between the access holes  
and the wires.  
6. Open the fuel shutoff valve.  
7. Start the unit by moving the Auto/Off/Manual  
switch to MANUAL. Allow the unit to warm up  
thoroughly.  
4.7 OUT OF SERVICE PROCEDURE  
4.7.1 REMOVAL FROM SERVICE  
8. Stop the unit and set the Auto/Off/Manual switch  
to AUTO.  
If the generator cannot exercise every seven days, and  
it is to be out of service longer than 90 days, prepare  
the generator for storage as follows:  
9. Turn on the utility power to the transfer switch.  
10. The generator is now ready for service.  
1. Start the engine and let it warm up.  
4.8 FUEL PIPE SIZING  
2. Close the fuel shutoff valve in the fuel supply line  
Refer to chart for proper sizing of fuel supply piping.  
Insufficient fuel pipe size can cause hard starting,  
poor engine performance and inability to carry load.  
and allow the unit to shut down.  
3. Once the unit has shut down, it will signal a fault  
on the control panel.  
NG and LP Vapor Pipe Sizing Chart:  
4. Set the Auto/Off/Manual switch to OFF and turn  
off the utility power to the transfer switch.  
5. While the engine is still warm from running,  
drain the oil completely. Refill the crankcase with  
SAE 15W-40 oil having API Service Class SD, SE  
or SF. (See “Engine Oil Recommendations” in  
Section 1.14)  
6. Attach a tag to the engine indicating the viscosity  
and classification of the oil in the crankcase.  
7. Remove the spark plug(s) and spray fogging agent  
into the spark plug(s) threaded openings.  
Reinstall and tighten the spark plug(s).  
Length of Pipe  
Iron Pipe Size (IPS Inches)  
in Feet  
½"  
76  
52  
43  
38  
¾"  
172  
120  
99  
86  
77  
1"  
1 ¼"  
750  
535  
435  
380  
345  
310  
285  
270  
242  
225  
205  
190  
178  
170  
140  
119  
1 ½"  
1,220  
850  
700  
610  
545  
490  
450  
420  
380  
350  
320  
300  
285  
270  
226  
192  
2"  
2,480  
1,780  
1,475  
1,290  
1,120  
1,000  
920  
860  
780  
720  
660  
15  
345  
241  
199  
173  
155  
141  
131  
120  
109  
100  
92  
30  
45  
60  
75  
90  
70  
65  
105  
120  
150  
180  
210  
240  
270  
300  
450  
600  
8. Remove the battery and store it in a cool, dry  
room on a wooden board. Never store the battery  
on any concrete or earthen floor.  
620  
580  
545  
450  
9. Clean and wipe the entire generator.  
4.7.2 RETURN TO SERVICE  
390  
To return the unit to service after storage, proceed  
as follows:  
* Consumption in Cubic Feet Per Hour.  
1. Verify that utility power is turned off to the  
transfer switch and that the Auto/Off/Manual  
switch is set to OFF.  
2. Check the tag on the engine for oil viscosity and  
classification. Verify that the correct recom-  
mended oil is used in engine. See Section 1.14. If  
necessary, drain and refill with the proper oil.  
PERIODIC REPLACEMENT PARTS  
Part Name  
Oil Filter  
Generac’s Part Number  
# 0A45310244  
# 046627  
# 059402  
Radiator Cap  
Air Cleaner  
Spark Plug  
# 0A45310275  
®
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Section 4 — Maintenance  
Centurion Liquid-cooled 15 kW and 25 kW Generators  
4.9 SCHEDULED MAINTENANCE  
The following is a recommended maintenance schedule for Centurion small standby and residential generator sets.  
The established intervals in the schedule are the maximum recommended when the unit is used in an average  
service application. They will need to be decreased (performed more frequently) if the unit is used in a severe  
application. Use the unit hour meter or calendar time, whichever occurs first, from the previous maintenance  
interval to determine the next required maintenance interval.  
Service Maintenance Interval Information:  
The various service maintenance intervals are designated by interval numbers as follows:  
1 An early inspection of the generator set to insure it is ready to operate when required and to identify any  
potential problem areas.  
Performed monthly or following each 10 hours of operation of the unit and requires approximately .5 man-  
hours per unit to complete.  
This inspection may be performed by the end user providing the following safety steps are taken to prevent  
the engine from starting automatically without warning:  
To prevent injury, perform the following steps in the order indicated before starting any maintenance:  
Disable the generator set from starting and/or connecting to the load by setting the control panel  
AUTO-OFF-MANUAL switch to the “OFF” position.  
Remove the control panel fuse.  
Turn off utility supply to engine water heater.  
Turn off the battery charger by turning off utility supply to the transfer switch.  
Remove the negative battery cable.  
The battery charger must be turned off BEFORE removing the battery cable to prevent an over current condition  
from burning out sensitive control panel components and circuits.  
Following all maintenance, reverse these steps to insure the unit is returned to standby setup for normal  
operation when required.  
2 A break-in service inspection of the generator set to insure it is ready to operate and carry the load when  
required, and to identify any potential problem areas.  
Performed ONLY ONCE following the first three months or the first 30 hours of operation after purchase of  
the unit and requires approximately 2.5 man-hours per unit to complete.  
This inspection contains some maintenance tasks which require special tools, equipment, and/or knowledge  
to accomplish and should be performed only by an authorized Generac Service Dealer.  
3 An operational inspection of the generator set to insure it is ready to operate and carry the load when required,  
and to identify any potential problem areas.  
Performed semi-annually or following each 50 hours of operation of the unit and requires approximately 1.5  
man-hours per unit to complete.  
This inspection contains some maintenance tasks which require special tools, equipment, and/or knowledge  
to accomplish and should be performed only by an authorized Generac Service Dealer.  
4 A mid-level inspection of the generator set to insure it is ready to operate and carry the load when required, and  
to identify any potential problem areas.  
Performed annually or following each 100 hours of operation of the unit and requires approximately 4.0  
man-hours per unit to complete.  
This inspection contains some maintenance tasks which require special tools, equipment, and/or knowledge  
to accomplish and should be performed only by an authorized Generac Service Dealer.  
®
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Section 4 — Maintenance  
Centurion Liquid-cooled 15 kW and 25 kW Generators  
Maintenance  
Tasks  
Level 1  
Recom-  
mended  
Level 2  
Required  
Level 3  
Required  
Level 4  
Task  
Task  
Task  
Task  
Comp.  
Comp. to be done Comp. to be done Comp.  
Required  
to be done (Date-  
3 months/  
Break-in  
30 hrs.  
(Date-  
Initials)  
Semi-  
annually/  
50 hrs.  
(Date-  
Initials)  
to be done (Date-  
Annually/ Initials)  
100 hrs.  
monthly/  
10 hrs.  
Initials)  
1. Disable the unit from  
operating per the first page  
warning.  
2. Check the engine oil level.  
Adjust as necessary.  
3. Check the engine coolant  
level. Adjust as necessary.  
4. Check the engine coolant  
thermal protection level.  
Correct as necessary.  
5. Check the fuel delivery  
system on gas engine  
driven units. Tighten  
Tighten connections as  
necessary.  
6. Check the air inlets and  
outlets for debris. Clean as  
necessary.  
7. Check the battery  
electrolyte level if  
accessible. Adjust as  
necessary.  
8. Check the battery posts,  
cables, and charger for  
loose connections,  
corrosion, and proper  
operation. Correct as  
necessary.  
9. Check the unit wiring for  
loose connections,  
corrosion, and damage.  
Correct as necessary.  
10. Check the engine  
accessory drive belts for  
wear, weather cracking,  
and damage. Replace as  
necessary.  
11. Visually inspect the unit  
looking for leaks, wear or  
damage, loose connections  
or components, and  
corrosion. Correct as  
necessary.  
12. Test the engine and  
transfer switch safety  
devices. Correct and/or  
adjust as necessary.  
®
Generac Power Systems, Inc. 21  
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Section 4 — Maintenance  
Centurion Liquid-cooled 15 kW and 25 kW Generators  
Maintenance  
Tasks  
Level 1  
Recom-  
mended  
Level 2  
Required  
Level 3  
Required  
Level 4  
Task  
Task  
Task  
Task  
Comp.  
Comp. to be done Comp. to be done Comp.  
Required  
to be done (Date-  
3 months/  
Break-in  
30 hrs.  
(Date-  
Initials)  
Semi-  
annually/  
50 hrs.  
(Date-  
Initials)  
to be done (Date-  
Annually/ Initials)  
100 hrs.  
monthly/  
10 hrs.  
Initials)  
13. Initiate an automatic start  
and transfer of the unit to  
site load and exercise it for  
at least one hour looking  
for leaks, loose  
connections or  
components, and abnormal  
operating conditions.  
Correct as necessary.  
14. Start and exercise the unit  
at full rated load (use a  
load bank if the site load is  
not enough) for at least  
two hours looking for  
leaks, loose connections  
components, and abnormal  
operating conditions.  
Correct as necessary.  
15. Change the engine oil.  
16. Replace the engine oil  
filter(s).  
17. Replace the engine air  
filter(s).  
18. Check the engine spark  
plugs on gas engine driven  
units. Clean and re-gap or  
replace as necessary.  
19. Perform a five minute  
no-load operational run of  
the unit looking for any  
post service problems.  
20. Return the unit to standby  
setup for operation when  
required.  
®
22 Generac Power Systems, Inc.  
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Section 5 — Troubleshooting  
Centurion Liquid-cooled 15 kW and 25 kW Generators  
5.1 TROUBLESHOOTING POINTS  
PROBLEM  
CAUSE  
CORRECTION  
Engine won’t crank.  
1. 15 amp fuse blown.  
1. Replace fuse.  
2. Loose or corroded or defective  
battery cables.  
2. Tighten, clean or replace  
battery cables as necessary.  
3. Defective starter contactor.  
4. Defective starter motor.  
5. Dead or Defective Battery.  
3. Replace contactor.  
4. Replace starter motor.  
5. Remove, change or replace battery.  
Engine cranks but won't start  
1. Out of fuel.  
2. Fuel solenoid (FS) is defective  
3. Open Wire #14 from Engine Control  
circuit board.  
1. Replenish fuel.  
2. Replace solenoid.  
3. Reconnect wire.  
4. Spark plugs defective.  
4. Clean, regap or replace plugs.  
1. Clean or replace as needed.  
Engine starts hard, runs rough.  
Engine starts then shuts down.  
1. Flame arrestor (air cleaner) plugged or  
damaged.  
2. Plugged fuel line.  
3. Defective spark plugs.  
2. Unclog fuel line.  
3. Clean, regap or replace plugs.  
1. Engine oil level is low.  
2. Engine is overheated.  
3. Defective Low Oil Pressure Switch  
4. Defective Coolant Temperature Switch  
5. Defective Control Module circuit board.  
6. Coolant Level is Low.  
1. Check oil and add oil as needed.  
2. Check cooling system for leaks.  
3. Replace switch.  
4. Replace switch.  
5. Replace board.  
6. Repair leak - Add coolant.  
7. Replace Switch.  
7. Defective Low Coolant Level Switch  
AUTO/OFF/MANUAL Switch at  
OFF, engine continues to run  
1. Defective Auto/Off/Manual switch  
1. Replace switch.  
2. Reconnect/close wire.  
2. Open/disconnected wire #15A between  
Auto/Off/Manual switch and Control  
Module circuit board.  
3. Defective Control Module circuit board  
3. Replace board.  
No AC output from generator.  
1. Check main line circuit breaker.  
2. Check circuit breaker & fuses.  
3. Transfer switch set to NORMAL position  
4. Generator internal failure.  
1. Reset to ON or CLOSED.  
2. Reset and replace, if necessary.  
3. Set to GENERATOR position.  
4. Contact an Authorized Generac  
facility.  
5. Thermal circuit breaker open.  
5. Auto-reset - Wait 5 min. and  
attempt restart.  
®
Generac Power Systems, Inc. 23  
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Section 6 — Notes  
Centurion Liquid-cooled 15 kW and 25 kW Generators  
®
24 Generac Power Systems, Inc.  
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Section 7 - Installation Diagram  
Centurion Liquid-cooled 15 kW and 25 kW Generators  
Drawing No. 0E1533-A  
®
Generac Power Systems, Inc. 25  
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Section 8 - Electrical Data  
Centurion Liquid-cooled 15 kW and 25 kW Generators  
Wiring Diagram — Control Panel —Drawing No. 0E0345  
2
7
K
L A  
4
+
®
26 Generac Power Systems, Inc.  
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Section 8 - Electrical Data  
Centurion Liquid-cooled 15 kW and 25 kW Generators  
Wiring Diagram — 1.5L Engine — Drawing No. 0E0343-A  
LOS  
WLS  
DIS  
DC-VR  
3
1
2
4
5
CC  
FS  
14  
48  
0
49 13 14  
13  
13  
85  
56  
85  
0
0
0
RED  
3
4
5
6
8
9
85  
85  
85  
56  
0
85  
CONTROL  
PANEL  
0
0
14  
CONNECTION  
0
0
0
8
9
10  
11  
12  
13  
14  
14  
14  
GRD  
10  
11  
12  
16  
DC-A  
49  
48  
RED  
SM  
LEGEND  
CC - CONTROL CONTACTOR  
DIS - DISTRIBUTOR  
12-V.  
BATTERY  
BLACK  
DCA - DC ALTERNATOR  
EH - ENGINE HEATER  
GRD  
FS - FUEL SOLENOID  
GRD - GROUND  
EH  
LOS - LOW OIL PRESSURE SWITCH  
SM - STARTER MOTOR  
TO 120V/15A  
UTILITY FED  
CIRCUIT  
BLACK  
WHITE  
WTS - WATER TEMPERATURE SWITCH  
WLS - WATER LEVEL SENSOR  
GREEN  
TO  
ELECTRONIC  
GOVERNOR  
GOVERNOR  
ACTUATOR  
CONTROLLER  
ACTUATOR  
CONNECTOR  
®
Generac Power Systems, Inc. 27  
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Section 8 - Electrical Data  
Centurion Liquid-cooled 15 kW and 25 kW Generators  
Wiring Diagram — 1.5L Guardian — Drawing No. 0E1525  
RED  
RED  
BLACK  
BLACK  
BLUE  
BLUE  
®
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Section 8 - Electrical Data  
Centurion Liquid-cooled 15 kW and 25 kW Generators  
Electrical Schematic — 1.5L — Drawing No. 0A7182-B  
WTS  
LOS  
85  
85  
WLS  
0
0
13  
0
CC  
56  
0
0
56  
14  
14  
FS  
14  
14  
13  
49  
49  
49  
49  
0
14  
13  
12V BATTERY  
(+)  
(-)  
13  
RED  
BLACK  
CC  
SM  
16  
0
0
GRD  
BLACK  
WHITE  
LEGEND  
EH  
GREEN  
CC - CONTROL CONTACTOR  
DCA - DC ALTERNATOR  
EH - ENGINE HEATER  
FS - FUEL SOLENOID  
GRD - GROUND  
ISC - IGNITION SYSTEM CONTACT  
LOS - LOW OIL SWITCH  
SM - STARTER MOTOR  
WTS - WATER TEMPERATURE SWITCH  
WLS - WATER LEVEL SWITCH  
ACTUATOR  
CONNECTOR  
®
Generac Power Systems, Inc. 29  
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Section 9 - Exploded Views and Parts  
Centurion Liquid-cooled 15 kW and 25 kW Generators  
Governor Assembly — Drawing No. 0E1331-B  
5
4
3
ITEM (13) NEOPRENE  
COATING  
2
1
14  
6
7
10  
WIRE HARNESS  
15  
SECURE WIRE HARNESS  
WITH TIE WRAP AS SHOWN.  
12  
7
9
16  
"A"  
17  
TO "A"  
10  
7
6
INTAKE MANIFOLD  
(REF.)  
CARBURETOR ARM  
(REF.)  
11  
ITEM  
PART NO.  
QTY.  
DESCRIPTION  
1
2
3
4
5
6
7
8
9
10  
11  
12  
13  
14  
15  
16  
17  
18  
098290  
098941A  
098958A  
098942A  
098225  
043146  
022097  
084543A  
098783  
037398  
0E1326  
0A7106  
074031  
029333A  
022507  
022473  
064526  
0E1694  
1
1
REF  
1
2
3
5
1
1
2
1
1
AR  
10  
2
2
1
1
ASM MOTOR STEPPER  
HOUSING GOVERNOR CONNECTOR  
CONNECTOR INTERFACE ASSEMBLY  
COVER CONNECTOR HOUSING  
SCREW FHM #2 X 5/8 SELF TAP  
SCREW HHC M6-1.0 X 10 G8.8  
WASHER LOCK M6-1/4  
SCREW PHM M3-0.5 X 12MM  
LEVER STEPPER MOTOR  
NUT LOCK HEX #10-32 NYL INS  
ASSY. CARBURETOR LINKAGE ROD  
BRACKET STEPPER MOTOR  
LIQUID NEOPRENE  
TIE WRAP 7.4"X.19" BLK UL  
SCREW HHC 1/4-20 X 1/2 G5  
WASHER FLAT 1/4 ZINC  
SCREW TAP HWH #6-25 X 3/8 ZINC  
SPRING,ANTI LASH  
®
30 Generac Power Systems, Inc.  
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Section 9 - Exploded Views and Parts  
Centurion Liquid-cooled 15 kW and 25 kW Generators  
Mounting Base — Drawing No. 0E0768-B  
8
7
6
14  
5
7
13  
6
7
6
4
9
5
15  
15  
7
6
10  
11  
16  
18  
2
17  
20  
3
9
10  
1
ITEM  
PART NO.  
QTY.  
DESCRIPTION  
1
2
3
4
5
6
7
8
9
10  
11  
13  
14  
15  
16  
17  
18  
19  
20  
21  
0D8656  
027482  
070936  
070936C  
039253  
022145  
022129  
045771  
071956  
051730  
021991  
0D9335  
0D9336  
0C2454  
047411  
022097  
022473  
055414  
049813  
026850  
1
2
2
2
8
12  
16  
4
4
4
1
2
2
12  
1
1
1
1
1
BASE,MOUNTING 1.5L STNRD&ACSTC  
WASHER SHAKEPROOF EXT 5/16 STL  
DAMPENER VIBRATION  
VIB. ISO. 70-75 DURO  
SCREW HHC M8-1.25 X 20 G8.8  
WASHER FLAT 5/16 ZINC  
WASHER LOCK M8-5/16  
NUT HEX M8-1.25 G8 YEL CHR  
WASHER FLAT M8  
SCREW HHC M8-1.25 X 60 G8.8  
EARTH STRAP  
PANEL, SUPPORT  
PANEL, BRACKET  
SCREW TH-FRM M6-1X16 N WA Z/JS  
SCREW HHC M6-1.0 X 16 G8.8  
WASHER LOCK M6-1/4  
WASHER FLAT 1/4-M6 ZINC  
LUG SLDLSS #2-#8 X 17/64 CU  
NUT HEX M6 X 1.0 G8 YEL CHR  
WASHER SHAKEPROOF EXT 1/4 STL  
1
®
Generac Power Systems, Inc. 31  
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Section 9 - Exploded Views and Parts  
Centurion Liquid-cooled 15 kW Generator  
Standard Compartment — Drawing No. 0E0771-E  
21  
WELD STUD UNDER ROOF  
PANEL FOR ACCESS COVER  
E
1
11  
13  
14  
2
15  
4
29  
22  
23  
"Y"  
26  
11  
10  
26  
17  
10  
11  
11  
11  
9
15  
8
26  
17  
26  
10  
15  
26  
19  
24  
6
3
25  
24  
19  
17  
NOTE:  
10  
USE DOOR LATCH  
FASTENER TO SECURE  
GROUND WIRE.  
5
24  
7
NOTE:  
11  
®
32 Generac Power Systems, Inc.  
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Section 9 - Exploded Views and Parts  
Centurion Liquid-cooled 15 kW Generator  
Standard Compartment — Drawing No. 0E0771-E  
ITEM  
PART NO.  
QTY.  
DESCRIPTION  
1
2
3
4
5
6
7
8
9
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
28  
29  
0D8666  
0D8664C  
0D8657  
0D8660  
0A7568  
0D8659  
0D8662  
0D8661  
0D8658  
067042  
0C2454  
033530  
051716  
022152  
0912970064  
023762  
0912970063  
022264  
067035  
022127  
0C2634A  
022473  
022097  
0D2023  
0F3390  
037337  
0D2023  
0D8664A  
0D8664B  
1
1
1
2
2
1
1
1
1
2
40  
3
3
3
3
3
3
6
6
1
1
1
1
3
1
6
21  
1
1
ROOF ACSTC&STND CMPRTMNT 1.5L  
DUCT CENTER 1.5L  
SUPPORT RADIATOR 1.5L MITSU  
BRACE SIDE 1.5L MITSU  
DOORWELDMENT 1.5EPS  
CORNER POST REAR RH SIDE 1.5L  
DOOR REAR COMPARTMENT 1.5L  
BRACE REAR 1.5L MITSU  
CORNER POST REAR LH SIDE 1.5L  
LATCH & CAM  
SCREW TH-FRM M6-1 X 16 N WA Z/JS  
SCREW PHM #10-32 X 5/8 ZINC  
NUT HEX M5-0.8 G8 YEL CHR  
WASHER LOCK #10  
ASSEMBLY BASE-DOOR GROUND WIRE  
WASHER SHAKEPROOF EXT #10 STL  
GRD WIRE ASS'Y 99HSB  
WASHER LOCK #8-M4  
SCREW PPHM #8-32 X 5/16  
NUT HEX 1/4-20 STEEL  
ASSEMBLY COVER ACCESS  
WASHER FLAT 1/4 ZINC  
WASHER LOCK M6-1/4  
GASKET CLIP-ON SELF GRIPPING  
LATCH AND CAM  
NUT HEX JAM 3/8-24 SS  
GASKET CLIP-ON SELF GRIPPING  
DUCT LH SIDE 1.5L  
DUCT RH SIDE 1.5L  
®
Generac Power Systems, Inc. 33  
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Section 9 - Exploded Views and Parts  
Centurion Liquid-cooled 25 kW Generator  
Acoustic Compartment — Drawing No. 0E0772-G  
®
34 Generac Power Systems, Inc.  
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Section 9 - Exploded Views and Parts  
Centurion Liquid-cooled 25 kW Generator  
Acoustic Compartment — Drawing No. 0E0772-G  
ITEM  
PART NO.  
QTY.  
DESCRIPTION  
1
2
3
4
5
6
7
8
9
0D8666  
0D8664C  
0D8657  
0D8660  
0A7568  
0D8659  
0D8662  
0D8661  
0D8658  
067042  
0C2454  
033530  
051716  
022152  
0912970064  
023762  
1
1
1
2
2
1
1
1
1
2
40  
3
3
3
3
3
3
6
6
13  
1
9
9
9
2
2
1
1
2
1
1
2
2
2
2
2
2
1
1
2
2
3
1
6
1
1
2
ROOF ACSTC & STND CMPRTMNT 1.5L  
DUCT CENTER 1.5L  
SUPPORT RADIATOR 1.5L MITSU  
BRACE SIDE 1.5L MITSU  
DOOR WELDMENT 1.5 EPS  
CORNER POST REAR RH SIDE 1.5L  
DOOR REAR COMPARTMENT 1.5L  
BRACE REAR 1.5L MITSU  
CORNER POST REAR LH SIDE 1.5L  
LATCH & CAM  
SCREW TH-FRM M6-1 X 16 N WA Z/JS  
SCREW PHM #10-32 X 5/8 ZINC  
NUT HEX M5-0.8 G8 YEL CHR  
WASHER LOCK #10  
ASSEMBLY BASE-DOOR GROUND WIRE  
WASHER SHAKEPROOF EXT #10 STL  
GRD WIRE ASS'Y 99HSB  
WASHER LOCK #8-M4  
SCREW PPHM #8-32 X 5/16  
WASHER SELF LOCKING DOME  
ASSEMBLY COVER ACCESS  
WASHER FLAT 1/4 ZINC  
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
28  
29  
30  
31  
32  
33  
34  
35  
36  
37  
38  
39  
40  
41  
42  
43  
45  
46  
47  
48  
0912970063  
022264  
067035  
078115  
0C2634A  
022473  
022097  
022127  
WASHER LOCK M6-1/4  
NUT HEX 1/4-20 STEEL  
0D8663  
0D8665  
0E0072D  
0E0072B  
0E0072Q  
0E0072C  
0E0072A  
0E0072M  
0E0072P  
0E0072L  
0E0072N  
0E0072G  
0E0072J  
0E0072F  
0E0072E  
0E0072K  
0E0072H  
0D2023  
0F3390  
BAFFLE CNTRL PNL 1.5L ACOUSTIC  
BAFFLE DOOR 1.5L ACOUSTIC UNIT  
ACSTC INSLTN 1.5L DUCT RH PNL  
ACSTC INSLTN 1.5L DUCT LH PNL  
ACSTC INSLTN 1.5L RAD SUPPORT  
ACSTC INSLTN 1.5L DUCT FNT PNL  
ACSTC INSLTN 1.5L ROOF PANEL  
ACSTC INSLTN 1.5L SIDE DR PNL  
ACSTC INSLTN 1.5L SIDE DR PNL  
ACSTC INSLTN 1.5L SIDE BRC PNL  
ACSTC INSLTN 1.5L DR BAFFLE PL  
ACSTC INSLTN 1.5L RR CRNR TOP  
ACSTC INSLTN 1.5L RR CRNR BOTT  
ACSTC INSLTN 1.5L REAR DR PNL  
ACSTC INSLTN 1.5L REAR BRC PNL  
ACSTC INSLTN 1.5L BAFFLE PANEL  
ACSTC INSLTN 1.5L CNTRL SUPPT  
GASKET CLIP-ON SELF GRIPPING  
LATCH AND CAM  
037337  
NUT HEX JAM 3/8-24 SS  
DUCT LH SIDE 1.5L  
DUCT RH SIDE 1.5L  
INSUL ACO 1.5L DUCT FRNT PNL  
0D8664A  
0D8664B  
0E0072R  
®
Generac Power Systems, Inc. 35  
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Section 9 - Exploded Views and Parts  
Centurion Liquid-cooled 15 kW and 25 kW Generators  
Control Panel — Drawing No. 0E0778-G  
®
36 Generac Power Systems, Inc.  
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Section 9 - Exploded Views and Parts  
Centurion Liquid-cooled 15 kW and 25 kW Generators  
Control Panel — Drawing No. 0E0778-G  
ITEM PART NO. QTY. DESCRIPTION  
ITEM PART NO. QTY. DESCRIPTION  
1
2
3
0D9322  
0D9332  
0D9325A  
1
1
1
PANEL BACK & BOTTOM GUARDIAN  
PANEL LH SIDE GUARDIAN & SPRN  
PANEL FRONT CONTROL GUARDIAN  
W/ SILKSC  
PANEL RH SIDE C-PANEL SML BRK  
HOURMETER  
LIGHT 12VDC .02A LED RED PILOT  
HOLDER FUSE  
FUSE 15A X AGC15  
SWITCH ROC DPDT ON-OFF-ON  
SWITCH ROCKER DPST 125V SPD  
ASSEMBLY REGULATOR POTTED  
TFMR ASM CMA 240/12V  
PP LOGIC ASM 50/60HZ  
HARNESS CONTROL PANEL PP  
GUARDIAN  
RELAY SOLENOID 12VDC PNL MNT  
CIRCT BRK 4 X 1 ETA 46-500-P  
BLOCK TERM 20A 7 X 6 X 1100V  
BLOCK TERM 20A 2 X 6 X 1100V  
BLOCK TERM 20A 20 X 6 X 1100V  
ASSY L.C. ELECT GOV  
DECAL CUST. CONNT. PRE-PACK1.5L  
DECAL TERMINAL STRIP PRE-PACK  
NUT SPACER.250 PCB  
SCREW PPH TAPPING #6 X 5/8 SS  
SCREW PHM M6-1.0 X 20MM  
WASHER LOCK M6-1/4  
WASHER FLAT 1/4-M6 ZINC  
SCREW PHTT M4-0.7 X 16 ZYC  
WASHER SHAKEPROOF EXT #10  
STL  
30  
31  
32  
33  
34  
35  
36  
37  
38  
39  
40  
41  
42  
43  
44  
45  
46  
47  
48  
49  
50  
51  
52  
53  
0C2267  
023897  
0C2454  
054199  
081988  
0E2514  
0A1354A  
074908  
020911  
051713  
049226  
051716  
036261  
0D9334  
061979  
022237  
022241  
057073  
055440  
0D8671  
0912970080  
049813  
033121  
026850  
14  
15  
4
1
1
1
1
4
4
5
5
5
4
1
1
1
1
1
1
1
1
1
1
1
SCREW HHTT M5-0.8 X 12 BP  
WASHER FLAT #10 ZINC  
SCREW TH-FRM M6-1X16 N WA Z/JS  
DECAL HIGH VOLTAGE  
DECAL EXERCISE INFO  
STRAIGHT WIRE CONNECTOR 1 1/2"  
REGULATOR - DC ALT  
SCREW HHTT M5-0.8 X 10 BP  
SCREW PPHM M5-0.8 X 30 ZINC  
WASHER FLAT M5  
4
5
6
7
8
0D9330  
0C1457  
064009  
032300  
022676  
0E4494  
082573  
083048  
083264  
076009A  
0E0331  
1
1
1
1
1
1
1
1
1
1
1
9
10  
11  
12  
13  
14 *  
WASHER LOCK M5  
NUT HEX M5-0.8 G8 YEL CHR  
RIVET POP .125 X .129-.133/#30  
PANEL, TOP  
BUS BAR  
WASHER LOCK 3/8  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
28  
29  
056739  
049350  
047822  
048766  
057335  
098647  
0E1454  
0E1459  
072566  
080882  
0A8955  
022097  
022473  
0C2212  
023762  
1
1
1
1
1
1
1
1
4
4
2
3
2
10  
2
NUT HEX 3/8-16 STEEL  
JUNCTION BLOCK 3/8-16  
SCREW HHC M5-0.8 X 25 G8.8  
HINGE CONTINUOUS 1.5L CNTL PNL  
WIRE ASSEMBLY  
NUT HEX M6 X 1.0 G8 YEL CHR  
SCREW HHC #10-32 X 1/2  
WASHER SHAKEPROOF EXT 1/4  
STL  
NUT HEX #10-32 STEEL  
WASHER LOCK #10  
CAPACITOR FILTER ASY  
SCREW PHTT #6-32 X 5/8 ZYC  
DECAL WARNING REMOVE FUSE  
54  
55  
56  
57  
58  
022158  
022152  
0A3968  
0C2323  
0E3783  
1
1
1
2
1
* NOT SHOWN  
®
Generac Power Systems, Inc. 37  
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Section 9 - Exploded Views and Parts  
Centurion Liquid-cooled 15 kW and 25 kW Generators  
Engine — Drawing No. 0E1228-E  
®
38 Generac Power Systems, Inc.  
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Section 9 - Exploded Views and Parts  
Centurion Liquid-cooled 15 kW and 25 kW Generators  
Engine — Drawing No. 0E1228-E  
ITEM PART NO. QTY. DESCRIPTION  
ITEM PART NO. QTY. DESCRIPTION  
1
2
4
5
6
7
8
9
0A4531  
022473  
0A45310258  
0A4355  
0E2632  
022097  
022507  
052212  
046526  
022131  
0C2499  
055993  
045772  
023586  
020692  
0A7005  
052243  
0A4772  
070901  
051735  
056768  
022145  
022129  
022259  
052213  
047411  
052830  
045771  
058306  
030795  
0A2711A  
048665  
075885  
0A45310257  
0E1100  
0E0561  
1
2
1
1
1
8
2
2
4
20  
2
1
1
2
1
2
1
1
2
3
3
9
18  
2
11  
2
1
12  
5
2
1
1
1
1
1
1
ENGINE-1.5L  
WASHER FLAT 1/4 ZINC  
GASKET-EXHAUST MANIFOLD  
MANIFOLD-EXHAUST  
HEAT SHIELD EXH 1.5L  
42  
43  
44  
45  
46  
061012  
039253  
0A5110  
0A7006  
025507  
1
4
1
1
2
PLUG STD PIPE 1/8 SCKT HD  
SCREW HHC M8-1.25 X 20 G8.8  
PIPE WATER-INLET  
O-RING 1-1/16 X 1-5/16 X 1/8  
WASHER SHAKEPROOF EXT 7/16  
STL  
SPACER .41 X .75 X .25 ST/ZNC  
SWITCH OIL PRESSURE  
ELBOW 90D STREET 1/8  
ADAPTOR 1/8 NPTF TO 1/8-28  
PLUG STD PIPE 1/4 STEEL SQ HD  
SCREW HHC M10-1.5 X 110 G8.8  
SCREW HHC M8-1.25 X 35 G8.8  
SCREW HHC M12-1.25 X 55 G8.8  
WASHER LOCK M12  
PULLEY-CRANKSHAFT (1800 RPM)  
BUILT PRIOR TO 11/20/02  
PULLEY-CRANKSHAFT (1800 RPM)  
BUILT AFTER 11/20/02  
PULLEY-CRANKSHAFT (3600 RPM)  
BUILT PRIOR TO 11/20/02  
PULLEY-CRANKSHAFT (3600 RPM)  
BUILT AFTER 11/20/02  
BRACKET - ALT SUPPRT  
DC ALTERNATOR-12V  
ARM ADJUST ALTERNATOR  
SCREW HHC M6-1.0 X 70 G8.8  
WASHER FLAT M6  
WASHER LOCK M6-1/4  
SCREW HHC 1/4-20 X 1/2 G5  
SCREW HHC M10-1.25 X 25 G8.8  
WASHER-LOCK-M10  
WASHER FLAT 3/8 ZINC  
STAMPING ENG FOOT  
47  
48  
49  
50  
51  
52  
53  
54  
55  
56  
022500B  
0A8584  
036277  
042574  
026073A  
0A6701  
039414  
0A5568  
051769  
0A4804  
2
1
1
1
1
1
1
1
1
1
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
28  
30  
31  
32  
33  
34  
35  
36  
37  
38  
SPACER .41 X .75 X .12 STL/ZNC  
NUT HEX M10-1.5 G8 YEL CHR  
SCREW SHC 5/16-18 X 2 G8.8 NZ  
STARTER-12V  
SPACER .56 X 1 X .37 ST/ZNC  
SCREW HHC M10-1.5 X 60 G8.8  
ENGINE PLATE  
SLEEVE DOWEL BLHSG  
SCREW HHC M10-1.5 X 70 G8.8  
SCREW HHC M10-1.5 X 90 G8.8  
WASHER FLAT 5/16 ZINC  
WASHER LOCK M8-5/16  
NUT HEX 5/16-18 STEEL  
SCREW HHC M10-1.25 X 20 G8.8  
SCREW HHC M6-1.0 X 16 G8.8  
SCREW HHC M10-1.25 X 45 G8.8  
NUT HEX M8-1.25 G8 YEL CHR  
SCREW SHC M8-1.25 X 25 G12.9  
SCREW HHC 5/16-18 X 1 G5  
ADAPTER-THERMOSTAT  
GASKET THERMOSTAT  
0A4804A  
0A4800  
1
1
1
0A4800A  
57  
58  
59  
60  
61  
62  
63  
64  
0A5839  
0A1354B  
0A4839  
055816  
1
1
1
4
9
1
1
1
1
1
1
1
1
1
1
1
2
049811  
0E1936  
0A2628  
0A5275  
0A5586  
0A4814  
0A45310244  
0C1852  
0912970066  
070928  
FAN COOLING 15"  
PULLEY - FAN 95 DIA  
V-BELT 3/8 X 32-1/8 1.5L  
V-BELT 3/8 X 28.9 1.5L  
SPACER PULLEY  
THERMOSTAT 195 DEG  
65  
66  
67  
68  
69  
70  
71  
72  
GASKET INLET MANIFOLD  
MANIFOLD INTAKE MACHINED  
ASSY WATER LEVEL SENSOR C/E  
PL  
SW-TMP 245 DEG 3/8 NPT  
BARBED EL 90 3/8 NPT X 5/8  
PLUG STD PIPE 3/8 STEEL SQ HD  
FILTER OIL  
ADAPTER DRAIN OIL  
GROUND WIRE (STARTER)  
CLAMP HOSE - OIL DRAIN  
HOSE ASM.-OIL DRAIN  
CAP HEX 1/4NPT BRASS  
SCREW CRMPTIT 1/4-20 X 5/8  
39  
40  
41  
0A6751  
034339  
026925  
1
1
1
069860C  
069811  
075443  
®
Generac Power Systems, Inc. 39  
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Section 9 - Exploded Views and Parts  
Centurion Liquid-cooled 15 kW and 25 kW Generators  
Radiator — Drawing No. 0E0769-H  
®
40 Generac Power Systems, Inc.  
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Section 9 - Exploded Views and Parts  
Centurion Liquid-cooled 15 kW and 25 kW Generators  
Radiator — Drawing No. 0E0769-H  
ITEM  
PART NO.  
QTY.  
DESCRIPTION  
1
2
3
4 *  
5
6
7
8
9
0D8657  
0A5734  
0A6237  
0A6238  
084918  
051520N  
048031C  
099502  
083709  
052250  
047411  
022097  
049813  
022473  
084427  
051520Z  
075443  
056892  
0A6284  
0A6258  
029032  
031669  
060035  
022127  
046627  
0C7649  
0C2454  
076749  
0E0726  
035461  
0A7275  
0A2111  
065852  
047290A  
1
1
1
1
1
1
4
4
1
2
4
8
2
9
1
1
6
4
1
1
1
4
4
4
1
1
4
1
1
1
3
2
2
1
SUPPORT RADIATOR 1.5L MITSU  
RADIATOR 1.5L  
VENTURI 1.5L MODINE  
GUARD FAN 1.5L MODINE  
HEATER ENGINE 0500W 120V  
TUBING 5/8 ID X 12  
CLAMP HOSE BAND 1/4  
CLAMP HOSE #24 B1.06 - 2.00  
CLAMP WIRE HOSE .573 - .551  
TAPE FOAM 1 X 1 (12" LG)  
SCREW HHC M6-1.0 X 16 G8.8  
WASHER LOCK M6-1/4  
NUT HEX M6 X 1.0 G8 YEL CHR  
WASHER FLAT 1/4 ZINC  
BRACKET HEATER  
10  
11  
12  
13  
14  
15  
16  
17 *  
18  
19  
20  
21  
22  
23  
24  
26  
27  
28  
29  
30  
31  
32  
33  
34  
35  
TUBING 5/8 ID X 18"LG  
SCREW CRMPTIT 1/4-20 X 5/8  
SCREW CRIMPTITE 10-24 X 3/8  
HOSE - LOWER RADIATR  
HOSE - UPPER RADIATR  
HOSE 9/32 ID (36" LG)  
BOLT CARR 1/4-20 X 1-3/4 JS500  
SPACER .41 X .75 X .87 ST/ZNC  
NUT HEX 1/4-20 STEEL  
CAP RADIATOR  
CLAMP HOSE .38-.87  
SCREW TH-FRM M6-1 X 16 N WA Z/JS  
TANK COOLANT RECOVERY  
BRACKET WATER BOTTLE 1.5L MIT  
BARBED STR 1/4 NPT X 3/8  
FOAM 1.5 X 1 ADH BAK  
SCREW SWAGE 10-32 X 5/16 Z/YC  
SPRING CLIP HOLDER .37-.62  
ASSY. RAD. DRAIN HOSE  
* FAN GUARD KIT 0E3596 (NOT USED WITH LEVEL ONE GUARDING)  
®
Generac Power Systems, Inc. 41  
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Section 9 - Exploded Views and Parts  
Centurion Liquid-cooled 15 kW and 25 kW Generators  
Fuel System — Drawing No. 0E0774-D  
18  
13  
21  
24  
8
25  
22  
17  
16  
29  
"C"  
"D"  
14  
30  
12  
34  
36  
31  
37  
35  
32  
33  
38  
39  
40  
19  
41  
26  
20  
6
28  
PORT  
"OUT 1"  
(NATURAL GAS)  
41  
3
6
11  
43  
9
14  
42  
10  
"D"  
23  
40  
41  
7
6
PORT  
"OUT 2"  
2
15  
11  
5
27  
4
®
42 Generac Power Systems, Inc.  
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Section 9 - Exploded Views and Parts  
Centurion Liquid-cooled 15 kW and 25 kW Generators  
Fuel System — Drawing No. 0E0774-D  
ITEM  
PART NO.  
QTY.  
DESCRIPTION  
1 *  
2
3
4
5
6
7
8
9
10  
11  
12  
13  
14  
15  
16 **  
17  
18  
19  
20  
21 **  
22 **  
23  
24  
25  
26  
27  
28  
29  
---------  
1
1
1
2
2
6
2
1
1
1
1
1
1
4
1
1
1
1
1
1
4
4
1
1
1
2
1
2
1
1
1
1
1
1
1
1
1
1
1
1
1
2
1
2
2
WELDMENT MOUNTING BASE  
FLANGE FUEL INLET  
ASSY REGULATOR 1.5L N.G.OR LPV  
SCREW HHC M8-1.25 X 20 G8.8  
WASHER FLAT 5/16 ZINC  
WASHER LOCK M8-5/16  
NUT HEX M8-1.25 G8 YEL CHR  
BRACKET-RAD HOSE  
BARBED EL 90 5/16 X 1/8 NPT  
HOSE 9/32 ID 11"  
FUEL HOSE ASSM. NAT.GAS/L.P.V.  
HOSE 9/32 ID 6.5"  
COVER AIR CLEANER  
CLAMP HOSE BAND 1/4  
DECAL INLET PRESSURE  
ADAPTER,CARB.TO AIR CLNR  
FILTER ELEMENT  
NUT WING 1/4-20 NYLK  
CARBURETOR ASSY. 1.5L  
CARBURETOR GASKET  
SCREW PPHM M5-0.8 X 12 ZNC  
WASHER LOCK M5  
ELBOW 90D STREET 3/4  
STUD TH 1/4-20 X 3 G2 ZNC FULL  
NUT HEX 1/4-20 STEEL  
075580  
0E1006  
039253  
022145  
022129  
045771  
0A7040  
032552  
029032  
0E1056  
029032  
0A5547  
048031C  
0D1509  
0E0591  
059402  
037561  
0E1028  
059401  
091526  
049226  
026307  
062522  
022127  
022259  
050279  
0A6125  
0D8492Q  
0D8492R  
0E1104  
0E0668  
0E0590  
0C5133  
0E0665  
0E1108  
033138  
022152  
0E0645  
063463A  
0E1558  
057823  
0E1111  
042907  
0C2454  
NUT HEX 5/16-18 STEEL  
DECAL FUEL INLET NG  
STUD 5/16-18 X 1.25 F THR  
DECAL EMISSION CTRL 1.5 NG 2004 (10-15KW NATURAL GAS)  
DECAL EMISSION CTRL 1.5 LP 2004 (10-15KW LP VAPOR UNITS)  
GASKET AIR CLEANER ADAPTER  
O-RING 2-028 1.38 X 1.50 X .06  
VENTURI 18MM  
30 **  
31 **  
32 **  
33 **  
34 **  
35 **  
36 **  
37 **  
38 **  
39 **  
40  
O-RING 29.82 X 2.62  
SCREW THROTTLE PIN STOP  
THROTTLE ARM REWORK  
SCREW HHM #10-32 X 5/8  
WASHER LOCK #10  
LEVER THROTTLE STOP  
BARBED STR 3/8NPT X 1/2 W/VS  
HOSE LPG & NAT GAS 1/2 ID (23"LG)  
CLAMP HOSE #10 .56 - 1.06  
PLATE, GAS REGULATOR MOUNTING  
SCREW HHC M8-1.25 X 16 G8.8  
SCREW TH-FRM M6-1 X 16 N WA Z/JS  
41  
42  
43  
44  
*
SHOWN IN OTHER VIEW  
** INCLUDED IN ITEM 19 (CARBURETOR ASY. )  
®
Generac Power Systems, Inc. 43  
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Section 9 - Exploded Views and Parts  
Centurion Liquid-cooled 15 kW and 25 kW Generators  
Alternator — Drawing No. 0A9348-F  
®
44 Generac Power Systems, Inc.  
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Section 9 - Exploded Views and Parts  
Centurion Liquid-cooled 15 kW and 25 kW Generators  
Alternator — Drawing No. 0A9348-F  
ITEM  
PART NO.  
QTY.  
DESCRIPTION  
1
098671  
098681  
098675  
098936  
0A5336A  
0A1659  
071912  
049226  
051713  
022129  
098672  
098673  
098674  
098682  
098683  
098684  
098676  
098677  
098678  
097620  
098937  
097621  
0A5382  
075591  
075476  
0A5601  
075554B  
0A9375  
022152  
097146  
042558  
0A5061  
0A4989  
053557  
051769  
049541  
046526  
045772  
087599  
077043E  
022131  
072578  
0A7043  
049808  
058589  
023365  
0A8830  
072080  
1
1
1
1
1
1
4
4
4
4
1
1
1
1
1
1
1
1
1
1
1
1
1
1
4
1
4
4
4
1
1
1
1
1
6
4
4
4
1
1
4
1
5
5
1
4
4
1
ASSY ROTOR 10KW  
ASSY ROTOR 15KW  
ASSY ROTOR 20KW  
ASSY ROTOR 25KW  
HOUSING BLOWER  
SCREEN AIR OUTLET  
SCREW PPHM M5-0.8 X 8 SS  
WASHER LOCK M5  
WASHER FLAT M5  
2
3
4
5
6
7
8
WASHER LOCK M8-5/16  
ASSY STATOR 10KW A  
ASSY STATOR 10KW D  
ASSY STATOR 10KW GJK  
ASSY STATOR 15KW 1PH A  
ASSY STATOR 15KW 3PH D  
ASSY STATOR 15KW 1PH GJK  
ASSY STATOR 20KW 1PH A  
ASSY STATOR 20KW 1PH D  
ASSY STATOR 20KW 1PH GJK  
ASSY STATOR 25KW 1PH A  
ASSY STATOR 25KW 1PH D  
ASSY STATOR 25KW 3PH D  
BEARING CARRIER REAR  
ASSY HOLDER BRUSH  
SCREW PPHM M4-0.7 X 16  
COVER REAR BEARING CARRIER  
BOLT STATOR X 16" LG  
SCREW RHM #10-24 X 2  
WASHER LOCK #10  
FAN & RING GEAR ASSEM.  
KEY SQ 3/8 X 1 STEEL  
SPACER-FLEX PLATE  
PLATE, FLEX  
SCREW HHC M12-1.75 X 40 G8.8  
WASHER LOCK M12  
SCREW HHC M10-1.5 X 35 G8.8  
WASHER LOCK M10  
NUT HEX M10-1.5 G8 YEL CHR  
PLUG PLASTIC 3/8 NPT  
FLEX CONDUIT 1" BLACK (NOT SHOWN)  
WASHER FLAT 3/8-M10 ZINC  
SPACER ROTOR SHAFT  
SCREW HHC M12-1.25 X 25 G8.8  
WASHER FLAT M12  
DECAL WARN ENG START  
WASHER SHAKEPROOF INT #8  
WASHER FLAT .34 ID X .75 OD  
DECAL, DANGER STANBY UNITS  
9
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
26 *  
27  
28  
29  
30  
31  
32  
33  
35  
36  
* USED ON PRE-PACKAGED UNITS ONLY  
®
Generac Power Systems, Inc. 45  
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Section 9 - Exploded Views and Parts  
Centurion Liquid-cooled 15 kW and 25 kW Generators  
Battery — Drawing No. 0E0770-A  
8
STARTER  
SOLENOID  
2
13  
4
14  
8
3
1
TO ENGINE  
BLOCK  
16  
5
6
7
9
15  
ITEM  
PART NO.  
QTY.  
DESCRIPTION  
1
2
3
4
5
6
7
8
9
13  
14  
15  
16  
17  
077483  
038804D  
038805B  
0742600131  
022131  
046526  
052213  
075763  
0D8668  
050331A  
050331  
0C2454  
025507  
027482  
1
1
1
1
1
1
1
3
1
1
1
2
1
2
BATT 12VDC 75-AH 26  
CABLE BATT RED #4 X 20.00  
CABLE BATT BLK #4 X 23.00  
ASSY,WIRE#16 RED 1.6  
WASHER FLAT 3/8 ZINC  
WASHER LOCK M10  
SCREW HHC M10-1.25 X 20 G8.8  
BOOT, BATTERY CABLE  
BRACKET, BATTERY HOLD DOWN 1.5  
BATTERY POST COVER (RED+)  
BATTERY POSTCOVER (BLACK-)  
SCREW TH-FRM M6-1X16 N WA Z/JS  
WASHER SHAKEPROOF EXT 7/16 STL  
WASHER SHAKEPROOF EXT 5/16 STL  
®
46 Generac Power Systems, Inc.  
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Section 9 - Exploded Views and Parts  
Centurion Liquid-cooled 15 kW and 25 kW Generators  
Muffler — Drawing No. 0E0773-A  
10  
9
14  
8
15  
6
12  
13  
9
3
7
3
5
4
3
2
ITEM  
PART NO.  
QTY.  
DESCRIPTION  
1
2
3
0A4355  
0E2844  
036434  
036449  
0E0109  
0C1318  
0D8657  
0E0170  
0D9437  
060366  
039253  
022145  
022129  
045771  
0A8974  
027837  
1
1
3
3
1
1
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MANIFOLD EXHAUST 1.5L  
NIPPLE TOE 1.5NPTX5.5 BLK IRON  
BOLT U 5/16-18 X 2.09  
SADDLE 2 INCH  
PIPE,EXHAUST 1.5L STNDRD&ACSTC  
FLEX PIPE EXHAUST  
SUPPORT, RADIATOR 1.5L MITSU  
BLANKET, EXHAUST 1.5L MITSU  
MUFFLER,1.5L ACOUSTIC&STANDARD  
STRAP MUFFLER 6" DIA  
SCREW HHC M8-1.25 X 20 G8.8  
WASHER FLAT 5/16 ZINC  
WASHER LOCK M8-5/16  
NUT HEX M8-1.25 G8 YEL CHR  
CAP RAIN 2"  
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10  
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14  
15  
SCREW RHM 1/4-20 X 2-1/4  
®
Generac Power Systems, Inc. 47  
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Section 10 – Warranty  
Centurion Liquid-cooled 15 kW and 25 kW Generators  
CALIFORNIA EMISSION CONTROL WARRANTY STATEMENT  
YOUR WARRANTY RIGHTS AND OBLIGATIONS  
The California Air Resources Board (CARB) and Generac Power Systems, Inc. (Generac) are pleased to explain the Emission  
Control System Warranty on your new engine.* In California, new utility, and lawn and garden equipment engines must be  
designed, built and equipped to meet the state’s stringent anti-smog standards. Generac will warrant the emission control  
system on your engine for the periods of time listed below provided there has been no abuse, neglect, unapproved  
modification or improper maintenance of your engine.  
Your emission control system may include parts such as the carburetor, ignition system and exhaust system. Generac will  
repair your engine at no cost to you for diagnosis, replacement parts and labor, should a warrantable condition occur.  
MANUFACTURER’S EMISSION CONTROL SYSTEM WARRANTY COVERAGE:  
Emissions control systems on 1995 and later model year engines are warranted for two years as hereinafter noted. If, during  
such warranty period, any emission-related component or system on your engine is found to be defective in materials or  
workmanship, repairs or replacement will be performed by a Generac Authorized Warranty Service Facility.  
PURCHASER’S/OWNER’S WARRANTY RESPONSIBILITIES:  
As the engine purchaser/owner, you are responsible for the completion of all required maintenance as listed in your factory  
supplied Owner’s Manual. For warranty purposes, Generac recommends that you retain all receipts covering maintenance  
on your engine. However, Generac cannot deny warranty solely due to the lack of receipts or for your failure to ensure the  
completion of all scheduled maintenance.  
As the engine purchaser/owner, you should, however, be aware that Generac may deny any and/or all warranty coverage or  
responsibility if your engine, or a part/component thereof, has failed due to abuse, neglect , improper maintenance or  
unapproved modifications, or the use of counterfeit and/or “grey market” parts not made, supplied or approved by Generac.  
You are responsible for presenting your engine to a Generac Authorized Warranty Service Facility as soon as a problem  
occurs. The warranty repairs should be completed in a reasonable amount of time, not to exceed 30 days.  
Warranty service can be arranged by contacting either your selling dealer or a Generac Authorized Warranty Service Facility.  
To locate the Generac Authorized Warranty Service Facility nearest you, call our toll-free number:  
1-800-333-1322  
IMPORTANT NOTE: This warranty statement explains your rights and obligations under the Emission Control System  
Warranty (ECS Warranty), which is provided to you by Generac pursuant to California law. See also the “Generac Limited  
Warranties for Generac Power Systems, Inc.,” which is enclosed herewith on a separate sheet, also provided to you by  
Generac. The ECS Warranty applies only to the emission control system of your new engine. If there is any conflict in terms  
between the ECS Warranty and the Generac Warranty, the ECS Warranty shall apply except in circumstances where the  
Generac Warranty may provide a longer warranty period. Both the ECS Warranty and the Generac Warranty describe  
important rights and obligations with respect to your new engine.  
Warranty service can be performed only by a Generac Authorized Warranty Service Facility. When requesting warranty  
service, evidence must be presented showing the date of the sale to the original purchaser/owner.  
If you have any questions regarding your warranty rights and responsibilities, you should contact Generac at the  
following address:  
ATTENTION WARRANTY DEPARTMENT  
GENERAC POWER SYSTEMS, INC.  
P.O. BOX 297  
WHITEWATER, WI 53190  
Part 1  
®
48 Generac Power Systems, Inc.  
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Section 10 – Warranty  
Centurion Liquid-cooled 15 kW and 25 kW Generators  
EMISSION CONTROL SYSTEM WARRANTY  
Emission Control System Warranty (ECS Warranty) for 1995 and later model year engines:  
(a) Applicability: This warranty shall apply to 1995 and later model year engines. The ECS Warranty Period shall begin on  
the date the new engine or equipment is purchased by/delivered to its original, end-use purchaser/owner and shall  
continue for 24 consecutive months thereafter.  
(b) General Emissions Warranty Coverage: Generac warrants to the original, end-use purchaser/owner of the new engine or  
equipment and to each subsequent purchaser/owner that each of its engines is ...  
(1) Designed, built and equipped so as to conform with all applicable regulations adopted by the CARB pursuant to its  
authority, and  
(2) Free from defects in materials and workmanship which, at any time during the ECS Warranty Period, may cause a  
warranted emissions-related part to fail to be identical in all material respects to the part as described in the engine  
manufacturer’s application for certification.  
(c) The ECS Warranty only pertains to emissions-related parts on your engine, as follows:  
(1) Any warranted, emissions-related parts that are not scheduled for replacement as required maintenance in the Owner’s  
Manual shall be warranted for the ECS Warranty Period. If any such part fails during the ECS Warranty Period, it shall  
be repaired or replaced by Generac according to Subsection (4) below. Any such part repaired or replaced under the  
ECS Warranty shall be warranted for the remainder of the ECS Warranty Period.  
(2) Any warranted, emissions-related part that is scheduled only for regular inspection as specified in the Owner’s Manual  
shall be warranted for the ECS Warranty Period. A statement in such written instructions to the effect of “repair or  
replace as necessary” shall not reduce the ECS Warranty Period. Any such part repaired or replaced under the ECS  
Warranty shall be warranted for the remainder of the ECS Warranty Period.  
(3) Any warranted, emissions-related part that is scheduled for replacement as required maintenance in the Owner’s  
Manual shall be warranted for the period of time prior to the first scheduled replacement point for that part. If the part  
fails prior to the first scheduled replacement, the part shall be repaired or replaced by Generac according to Subsection  
(4) below. Any such emissions-related part repaired or replaced under the ECS Warranty shall be warranted for the  
remainder of the ECS Warranty Period prior to the first scheduled replacement point for such emissions-related part.  
(4) Repair or replacement of any warranted, emissions-related part under this ECS Warranty shall be performed at no  
charge to the owner at a Generac Authorized Warranty Service Facility.  
(5) When the engine is inspected by a Generac Authorized Warranty Service Facility, the owner shall not be held responsible  
for diagnostic costs if the repair is deemed warrantable.  
(6) Generac shall be liable for damages to other original engine components or approved modifications proximately caused  
by a failure under warranty of any emission-related part covered by the ECS Warranty.  
(7) Throughout the ECS Warranty Period, Generac shall maintain a supply of warranted emission-related parts sufficient  
to meet the expected demand for such emission-related parts.  
(8) Any Generac authorized and approved emission-related replacement part may be used in the performance of any ECS  
Warranty maintenance or repairs and will be provided without charge to the owner. Such use shall not reduce Generac  
ECS Warranty obligations.  
(9) Unapproved, add-on, modified, counterfeit and/or “grey market” parts may not be used to modify or repair a Generac  
engine. Such use voids this ECS Warranty and shall be sufficient grounds for disallowing an ECS Warranty claim.  
Generac shall not be held liable hereunder for failures of any warranted parts of a Generac engine caused by the use of  
such an unapproved, add-on, modified, counterfeit and/or “grey market” part.  
EMISSION RELATED PARTS INCLUDE THE FOLLOWING:  
1) Fuel Metering System:  
3) Ignition System including:  
a) Spark plug  
b) Ignition module  
1.2) LPG/Natural Gas carburetion assembly and its internal  
components.  
a) Fuel controller (if so equipped)  
4) Catalytic Muffler Assembly (if so equipped) including:  
a) Muffler gasket  
b) Exhaust manifold  
b) Mixer and its gaskets (if so equipped)  
c) Carburetor and its gaskets (if so equipped)  
d) Primary gas regulator (if so equipped)  
e) LP liquid vaporizer (if so equipped)  
5) Crankcase Breather Assembly including:  
a) Breather connection tube  
2) Air Induction System including:  
a) Intake pipe/manifold  
b) Air cleaner  
*Generac engine types covered by this warranty statement include the following:  
1) Prepackaged Standby Generator  
2) Auxiliary Power Unit (APU) Generator  
3) Standby Generator  
Part 2  
®
Generac Power Systems, Inc. 49  
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Section 10 – Warranty  
Centurion Liquid-cooled 15 kW and 25 kW Generators  
GENERAC POWER SYSTEMS "TWO YEAR" LIMITED WARRANTY FOR CENTURION  
"PREPACKAGED EMERGENCY AUTOMATIC STANDBY GENERATORS"  
For a period of two years from the date of original sale, Generac Power Systems, Inc. (Generac) will, at its option, repair or replace  
any part which, upon examination, inspection and testing by Generac or a Generac Authorized Warranty Service Dealer, is found to  
be defective under normal use and service, in accordance with the warranty schedule set forth below. Any equipment that the  
purchaser/owner claims to be defective must be examined by the nearest Generac Authorized Warranty Service Dealer. All  
transportation costs under the warranty, including return to the factory, are to be borne and prepaid by the purchaser/owner. This  
warranty applies only to Generac Centurion prepackaged emergency automatic standby generators sold and rated for use in  
"Standby" applications.  
WARRANTY SCHEDULE  
YEARS ONE and TWO - 100% (one hundred percent) transferable coverage on Labor and Part(s) listed (proof of purchase and  
maintenance is required):  
• Engine - All Components  
• Alternator - All Components  
Transfer System - All Components  
Steel enclosures are warranted against rusting for the first year of ownership only. Damage caused after receipt of generator is the  
responsibility of the owner and is not covered by this warranty. Nicks, srapes, dents or scratches to the painted enclosure should be  
repaired promptly by the owner.  
All warranty expense allowances are subject to the conditions defined in Generac's Warranty Policies, Procedures and Flat Rate  
Manual.  
THIS WARRANTY SHALL NOT APPLY TO THE FOLLOWING:  
• Generac Centurion generators that utilize non-Generac replacement parts.  
• Generac Centurion generators utilizing non-Generac transfer switches.  
• Repairs performed by individuals other than Centurion/Generac authorized dealers.  
• Any Generac Centurion generators used as rental or trailer mounted applications.  
• Air-cooled units used for prime power in place of existing utility power where utility power is present or in place of utility power  
where utility power service does not normally exist.  
• Steel enclosures that are rusting due to the improper installation, location in a harsh or saltwater environment or scratched where  
integrity of paint applied is compromised.  
• Costs of normal maintenance, adjustments, installation and start-up.  
• Failures caused by any contaminated fuels, oils, coolants or lack of proper fluid amounts.  
• Failures due, but not limited, to normal wear and tear, accident, misuse, abuse, negligence or improper installation. As with all  
mechanical devices, the Generac engines need periodic part(s) service and replacement to perform well. This warranty will not  
cover repair when normal use has exhausted the life of a part(s) or engine.  
• Failures caused by any external cause or act of God, such as collision, theft, vandalism, riot or wars, nuclear holocaust, fire,  
freezing, lightning, earthquake, windstorm, hail, volcanic eruption, water or flood, tornado or hurricane.  
• Damage related to rodent and/or insect infestation.  
• Products that are modified or altered in a manner not authorized by Generac in writing.  
• Any incidental, consequential or indirect damages caused by defects in materials or workmanship, or any delay in repair or  
replacement of the defective part(s).  
• Failure due to misapplication.  
Telephone, cellular phone, facsimile, internet access or other communication expenses.  
• Living or travel expenses of person(s) performing service, except as specifically included within the terms of a specific unit warranty  
period.  
• Expenses related to "customer instruction" or troubleshooting where no manufacturing defect is found.  
• Rental equipment used while warranty repairs are being performed.  
• Costs incurred for equipment used for removal and/or reinstallation of generator, (i.e., cranes, hoists, lifts, etc,)  
• Overnight freight costs for replacement part(s).  
• Overtime labor.  
• Starting batteries, fuses, light bulbs and engine fluids.  
THIS WARRANTY IS IN PLACE OF ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED. SPECIFICALLY, GENERAC MAKES  
NO OTHER WARRANTIES AS TO THE MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Some states do not  
allow limitations on how long an implied warranty lasts, so the above limitation may not apply to you.  
GENERAC'S ONLY LIABILITY SHALL BE THE REPAIR OR REPLACEMENT OF PART(S) AS STATED ABOVE. IN NO EVENT  
SHALL GENERAC BE LIABLE FOR ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES, EVEN IF SUCH DAMAGES ARE A  
DIRECT RESULT OF GENERAC'S NEGLIGENCE. Some states do not allow the exclusion or limitation of incidental or consequential  
damages, so the above limitation may not apply to you.  
This warranty gives you specific legal rights. You also have other rights from state to state.  
®
GENERAC POWER SYSTEMS, INC.  
P.O. BOX 297 • WHITEWATER, WI 53190  
Revision 10/01/04  
Part No. 0E5129  
Revision G (12/20/04)  
Printed in U.S.A.  
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