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
®
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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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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 “FULL” mark. 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 “FULL” MARK. 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 “FULL” MARK. 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.
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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.
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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.
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Section 6 — Notes
Centurion Liquid-cooled 15 kW and 25 kW Generators
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Section 7 - Installation Diagram
Centurion Liquid-cooled 15 kW and 25 kW Generators
Drawing No. 0E1533-A
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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
+
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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
DC-VR
3
1
2
4
5
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
0
0
14
CONNECTION
0
0
0
8
9
10
11
12
13
14
14
14
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
FS - FUEL SOLENOID
GRD - GROUND
LOS - LOW OIL PRESSURE SWITCH
SM - STARTER MOTOR
TO 120V/15A
CIRCUIT
BLACK
WHITE
WTS - WATER TEMPERATURE SWITCH
WLS - WATER LEVEL SENSOR
GREEN
TO
GOVERNOR
GOVERNOR
ACTUATOR
CONTROLLER
ACTUATOR
CONNECTOR
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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
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
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
6
14
5
7
13
6
6
4
9
5
15
15
7
6
10
11
16
18
17
20
3
9
10
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
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
9
8
15
6
13
3
7
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
1
1
1
2
4
4
4
4
1
2
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"
4
5
6
7
8
9
10
11
12
13
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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