Friedrich HAZARDGARG R 410A User Manual

2 0 1 0  
Hazardous Duty  
Room Air Conditioner  
R-410A Models  
Cool Only  
SH15M30A  
SH20M30A  
HG-ServMan (4-10)  
IMPORTANT SAFETY INFORMATION  
The information contained in this manual is intended for use by a qualified service technician who is familiar  
with the safety procedures required for installation and repair, and who is equipped with the proper tools and  
test instruments required to service this product.  
Installation or repairs made by unqualified persons can result in subjecting the unqualified person making  
such repairs as well as the persons being served by the equipment to hazards resulting in injury or electrical  
shock which can be serious or even fatal.  
Safety warnings have been placed throughout this manual to alert you to potential hazards that may be  
encountered. If you install or perform service on equipment, it is your responsibility to read and obey these  
warnings to guard against any bodily injury or property damage which may result to you or others.  
Your safety and the safety of others are very important.  
We have provided many important safety messages in this manual and on your appliance. Always read  
and obey all safety messages.  
This is a safety Alert symbol.  
This symbol alerts you to potential hazards that can kill or hurt you and others.  
All safety messages will follow the safety alert symbol with the word “WARNING”  
or “CAUTION”. These words mean:  
You can be killed or seriously injured if you do not follow instructions.  
WARNING  
You can receive minor or moderate injury if you do not follow instructions.  
CAUTION  
All safety messages will tell you what the potential hazard is, tell you how to reduce the chance of injury,  
and tell you what will happen if the instructions are not followed.  
A message to alert you of potential property damage will have the  
word “NOTICE”. Potential property damage can occur if instructions  
are not followed.  
NOTICE  
PERSONAL INJURY OR DEATH HAZARDS  
ELECTRICAL HAZARDS:  
Unplug and/or disconnect all electrical power to the unit before performing inspections,  
maintenance, or service.  
Make sure to follow proper lockout/tag out procedures.  
Always work in the company of a qualified assistant if possible.  
Capacitors, even when disconnected from the electrical power source, retain an electrical charge  
potential capable of causing electric shock or electrocution.  
Handle, discharge, and test capacitors according to safe, established, standards, and approved  
procedures.  
Extreme care, proper judgment, and safety procedures must be exercised if it becomes necessary  
to test or troubleshoot equipment with the power on to the unit.  
2
Do not spray or pour water on the return air grille, discharge air grille, evaporator coil, control panel,  
and sleeve on the room side of the air conditioning unit while cleaning.  
Electrical component malfunction caused by water could result in electric shock or other electrically  
unsafe conditions when the power is restored and the unit is turned on, even after the exterior is dry.  
Never operate the A/C unit with wet hands.  
Use air conditioner on a single dedicated circuit within the specified amperage rating.  
Use on a properly grounded outlet only.  
Do not remove ground prong of plug.  
Do not cut or modify the power supply cord.  
Do not use extension cords with the unit.  
Follow all safety precautions and use proper and adequate protective safety aids such as: gloves,  
goggles, clothing, adequately insulated tools, and testing equipment etc.  
Failure to follow proper safety procedures and/or these warnings can result in serious injury or death.  
REFRIGERATION SYSTEM HAZARDS:  
Use approved standard refrigerant recovering procedures and equipment to relieve pressure before  
opening system for repair.  
Do not allow liquid refrigerant to contact skin. Direct contact with liquid refrigerant can result in minor  
to moderate injury.  
Be extremely careful when using an oxy-acetylene torch. Direct contact with the torch’s flame or hot  
surfaces can cause serious burns.  
Make sure to protect personal and surrounding property with fire proof materials.  
Have a fire extinguisher at hand while using a torch.  
Provide adequate ventilation to vent off toxic fumes, and work with a qualified assistant whenever  
possible.  
Always use a pressure regulator when using dry nitrogen to test the sealed refrigeration system for  
leaks, flushing etc.  
Make sure to follow all safety precautions and to use proper protective safety aids such as: gloves,  
safety glasses, clothing etc.  
Failure to follow proper safety procedures and/or these warnings can result in serious injury or death.  
MECHANICAL HAZARDS:  
Extreme care, proper judgment and all safety procedures must be followed when testing,  
troubleshooting, handling, or working around unit with moving and/or rotating parts.  
Be careful when, handling and working around exposed edges and corners of sleeve, chassis, and  
other unit components especially the sharp fins of the indoor and outdoor coils.  
Use proper and adequate protective aids such as: gloves, clothing, safety glasses etc.  
Failure to follow proper safety procedures and/or these warnings can result in serious injury or death.  
3
PROPERTY DAMAGE HAZARDS  
FIRE DAMAGE HAZARDS:  
Read the Installation/Operation Manual for this air conditioning unit prior to operating.  
Use air conditioner on a single dedicated circuit within the specified amperage rating.  
Connect to a properly grounded outlet only.  
Do not remove ground prong of plug.  
Do not cut or modify the power supply cord.  
Do not use extension cords with the unit.  
Failure to follow these instructions can result in fire and minor to serious property damage.  
WATER DAMAGE HAZARDS:  
Improper installation maintenance, or servicing of the air conditioner unit, or not following the above  
Safety Warnings can result in water damage to personal items or property.  
Insure that the unit has a sufficient pitch to the outside to allow water to drain from the unit.  
Do not drill holes in the bottom of the drain pan or the underside of the unit.  
Failure to follow these instructions can result in result in damage to the unit and/or minor to serious  
property damage.  
INTRODUCTION  
This service manual is designed to be used in conjunction with the operation and installation manual provided  
with each unit.  
This service manual was written to assist the professional HVAC service technician to quickly and accurately  
diagnose and repair any malfunctions of this product.  
This manual, therefore, will deal with all subjects in a general nature. (i.e. All text will pertain to all models).  
IMPORTANT:  
It will be necessary for you to accurately identify the unit you are  
servicing, so you can be certain of a proper diagnosis and repair.  
(See Unit Identification.)  
Discharge Air Plenum  
Slot  
Tab  
Return Air Grille  
Slot  
Tab  
Latches  
Latch  
Return air grille  
4
UNIT IDeNTIfICATION  
Model Number Code  
S H 15 M 3 0 A  
8th Digit – Engineering  
Major change  
1st Digit – Function  
S = Straight Cool, Value Series  
7th Digit – Options  
0 = Straight Cool &  
H = HazardGard  
6th Digit – Voltage  
3 = 230-208 Volts  
3rd and 4th Digit - Approximate  
BTU/HR (Cooling)  
Heating BTU/Hr capacity listed in the  
Specifi cation/Performance Data Section  
5th Digit  
Alphabetical Modifier  
RAC Serial Number Identification Guide  
Serial Number  
Decade Manufactured  
A
K
A
R
00001  
L=0  
A=1  
B=2  
C=3  
D=4  
E=5  
F=6  
G=7  
H=8  
J=9  
Production Run Number  
Year Manufactured  
Product Line  
R = RAC  
A=1  
B=2  
C=3  
D=4  
E=5  
F=6  
G=7  
H=8  
J=9  
K=0  
Month Manufactured  
A=Jan D=Apr G=Jul K=Oct  
B=Feb E=May H=Aug L=Nov  
C=Mar F=Jun J=Sept M=Dec  
5
HAZARDGARD APPLICATION  
UL Listed for use in Class I, Division 2, Groups A, B, C  
and D hazardous locations.  
Hazardgard is speciꢀcally designed to cool living quarters, storage areas  
and other enclosures situated in hazardous locations, where speciꢀc volatile  
ꢁammable liquids or gases are handled or used within enclosed containers  
or systems.  
For more than 30 years, the Friedrich Hazardgard has endured some of the  
toughest and most unforgiving operating conditions imaginable. Time-tested  
in the ꢀeld where it counts, Hazardgard is trusted by professionals who have  
to get the job done. Robust engineering with design details like 33% thicker  
ꢀns extend the life of the coil. Diamonblue  
Technology, our anti-corrosive treatment,  
provides added endurance and protection  
in coastal or corrosive environments.  
Ideal applications  
Oꢂshore oil rigs, on-shore oil company  
ofꢀces and reꢀneries  
Ofꢀce complexes where methane is a  
by-product  
Petrochemical sites and propane ꢀll-up  
stations  
Hazardous materials storage  
Paint and varnish storage or processing  
plants  
Grain alcohol processors or storage sites  
Plant areas using strong solvents or  
chemicals  
Munitions plants or armories  
PVC or plastics plants and processing  
points  
Recycling plants  
Furniture reꢀnishing/stripping  
workshops  
Fertilizer plants  
| HAZARDOUS DUTY |  
6
SPeCIfICATIONS AND PeRfORMANCe DATA  
Cooling Performance Data  
EVAPORATOR AIR  
TEMP. DEG. F  
OPERATING  
PRESSURES  
BREAKER  
FUSE  
ELECTRICAL RATINGS  
Locked Rotor  
R-410A REF.  
Charge in OZ.  
CONDENSER  
TEMPERATURE  
DEG. F  
Discharge  
Temp  
Suction  
Temp  
Super  
Heat  
Sub-  
Cooling  
Voltage  
Discharge  
60 Hertz  
Amps  
Temp. Drop F.  
Suction  
Discharge Amps Cool Amps Heat  
Air  
54  
54  
Amps  
SH15M30A  
SH15M30A  
26  
26  
127  
185  
186  
124  
67  
68  
18  
15  
35  
38  
137  
137  
480  
485  
6.9  
9.1  
-
-
43  
50  
208 / 230  
208 / 230  
15  
15  
43  
42.7  
Speciꢀcations  
Energy  
Efꢀciency  
Ratio AHAM  
Moisture  
Removal  
Air Direction  
Controls  
Room Side Air  
Circulation  
Cooling Capacity  
(BTU/Hr.- AHAM)  
14500/14000  
Electrical Characteristics (60 Hertz)  
(Pints/ Hr.)  
6.0  
CFM  
375  
375  
Model  
Volts Rated  
230/208  
Amps AHAM  
6.9/7.4  
Watts  
EER  
SH15M30A  
SH20M30A  
1495/1443  
2074/2021  
9.7/9.7  
9.4/9.4  
8-way  
8-way  
19500/19000  
230/208  
9.1/10.0  
4.0  
Installation Information  
Circuit Rating  
Breaker or  
Dimensions  
(Inches)  
Window Width  
(Inches)  
Thru-The-Wall  
Finished Hole (Inches)  
Weight  
(Lbs.)  
T - D Fuse  
Depth  
Overall  
( A )  
Depth J Box  
to Louvers  
Minimum Minimum  
Extension Extension  
Model  
Height  
Width  
Into Room  
Outside  
Min. Max .  
Height  
Width Max. Depth  
Volts - Amps  
250V - 15A  
250V - 15A  
Net Shipping  
15  
15  
3
1
15  
7
3
3
/
/
/
/
/
/
/
/
SH15M30A  
SH20M30A  
15 16  
25 16  
27  
27  
8
6
6
3
3
16  
16 16  
27  
27  
8
42  
42  
16 16  
3
26 16  
3
6
6
156  
160  
168  
174  
15  
15  
3
1
/
15  
7
/
/
/
/
/
/
/
17 16  
25 16  
8
16  
16 16  
8
18 16  
26 16  
Due to continuing engineering research and technology, specifications are subject to change without notice. Manufactured under U.S. Design Patent  
DES 368, 306 decorative front; Utility Patent 5, 622, 058. MAXIMUM outdoor ambient operating temperature is 130°F. MAXIMUM TEMPERATURE  
RATING FOR CLASS I, DIVISION 2, GROUPS A,B,C,D.  
OPERATING TEMPERATURE CODE T3B  
( A )  
Max.  
Wall  
Depth  
STANDARD ON ALL M ODEL S.  
This advanced corrosion protection  
treatment protects the outdoor coil  
against deterioration and extends  
the life of the unit especially in harsh  
coastal environments.  
Junction  
Box  
Front  
SIDE VIEW  
7
7
eLeCTRICAL DATA  
WARNING  
ELECTRIC SHOCK HAZARD  
Turn off electric power before service or  
installation.  
All electrical connections and wiring MUST be  
installedbyaqualifiedelectricianandconformto  
the National Electrical Code and all local codes  
which have jurisdiction.  
Failure to do so can result in personal injury or  
death.  
NOTICE  
FIRE HAZARD  
Not following the above WARNING could result in fire or  
electrically unsafe conditions which could cause moderate  
or serious property damage.  
Read, understand and follow the above warning.  
eLeCTRICAL ReQUIReMeNTS  
ALL FIELD WIRING MUST MEET THE REQUIREMENTS OF THE NATIONAL ELECTRICAL CODE (ANSI/NFPA 70)  
ARTICLE 501.  
THE FIELD-PROVIDED CIRCUIT PROTECTION DEVICE (HACR CIRCUIT BREAKER OR TIME DELAY FUSE)  
MUST NOT EXCEED THE AMPACITY INDICATED ON THE PRODUCT NAMEPLATE.  
IMPORTANT: Before you begin the actual installation of your air conditioner, check local electrical codes and the  
information below.  
Your air conditioner must be connected to a power supply with the same A.C. voltage and frequency (hertz) as marked  
on the data plate located on the chassis. Only alternating current (A.C.), no direct current (D.C.), can be used.  
An overloaded circuit will invariably cause malfunction or failure of the air conditioner therefore, it is extremely important  
that the electrical power is adequate. Consult your power company if in doubt.  
Circuit Rating  
Time Delay Fuse  
Model Number  
Connection Type  
SH15  
Junction Box  
250V-15 Amp  
SH20  
Junction Box  
250V-15 Amp  
8
HAZARDGARD SPeCIAL feATUReS  
Permanent Split-Capacitor, totally enclosed fan motor  
to assure efficient operation even under adverse  
electrical conditions. Motor has a special stainless  
steel shaft to resist corrosion and a hermetically sealed  
overload for arc-free operation.  
Copper tubing/aluminum fin coils.  
Galvanized steel cabinet and base pan, all bonderized.  
Slide-out chassis for easy installation in window or  
through–the–wall.  
High capacity compressor with internal hermetically  
Extra insulation inside, including completely insulated  
plenum chamber for quieter, more efficient cooling.  
sealed overload.  
Solid-state relay contains transient voltage suppressor  
to protect controls against transient voltage spikes.  
Provides solid state switches for arc-free operation.  
Entire unit test run in environmental chamber before  
crating.  
Eight–way air flow control for uniform air circulation.  
Condensate drain with exclusive mosquito trap.  
Hot gas bypass low ambient control to permit operation  
without freezing at outdoor ambient temperatures as  
low as 45°F (7°C).  
15 amp circuit with time-delay fuse required.  
Accommodates direct wiring.  
Environmentally sealed on-off switch and gold plated  
contacts in thermostat for corrosion resistance.  
Long lasting 3/8” (10mm) thick air filter, germicidally  
treated, easily removed for cleaning.  
Electrodeposited epoxy primer and alkyd enamel, both  
oven-baked for an attractive, long-lasting finish.  
Friedrich Air Conditioning quality has been proven by more than 25 years of successful experience from the Gulf  
of Mexico to the searing sands of the Arabian desert.  
Control Panel  
Function Control (Power)  
This switch is a double pole, single throw toggle switch.  
ON - Turns everything on.  
OFF - Turns everything off.  
Temperature Control  
The knob at the bottom is the thermostat which is a cross  
ambient type used to maintain the desired comfort level.  
The thermostat reacts only to a change in temperature at  
the bulb location - turn the knob clockwise to set cooler,  
counterclockwise for warmer.  
exclusive  
Friedrich leads with the first UL Listed Room Air  
Conditioners designed to cool living quarters and other  
enclosures situated in hazardous locations where specific  
volatile flammable liquids or gases are handled or used with  
enclosed containers or systems. Friedrich Hazardgard  
room air conditioners are designed to meet the National  
Electrical Code, Article 500 requirements for Class  
I, Division 2, Groups A, B, C, D Hazardous locations,  
and are the only air conditioners UL Listed for this  
application. THIS UNIT IS LISTED BY UNDERWRITERS  
LABORATORIES FOR USE IN CLASS I, DIVISION  
2,GROUPS A, B, C, D HAZARDOUS LOCATIONS.  
Operating Temperature Code: T3B.  
9
COMPONeNT DefINITIONS  
A. Mechanical components  
Plenum assembly  
Diffuser with directional louvers used to direct the conditioned airflow.  
Blower wheel  
Attaches to the indoor side of the fan motor shaft and is used for distributing unconditioned, room side air through  
the heat exchanger and delivering conditioned air into the room.  
Slinger fan blade  
Attaches to the outdoor side of the fan motor shaft and is used to move outside air through the condenser coil, while  
slinging condensate water out of the base pan and onto the condenser coil, thus lowering the temperature and  
pressures within the coil.  
B. Electrical components  
Thermostat Control  
Used to maintain the specified room side comfort level.  
System Switch  
Used to regulate the operation of the fan motor and the compressor or to turn the unit off. For troubleshooting, refer  
to the wiring diagrams and schematics in the back of this service manual.  
Solid State Relay  
Used to energize the compressor and fan motor. Each unit has 2, 50 amp, 208/230 volt relays.  
Capacitor  
Reduces line current and steadies the voltage supply, while greatly improving the torque characteristics of the fan  
motor and compressor motor.  
Fan Motor  
Dual shafted fan motor operates the indoor blower wheel and the condenser fan blade simultaneously.  
C. Hermetic components  
Compressor  
Motorized device used to compress refrigerant through the sealed system.  
Low ambient bypass (hot gas bypass) valve  
Used for low ambient cooling operation, the valve is connected between the discharge line at the compressor and  
the suction process tube. It responds to suction pressure, whcih when reduced in the system, causes the valve to  
open and bypass hot gas from the high pressure side to the low pressure side of the system. The valve is preset  
to open when the suction pressure reaches 50 psig.  
Capillary tube  
A cylindrical meter device used to evenly distribute the flow of refrigerant to the heat exchangers (coils).  
10  
COMPONeNT TeSTING  
FAN MOTOR  
CAPACITORS  
A 230 volt single phase permanent split capacitor motor  
is used to drive the evaporator blower and condenser  
fan. A running capacitor is wired across the start and run  
terminals of the motor.  
WARNING  
ELECTRIC SHOCK HAZARD  
Turn off electric power before servicing.  
Discharge capacitor with a 20,000 Ohm 2 Watt  
resistor before handling.  
The motor is totally enclosed and is protected with a line  
volt-age overload located internally of the motor. The  
motor shaft is stainless steel to resist corrosion.  
Failure to do so may result in personal injury,  
or death.  
FAN MOTOR  
Many motor capacitors are internally fused. Shorting the  
terminals will blow the fuse, ruining the capacitor. A20,000  
ohm 2 watt resistor can be used to discharge capacitors  
safely. Remove wires from capacitor and place resistor  
across terminals. When checking a dual capacitor with  
a capacitor analyzer or ohmmeter, both sides must be  
tested.  
Capacitor  
Analyzer  
Check  
with  
Capacitor  
WARNING  
ELECTRIC SHOCK HAZARD  
The capacitor analyzer will show whether the capacitor  
is “open” or “shorted.” It will tell whether the capacitor  
is within its micro farads rating and it will show whether  
the capacitor is operating at the proper power-factor  
percentage. The instrument will automatically discharge  
the capacitor when the test switch is released.  
Disconnect power to the unit before  
servicing. Failure to follow this warning  
could result in serious injury or death.  
FAN MOTOR – TEST  
1. Determine that the capacitor is good.  
2. Perform continuity test on windings to determine if  
open, shorted or okay.  
Capacitor Connections  
The starting winding of a motor can be damaged by a  
shorted and grounded running capacitor. This damage  
usually can be avoided by proper connection of the  
running capacitor terminals.  
SOLID STATE RELAY  
Two 50 amp rated 208/230 volt solid state relays are used  
to energize the compressor and fan motor. Terminals 3  
and 4 are the 208/230 volt line side. Terminals 1 and 2  
are load side contacts.  
From the supply line on a typical 230 volt circuit, a 115 volt  
potential exists from the “R” terminal to ground through a  
possible short in the capacitor. However, from the “S” or  
start terminal, a much higher potential, possibly as high as  
400 volts, exists because of the counter EMF generated  
in the start winding. Therefore, the possibility of capacitor  
failure is much greater when the identified terminal is  
connected to the “S” or start terminal. The identified  
terminal should always be connected to the supply line, or  
“R” terminal, never to the “S” terminal.  
Line side  
SOLID STATE  
RELAY  
Load  
side  
LED indicates  
contacts closed  
when lit  
When connected properly, a shorted or grounded running  
capacitor will result in a direct short to ground from the “R”  
terminal and will blow the line fuse. The motor protector will  
protect the main winding from excessive temperature.  
SYSTEM CONTROL SWITCH  
This switch is double pole, single throw. Check for  
continuity between terminals 2 and 3, and 5 and 6.  
SWITCH, ON-OFF  
11  
THERMOSTAT  
LOW AMBIENT BYPASS VALVE  
A cross ambient thermostat is used to maintain the  
desired comfort level. The thermostat reacts only to a  
change in temperature at the bulb location. Important to  
the successful operation of the unit is the position of the  
sensing bulb in relation to the evaporator.  
WARNING  
HIGH PRESSURE HAZARD  
Sealed Refrigeration System contains  
refrigerant and oil under high pressure.  
Propersafetyproceduresmustbefollowed,  
and proper protective clothing must be  
worn when working with refrigerants.  
SENSING  
BULB LOCATION  
Failure to follow these procedures could  
result in serious injury or death.  
The HazardGard unit is designed to operate at low outside  
ambient temperatures. This is accomplished by the use  
of a bypass valve installed in the refrigeration circuit.  
The valve is connected between the discharge line at  
the compressor and the suction process tube. The valve  
responds to suction pressure which, when reduced in the  
system, causes the valve to open and bypass hot gas  
from the high pressure side to the low pressure side of  
the system. The hot gas entering the compressor mixes  
with the cool gas returned through the suction line, thus  
increasing the suction pressure. The valve is preset to  
open when the suction pressure reaches 50 psig. This  
pressure setting cannot be altered. The system can be  
operated at outdoor temperatures as low as 45°F before  
the evaporator coil will begin to accumulate frost.  
RANGE: Thermostat  
(Part No. 618-225-02)  
60° F ( ± 2° ) to 90° F( ± 4° )  
WARNING  
ELECTRIC SHOCK HAZARD  
Disconnect power to the unit before  
servicing. Failure to follow this warning  
could result in serious injury or death.  
To determine if the valve operates, block the return air to  
the evaporator coil. Turn on the unit and touch the tube  
at the bypass valve outlet which connects to the suction  
process tube. When the low side pressure reaches  
approximately 50 psig, the valve will begin to open and  
the tube will get hot. This method will determine if the  
valve is responding to the suction pressure change.  
TESTING THE THERMOSTAT  
Remove the wires from the thermostat. Turn the  
thermostat to its coldest position. Check to see if there is  
continuity between the two terminals. Turn the thermostat  
to its warmest position. Check continuity to see if the  
thermostat contacts open.  
LOW AMBIENT  
BYPASS VALVE  
Note: The temperature must be within the range listed to  
check the thermostat. Refer to the troubleshooting section  
in this manual for additional information on thermostat  
testing.  
12  
R-410A SeALeD SYSTeM RePAIR CONSIDeRATIONS  
WARNING  
Refrigeration system under high pressure  
Do not puncture, heat, expose to flame or incinerate.  
Only certified refrigeration technicians should  
service this equipment.  
R410Asystems operate at higher pressures than  
R22 equipment.Appropriate safe service and  
handling practicces must be used.  
Only use gauge sets designed for use with R410A.  
Do not use standard R22 gauge sets.  
The following is a list of important considerations when working with R-410A equipment  
R-410A pressure is approximately 60% higher than R-22 pressure.  
R-410A cylinders must not be allowed to exceed 125 F, they may leak or rupture.  
R-410A must never be pressurized with a mixture of air, it may become  
flammable.  
Servicing equipment and components must be specifically designed for use with R-410A and  
dedicated to prevent contamination.  
Manifold sets must be equipped with gauges capable of reading 750 psig (high side) and 200  
psig (low side), with a 500-psig low-side retard.  
Gauge hoses must have a minimum 750-psig service pressure rating  
Recovery cylinders must have a minimum service pressure rating of 400 psig, (DOT 4BA400  
and DOT BW400 approved cylinders).  
POE (Polyol-Ester) lubricants must be used with R-410A equipment.  
To prevent moisture absorption and lubricant contamination, do not leave the refrigeration  
system open to the atmosphere longer than 1 hour.  
Weigh-in the refrigerant charge into the high side of the system.  
Introduce liquid refrigerant charge into the high side of the system.  
For low side pressure charging of R-410A, use a charging adaptor.  
Use Friedrich approved R-410A filter dryers only.  
13  
R-410A SeALeD RefRIGeRATION SYSTeM RePAIRS  
IMPORTANT  
SEALED SYSTEM REPAIRS TO COOL-ONLY MODELS REQUIRE THE INSTALLATION OF A LIQUID LINE DRIER.  
EQUIPMENT REQUIRED:  
9. High Pressure Gauge - (0 to 750 lbs.)  
10. Low Pressure Gauge - (-30 to 200 lbs.)  
11. Vacuum Gauge - (0 - 1000 microns)  
1. Voltmeter  
2. Ammeter  
3. Ohmmeter  
12. Facilities for flowing nitrogen through refrigeration tubing  
4. E.P.A. Approved Refrigerant Recovery System  
during all brazing processes.  
5. Vacuum Pump (capable of 200 microns or less  
vacuum.)  
EQUIPMENT MUST BE CAPABLE OF:  
6. Acetylene Welder  
1. Recovering refrigerant to EPA required levels.  
7. Electronic Halogen Leak Detector capable of  
detecting HFC (Hydrofluorocarbon) refrigerants.  
2. Evacuation from both the high side and low side of the  
system simultaneously.  
8. Accurate refrigerant charge measuring device such  
as:  
3. Introducing refrigerant charge into high side of the  
system.  
a. Balance Scales - 1/2 oz. accuracy  
b. Charging Board - 1/2 oz. accuracy  
4. Accurately weighing the refrigerant charge introduced  
into the system.  
Proper refrigerant charge is essential to proper unit operation.  
Operating a unit with an improper refrigerant charge will  
result in reduced performance (capacity) and/or efficiency.  
Accordingly, the use of proper charging methods during  
servicing will insure that the unit is functioning as designed  
and that its compressor will not be damaged.  
WARNING  
RISK OF ELECTRIC SHOCK  
Unplug and/or disconnect all electrical power  
to the unit before performing inspections,  
maintenances or service.  
Failure to do so could result in electric shock,  
serious injury or death.  
Too much refrigerant (overcharge) in the system is just as bad  
(if not worse) than not enough refrigerant (undercharge). They  
both can be the source of certain compressor failures if they  
remain uncorrected for any period of time. Quite often, other  
problems (such as low air flow across evaporator, etc.) are  
misdiagnosed as refrigerant charge problems. The refrigerant  
circuit diagnosis chart will assist you in properly diagnosing  
these systems.  
WARNING  
HIGH PRESSURE HAZARD  
SealedRefrigerationSystemcontainsrefrigerant  
and oil under high pressure.  
An overcharged unit will at times return liquid refrigerant  
(slugging) back to the suction side of the compressor eventually  
causing a mechanical failure within the compressor. This  
mechanical failure can manifest itself as valve failure, bearing  
failure, and/or other mechanical failure. The specific type of  
failure will be influenced by the amount of liquid being returned,  
and the length of time the slugging continues.  
Proper safety procedures must be followed,  
and proper protective clothing must be worn  
when working with refrigerants.  
Failure to follow these procedures could  
result in serious injury or death.  
Refrigerant Charging  
Not enough refrigerant (undercharge) on the other hand, will  
cause the temperature of the suction gas to increase to the point  
where it does not provide sufficient cooling for the compressor  
motor. When this occurs, the motor winding temperature will  
increase causing the motor to overheat and possibly cycle open  
the compressor overload protector. Continued overheating of  
the motor windings and/or cycling of the overload will eventually  
lead to compressor motor or overload failure.  
NOTE: Because the HazardGard system is a sealed system,  
service process tubes will have to be installed. First install a  
line tap and remove refrigerant from system. Make necessary  
sealed system repairs and vacuum system. Crimp process  
tube line and solder end shut. Do not leave a service valve in  
the sealed system.  
14  
Method Of Charging / Repairs  
The acceptable method for charging the HazardGard system  
is the Weighed in Charge Method. The weighed in charge  
method is applicable to all units. It is the preferred method to  
use, as it is the most accurate.  
The weighed in method should always be used whenever  
a charge is removed from a unit such as for a leak repair,  
compressor replacement, or when there is no refrigerant  
charge left in the unit. To charge by this method, requires the  
following steps:  
1. Install a piercing valve to remove refrigerant from the  
sealedsystem. (Piercing valve must be removed from the  
system before recharging.)  
2. Recover Refrigerant in accordance with EPA regulations.  
WARNING  
BURN HAZARD  
Proper safety procedures must be followed,  
and proper protective clothing must be worn  
when working with a torch.  
Failure to follow these procedures could  
result in moderate or serious injury.  
3. Install a process tube to sealed system.  
CAUTION  
FREEZE HAZARD  
Proper safety procedures must be followed,  
and proper protective clothing must be worn  
when working with liquid refrigerant.  
Failure to follow these procedures could  
result in minor to moderate injury.  
4. Make necessary repairs to system.  
5. Evacuate system to 200 microns or less.  
6. Weigh in refrigerant with the proper quantity of R-410A  
refrigerant.  
7. Start unit, and verify performance.  
WARNING  
BURN HAZARD  
Proper safety procedures must be followed,  
and proper protective clothing must be worn  
when working with a torch.  
Failure to follow these procedures could  
result in moderate or serious injury.  
8. Crimp the process tube and solder the end shut.  
15  
WARNING  
WARNING  
ELECTRIC SHOCK HAZARD  
Turn off electric power before service or  
installation.  
HIGH PRESSURE HAZARD  
SealedRefrigerationSystemcontainsrefrigerant  
and oil under high pressure.  
Extreme care must be used, if it becomes  
necessary to work on equipment with power  
applied.  
Proper safety procedures must be followed,  
and proper protective clothing must be worn  
when working with refrigerants.  
Failure to do so could result in serious injury or  
death.  
Failure to follow these procedures could  
result in serious injury or death.  
Undercharged Refrigerant Systems  
An undercharged system will result in poor performance  
(low pressures, etc.) in both the heating and cooling  
cycle.  
A check of the amperage drawn by the compressor  
motor should show a lower reading. (Check the Unit  
Specification.) After the unit has run 10 to 15 minutes,  
check the gauge pressures. Gauges connected to system  
with an undercharge will have low head pressures and  
substantially low suction pressures.  
Whenever you service a unit with an undercharge of  
refrigerant, always suspect a leak. The leak must be  
repaired before charging the unit.  
To check for an undercharged system, turn the unit on,  
allow the compressor to run long enough to establish  
working pressures in the system (15 to 20 minutes).  
During the cooling cycle you can listen carefully at the exit  
of the metering device into the evaporator; an intermittent  
hissing and gurgling sound indicates a low refrigerant  
charge. Intermittent frosting and thawing of the evaporator  
is another indication of a low charge, however, frosting  
and thawing can also be caused by insufficient air over  
the evaporator.  
Checks for an undercharged system can be made at  
the compressor. If the compressor seems quieter than  
normal, it is an indication of a low refrigerant charge.  
of the evaporator will not be encountered because the  
refrigerant will boil later if at all. Gauges connected to  
system will usually have higher head pressure (depending  
upon amount of over charge). Suction pressure should be  
slightly higher.  
Overcharged Refrigerant Systems  
Compressor amps will be near normal or higher.  
Noncondensables can also cause these symptoms. To  
confirm, remove some of the charge, if conditions improve,  
system may be overcharged. If conditions don’t improve,  
Noncondensables are indicated.  
Whenever an overcharged system is indicated, always  
make sure that the problem is not caused by air flow  
problems. Improper air flow over the evaporator coil may  
indicate some of the same symptoms as an over charged  
system.  
An overcharge can cause the compressor to fail, since it  
would be “slugged” with liquid refrigerant.  
Thechargeforanysystemiscritical. Whenthecompressor  
is noisy, suspect an overcharge, when you are sure that  
the air quantity over the evaporator coil is correct. Icing  
16  
Restricted Refrigerant System  
Troubleshooting a restricted refrigerant system can be  
difficult. The following procedures are the more common  
problems and solutions to these problems. There are two  
types of refrigerant restrictions: Partial restrictions and  
complete restrictions.  
at the metering device entrance to the evaporator. The  
evaporator in a partial restriction could be partially frosted  
or have an ice ball close to the entrance of the metering  
device. Frost may continue on the suction line back to the  
compressor.  
A partial restriction allows some of the refrigerant to  
circulate through the system.  
Often a partial restriction of any type can be found by feel,  
as there is a temperature difference from one side of the  
restriction to the other.  
With a complete restriction there is no circulation of  
refrigerant in the system.  
With a complete restriction, there will be no sound at the  
metering device entrance. An amperage check of the  
compressor with a partial restriction may show normal  
current when compared to the unit specification. With a  
complete restriction the current drawn may be considerably  
less than normal, as the compressor is running in a deep  
vacuum (no load.) Much of the area of the condenser will  
be relatively cool since most or all of the liquid refrigerant  
will be stored there.  
Restricted refrigerant systems display the same symptoms  
as a “low-charge condition.”  
When the unit is shut off, the gauges may equalize very  
slowly.  
Gauges connected to a completely restricted system will  
run in a deep vacuum. When the unit is shut off, the gauges  
will not equalize at all.  
The following conditions are based primarily on a system  
in the cooling mode.  
A quick check for either condition begins at the evaporator.  
With a partial restriction, there may be gurgling sounds  
17  
COMPReSSOR CHeCKS  
WARNING  
ELECTRIC SHOCK HAZARD  
WARNING  
ELECTRIC SHOCK HAZARD  
Turn off electric power before service or  
installation. Extreme care must be used, if it  
becomes necessary to work on equipment with  
power applied.  
Disconnect power to the unit before  
servicing. Failure to follow this warning  
could result in serious injury or death.  
Failure to do so could result in serious injury or  
death.  
INTERNAL OVERLOAD  
The compressors are equipped with an internal overload.  
The overload is embedded in the motor windings to sense  
the winding temperature and/or current draw. The overload  
is connected in series with the common motor terminal  
Locked Rotor Voltage (L.R.V.) Test  
Locked rotor voltage (L.R.V.) is the actual voltage available  
at the compressor under a stalled condition.  
Should the internal temperature and/or current draw become  
excessive, the contacts in the overload will open, turning off  
the compressor. The overload will automatically reset, but  
may require several hours before the heat is dissipated.  
Single Phase Connections  
Disconnect power from unit. Using a voltmeter, attach one  
lead of the meter to the run “R” terminal on the compressor  
and the other lead to the common “C” terminal of the com-  
pressor. Restore power to unit.  
CHECKING THE INTERNAL OVERLOAD  
Internal Overload  
Determine L.R.V.  
Start the compressor with the volt meter attached; then stop  
the unit. Attempt to restart the compressor within a couple  
of seconds and immediately read the voltage on the meter.  
The compressor under these conditions will not start and will  
usually kick out on overload within a few seconds since the  
pressures in the system will not have had time to equalize.  
Voltage should be at or above minimum voltage of 197 VAC,  
as specified on the rating plate. If less than minimum, check  
for cause of inadequate power supply; i.e., incorrect wire  
size, loose electrical connections, etc.  
Amperage (L.R.A.) Test  
The running amperage of the compressor is the most impor-  
tant of these readings. A running amperage higher than that  
indicated in the performance data indicates that a problem  
exists mechanically or electrically.  
1. With no power to unit, remove the leads from the com-  
pressor terminals.  
Single Phase Running and L.R.A. Test  
2. Using an ohmmeter, test continuity between terminals  
C-S and C-R. If no continuity, the compressor overload  
is open and the compressor must be replaced.  
NOTE: Consult the specification and performance section  
for running amperage. The L.R.A. can also be found on the  
rating plate.  
WARNING  
ELECTRIC SHOCK HAZARD  
Turn off electric power before service or  
installation. Extreme care must be used, if it  
becomes necessary to work on equipment with  
power applied.  
Failure to do so could result in serious injury or  
death.  
Select the proper amperage scale and clamp the meter  
probe around the wire to the “C” terminal of the compressor.  
Turn on the unit and read the running amperage on the me-  
ter. If the compressor does not start, the reading will indicate  
the locked rotor amperage (L.R.A.).  
18  
Single Phase Resistance Test  
COMPReSSOR RePLACeMeNT  
Remove the leads from the compressor terminals and set  
Recommendedprocedure forcompressor  
replacement  
the ohmmeter on the lowest scale (R x 1).  
Touch the leads of the ohmmeter from terminals common  
to start (“C” to “S”). Next, touch the leads of the ohmmeter  
from terminals common to run (“C” to “R”).  
WARNING  
RISK OF ELECTRIC SHOCK  
Unplug and/or disconnect all electrical power  
to the unit before performing inspections,  
maintenances or service.  
Add values “C” to “S” and “C” to “R” together and  
check resistance from start to run terminals (“S” to “R”).  
Resistance “S” to “R” should equal the total of “C” to “S”  
and “C” to “R.”  
Failure to do so could result in electric shock,  
serious injury or death.  
In a single phase PSC compressor motor, the highest  
value will be from the start to the run connections (“S” to  
“R”). The next highest resistance is from the start to the  
common connections (“S” to “C”). The lowest resistance  
is from the run to common. (“C” to “R”) Before replacing a  
compressor, check to be sure it is defective.  
1. Be certain to perform all necessary electrical and  
refrigeration tests to be sure the compressor is  
actually defective before replacing.  
WARNING  
HIGH PRESSURE HAZARD  
SealedRefrigerationSystemcontainsrefrigerant  
and oil under high pressure.  
Check the complete electrical system to the compressor  
and compressor internal electrical system, check to be  
certain that compressor is not out on internal overload.  
Complete evaluation of the system must be made  
when ever you suspect the compressor is defective.  
If the compressor has been operating for sometime, a  
careful examination must be made to determine why the  
compressor failed.  
Proper safety procedures must be followed,  
and proper protective clothing must be worn  
when working with refrigerants.  
Failure to follow these procedures could  
result in serious injury or death.  
2. Recover all refrigerant from the system though  
the process tubes. PROPER HANDLING OF  
RECOVERED REFRIGERANT ACCORDING TO  
EPA REGULATIONS IS REQUIRED. Do not use  
gauge manifold for this purpose if there has been  
a burnout. You will contaminate your manifold and  
hoses. Use a Schrader valve adapter and copper  
tubing for burnout failures.  
WARNING  
HIGH TEMPERATURES  
Extreme care, proper judgment and all safety  
procedures must be followed when testing,  
troubleshooting, handling or working around  
unit while in operation with high temperature  
components. Wear protective safety aids  
such as: gloves, clothing etc.  
Many compressor failures are caused by the following  
conditions:  
1. Improper air flow over the evaporator.  
2. Overcharged refrigerant system causing liquid to be  
returned to the compressor.  
Failure to do so could result in serious burn  
injury.  
3. Restricted refrigerant system.  
4. Lack of lubrication.  
NOTICE  
FIRE HAZARD  
5. Liquid refrigerant returning to compressor causing oil  
to be washed out of bearings.  
The use of a torch requires extreme care and proper  
judgment. Follow all safety recommended precautions  
and protect surrounding areas with fire proof materials.  
Have a fire extinguisher readily available. Failure to follow  
this notice could result in moderate to serious property  
damage.  
6. Noncondensables such as air and moisture in  
the system. Moisture is extremely destructive to a  
refrigerant system.  
19  
3. After all refrigerant has been recovered, disconnect  
suction and discharge lines from the compressor and  
remove compressor. Be certain to have both suction  
and discharge process tubes open to atmosphere.  
SPECIAL PROCEDURE IN THE CASE OF MOTOR  
COMPRESSOR BURNOUT  
WARNING  
ELECTRIC SHOCK HAZARD  
Turn off electric power before service or  
installation.  
4. Carefully pour a small amount of oil from the suction  
stub of the defective compressor into a clean  
container.  
5. Using an acid test kit (one shot or conventional kit), test  
the oil for acid content according to the instructions  
with the kit.  
Failure to do so may result in personal injury,  
or death.  
6. If any evidence of a burnout is found, no matter how  
slight, the system will need to be cleaned up following  
proper procedures.  
WARNING  
HIGH PRESSURE HAZARD  
SealedRefrigerationSystemcontainsrefrigerant  
and oil under high pressure.  
7. Install the replacement compressor.  
Proper safety procedures must be followed,  
and proper protective clothing must be worn  
when working with refrigerants.  
WARNING  
EXPLOSION HAZARD  
The use of nitrogen requires a pressure  
regulator. Follow all safety procedures and  
wear protective safety clothing etc.  
Failure to follow these procedures could  
result in serious injury or death.  
Failure to follow proper safety procedures  
result in serious injury or death.  
WARNING  
EXPLOSION HAZARD  
8. Pressurize with a combination of R-410A and nitrogen  
and leak test all connections with an electronic or  
Halide leak detector. Recover refrigerant and repair  
any leaks found.  
The use of nitrogen requires a pressure  
regulator. Follow all safety procedures and  
wear protective safety clothing etc.  
Failure to follow proper safety procedures  
result in serious injury or death.  
Repeat Step 8 to insure no more leaks are present.  
9. Evacuate the system with a good vacuum pump capable  
of a final vacuum of 200 microns or less. The system  
should be evacuated through both liquid line and suction  
line gauge ports. While the unit is being evacuated, seal  
all openings on the defective compressor. Compressor  
manufacturers will void warranties on units received not  
properly sealed. Do not distort the manufacturers tube  
connections.  
1.  
2.  
Recover all refrigerant and oil from the system.  
Remove compressor, capillary tube and filter drier  
from the system.  
3.  
Flush evaporator condenser and all connecting  
tubing with dry nitrogen or equivalent. Use approved  
flushing agent to remove all contamination from  
system. Inspect suction and discharge line for  
carbon deposits. Remove and clean if necessary.  
Ensure all acid is neutralized.  
CAUTION  
FREEZE HAZARD  
Proper safety procedures must be followed,  
and proper protective clothing must be worn  
when working with liquid refrigerant.  
4. Reassemble the system, including new drier strainer  
and capillary tube.  
5. Proceed with step 8-10 on previous section.  
Failure to follow these procedures could  
result in minor to moderate injury.  
10. Recharge the system with the correct amount of  
refrigerant. The proper refrigerant charge will be  
found on the unit rating plate. The use of an accurate  
measuring device, such as a charging cylinder,  
electronic scales or similar device is necessary.  
20  
ROUTINe MAINTeNANCe  
AIR FILTER  
WARNING  
Clean the unit air intake filter at least every 300 to 350 hours  
of operation. Clean the filters with a mild detergent in warm  
water and allow to dry thoroughly before reinstalling.  
ELECTRIC SHOCK HAZARD  
Turn off electric power before inspections,  
maintenances, or service.  
COILS AND BASE PAN  
Extreme care must be used, if it becomes  
necessary to work on equipment with power  
applied.  
The indoor coil (evaporator coil), the outdoor coil (condenser  
coil) and base pan should be inspected periodically  
(yearly or bi-yearly) and cleaned of all debris (lint, dirt,  
leaves, paper, etc.). Clean the coils and base pan with a soft  
brush and compressed air or vacuum. If using a pressure  
washer, be careful not to bend the aluminium fin pack. Use  
a sweeping up and down motion in the direction of the verti-  
cal aluminum fin pack when pressure cleaning coils. Cover  
all electrical components to protect them from water or spray.  
Allow the unit to dry thoroughly before reinstalling it in the  
sleeve.  
Failure to do so could result in serious injury  
or death.  
WARNING  
EXCESSIVE WEIGHT HAZARD  
Use two people to lift or carry the unit, and wear  
proper protective clothing.  
BLOWER WHEEL / HOUSING / CONDENSER FAN /  
SHROUD  
Failure to do so may result in personal injury.  
Inspect the indoor blower housing, evaporator blade, con-  
denser fan blade and condenser shroud periodically (yearly  
or bi-yearly) and clean of all debris (lint, dirt, mold, fungus,  
etc.). Clean the blower housing area and blower wheel with  
an antibacterial / antifungal cleaner. Use a biodegradable  
cleaning agent and degreaser on condenser fan and con-  
denser shroud. Use warm or cold water when rinsing these  
items. Allow all items to dry thoroughly before reinstalling  
them.  
WARNING  
CUT/SEVER HAZARD  
Be careful with the sharp edges and corners.  
Wear protective clothing and gloves, etc.  
Failure to do so could result in serious injury.  
ELECTRONIC / ELECTRICAL / MECHANICAL  
NOTICE  
Units are to be inspected and serviced by qualified service  
personnel only. Use proper protection on surrounding  
property. Failure to follow this notice could result in  
moderate or serious property damage.  
Periodically (at least yearly or bi-yearly): inspect all control  
components: electronic, electrical and mechanical, as well as  
the power supply. Use proper testing instruments (voltmeter,  
ohmmeter, ammeter, wattmeter, etc.) to perform electrical  
tests. Use an air conditioning or refrigeration thermometer  
to check room, outdoor and coil operating temperatures.  
Use an electronic tester to measure wet bulb temperatures  
indoors and outdoors.  
NOTICE  
Do not use a caustic coil cleaning agent on coils or base  
pan. Use a biodegradable cleaning agent and degreaser,  
to prevent damage to the coil and/or base pan.  
21  
ROUTINe MAINTeNANCe (Continued)  
NOTICE  
Do not drill holes in the bottom of the drain pan or the  
underside of the unit. Not following this notice could  
result in damage to the unit or condensate water leaking  
inappropriately which could cause water damage to  
surrounding property.  
SLEEVE / DRAIN  
Inspect the sleeve and drain system periodically (at least yearly or bi-yearly) and clean of all obstructions and  
debris. Clean both areas with an antibacterial and antifungal cleaner. Rinse both items thoroughly with water and  
ensure that the drain outlets are operating correctly. Check the sealant around the sleeve and reseal areas as  
needed.  
FRONT COVER  
Clean the front cover when needed. Use a mild detergent. Wash and rinse with warm water. Allow it to dry  
thoroughly before reinstalling it in the chassis.  
CLEARANCES  
Inspect the surrounding area (inside and outside) to ensure that the unit’s clearances have not been compromised or  
altered.  
Discharge Air Plenum  
Slot  
Tab  
Return Air Grille  
Slot  
Tab  
Latches  
Latch  
Return air grille  
22  
ROOM AIR CONDITIONeR UNIT  
PeRfORMANCe TeST DATA SHeeT  
DATE: _______________ MODEL:_______________ SERIAL:________________  
YES  
____  
____  
____  
NO  
IS THERE A FRIEDRICH SLEEVE INSTALLED?  
IS THERE A FRIEDRICH OUTDOOR GRILL INSTALLED?  
IS MAINTENANCE BEING PERFORMED?  
____  
____  
____  
If NO is checked use back of sheet for explanation  
ELECTRICAL:  
LINE VOLTAGE (STATIC)  
START UP VOLTAGE  
AMPERAGE DRAW  
--------- VOLTS  
--------- VOLTS  
--------- AMPS (COOL)  
--------- AMPS (HEAT)  
AMPERAGE DRAW  
COMPRESSOR  
LOCKED ROTOR AMPS  
RUNNING AMPERAGE DRAW  
--------- AMPS  
--------- AMPS  
INDOOR TEMPERATURES:  
INDOOR AMBIENT TEMPERATURE  
RELATIVE HUMIDITY (RH) INDOOR  
-------- F  
-------- %  
COOL  
HEAT  
DISCHARGE AIR TEMPERATURE (INDOOR)  
RETURN AIR TEMPERATURE (INDOOR)  
---------- F --------- F  
---------- F --------- F  
OUTDOOR TEMPERATURE:  
OUTDOOR AMBIENT TEMPERATURE  
RH OUTDOOR  
--------- F  
--------- %  
DISCHARGE AIR TEMPERATURE (OUTDOOR)  
INTAKE AIR TEMPERATURE (OUTDOOR  
--------- F ---------- F  
--------- F ---------- F  
APPLICATION USE ------------------------- ROOM (RESIDENTIAL OR COMMERCIAL)  
COOLING OR HEATING AREA W ---------- X L ----------- X H ----------- = SQ/CU/FT ------------  
This is a general guide.  
Please consult manual J or M for exact load calculations.  
Due to variations in room design, climate zone and occupancy, larger areas  
may require the use of multiple units to provide the optimal cooling solution.  
23  
TROUBLESHOOTING  
Problem  
Possible Cause  
Possible Solution  
Check power source.  
Power disconnected.  
Replace fuse, reset breaker. If repeats, check fuse  
or breaker size. Check for shorts in unit wiring and  
components.  
Branch circuit fuse blown or circuit  
breaker tripped.  
Unit does not run  
Loose or disconnected wiring at  
switch.  
Check wiring & connections. Connect per wiring  
diagram.  
Test for continuity, 3 and 2, 5 and 6. If bad,  
replace.  
Inoperative switch (On-Off).  
Problem  
Possible Cause  
Possible Solution  
Dirty filter.  
Clean as recommended in Owner's Manual.  
Check for dirty or obstructed coil clean as  
required.  
Restricted airflow.  
Inoperative thermostat.  
Short of refrigerant.  
Test for shorted thermostat or stuck contacts.  
De-ice coil and check for leak.  
Evaporator coil  
freezes up  
De-ice coil. Check temperature differential  
across coil. Touch-test coil return bends for same  
temperature. Test for low running current.  
Partially restricted capillary.  
Inoperative fan motor.  
Test fan motor & replace if inoperative.  
Problem  
Possible Cause  
Possible Solution  
Excessive heat load.  
Test cooling performance of unit. Unit undersized.  
Check for partially iced coil. Check temperature  
split across coil.  
Restriction in line.  
Refrigerant leak.  
Compressor runs  
continually. Does  
not cycle off.  
Check for presence of oil on silver soldered  
connections. Check for partially iced coil. Check  
split across coil. Check for low running amperage.  
Check operation of thermostat. Replace if contacts  
remain closed.  
Thermostat contacts stuck.  
Incorrect thermostat setting.  
Set to correct setting.  
Problem  
Possible Cause  
Possible Solution  
Loss of charge in thermostat bulb.  
Replace thermostat.  
Test for continuity at terminals 1 and 2. Replace if  
defective.  
Thermostat  
does not turn on  
compressor  
Thermostat contacts open.  
Incorrect wiring or loose wires.  
System switch open.  
Connect per wiring diagram. Tighten loose wires.  
Test for continuity at switch terminals 2 and 3.  
Problem  
Possible Cause  
Possible Solution  
Thermostat set at coldest point  
Adjust.  
Disconnect power to the unit. Remove cover of  
thermostat and check if contact is stuck, if so  
replace thermostat.  
Thermostat  
does not turn off  
compressor  
Thermostat contacts stuck.  
Switch (On-Off) shorted.  
Test switch for open contacts at terminals 2 and 3  
with switch in “Off” position.  
24  
TROUBLESHOOTING  
Problem  
Possible Cause  
Possible Solution  
Compressor attempts to start  
before system pressures are  
equalized.  
Allow a minimum of 3 minutes to allow pressures  
to equalize before attempting to start.  
Check voltage with unit operating. Check for  
other appliances on the circuit. Unit should be on  
separate circuit for proper voltage, and be fused  
separately  
Low or fluctuating voltage.  
Compressor  
attempts to  
start, or runs for  
short periods  
only. Cycles on  
overload.  
Incorrect wiring  
Connect per appropriate wiring diagram  
Shorted or incorrect capacitor  
Replace capacitor  
Restricted or low air flow through  
condenser coil  
Check motor fan blade.  
Check for refrigerant restriction, blocked airflow,  
loose wires at compressor terminals and fan  
motor capacitor voltage.  
Compressor running abnormally  
hot  
Change compressor if all other corrections above  
are normal.  
Overload opens too soon.  
Problem  
Possible Cause  
Possible Solution  
Check continuity of thermostat at coldest setting. If  
compressor runs, replace thermostat.  
Thermostat contacts not closing.  
Check for nameplate voltage. Provide proper  
voltage.  
Low voltage supply.  
Switch (On-Off) inoperative.  
Defective capacitor.  
Test for continuity.  
Compressor does  
not start - fan  
motor runs.  
Test with analyzer, replace if needed.  
Compressor internal overload  
open.  
Check voltage at compressor terminals. If voltage  
is satisfactory, replace compressor.  
Solid state relay open.  
Replace relay.  
Open or shorted compressor  
windings.  
Check windings for continuity and resistance. If  
open, replace compressor.  
Problem  
Possible Cause  
Possible Solution  
Set to coldest position. Test thermostat and  
replace if necessary.  
Thermostat open or inoperative.  
Dirty air filter.  
Clean as recommended in Owner’s Manual.  
Dirty or plugged condenser or  
evaporator coil.  
Clean coils.  
Does not cool, or  
cools only slightly.  
Adjust air louvers. Check application. Check for  
dirty filter or evap coil. Check fan motor. Correct as  
needed.  
Poor air circulation in area being  
cooled.  
Low capacity - undercharge.  
Check for leak and make necessary repairs.  
Compressor not pumping properly. Replace compressor.  
NOTE: If Inside Coil Freezes Up  
Your Friedrich Hazardgard is designed not to freeze with outdoor temperatures as low as 45°F (7°C). If the indoor coil should  
ice over while cooling, set the thermostat to the warmest position until the ice on the coil is gone. Setting the thermostat to a  
slightly warmer position will probably keep ice from forming on the coil. A dirty filter will contribute to icing.  
25  
TROUBLESHOOTING  
Problem  
Possible Cause  
Possible Solution  
Defective switch (On-Off)  
Fan capacitor open.  
Check continuity across terminals 2 and 3.  
Test with capacitor analyzer. Replace if bad.  
Check power and if okay, perform continuity test.  
Replace if bad.  
Inoperative fan motor.  
Fan motor does  
not run.  
Incorrect wiring of fan circuit.  
Solid state relay open.  
Connect per wiring diagram.  
Replace relay.  
Seized motor bearings.  
Replace motor.  
Bound fan blade or blower wheel.  
Adjust for proper clearance.  
Problem  
Possible Cause  
Possible Solution  
Switch (On-Off)  
does not cut fan  
motor off.  
Defective (On-Off) switch or  
defective relay.  
Replace switch or relay.  
Problem  
Possible Cause  
Refer to installation instructions for proper  
installation.  
Poor installation.  
Fan blade striking chassis or  
blower wheel housing.  
Adjust fan blade or blower wheel clearance.  
Noisy and/or  
vibration.  
Check for deteriorated compressor grommets.  
Replace as needed.  
Compressor vibrating.  
Loose cabinet parts, improperly  
mounted components, tubing  
rubbing.  
Adjust and tighten as required.  
Possible Solution  
Problem  
Possible Cause  
Evaporator drain pan overflowing.  
Clean obstructed drain trough.  
Condensation forming on bottom of Evaporator drain pan broken or cracked. Replace  
Water leaks into  
room.  
base pan.  
chassis seal gasket missing or defective.  
Water dripping from discharge air  
grilles.  
Dirty evaporator coil, or extremely high humidity  
conditions. Clean coil or check application.  
Possible Solution  
Problem  
Possible Cause  
Extremely high humid conditions.  
Install 01900-235 drain kit.  
Water in center section of base pan Drain trough. Check level. Ensure 1/4” tilt toward  
(compressor area).  
rear.  
Excessive water  
leaks outside.  
Dirty condenser coil.  
Clean with steam or detergent.  
Fan blade and slinger ring  
improperly positioned.  
Adjust fan blade to 1/2” clearance from condenser  
coil.  
26  
eLeCTROMeCHANICAL CONTROL  
COOL ONLY MODeLS:  
SH15M30-A  
SH20M30-A  
27  
Friedrich Air Conditioning Company  
P.O. Box 1540  
San Antonio, TX 78295  
210.357.4400  
HAZARDGARD®  
ROOM AIR CONDITIONERS  
LIMITED WARRANTY  
LIMITED ONE YEAR PARTS WARRANTY  
1. Limited warranty – One year. Friedrich warrants that it will provide a replacement for any part of this HazardGard Room Air Conditioner found defective in  
material or workmanship for a period of one (1) year from the date of original purchase.  
2. Limited warranty – One year. The Friedrich warranty also covers the cost of labor for repairing any compressor, condenser, evaporator or inter-connecting  
tubing found defective within the warranty period, providing the unit is returned to an authorized Friedrich Repair Station located within the Continental United  
States.  
The Friedrich warranty does not cover:  
(1) Any charges for removal, transportation or reinstallation of the unit; (2) the cost of labor to replace parts other than those described above; and (3) does  
not apply to any HazardGard Room Air Conditioner that has been subject to (a) accident, misuse, flood, fire, or neglect; (b) repairs or alterations outside of  
the Friedrich Authorized Dealer or Service Center so as to affect adversely its performance and reliability; or (c) any repairs or servicing as a result of using  
parts not sold or approved by Friedrich.  
LIMITATIONS: This warranty is a LIMITED warranty. Anything in the warranty notwithstanding, IMPLIED WARRANTIES FOR PARTICULAR PURPOSE  
AND MERCHANTABILITY SHALL BE LIMITED TO THE DURATION OF THE EXPRESS WARRANTY. MANUFACTURER EXPRESSLY DISCLAIMS AND  
EXCLUDES ANY LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES FOR BREACH OF ANY EXPRESSED OR IMPLIED WARRANTY.  
Performance of Friedrich’s Warranty obligation is limited to one of the following methods:  
1. Repair of the unit  
2. A refund to the customer for the prorated value of the unit based upon the remaining warranty period of the unit.  
3. Providing a replacement unit of equal value  
The method of fulfillment of the warranty obligation is at the sole discretion of Friedrich Air Conditioning.  
WARNING: - EXPLOSION HAZARD -  
SUBSTITUTION OF COMPONENTS MAY IMPAIR SUITABILITY FOR CLASS 1, DIVISION 2  
28  
TECHNICAL SUPPORT  
CONTACT INFORMATION  
FRIEDRICH AIR CONDITIONING CO.  
Post Office Box 1540 · San Antonio, Texas 78295-1540  
4200 N. Pan Am Expressway · San Antonio, Texas 78218-5212  
(210) 357-4400 · 877-599-5665 x 846 · FAX (210) 357-4490  
Printed in the U.S.A.  
29  
FRIEDRICH AIR CONDITIONING CO.  
Post Office Box 1540 · San Antonio, Texas 78295-1540  
4200 N. Pan Am Expressway · San Antonio, Texas 78218-5212  
(210) 357-4400 · FAX (210) 357-4490  
HG-ServMan (4-10)  
Printed in the U.S.A.  

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