2 0 11
Hazardous Duty
Room Air Conditioner
R-410A Models
Cool Only
SH15M30
SH20M30
*
*
HG-ServMan (1-11)
Last character may vary.
*
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 circuit only.
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 circuit only.
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.)
Bypass Valve
Condenser
Capillary Tubes
Air Discharge
Compressor
Condenser/Fan Blade
Shroud
Fan Blade
Electrical
Compartment
Condenser Coil
Condenser
Shroud Brace
On/Off Switch
Thermostat
Fan/Blower
Motor
Condenser
Air Intake
Air Intake
Indoor Blower
Wheel
Sleeve
Air Discharge
Front Cover
Air Discharge
Vents
4
UNIT IDENTIFICATION
Model Number Code
S H 15 M 3 0 A - A
9th Digit – Engineering Suffix
Indicates Modification
(Subject to change)
1st Digit – Function
S = Straight Cool, Value Series
8th Digit – Marketing Suffix
Indicates Modification
(Subject to change)
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 - Model Series/Year Introduced
M=2010
RAC Serial Number Identification Guide
Serial Number
Decade Manufactured
A
A
A
R
00001
Production Run Number
L=0
A=1
B=2
C=3
D=4
E=5
F=6
G=7
H=8
J=9
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 specically designed to cool living quarters, storage areas
and other enclosures situated in hazardous locations, where specic 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
O!shore oil rigs, on-shore oil company
ofces and reneries
Ofce 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 renishing/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
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
SH15M30
SH15M30
*
*
43
42.7
Due to continuing research in new energy-saving technology, performance data and 8th and 9th character are subject to change without notice.
*
Specications
Energy
Efficiency
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
Amps AHAM
6.9/7.4
Watts
EER
SH15M30
230/208
230/208
1495/1443
2074/2021
9.7/9.7
9.4/9.4
8-way
8-way
*
*
SH20M30
19500/19000
9.1/10.0
4.0
Installation Information
Circuit Rating
Dimensions
(Inches)
Breaker or
Window Width
Thru-The-Wall
Finished Hole (Inches)
Weight
(Lbs.)
(Inches)
T - D Fuse
Depth
Overall
A )
Depth J Box
Minimum Minimum
Extension Extension
to Louvers
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
/
/
/
/
/
/
/
/
SH15M30
15 16
25 16
27
27
8
6
6
3
3
16
16 16
27
27
8
42
42
16 16
26 16
3
26 16
6
6
156
160
168
174
*
*
15
15
3
1
/
15
7
3
/
/
/
/
/
/
/
SH20M30
17 16
25 16
8
16
16 16
8
18 16
Due to continuing engineering research and technology, specL¿cations 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.
Junction
Box
treatment protects the outdoor coil
against deterioration and extends
the life of the unit especially in harsh
coastal environments.
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
sealed overload.
•
•
Extra insulation inside, including completely insulated
plenum chamber for quieter, more efficient cooling.
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.
(Fan motor runs continuously)
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. (When unit
is turned on, the fan motor runs continuously).
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 88 psig.
Capillary tube
A cylindrical metering device used to evenly distribute the flow of refrigerant to the heat exchanger (evaporator
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 voltage overload located internally of the motor. The
motor shaft is stainless steel to resist corrosion. When
the unit is turned on, the motor runs continuously.
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. A 20,000
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 88 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 88 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
during all brazing processes.
4. E.P.A. Approved Refrigerant Recovery System
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 refrigeration system is
sealed, service process tubes will have to be installed. First
install a line tap and remove refrigerant from the 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
the ohmmeter on the lowest scale (R x 1).
Recommendedprocedureforcompressor
replacement
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.
For performance tests use form on page 23.
21
ROUTINE MAINTENANCE (Continued)
Discharge Air Plenum
Slot
Tab
NOTICE
Return Air Grille
Slot
Tab
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.
Latches
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. Rinsebothitems 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.
Bypass Valve
Condenser
Capillary Tubes
Air Discharge
Compressor
Condenser/Fan Blade
Shroud
Fan Blade
Electrical
Compartment
Condenser Coil
Condenser
Shroud Brace
On/Off Switch
Thermostat
Fan/Blower
Motor
Condenser
Air Intake
Air Intake
Indoor Blower
Wheel
Sleeve
Air Discharge
Front Cover
Air Discharge
Vents
22
ROOM AIR CONDITIONER UNIT
PERFORMANCE TEST DATA SHEET
DATE: _______________ MODEL:_______________ SERIAL:________________
YES
____
____
____
NO
IS THERE A FRIEDRICH SLEEVE INSTALLED?
IS THERE A CHASSIS SEAL GASKET 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)
DIFFERENTIAL
---------- F --------- F
---------- F --------- F
---------- F --------- F
OUTDOOR TEMPERATURE:
OUTDOOR AMBIENT TEMPERATURE
RELATIVE HUMIDITY (RH)
--------- F
--------- %
CONDENSER:
DISCHARGE AIR TEMPERATURE (OUTDOOR)
INTAKE AIR TEMPERATURE (OUTDOOR
DIFFERENTIAL
--------- F ---------- F
--------- F ---------- F
--------- F ---------- F
APPLICATION USE ------------------------- ROOM (RESIDENTIAL OR COMMERCIAL)
COOLING OR HEATING AREA W ---------- X L ----------- X H ----------- = SQ/CU/FT ------------
Sizing Guide
The following guide is based on normal room insulation average number of sun-exposed windows and two-person occupancy.
This is a general guide.
Please consult manual J or M for exact load calculations.
1. If heavily shaded, reduce capacity 10%.
2. If very sunny, add 10%.
3. Add 500 BTU/H per person over 2 people.
4. Add 4,000 BTU/H if area is a kitchen.
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
*
SH20M30
*
Last character may vary.
*
27
Friedrich Air Conditioning Company
10001 Reunion Place, Suite 500
San Antonio, TX 78216
1-800-541-6645
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 -
USE FRIEDRICH PARTS ONLY
SUBSTITUTION OF COMPONENTS MAY IMPAIR SUITABILITY FOR CLASS 1, DIVISION 2
(11 - 09)
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TECHNICAL SUPPORT
CONTACT INFORMATION
FRIEDRICH AIR CONDITIONING CO.
10001 Reunion Place, Ste. 500, San Antonio, TX 78216
(210) 546-0500 877-599-5665 x 261
Email: [email protected]
FAX (210) 546-0731
Printed in the U.S.A.
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FRIEDRICH AIR CONDITIONING CO.
10001 Reunion Place, Ste. 500, San Antonio, TX 78216
P 210-546-0500 | F 210-546-0731
Printed in the U.S.A.
HG-ServMan (1-11)
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