2007 Service & Parts Manual
Room Air Conditioners
60 Hz Models
SH15L30-B
SH20L30-B
HG-SVC-PRTS-07 (3-07)
3
COMPONENT OPERATION AND TESTING
WARNING
Testing Procedures
1. Terminal "C" and "S" – no continuity – open winding
– replace compressor.
DISCONNECT ELECTRICAL POWER TO THE
UNIT BEFORE SERVICING OR TESTING
2. Terminal "C" and "R" – no continuity – open winding
– replace compressor.
3. Terminal "R" and "S" – no continuity – open winding
- replace compressor.
COMPRESSORS
Compressors are single phase, 208/230 volt. All compressor
motors are permanent split capacitor type, using only a running
capacitor across the start and run terminal.
4. Terminal "C" and the shell of the compressor – continuity
– grounded motor – replace compressor.
5. Should continuity exist between terminals "R" and "S",
but not between terminals "C" and "S" and "C" and "R",
the internal overload may be open. If the compressor is
extremely hot, allow it sufficient time to cool. It may require
as long as one hour for the compressor to cool sufficiently
for the internal overload to close.
All compressors are internally spring mounted and externally
mounted on rubber isolators.
Line Voltage Overload
The compressor is equipped with an internal line voltage over-
load. This overload is embedded in the windings of the motor
to sense the motor temperature. The overload will open and
disconnect the power to the motor due to high temperatures
caused by:
GROUND TEST
Use an ohmmeter set on its highest scale. Touch one lead to
thecompressorbody(cleanpointofcontact, asagoodconnec-
tion is a must) and the other probe in turn to each compressor
terminal. (See Figure 3.) If a reading is obtained, the compressor
is grounded and must be replaced.
1. A locked rotor.
2. Excessive running amps.
3. High discharge temperature.
4. Low refrigerant charge.
FIGURE 3 TYPICAL GROUND TEST
FIGURE 1 INTERNAL OVERLOAD
LINE BREAK
INTERNAL OVERLOAD
OHMMETER
CHECKING COMPRESSOR EFFICIENCY
The reason for compressor inefficiency is normally due to bro-
ken or damaged suction and/or discharge valves, reducing the
ability of the compressor to pump refrigerant gas.
COMPRESSOR WINDING TEST (Figure 2.)
Remove the compressor terminal box cover and disconnect the
wires from the terminals. Using an ohmmeter, check continuity
across the following:
This condition can be checked as follows:
1. Install a piercing valve on the suction and discharge or liquid
process tube.
FIGURE 2 COMPRESSOR WINDING TEST
2. Attach gages to the high and low sides of the system.
3. Start the system. Run a "cooling or heating performance test."
If test shows:
A. Below normal high side pressure.
B. Above normal low side pressure.
C. Low temperature difference across the coil.
The compressor valves are faulty - replace the compressor.
4
FAN MOTOR (Figure 4)
CAPACITOR, RUN
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.
A run capacitor is wired across the auxiliary and main winding
of a single phase permanent split capacitor motor such as the
compressor and fan motors. A single capacitor can be used for
each motor or a dual rated capacitor can be used for both.
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.
The capacitor’s primary function is to reduce the line current
while greatly improving the torque characteristics of a motor.
The capacitor also reduces the line current to the motor by
improving the power factor of the load. The line side of the
capacitor is marked with a red dot and is wired to the line side
of the circuit (see Figure 7.)
FIGURE 4
FAN MOTOR
FIGURE 7 RUN CAPACITOR HOOK–UP
COMPRESSOR
FAN
MOTOR
FAN MOTOR – TEST
Disconnect power to the unit.
1. Determine that the capacitor is serviceable.
2. Disconnect the black lead from the circuit board.
RED DOT
3. Apply "live" test cord leads to the common terminal of
the capacitor and the black lead. The motor should run
at high speed.
RUN CAPACITOR
CAPACITOR – TEST
SOLID STATE RELAY (Figure 5)
Two 50 amp rated 208/230 volt solid state relays are used to
energizethecompressorandfanmotor. Terminals3and4arethe
208/230 volt line side. Terminals 1 and 2 are load side contacts.
1. Remove the capacitor from the unit.
2. Check for visual damage such as bulges, cracks, or
leaks.
FIGURE 5
SOLID STATE
RELAY
Line side
3. For dual rated capacitors, apply an ohmmeter lead to
the common (C) terminal and the other probe to the
compressor (HERM) terminal. A satisfactory capacitor will
cause a deflection on the pointer, then gradually move back
to infinity.
Load side
4. Reverse the leads of the probe and momentarily touch the
capacitor terminals. The deflection of the pointer should be
two times that of the first check if the capacitor is good.
LED indicates
contacts closed
when lit
5. Repeat steps 3 and 4 to check the fan motor capacitor.
SYSTEM CONTROL SWITCH (Figure 6)
This switch is double pole, single throw. Check for continuity
between terminals 2 and 3, and 5 and 6.
NOTE: A shorted capacitor will indicate a low
resistance and the pointer will move more to the “0”
end of the scale and remain there as long as the
probes are connected. An open capacitor will show
no movement of the pointer when placed across the
terminals of the capacitor.
FIGURE 6
SWITCH, ON-OFF
5
THERMOSTAT
FIGURE 9
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 (see Figure 8).
FIGURE 8
SENSING
BULB LOCATION
SEALED REFRIGERATION SYSTEM
REPAIRS
Equipment Required:
1. Voltmeter
RANGE: Thermostat
(Part No. 618-225-02)
60° F ( ± 2° ) to 90° F( ± 4° )
2. Ammeter
3. Ohmmeter
4. E.P.A Approved Refrigerant Recovery System
5. Vacuum Pump (capable of 200 microns or less vacuum).
6. Acetylene Welder
TEST
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.
7. Electronic Halogen Leak Detector (G.E. Type
H-6 or equivalent).
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.
8. Accurate refrigerant charge measuring device
such as:
a. Balance Scales - 1/2 oz. accuracy
b. Charging Board - 1/2 oz. accuracy
LOW AMBIENT BYPASS VALVE (Figure 9)
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.
9. High Pressure Gauge - (0-400 lbs.)
10. Low Pressure Gauge - (30" - 150 lbs.)
11. Vacuum Gauge - (0-1000 microns)
Equipment Must Be Capable of:
1. Recovering CFC’s as low as 5%.
2. Evacuation from both the high side and low side of the
system simultaneously.
3. Introducing refrigerant charge into the high side of the
system.
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.
4. Accurately weighing the refrigerant charge actually intro-
duced into the system.
5. Facilities for flowing nitrogen through the refrigeration
tubing during all brazing processes.
6
12. Restart the unit several times after allowing pressures
to stabilize. Pinch off the process tubes, cut and solder
the ends. Remove the pinch off tool, and leak check the
process tube ends.
HERMETIC COMPONENT REPLACEMENT
The following procedure applies when replacing components
in the sealed refrigeration circuit or repairing refrigerant leaks.
(Compressor, condenser, evaporator, capillary tube, refrigerant
leaks, etc.)
SPECIAL PROCEDURES IN THE CASE OF
COMPRESSOR MOTOR BURNOUT
1. Recover the refrigerant from the system at the process
tube located on the high side of the system by installing
a line tap on the process tube. Apply the gauge from the
process tube to EPA approved gauges from the process
tube to the EPA approved recovery system. Recover the
CFC’s in the system to at least 5%.
1. Recover all refrigerant and oil from the system.
2. Remove the compressor, capillary tube and filter drier from
the system.
3. Flush the evaporator, condenser and all connecting tubing
with dry nitrogen, or equivalent, to remove all contamination
from the system. Inspect the suction and discharge lines
for carbon deposits. Remove and clean if necessary.
2. Cut the process tube below the pinch off in the suction side
of the compressor.
3. Connect the line from the nitrogen tank to the suction
process tube.
4. Reassemble the system, including a new drier-strainer and
capillary tube.
4. Drift dry nitrogen through the system and unsolder the
more distant connection first. (Filter drier, high side
process tube, etc.)
5. Proceed with processing as outlined under hermetic
component replacement.
5. Replace the inoperative component, and always install a
new filter drier. Drift dry nitrogen through the system when
making these connections.
ROTARY COMPRESSOR
SPECIAL TROUBLESHOOTING & SERVICE
6. Pressurize the system to 30 PSIG with proper refrigerant
and boost the refrigerant pressure to 150 PSIG with dry
nitrogen.
Basically, troubleshooting and servicing rotary compressors
is the same as on the reciprocating compressor with only a
few exceptions.
7. Leak test the complete system with the electric halogen
leak detector, correcting any leaks found.
1. Because of the spinning motion of the rotary, the mounts
are critical. If vibration is present, check the mounts
carefully.
8. Reduce the system to zero gauge pressure.
2. The electrical terminals on the rotary are in a different order
than the reciprocating compressors. The terminal markings
are on the cover gasket. Use your wiring diagram to insure
the correct connections.
9. Connect the vacuum pump to the high side and low side
of the system with deep vacuum hoses, or copper tubing.
(Do not use regular hoses.)
10. Evacuate the system to an absolute holding pressure of
200 microns or less.
REFRIGERANT CHARGE
1. The refrigerant charge is extremely critical. Measure the
charge carefully and as exactly as possible to the nameplate
charge.
NOTE: This procedure can be sped up by the use of
heat lamps, or by breaking the vacuum with refrigerant
or dry nitrogen at 5,000 microns. Pressure system to 5
PSIG and leave in the system a minimum of 10 minutes.
Recover refrigerant, and proceed with evacuation to a
pressure of 200 microns or a minimum of 10%.
2. The correct method for charging the rotary is to introduce
liquid refrigerant into the high side of the system with the
unit off. Then start the compressor and enter the balance
of the charge, gas only, into the low side.
The introduction of liquid into the low side, without the use of
a capillary tube, will cause damage to the discharge valve
of the rotary compressor.
11. Break the vacuum by charging the system from the high
side with the correct amount of refrigerant specified. This
will prevent boiling the oil out of the crankcase.
NOTE: All inoperative compressors returned to Friedrich
must have all lines properly plugged with the plugs from
the replacement compressor.
NOTE: If the entire charge will not enter the high side,
allow the remainder to enter the low side in small
increments while operating the unit.
7
TROUBLESHOOTING
PROBLEM
POSSIBLE CAUSE
TO CORRECT
Power disconnected.
Check power source.
System switch in “Off” position. Set switch correctly.
Branch circuit fuse blown or
circuit breaker tripped.
Replace fuse, reset breaker. If repeats, check fuse or breaker
size. Check for shorts in unit wiring and components.
UNIT DOES NOT RUN.
Inoperative system switch.
Test for continuity.
Loose or disconnected wiring
at switch.
Check wiring and connections.
Connect per wiring diagram.
Inoperative switch (On-Off).
Test for continuity, 3 and 2, 5 and 6.
Dirty Filter.
Clean as recommended in Owner’s Manual.
Check for dirty or obstructed coil - clean as required.
Test for shorted thermostat or stuck contacts.
De-ice coil and check for leak.
Restricted air flow.
Inoperative thermostat.
Short of refrigerant.
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 and replace if inoperative.
Excessive heat load.
Restriction in line.
Test cooling performance of unit. Unit undersized.
Check for partially iced coil. Check temperature split across
coil.
COMPRESSOR RUNS
CONTINUALLY.
Check for presence of oil on silver soldered connections.
Check for partially iced coil. Check split across coil. Check for
low running amperage.
Refrigerant leak.
DOES NOT CYCLE OFF.
Check operation of thermostat. Replace if contacts remain
closed.
Thermostat contacts stuck.
Loss of charge in thermostat
bulb.
Place jumper across thermostat terminals. If unit operates,
replace thermostat.
Loose or broken parts in
thermostat.
THERMOSTAT DOES
NOT TURN UNIT ON.
Check as above.
Incorrect wiring.
Connect per wiring diagram.
System switch open.
Test for continuity at switch terminals 2 and 3.
Thermostat set at coldest point Turn to highest temperature setting to see of unit will cycle off.
Disconnect power to the unit. Remove cover of thermostat
Thermostat contacts stuck.
THERMOSTAT DOES
NOT TURN UNIT OFF.
and check if contact is stuck, if so replace thermostat.
Test switch for open contacts at terminals 2 and 3 with switch
Switch (On - Off) shorted.
in “Off” position.
8
TROUBLESHOOTING (Continued)
PROBLEM
POSSIBLE CAUSE
TO CORRECT
Compressor attempts to start
before system pressures are
equalized.
Allow a minimum of two (2) 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
Incorrect wiring.
Connect per wiring diagram.
Check by substituting a known good capacitor of correct
rating.
Shorted or incorrect capacitor.
PERIODS ONLY.
CYCLES ON
OVERLOAD.
Restricted or low air flow through
condenser coil.
Check for proper fan speed or blocked condenser.
Compressor running abnormally
hot.
Check for kinked discharge line or restricted condenser.
Check amperage.
Change compressor if all other corrections above are
normal.
Overload opens too soon.
Check continuity of thermostat at coldest setting. Jump
contacts, if compressor runs, replace thermostat.
Thermostat contacts not closing.
Low voltage supply.
Check for nameplate voltage.
Test for continuity.
Switch (On-Off) inoperative.
COMPRESSOR DOES
NOT START - FAN
MOTOR RUNS.
Check by substituting a known good capacitor of correct
rating.
Open capacitor.
Check voltage at compressor terminals. If voltage is
satisfactory, replace compressor.
Internal overload open.
Relay open
Replace relay
Open or shorted compressor
windings
Check windings for continuity and resistance. Direct test
compressor. If direct test fails, replace compressor.
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.
Use steam or detergents to clean.
DOES NOT COOL,
OR COOLS ONLY
SLIGHTLY.
Poor air circulation in area being
cooled.
Adjust air louvers.
Low capacity - undercharge.
Clean, check for leak and make repair.
Check amperage draw against nameplate. If not conclusive,
make pressure test.
Compressor not pumping properly.
9
TROUBLESHOOTING (Continued)
PROBLEM
POSSIBLE CAUSE
TO CORRECT
Defective switch (On-Off).
Check continuity across terminals 2 and 3.
Check by substituting a known good capacitor of the same
rating.
Fan capacitor open.
Inoperative fan motor.
Direct test fan motor.
FAN MOTOR DOES
NOT RUN.
Incorrect wiring of fan circuit.
Relay open.
Connect per wiring diagram.
Replace Relay.
Check for seized motor bearings.
Bound fan blade or blower wheel.
Rotate by hand, add oil, if noisy, replace.
Adjust for proper clearance.
SWITCH (ON-OFF)
DOES NOT CUT
FAN MOTOR OFF.
Selector Switch Relay
Replace selector switch. Replace relay.
Poor installation.
Refer to Installation Instructions for proper installation.
Adjust motor mount to attain proper fan blade and blower
wheel clearance.
Fan blade striking chassis.
NOISY AND/OR
VIBRATION.
Check for deteriorated compressor grommets, or missing
mounting parts.
Compressor vibrating.
Loose cabinet parts, improperly
mounted components, tubing
rubbing.
Adjust and tighten as required.
Evaporator drain pan overflowing. Clean obstructed drain trough.
Condensation forming on bottom
of base pan.
Evaporator drain pan broken or cracked. Reseal or
replace.
WATER LEAKS
INTO ROOM.
Water dripping from discharge air Dirty evaporator coil, or extremely high humidity conditions.
grilles.
Clean coil with steam or detergent.
Evaporator drain pan cracked or
obstructed.
Repair and clean, or replace as required.
Remove condenser shroud, Clean and remove old sealer
from base pan and shroud. Apply new sealer, reinstall and
check.
Water in center section of base
pan (compressor area).
OUTSIDE WATER
LEAKS.
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.
10
WIRING DIAGRAM
MODELS SH15L30-B and SH20L30-B
11
HAZARDGARD CABINET PARTS
12
HAZARDGARD CHASSIS PARTS
13
HAZARDGARD PARTS LIST
REF
DESCRIPTION
PART NO#
MODELS
CODE
ELECTRICAL PARTS
1
1
2
2
5
*
COMPRESSOR
COMPRESSOR
MOTOR, FAN
MOTOR, FAN
61193549
61193550
61871426
61871427
60935300
61829700
61108800
61822502
61080546
61080547
61821308
1
1
600
600
110
110
130
399
399
120
150
150
399
1
1
1
1
2
1
SWITCH, ON-OFF DPST
INSULATOR, ELECTRICAL
RELAY, SOLID STATE
THERMOSTAT
1
1
2
1
1
*
6
7
7
*
CAPACITOR 20/7.5 440 V.
CAPACITOR 25/7.5 440 V
HARNESS, WIRE, COMP.
1
1
1
REFRIGERATION PARTS
9
9
EVAPORATOR COIL
EVAPORATOR COIL
CONDENSER COIL
CONDENSER COIL
DRIER, LIQUID
61850100
61850001
62050410
62050411
60308101
01390005
03760518
60809500
1
1
400
400
410
410
480
471
471
520
1
10
10
*
1
1
1
1
*
CAPILLARY TUBE
CAPILLARY TUBE
VALVE, BY-PASS
*
2
*
2
14
HAZARDGARD PARTS LIST
REF
DESCRIPTION
PART NO#
MODELS
CODE
CHASSIS PARTS
8
11
17
22
22
23
23
25
25
26
26
27
29
29
30
30
32
34
35
36
36
37
37
38
38
40
41
*
HOLDER, THERMOSTAT
61829800
61493915
61822662
60542003
60542004
60610616
60610617
61802500
61804100
61803601
61804901
61802600
61817300
61817400
61814905
61817505
61803444
91400400
61831006
61825708
61825709
61808906
61811111
60294415
60294420
61819711
61819811
61989000
60865808
60865809
61823000
61803800
01193549
61818500
61818501
60846016
61717301
1
1
1
1
1
1
1
999
761
760
710
710
700
700
900
900
720
720
722
742
742
743
743
730
791
753
770
770
772
772
999
999
999
999
752
754
754
756
840
790
771
771
999
780
KNOB, CONTROL
DECORATIVE PANEL
FAN BLADE, COND.
FAN BLADE, COND.
BLOWER WHEEL, EVAP.
BLOWER WHEEL, EVAP.
FAN MOTOR MOUNT
FAN MOTOR MOUNT
SHROUD, CONDENSER
SHROUD, CONDENSER
BRACE, COND.SHROUD
BLOWER FRONT
BLOWER FRONT
SCROLL
1
1
1
1
1
1
1
3
3
1
1
1
SCROLL
1
1
3
1
BASE PAN
1
3
1
1
BOLT, COMP. MOUNT
PLENUM ASSEMBLY
OUTER SHELL
OUTER SHELL
1
1
GRILLE, INTAKE
1
1
GRILLE, INTAKE
WINGBOARD
WINGBOARD
1
1
2
2
ANGLE, WINGBOARD TOP
ANGLE,WINGBORD SIDE
LATCH, INTAKE GRILLE
FILTER, AIR
1
2
2
1
*
*
FILTER, AIR
1
2
1
3
*
HOLDER, FILTER
DRAIN PAN, EVAP.
GROMMET, COMP. MOUNT
REAR GRILLE
2
1
3
1
*
*
*
*
REAR GRILLE
1
1
1
*
BAG, ASSY. HARDWARE
GASKET, CHASSIS
1
1
*
OPTIONAL ACCESSORY ITEMS
*
*
DRAIN KIT, DC-2
01900235
01900312
1
1
1
1
START KIT, CAP.\RELAY
15
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.
(10-04)
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) 357-4480
Printed in the U.S.A.
HG-SVC-PRTS-07 (3-07)
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