Friedrich HazardGard SH14J30B-A Guide

HG2003(1-03)
2004
Service & Parts Manual
HazardGard®
Room Air Conditioner
MODELS
SH14J30B-A
SH20J30B-A

2
TABLE OF CONTENTS
Specifications ................................................................................................................................... 3
Performance Data............................................................................................................................ 3
Component Operation & Testing ...................................................................................................... 4
Compressors ................................................................................................................................... 4
Thermal Overload ............................................................................................................................ 4
Checking Compressor Efficiency..................................................................................................... 5
FanMotor ......................................................................................................................................... 5
Solid State Relay .............................................................................................................................. 5
System Control Switch..................................................................................................................... 6
Run Capacitor .................................................................................................................................. 6
Thermostat....................................................................................................................................... 6
LowAmbient Bypass Valve .............................................................................................................. 8
Sealed Refrigeration System Repairs .............................................................................................. 8
Hermetic Component Replacement................................................................................................. 9
Special Procedure in the case of Compressor Motor Burn-Out....................................................... 9
Rotary Compressor Special Troubleshooting & Service ................................................................ 10
Refrigerant Charge......................................................................................................................... 10
Troubleshooting ......................................................................................................................... 11-13
Wiring Diagram .............................................................................................................................. 14
Cabinet Parts Diagram.................................................................................................................. 15
Chassis Parts Diagram................................................................................................................. 16
Parts List ................................................................................................................................... 17-19
PAGE

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* Rating Conditions: 80° F. Room Air Temperature and 59% Relative Humidity with 95° F. Outside Air Temperature at 40% Relative Humidity.
PERFORMANCE EVAPORATOR AIR OPERATING ELECTRICAL R-22 COMP.
DATA * TEMP° F PRESSURES RATINGS REFRIG. OIL
DISCHARGE TEMP SUCTION DISCHARGE AMPS LOCKED CHARGE IN CHARGE IN
AIR DROP °F ROTOR AMPS OUNCES FLUID OZ.
56.78 23.22 79 296 7.8 43 28 32
8.5
52.83 27.16 79.5 282 9.8 52 39 32
10.4
SH14J30B-A
SH14J30B-A
SH20J30B-A
SH20J30B-A
BTUH 14000/14000 19000/18800
E.E.R. - Btu/watt 8.0/8.0 8.5/8.5
Volts 230/208 230/208
Hertz/Phase 60/1 60/1
Amperes 7.8/8.5 9.9/10.8
Total Watts 1750/1750 2235/2210
Fuse/Breaker Size 15 20
Fan RPM 1095 1095
Evaporator Air CFM 375 425
Dehumidification-Pts./hr. 4.0 5.7
Width 25-15/16” 25-15/16”
Height 15-15/16” 17-15/16”
Depth 27-3/8” 27-3/8”
Min. Ext. into Room 5-7/8” 5-7/8”
Min. Ext to Outside 16-15/16” 16-15/16”
Net Weight 129 Lbs. 177 Lbs.
Shipping Weight 147 Lbs. 199 Lbs.
Maximum Temperature Rating 1200C (2480F) Ignition Temperature Rating
for Class 1, Division 2, Group D
SPECIFICATIONS SH14J30B-A SH20J30B-A

4
COMPRESSOR WINDING TEST (Figure 2.)
Remove the compressor terminal box cover and
disconnectthe wiresfromthe terminals. Usingan
ohmmeter, checkcontinuityacrossthefollowing:
DISCONNECT ELECTRICAL POWER TO
THE UNIT BEFORE SERVICING OR
TESTING
COMPONENT OPERATION AND TESTING
WARNING
COMPRESSORS
Compressors are single phase, 208/230 volt. All
compressormotors arepermanentsplit capacitor
type,usingonlyarunningcapacitoracrossthestart
andrunterminal.
Allcompressorsareinternallyspringmountedand
externallymountedonrubberisolators.
Line Voltage Overload
The compressor is equipped with an internal line
voltage overload. 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
temperaturescaused by:
1. Alocked rotor.
2. Excessiverunningamps.
3. Highdischargetemperature.
4. Lowrefrigerantcharge.
FIGURE1 INTERNAL OVERLOAD
LINEBREAK
INTERNALOVERLOAD
OHMMETER
FIGURE 2 COMPRESSOR WINDING TEST
Testing Procedures
1. Terminal "C" and "S" - no continuity -
open winding - replace compressor.
2. Terminal "C" and "R" - no continuity -
open winding - replace compressor.
3. Terminal "R" and "S" - no continuity
open winding - replace compressor.
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.

5
FAN MOTOR (Figure 4)
A230volt singlephase permanentsplitcapacitor
motor is used to drive the evaporator blower and
condenserfan. Arunningcapacitoriswiredacross
thestart andrunterminalsofthe motor.
Themotor istotallyenclosedandisprotectedwith
a line voltage overload located internally of the
motor. The motor shaft is stainless steel to resist
corrosion.
CHECKING COMPRESSOR EFFICIENCY
Thereason forcompressorinefficiencyis
normallydue tobroken ordamaged suctionand/
ordischarge valves,reducing theability ofthe
compressorto pumprefrigerantgas.
This condition can be checked as
follows:
1. Installapiercing valveon thesuctionand
dischargeorliquid processtube.
2. Attach gages to the high and low sides of the
system.
3. Start the system and run a "cooling or
heatingperformance test."
If test shows:
A. Belownormalhigh sidepressure.
B. Abovenormallow sidepressure.
C. Low temperaturedifference across thecoil.
The compressor valves are faulty -
replace the compressor.
GROUND TEST
Use an ohmmeter set on its highest scale. Touch
one lead to the compressor body (clean point of
contact, as a good connection is a must) and the
other probe in turn to each compressor terminal.
(See Figure 3.) If a reading is obtained, the
compressorisgrounded andmust be replaced.
FIGURE3 TYPICALGROUND TEST
FAN MOTOR – TEST
Disconnectpower tothe unit.
1. Determinethatthe capacitoris serviceable.
2. Disconnect the black lead from the circuit
board.
3. Apply "live" test cord leads to the common
terminalof thecapacitor andthe blacklead.
Themotor shouldrunathighspeed.
SOLID STATE RELAY (Figure 5)
Two 50 amp rated 208/230 volt solid state relays
areusedtoenergizethecompressorandfanmotor.
Terminals 3 and 4 are the 208/230 volt line side.
Terminals 1 and 2 are load side contacts.
FIGURE 4 FAN MOTOR
FIGURE 5 SOLID STATE RELAY
LED indicates
contacts closed
when lit
Line side
Load side

6
RED DOT
RUN CAPACITOR
FAN
MOTOR
COMPRESSOR
FIGURE 7 RUN CAPACITOR HOOK–UP
CAPACITOR, RUN
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 capacitor’s primary function is to reduce the
line current while greatly improving the torque
characteristics of a motor. The capacitor also
reducesthe linecurrent tothemotorbyimproving
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.)
THERMOSTAT
Acrossambient
thermostatis used
tomaintain the
desiredcomfort level.
Thethermostatreacts only
toa changein temperature
atthe bulblocation.
Importanttothe
successfuloperation
ofthe unitisthe position
ofthe sensingbulb in
relationto theevaporator
(see Figure 8). FIGURE8
SENSINGBULB
LOCATION
CAPACITOR – TEST
1. Removethecapacitor fromtheunit.
2. Check for visual damage such as bulges,
cracks,orleaks.
3. Fordualrated capacitors,apply anohmmeter
leadto thecommon(C)terminaland theother
probe to the compressor (HERM) terminal. A
satisfactory capacitor will cause a deflection
on the pointer, then gradually move back to
infinity.
4. Reverse the leads of the probe and
momentarilytouchthecapacitorterminals. The
deflection of the pointer should be two times
that of the first check if the capacitor is good.
5. Repeat steps 3 and 4 to check the fan motor
capacitor.
NOTE: A shorted capacitor will indicate a low
resistanceandthepointerwillmovemoretothe
“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.
SYSTEM CONTROL SWITCH (Figure 6)
Thisswitch isdoublepole, singlethrow. Check for
continuitybetweenterminals2and 3,and5and6.
FIGURE 6 SWITCH, ON-OFF
RANGE:
Thermostat
(Part No. 618-225-02)
60°F ( ± 2°) to 90°F( ± 4°)

7
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.
TEST
Remove the wires from the thermostat. Turn the
thermostattoits coldestposition. Check toseeif
thereiscontinuitybetweenthetwoterminals. Turn
the thermostat to its warmest position. Check
continuityto seeif thethermostatcontactsopen.

8
LOW AMBIENT BYPASS VALVE (Figure 9)
TheHazardGardunitisdesignedtooperateatlow
outside ambient temperatures. This is
accomplishedbytheuseofabypassvalveinstalled
inthe refrigerationcircuit. Thevalveisconnected
betweenthe dischargelineatthecompressor and
the suction process tube. The valve responds to
suction pressure which, when reduced in the
system,causesthe valveto openandbypass hot
gasfromthehighpressuresidetothelowpressure
side of the system. The hot gas entering the
compressor mixes with the cool gas returned
throughthesuctionline,thusincreasingthesuction
pressure. The valve is preset to open when the
suction pressure reaches 50 psig. This pressure
setting cannot be altered. The system can be
operatedat outdoortemperaturesas lowas 45°F
beforetheevaporatorcoilwill begintoaccumulate
frost.
Todetermineifthevalveoperates, blockthereturn
airtotheevaporatorcoil. Turnontheunitandtouch
thetubeatthebypass valveoutletwhich connects
to the suction process tube. When the low side
pressurereachesapproximately 50psig,thevalve
will begin to open and the tube will get hot. This
methodwill determineif thevalve isrespondingto
thesuction pressurechange.
FIGURE9
LOWAMBIENT Bypass
VALVE
EQUIPMENT REQUIRED:
1. Voltmeter
2. Ammeter
3. Ohmmeter
4. E.P.AApprovedRefrigerant RecoverySystem
5. VacuumPump(capableof200micronsorless
vacuum).
6. AcetyleneWelder
7. Electronic Halogen Leak Detector G.E. Type
H-6orequivalent).
8. Accuraterefrigerantchargemeasuringdevice
suchas:
a. Balance Scales- 1/2oz. accuracy
b. Charging Board- 1/2oz. accuracy
9. High PressureGauge -(0-400 lbs.)
10. Low Pressure Gauge - (30" - 150 lbs.)
11. Vacuum Gauge- (0-1000microns)
EQUIPMENT MUST BE CAPABLE OF:
1. Recovering CFC’s as low as 5%.
2. Evacuationfromboththehighsideandlowside
ofthesystem simultaneously.
3. Introducingrefrigerantchargeintothehighside
ofthesystem.
4. Accurately weighing the refrigerant charge
actuallyintroducedintothesystem.
5. Facilities for flowing nitrogen through the
refrigeration tubing during all brazing
processes.
SEALED REFRIGERATION SYSTEM REPAIRS

9
NOTE: This procedure can be speeded up by
the use of heat lamps, or by breaking the
vacuumwithrefrigerantordrynitrogenat 5,000
microns. Pressuresystemto5 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%.
11. Breakthevacuumbychargingthesystemfrom
the high side with the correct amount of
refrigerant specified. This will prevent boiling
theoil outof thecrankcase.
NOTE:Iftheentire chargewillnotenterthe high
side,allowtheremaindertoenter the low side in
small increments while operating the unit.
12.Restart the unit several times after allowing
pressures to stabilize. Pinch off the process
tubes, cut and solder the ends. Remove the
pinchoff tool,and leakcheck theprocess tube
ends.
SPECIAL PROCEDURES IN THE CASE OF
COMPRESSOR MOTOR BURNOUT
1. Recoverallrefrigerantandoilfromthesystem.
2. Remove the compressor, capillary tube and
filterdrier fromthe system.
3. Flush the evaporator, condenser and all
connecting tubing with dry nitrogen, or
equivalent,toremoveallcontaminationfromthe
system. Inspectthesuctionanddischargelines
for carbon deposits. Remove and clean if
necessary.
4. Reassemblethesystem,including anewdrier-
strainerand capillarytube.
5. Proceed with processing as outlined under
hermeticcomponent replacement.
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.)
1. Recovertherefrigerant fromthesystematthe
process tube located on the high side of the
system by installing a line tap on the process
tube. Applythegauge fromtheprocesstube to
EPA approved gauges from the process tube
totheEPAapprovedrecoverysystem. Recover
theCFC’sin the systemtoat least 5%.
2. Cuttheprocess tubebelow thepinchoffinthe
suctionside ofthecompressor.
3. Connect the line from the nitrogen tank to the
suctionprocess tube.
4. Drift dry nitrogen through the system and
unsolderthemoredistantconnectionfirst.(Filter
drier, high sideprocess tube,etc.)
5. Replacetheinoperativecomponent,andalways
installanewfilterdrier. Driftdrynitrogenthrough
thesystemwhenmakingthese connections.
6. Pressurize thesystemto 30 PSIGwith proper
refrigerant and boost the refrigerant pressure
to150 PSIGwith drynitrogen.
7. Leaktestthecompletesystemwith theelectric
halogen leak detector, correcting any leaks
found.
8. Reducethesystem tozero gaugepressure.
9. Connectthevacuumpumptothehighsideand
lowsideofthesystemwithdeepvacuumhoses,
orcopper tubing.(Donotuseregular hoses.)
10.Evacuate the system to an absolute holding
pressureof200 microns orless.

10
NOTE:
All inoperative compressors returned to
Friedrich must have all lines properly plugged
with the plugs from the replacement
compressor.
REFRIGERANT CHARGE
1. The refrigerant charge is extremely critical.
Measurethechargecarefully andasexactlyas
possibleto thenameplatecharge.
2. Thecorrectmethodfor chargingtherotaryisto
introduceliquid refrigerantinto thehighsideof
the system with the unit off. Then start the
compressor and enter the balance of the
charge,gas only, intothe lowside.
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.
ROTARY COMPRESSOR SPECIAL
TROUBLESHOOTING AND SERVICE
Basically, troubleshooting and servicing rotary
compressors is the same as on the reciprocating
compressorwith onlya fewexceptions.
1. Because of the spinning motion of the rotary,
the mounts are critical. If vibration is present,
checkthemountscarefully.
2. The electrical terminals on the rotary are in a
different order than the reciprocating
compressors. Theterminalmarkingsareonthe
covergasket. Useyourwiringdiagramtoinsure
thecorrect connections.