Friedrich HazardGard SH14J30B-A Guide

HG2003(1-03)

2004

Service & Parts Manual

HazardGard®

Room Air Conditioner

MODELS

SH14J30B-A

SH20J30B-A

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

* 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

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

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.

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

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°)

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.

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

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.

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.

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