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TROUBleSHOOTING

Problem

Possible Cause

Action

Unit does not run

Power disconnected.

Check power source.

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.

Loose or disconnected wiring at

switch.

Check wiring & connections. Connect per wiring

diagram.

Inoperative switch (On-Off).

Test for continuity, 3 and 2, 5 and 6. If bad,

replace.

Problem

Possible Cause

Action

Evaporator coil

freezes up

Dirty filter.

Clean as recommended in Owner's Manual.

Restricted airflow.

Check for dirty or obstructed coil clean as

required.

Inoperative thermostat.

Test for shorted thermostat or stuck contacts.

Short of refrigerant.

De-ice coil and check for leak.

Partially restricted capillary.

De-ice coil. Check temperature differential

across coil. Touch-test coil return bends for same

temperature. Test for low running current.

Inoperative fan motor.

Test fan motor & replace if inoperative.

Problem

Possible Cause

Action

Compressor runs

continually. Does

not cycle off.

Excessive heat load.

Test cooling performance of unit. Unit undersized.

Restriction in line.

Check for partially iced coil. Check temperature

split across coil.

Refrigerant leak.

Check for presence of oil on silver soldered

connections. Check for partially iced coil. Check

split across coil. Check for low running amperage.

Thermostat contacts stuck.

Check operation of thermostat. Replace if contacts

remain closed.

Incorrect thermostat setting.

Set to correct setting.

Problem

Possible Cause

Action

Thermostat

does not turn on

compressor

Loss of charge in thermostat bulb.

Replace thermostat.

Thermostat contacts open.

Test for continuity at terminals 1 and 2. Replace if

defective.

Incorrect wiring or loose wires.

Connect per wiring diagram. Tighten loose wires.

System switch open.

Test for continuity at switch terminals 2 and 3.

Problem

Possible Cause

Action

Thermostat

does not turn off

compressor

Thermostat set at coldest point

Adjust.

Thermostat contacts stuck.

Disconnect power to the unit. Remove cover of

thermostat and check if contact is stuck, if so

replace thermostat.

Switch (On-Off) shorted.

Test switch for open contacts at terminals 2 and 3

with switch in “Off” position.

Содержание Hazardgard SH15L30-C

Страница 1: ...Service Manual Room Air Conditioners HG ServMan 04 09 Model SH15L30 C SH15L30 D SH20L30 C SH20L30 D...

Страница 2: ...IONING CO Post Office Box 1540 San Antonio Texas 78295 1540 4200 N Pan Am Expressway San Antonio Texas 78218 5212 210 357 4400 FAX 210 357 4490 www friedrich com Printed in the U S A TECHNICAL SUPPORT...

Страница 3: ...n Data 6 Electrical Data 7 HazardGard Special Features 8 Control Panel 8 Component Definitions 9 Component Testing 10 11 Sealed System Refrigeration Repairs 12 Refrigerant Charging 12 15 Compressor Ch...

Страница 4: ...sistant 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 tes...

Страница 5: ...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 b...

Страница 6: ...rty 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 th...

Страница 7: ...g L Nov C Mar F Jun J Sept M Dec 1st Digit Function S Straight Cool Value Series H HazardGard 3rd and 4th Digit Approximate BTU HR Cooling Heating BTU Hr capacity listed in the Specifi cation Performa...

Страница 8: ...t Locked Rotor Amps Charge in OZ 60 Hertz Amps SH15L30 C 54 26 206 129 61 16 98 76 258 8 2 43 28 5 208 230 15 SH15L30 D 54 26 206 129 61 16 98 76 258 8 2 43 28 5 208 230 15 SH20L30 C 46 34 125 196 52...

Страница 9: ...PA 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 ac...

Страница 10: ...it Condensate drain with exclusive mosquito trap 15 amp circuit with time delay fuse required Accommodates direct wiring Long lasting 3 8 10mm thick air filter germicidally treated easily removed for...

Страница 11: ...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...

Страница 12: ...n 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 automati...

Страница 13: ...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...

Страница 14: ...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...

Страница 15: ...EZE 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...

Страница 16: ...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 pres...

Страница 17: ...a partial restriction there may be gurgling sounds 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 th...

Страница 18: ...Test NOTE Consult the specification and performance section for running amperage The L R A can also be found on the rating plate Select the proper amperage scale and clamp the meter probe around the w...

Страница 19: ...inals common to run C to R 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 In a single phase...

Страница 20: ...tem will need to be cleaned up following proper procedures 7 Install the replacement compressor 8 Pressurize with a combination of R 22 and nitrogen and leak test all connections with an electronic or...

Страница 21: ...se a biodegradable cleaning agent and degreaser to prevent damage to the coil and or base pan NOTICE NOTICE Inspect the indoor blower housing evaporator blade condenser fan blade and condenser shroud...

Страница 22: ...yearly or bi yearly and clean of all obstructions and debris Clean both areas with an antibacterial and antifungal cleaner Rinse both items thoroughly with water and ensure that the drain outlets are...

Страница 23: ...or runs continually Does not cycle off Excessive heat load Test cooling performance of unit Unit undersized Restriction in line Check for partially iced coil Check temperature split across coil Refrig...

Страница 24: ...motor runs Thermostat contacts not closing Check continuity of thermostat at coldest setting If compressor runs replace thermostat Low voltage supply Check for nameplate voltage Provide proper voltage...

Страница 25: ...or blower wheel clearance Compressor vibrating Check for deteriorated compressor grommets Replace as needed Loose cabinet parts improperly mounted components tubing rubbing Adjust and tighten as requ...

Страница 26: ...24 ELECTROMECHANICAL CONTROL COOL ONLY MODELS SH15L30 C SH15L30 D SH20L30 C SH20L30 D...

Страница 27: ...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 i...

Страница 28: ......

Страница 29: ......

Страница 30: ......

Страница 31: ...IONING CO Post Office Box 1540 San Antonio Texas 78295 1540 4200 N Pan Am Expressway San Antonio Texas 78218 5212 210 357 4400 FAX 210 357 4490 www friedrich com Printed in the U S A TECHNICAL SUPPORT...

Страница 32: ...AIR CONDITIONING CO Post Office Box 1540 San Antonio Texas 78295 1540 4200 N Pan Am Expressway San Antonio Texas 78218 5212 210 357 4400 FAX 210 357 4490 www friedrich com Printed in the U S A HG Serv...

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