Friedrich racservmn service manual Troubleshooting Cooling, Problem To Correct

Page 36

Troubleshooting: Cooling

PROBLEM

POSSIBLE CAUSE

TO CORRECT

 

 

 

 

Low voltage.

Check for voltage at compressor. 115 volt and 230

 

Thermostat not set cold enough or

volt units will operate at 10% voltage variance

 

Set thermostat to coldest position. Test thermostat

Compressor does not

inoperative.

and replace if inoperative.

run.

Compressor hums but cuts off on

Hard start compressor. Direct test compressor. If

 

overload.

compressor starts, add starting components.

 

Open or shorted compressor

Check for continuity and resistance.

 

windings.

 

 

Open overload.

Test overload protector and replace if inoperative.

 

Open capacitor.

Test capacitor and replace if inoperative.

 

Inoperative system switch.

Test for continuity in all positions. Replace if

 

Broken, loose or incorrect wiring.

inoperative.

 

Refer to appropriate wiring diagram to check wiring.

 

 

 

 

PROBLEM

POSSIBLE CAUSE

TO CORRECT

 

 

 

 

 

 

Inoperative system switch.

Test switch and replace in inoperative.

 

 

Broken, loose or incorrect wiring.

Refer to applicable wiring diagram.

 

Fan motor

Open Capacitor.

Test capacitor and replace if inoperative.

 

does not run.

Fan speed switch open.

Test switch and replace if inoperative.

 

 

Inoperative fan motor.

Test fan motor and replace if inoperative. (Be

 

 

 

sure internal overload has had time to reset.)

 

 

 

 

 

 

 

 

 

PROBLEM

POSSIBLE CAUSE

TO CORRECT

Does not cool, or cools

only slightly.

Undersized unit.

Thermostat open or inoperative.

Dirty filter.

Dirty or plugged condenser or evaporator coil.

Poor air circulation in area being cooled.

Fresh air or exhaust air door open on applicable models.

Low capacity – undercharge. Compressor not pumping properly.

Refer to Sizing Charts.

Set to coldest position. Test thermostat and replace if necessary.

Clean as recommended in Owner’s Manual. Use steam or detergents to clean.

Adjust discharge air louvers. Use high fan speed.

Close doors. Instruct customer on use of this feature.

Check for leak and make repair.

Check amperage draw against nameplate. If not conclusive, make pressure test.

PROBLEM

 

TO CORRECT

 

 

 

 

 

 

Fuse blown or circuit tripped.

Replace fuse, reset breaker. If repeats, check fuse

 

 

or breaker size. Check for shorts in unit wiring and

 

 

 

Unit does not run.

 

components.

 

 

Power cord not plugged in.

Plug in power cord

 

 

System switch in "Off" position.

Set switch correctly.

 

 

Inoperative system switch.

Test for continuity in each switch position.

 

 

Loose or disconnected wiring at switch or

Check wiring and connections. Reconnect per wiring

 

 

other components.

diagram.

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Contents 2003 Table of Contents 1st Digit Function RAC Serial Number Identification Guide00001 Page Data Evaporator AIR Operating Electrical Breaker Pressures Ratings Refrig Fuse Performance Evaporator AIR Operating Electrical Breaker Data SS10J10AR-A TEMP. DEG. F Pressures Ratings Heating SC06H10EWY09A33F-A WY12A33F-A Heating BtuhAmps Refrigeration System Sequence of Operation Wire Size Fuse/CircuitBreaker GroundingThermal Overload External Winding TestChecking Compressor Efficiency Terminal Overload Test Terminal Overload InternalChecking the Internal Overload FAN MotorResistor System Control Panel KQ Models Only- See Figure System Control PanelEQ Model Only See Figure System Control Panel YQ Model Only System Control Switch WE & WY Models See Figure System Control Switch TestSystem Control Switch KS, SS, KM, SM, SL Models See Figure System Control Panel See FigureSystem Control Switch Heat Pump & Electric Heat Models See FigureTo SET Mode of Operation To Adjust TemperatureTo Adjust FAN Speed Smart Center Electronic Control CenterTo SET the Timer Testing the Electronic ControlTesting the Electronic Control Error Code Listings To SET Hour ClockTest Thermostat SQ & KQ Models See FigureThermostat YQ Model Only See Figure Thermostat Models ES, YS, EM, YM, EL, YL See FigureThermostat Adjustment Defrost Thermostat Heat Pump Models OnlyThermostat Bulb Location Defrost Bulb Location Heat Pump Models Only CAPACITOR, RUN See FigureCapacitor Test Check Valve Operation Heat Pumps Reversing Valve See FigureTesting Reversing Valve Solenoid Coil Heat Pump Models Only See FigureTo Test VALVE, Drain PAN See Figure Heating Element See FigureSealed Refrigeration System Repairs Equipment RequiredHermetic Component Replacement Special Procedure in the Case Compressor Motor BurnoutRotary Compressor Special Troubleshooting and Service Equipment Must be CapableUndercharged Refrigerant Systems Method of ChargingOvercharged Refrigerant Systems Restricted Refrigerant System Routine Maintenance Troubleshooting Touch Test Chart To Service Reversing Valves Troubleshooting Cooling Problem To CorrectProblem Possible Cause To Correct Cycles Problem Possible Cause To Correct Troubleshooting Heating Heat pumps Problem Possible Cause To Correct Off and the electric element is energized Troubleshooting Heating Cooling/Electric Models Troubleshooting Chart Cooling System Cools When Heating is Desired YESModels SQ06J10B-B, SQ06J10B-A, SQ08J10C-A, SQ08J10D-A Models KQ08J10B-1, KQ08J10B-A, KQ08J10C-A Schematic Model YQ06J10B-AModel SC06H10D 619-405-06 SL28J30B-A, SL35J30-A, SL35J30-B AlternateConductor Or Brown RED Blue To Capacitor Bracket Wiring Diagram YS12J33-A, YM18J34B-A, YL24J35C-A Model EQ08J11-A, EQ08J11-B IDT Ovld Neutral WE09A33E-B, WE12A33E-A, WE15A33-A WY09A33F-A, WY12A33G-A Testing The Electronic Control XQ Boards & QME Boards Checking Room TemperatureFriedrich AIR Conditioning CO

racservmn specifications

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