Friedrich racservmn service manual Troubleshooting Heating Heat pumps

Page 40

Troubleshooting: Heating (Heat pumps)

PROBLEM

POSSIBLE CAUSE

TO CORRECT

 

 

 

 

 

 

 

Thermostat setting.

Set thermostat to a warmer position.

No heating — fan

Defective thermostat.

Replace — do not attempt to adjust.

operates.

Compressor not operating.

Check compressor wiring. Check for open internal

 

 

or external overload. Check wiring.

 

Defective system switch.

Test system switch

PROBLEM

POSSIBLE CAUSE

TO CORRECT

 

 

 

 

Restricted filter.

Clean as recommended in Owner’s Manual.

Insufficient heating.

Outdoor thermostat.

Check if outdoor thermostat is energizing the heating

(Applicable models.)

element at its predetermined temperature setting

 

 

 

Check control setting.

 

Fresh air or exhaust door open.

 

PROBLEM

POSSIBLE CAUSE

TO CORRECT

 

 

 

Fan operates in

Inoperative system switch.

Check continuity of switch.

"constant" position, but

 

 

Incorrect wiring.

Check applicable wiring diagram.

not in "automatic"

(MoneySaver).

 

 

 

 

 

PROBLEM

POSSIBLE CAUSE

TO CORRECT

 

 

 

 

Temperature varies from

Defective thermostat.

Incorrect differential setting. Replace thermostat.

Heat anticipator (resistor) shorted.

Check voltage to resistor. If voltage okay, remove

comfortable to overly

(Applicable models)

resistor from thermostat bulb block. With current on,

warm.

 

feel resistor for warmth. If no heat can be felt,

 

 

replace anticipator.

PROBLEM

POSSIBLE CAUSE

TO CORRECT

 

 

 

 

Heat anticipator (resistor) shorted.

Disconnect power to unit. Remove resistor from

 

(Applicable models.)

thermostat bulb block. Plug in unit and allow to

Room temperature

 

operate. Feel resistor for heat. If no heat is felt,

uneven.

 

replace resistor.

(Heating cycle)

Wide differential — partial loss of ther-

Replace thermostat and check.

 

mostat bulb charge.

 

 

Incorrect wiring.

Refer to appropriate wiring diagram. Resistor is

 

 

energized during the "on" cycle of compressor or

 

 

fan.

PROBLEM

POSSIBLE CAUSE

TO CORRECT

 

 

 

 

Incorrect wiring.

Refer to appropriate wiring diagram.

 

Defrost control timer motor not advanc-

Check for voltage at "TM" and "TM1" on timer. If

Unit will not defrost.

ing.

voltage, replace control.

Defrost control out of calibration.

If outside coil temperature is 25° F or below, and

 

 

 

preselected time limit has elapsed, replace the

 

 

defrost control.

 

Defrost control contacts stuck.

If the contacts remain closed between terminals "2"

 

 

and "3" of the defrost control after preselected time

 

 

interval has passed, replace control.

 

Defrost control bulb removed from coil,

Reinstall and assure that good bulb to coil contact is

 

or not making good coil contact.

made.

 

 

 

40

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Contents 2003 Table of Contents RAC Serial Number Identification Guide 1st Digit Function00001 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 SC06H10EBtuh WY09A33F-A WY12A33F-A HeatingAmps Refrigeration System Sequence of Operation Wire Size Fuse/CircuitBreaker GroundingWinding Test Thermal Overload ExternalChecking Compressor Efficiency Terminal Overload Test Terminal Overload InternalChecking the Internal Overload FAN MotorResistor System Control Panel System Control Panel KQ Models Only- See FigureEQ 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 FigureDefrost Thermostat Heat Pump Models Only Thermostat AdjustmentThermostat Bulb Location CAPACITOR, RUN See Figure Defrost Bulb Location Heat Pump Models OnlyCapacitor Test Check Valve Operation Heat Pumps Reversing Valve See FigureSolenoid Coil Heat Pump Models Only See Figure Testing Reversing ValveTo 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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