Mitsubishi Electronics PKA-A24KA4.TH, PKA-A36KA4.TH Lower temperature, Thermistor TH5

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9-6. HOW TO CHECK THE PARTS

PKA-A24KA4.TH PKA-A30KA4H.TH PKA-A36KA4.TH

Parts name

 

 

 

 

 

 

Check points

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Room temperature

 

Disconnect the connector then measure the resistance using a tester.

thermistor

 

(TH1)

 

(At the ambient temperature 50"F~86"F)

 

 

 

 

Liquid pipe thermistor

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(TH2)

 

Normal

 

Abnormal

 

(Refer to the next page for a detail.)

Condenser/evaporator

 

4.3k~9.6k

Open or short

 

 

 

 

 

 

temperature thermistor

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(TH5)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Vane motor (MV)

 

Measure the resistance between the terminals using a tester. (Coil temperature 68"F)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Red

 

M

 

 

 

Normal

 

 

Abnormal

 

Yellow

 

 

 

 

 

 

-

 

-

-

 

-

 

 

 

 

 

 

 

 

 

 

 

 

Brown

 

 

 

 

 

 

Brown-Red

Brown-Orange

Brown-Yellow

 

Brown-Green

Open or short

 

 

 

Orange Green

 

 

 

Connect pin No.

 

 

 

250 ± 7%

 

 

 

 

 



 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Fan motor (MF)

Refer to 9-6-2.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

9-6-1. Thermistor

<Thermistor Characteristic graph>

 

 

Room temperature thermistor (TH1)

 

Thermistor for

 

Pipe temperature thermistor/liquid (TH2)

 

lower temperature

 

 

Condenser/evaporator temperature

 

 

thermistor (TH5)

Thermistor R0=15k

± 3%

 

 

 

 

 

 

 

 

 

 

 

 

Fixed number of B=3480 ± 2%

 

 

 

 

 

 

 

 

1

 

 

 

 

 

 

1

 

 

 

 

t( )Rt=15exp { 3480(

 

 

 

 

 

 

 

 

 

 

 

) }

 

273+t

 

 

273

 

 

 

 

 

 

 

 

 

1

 

 

 

 

 

 

 

 

 

1

 

 

 

 

273+

T-32

 

273

 

 

 

 

 

 

 

 

1.8

 

 

 

 

 

 

 

 

0

10

20

25

30

40

Resistance (k )

<Thermistor for lower temperature>

50

40

30

20

10

0

-20 -10 0 10 20 30 40 50 °C -4 -14 32 50 68 86 104122 °F

Temperature

22

Image 22
Contents Revised EDITION-A ContentsParts Catalog OCB488 Remote controller Optional parts Reference ManualSafety Precaution Always Observe for SafetyPart Names and Functions When charging directly from cylinderFront grille Display Section Operation SectionTemperature setting display Operation Mode displayMode Select button Timer displaySpecifications Service RefPKA-A30KA4.TH Noise Criterion CurvesPKA-A24KA4.TH PKA-A24KAL PKA-A30KALPKA-A24KA4.TH PKA-A30KA4.TH PKA-A36KA4.TH Outlines and DimensionsUnit inch mm Wiring Diagram Explanation of symbolsRefrigerant System Diagram Heat exchangerTroubleshooting TroubleshootingAccording to 9-4. Troubleshooting by inferior phenomena Wired remote controller MALFUNCTION-DIAGNOSIS Method by Remote ControllerProcedure Case of trouble during operationU9,UH Appear even when operation Wired remote controller LED 1, 2 PCB in outdoor unitUnit’s power terminal block L1, L2, GR Remote controller wire shortSELF-DIAGNOSIS Action Table Pipe temperature OperatingErrorE0/signal receiving errorE4 Cause Countermeasure Pipe temperature thermistorRemote controller transmission Condenser-Evaporator TH5Remote controller control board Error Signal receiving errorError Transmitting error Indoor/outdoor unit communicationPerformance failure Troubleshooting by Inferior PhenomenaPhenomena Cause Countermeasure 1Upward/downward vane ControllerHeat pump type When the remote controller cannot be usedEmergency Operation Cooling Only typeThermistor Lower temperatureCondenser/evaporator temperature Thermistor TH5Sensor signal check DC Fan motor fan motor/indoor controller circuit boardTest Point Diagram Functions of DIP Switch and Jumper Wire Rotation function and Back-up function Outline of functions Special FunctionOperation System constraint2nd stage cut-in setting Request Code ListRotation setting 2nd unit Cut-outBACK-UP Heating Function CN152 How to connectSetting method of each function by wired remote controller Outline of functionsBe careful when removing heavy parts Disassembly ProcedureOperation Procedure Photos & Illustrations PhotoRemoving the Nozzle Assembly with Vane Operation Procedure PhotosVane Motor and Drain Hose Remove the screw fixing motor band. See Photo Disconnect the connector CN44 on the indoor controllerRemove the panel and the corner box. Refer to step Remove the liquid pipe thermistor and cond / eva thermistorRemove the room temperature thermistor Disconnect the connector CN20 on the indoor controller Board

PKA-A36KA4.TH, PKA-A30KA4.TH, PKA-A24KA4.TH specifications

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