Mitsumi electronic HOW to Check the Parts PKA-A12HA4 PKA-A18HA4, Thermistor, Lower temperature

Page 22

9-6. HOW TO CHECK THE PARTS PKA-A12HA4 PKA-A18HA4

Parts name

 

 

 

 

 

 

Check points

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Room temperature

 

Disconnect the connector then measure the resistance with 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 with a tester. (Coil temperature 77"F)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Red

 

M

 

 

 

Normal

 

 

Abnormal

 

Yellow

 

 

 

 

 

 

-

 

-

-

 

-

 

 

 

 

 

 

 

 

 

 

 

 

Brown

 

 

 

 

 

 

Brown-Red

Brown-Orange

Brown-Yellow

 

Brown-Green

Open or short

 

 

 

Orange Green

 

 

 

Connect pin No.

 

 

 

350 ± 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 Contents Parts Catalog OCB483Reference Manual Service Ref PUZ-A18/24/36NHA4Remote controller Optional parts PUZ-A18/24/36NHA4-BS PUY-A12/18/24/36NHA4Safety Precaution Always Observe for SafetyRefrigerant recovery equipment Part Names and FunctionsDisplay Section Operation SectionTemperature setting display Operation Mode displayMode Select button Timer displaySpecifications Service RefNoise Criterion Curves PKA-A12HA4 PKA-A18HA4Outlines and Dimensions Unit inch mmWiring Diagram TB5Refrigerant System Diagram Heat exchangerTroubleshooting TroubleshootingWired remote controller MALFUNCTION-DIAGNOSIS Method by Remote ControllerCase of trouble during operation U9,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 typeCondenser/evaporator temperature HOW to Check the Parts PKA-A12HA4 PKA-A18HA4Lower temperature ThermistorSensor signal check Test 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 functionsPhoto Disassembly ProcedureOperation Procedure Photos & Illustrations Forward to remove the front panel. See PhotoOperation Procedure Photos Removing the Nozzle Assembly with Vane Photo Operation ProcedureVane Motor and Drain Hose Remove the electrical box cover Remove the room temperature thermistorDisconnect the connector CN20 on the indoor controller BoardPage Page Page New publication, effective Nov

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