Mitsumi electronic PKA-A12HA4, PKA-A18HA4 service manual Remove the electrical box cover, Board

Page 32

 

OPERATION PROCEDURE

 

 

PHOTOS

 

 

 

 

 

 

 

8. REMOVING THE LIQUID PIPE THERMISTOR AND

Photo 12

 

 

Condenser/evaporator temp.

COND/EVA TEMP. THERMISTOR

 

 

 

thermistor (TH5)

(1) Remove the front panel. (Refer to step 2)

Heat exchanger

 

 

 

 

 

 

(2) Remove the electrical box cover.

 

 

 

 

 

 

 

 

 

 

 

 

 

(3) Remove the motor band.

 

 

 

 

 

 

 

(4) Cut the wiring fixed band.

 

 

 

 

 

 

 

(5) Remove the liquid pipe thermistor and cond/eva temp. ther-

 

 

 

 

 

 

 

 

mistor.

 

 

 

 

 

 

 

(6) Disconnect the connector (CN44) on the indoor

 

 

 

 

 

 

 

 

controller board.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Liquid pipe thermistor (TH2)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

9. REMOVING THE HEAT EXCHANGER

Photo 13

 

 

 

 

 

 

(1)

Remove the front panel (Refer to step 2) and the corner

 

 

 

 

 

 

 

 

 

Electrical box cover (side)

 

panel at right lower side.

 

 

 

(2)

Remove the electrical box (Refer to step 4) and the nozzle

Heat exchanger

 

Electrical box cover (top)

 

Screw (side cover)

 

 

 

assembly (Refer to step 5).

 

 

 

 

 

Water cover

Screw (top cover)

 

 

(3)

Remove the motor band.

 

 

 

 

 

 

 

 

 

 

 

 

(4)

Remove the pipe thermistors (Refer to step 8).

 

 

 

 

 

 

 

(5)

Disconnect the connector (CN60) on the indoor controller

 

 

 

 

 

 

 

 

board and the connector for ground wire. (See Photo 5)

 

 

 

 

 

 

 

(6)

Remove the screws fixing the left side of the heat

 

 

 

 

 

 

 

 

exchanger. (See Photo 9)

 

 

 

 

 

 

 

(7)

Remove the heat exchanger.

 

 

 

 

 

 

 

 

 

 

 

Switch board cover

Screw

 

 

Nozzle assembly

Holder of

(side

 

 

cover)

 

 

 

 

 

 

IR wireless

 

 

 

 

 

 

 

 

controller board

 

 

 

 

 

 

 

 

10. REMOVING THE ROOM TEMPERATURE THERMISTOR

Photo 14

 

 

 

 

 

 

(1)

Remove the front panel (Refer to step 2).

 

 

 

 

 

 

 

Screw (side cover) Electrical box

(2)

Remove the electrical box cover.

Screw (top cover)

(3)

Remove the room temperature thermistor.

 

 

 

cover (top)

 

 

 

 

 

 

 

(4)

Disconnect the connector (CN20) on the indoor controller

 

 

 

 

 

Electrical box

 

board.

 

 

 

 

 

cover (side)

 

 

 

 

 

 

 

Room temp.

 

 

 

 

 

 

 

thermistor

 

 

 

 

 

 

 

(TH1)

 

 

 

 

 

 

 

Thermistor

 

 

 

 

 

 

 

holder

 

 

 

 

 

 

 

Screw

 

 

 

 

 

 

 

(side cover)

 

 

Nozzle assembly

Switch holder

Holder of

 

 

 

 

 

 

IR wireless

 

 

 

 

 

 

controller board

 

 

 

 

 

 

 

 

 

32

Image 32
Contents Contents Parts Catalog OCB483Service Ref PUZ-A18/24/36NHA4 Remote controller Optional partsReference Manual PUZ-A18/24/36NHA4-BS PUY-A12/18/24/36NHA4Safety Precaution Always Observe for SafetyRefrigerant recovery equipment Part Names and FunctionsDisplay Section Operation SectionOperation Mode display Mode Select buttonTemperature setting display Timer displaySpecifications Service RefNoise Criterion Curves PKA-A12HA4 PKA-A18HA4Outlines and Dimensions Unit inch mmWiring Diagram TB5Refrigerant System Diagram Heat exchangerTroubleshooting TroubleshootingCase of trouble during operation MALFUNCTION-DIAGNOSIS Method by Remote ControllerWired remote controller U9,UH Wired remote controller LED 1, 2 PCB in outdoor unit Unit’s power terminal block L1, L2, GRAppear even when operation Remote controller wire shortSELF-DIAGNOSIS Action Table Pipe temperature OperatingCause Countermeasure Pipe temperature thermistor Remote controller transmissionErrorE0/signal receiving errorE4 Condenser-Evaporator TH5Error Signal receiving error Error Transmitting errorRemote controller control board Indoor/outdoor unit communicationTroubleshooting by Inferior Phenomena Phenomena Cause Countermeasure 1Upward/downward vanePerformance failure ControllerWhen the remote controller cannot be used Emergency OperationHeat pump type Cooling Only typeHOW to Check the Parts PKA-A12HA4 PKA-A18HA4 Lower temperatureCondenser/evaporator temperature ThermistorSensor signal check Test Point Diagram Functions of DIP Switch and Jumper Wire Special Function OperationRotation function and Back-up function Outline of functions System constraintRequest Code List Rotation setting2nd stage cut-in setting 2nd unit Cut-outHow to connect Setting method of each function by wired remote controllerBACK-UP Heating Function CN152 Outline of functionsDisassembly Procedure Operation Procedure Photos & IllustrationsPhoto Forward to remove the front panel. See PhotoOperation Procedure Photos Vane Motor and Drain Hose Operation ProcedureRemoving the Nozzle Assembly with Vane Photo Remove the room temperature thermistor Disconnect the connector CN20 on the indoor controllerRemove the electrical box cover BoardPage Page Page New publication, effective Nov

PKA-A18HA4, PKA-A12HA4 specifications

Mitsumi Electric Company is known for its innovations in the electronic components sector, and among its noteworthy products are the PKA-A18HA4 and PKA-A12HA4 components. Both models represent advancements in their respective categories, characterized by reliability, high performance, and cutting-edge technology.

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