Mitsumi electronic PKA-A18HA4, PKA-A12HA4 service manual Operating, Pipe temperature

Page 17

Error Code Abnormal point and detection method

Cause

Countermeasure

 

Freezing/overheating protection is

(Cooling or drying mode)

(Cooling or drying mode)

 

operating

Clogged filter (reduced airflow)

Check clogs of the filter.

 

Freezing protection (Cooling mode)

Short cycle of air path

Remove blockage.

 

The unit is in 6-minute resume prevention

Low load (low temperature)

 

 

mode if pipe <liquid or condenser/evapo-

operation out of the tolerance

 

 

rator> temperature stays under

 

 

range

 

 

the compressor started. Abnormal if it

Defective indoor fan motor

Refer to 9-6.

 

• Fan motor is defective.

 

 

 

 

 

again within 16 minutes after 6-minute

• Indoor controller board is defec-

 

 

resume prevention mode.

tive.

Check outdoor fan motor.

 

 

Defective outdoor fan control

 

 

Overcharge of refrigerant

Check operating condition of refrigerant

 

 

Defective refrigerant circuit

circuit.

 

 

(clogs)

 

 

Overheating protection (Heating mode)

(Heating mode)

(Heating mode)

 

Clogged filter (reduced airflow)

Check clogs of the filter.

 

The units is in 6-minute resume

 

Short cycle of air path

Remove blockage.

 

prevention mode if pipe <liquid or

 

Overload (high temperature)

 

P6

condenser/evaporator> temperature is

 

operation out of the tolerance

 

detected as over 70°C[158°F] after the

 

 

range

 

 

compressor started. Abnormal if the

 

 

Defective indoor fan motor

Refer to 9-6.

 

temperature of over 70°C[158°F] is

 

• Fan motor is defective.

 

 

detected again within 10 minutes after

 

 

• Indoor controller board is defec-

 

 

6 minute resume prevention mode.

 

 

tive.

 

 

 

Check outdoor fan motor.

 

 

Defective outdoor fan control

 

 

Overcharge of refrigerant

~ Check operating condition of refrigerant

 

 

Defective refrigerant circuit

circuit.

 

 

(clogs)

 

 

 

Bypass circuit of outdoor unit

 

 

 

is defective.

 

 

Pipe temperature

 

Slight temperature difference

~ Check pipe <liquid or condenser/evap-

 

 

<Cooling mode>

 

between indoor room

orator> temperature with room tempera-

 

Detected as abnormal when the pipe tem-

temperature and pipe <liquid

ture display on remote controller and

 

 

perature is not in the cooling range 3 min-

or condenser/evaporator>

outdoor controller circuit board.

 

 

utes after compressor start and 6 minutes

temperature thermistor

Pipe <liquid or condenser/evaporator>

 

after the liquid or condenser/evaporator pipe

• Shortage of refrigerant

temperature display is indicated by set-

 

is out of cooling range.

 

• Disconnected holder of pipe

ting SW2 of outdoor controller circuit

 

 

Note 1) It takes at least 9 minutes to detect.

<liquid or condenser/

board as follows.

 

 

Note 2) Abnormality P8 is not detected in

evaporator> thermistor

 

)

 

drying mode.

 

• Defective refrigerant circuit

Conduct temperature check with outdoor

 

Cooling range : -

(TH-TH1)

Converse connection of

controller circuit board after connecting

 

TH: Lower temperature between liquid pipe

extension pipe (on plural units

(‘A-Control Service Tool(PAC-SK52ST)’.

 

temperature (TH2) and condenser/

connection)

 

 

 

evaporator temperature (TH5)

Converse wiring of indoor/

Check converse connection of extension

 

TH1: Intake temperature

 

outdoor unit connecting wire

pipe or converse wiring of indoor/outdoor

P8

<Heating mode>

 

(on plural units connection)

unit connecting wire.

 

 

Defective detection of indoor

 

 

 

When 10 seconds have passed after the

room temperature and pipe

 

 

 

compressor starts operation and the hot

<condenser/evaporator>

 

 

 

adjustment mode has finished, the unit is

temperature thermistor

 

 

 

detected as abnormal when condenser/

Stop valve is not opened

 

 

 

evaporator pipe temperature is not in heat-

completely.

 

 

 

ing range within 20 minutes.

 

 

 

 

 

Note 3) It takes at least 27 minutes to

 

 

 

 

detect abnormality.

 

 

 

 

 

Note 4) It excludes the period of defrosting

 

 

 

 

(Detection restarts when defrosting

 

 

 

 

mode is over)

 

 

 

 

 

Heating range :

(TH5-TH1)

 

 

 

17

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Contents Parts Catalog OCB483 ContentsRemote controller Optional parts Service Ref PUZ-A18/24/36NHA4Reference Manual PUZ-A18/24/36NHA4-BS PUY-A12/18/24/36NHA4Always Observe for Safety Safety PrecautionPart Names and Functions Refrigerant recovery equipmentOperation Section Display SectionMode Select button Operation Mode displayTemperature setting display Timer displayService Ref SpecificationsPKA-A12HA4 PKA-A18HA4 Noise Criterion CurvesUnit inch mm Outlines and DimensionsTB5 Wiring DiagramHeat exchanger Refrigerant System DiagramTroubleshooting TroubleshootingCase of trouble during operation MALFUNCTION-DIAGNOSIS Method by Remote ControllerWired remote controller U9,UH Unit’s power terminal block L1, L2, GR Wired remote controller LED 1, 2 PCB in outdoor unitAppear even when operation Remote controller wire shortSELF-DIAGNOSIS Action Table Operating Pipe temperatureRemote controller transmission Cause Countermeasure Pipe temperature thermistorErrorE0/signal receiving errorE4 Condenser-Evaporator TH5Error Transmitting error Error Signal receiving errorRemote controller control board Indoor/outdoor unit communicationPhenomena Cause Countermeasure 1Upward/downward vane Troubleshooting by Inferior PhenomenaPerformance failure ControllerEmergency Operation When the remote controller cannot be usedHeat pump type Cooling Only typeLower temperature HOW to Check the Parts PKA-A12HA4 PKA-A18HA4Condenser/evaporator temperature ThermistorSensor signal check Test Point Diagram Functions of DIP Switch and Jumper Wire Operation Special FunctionRotation function and Back-up function Outline of functions System constraintRotation setting Request Code List2nd stage cut-in setting 2nd unit Cut-outSetting method of each function by wired remote controller How to connectBACK-UP Heating Function CN152 Outline of functionsOperation Procedure Photos & Illustrations Disassembly ProcedurePhoto Forward to remove the front panel. See PhotoOperation Procedure Photos Vane Motor and Drain Hose Operation ProcedureRemoving the Nozzle Assembly with Vane Photo Disconnect the connector CN20 on the indoor controller Remove the room temperature thermistorRemove the electrical box cover BoardPage Page Page New publication, effective Nov

PKA-A18HA4, PKA-A12HA4 specifications

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