Mitsumi electronic PKA-A18HA4, PKA-A12HA4 Safety Precaution, Always Observe for Safety

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2 SAFETY PRECAUTION

2-1. ALWAYS OBSERVE FOR SAFETY

Before obtaining access to terminal, all supply circuits must be disconnected.

2-2. CAUTIONS RELATED TO NEW REFRIGERANT

Cautions for units utilising refrigerant R410A

Use new refrigerant pipes.

Make sure that the inside and outside of refrige- rant piping is clean and it has no contaminants such as sulfur, oxides, dirt, shaving particles, etc, which are hazards to refrigerant cycle.

In addition, use pipes with specified thickness.

Contamination inside refrigerant piping can cause deterio- ration of refrigerant oil etc.

Store the piping to be used indoors during installation, and keep both ends of the piping sealed until just before brazing. (Leave elbow joints, etc. in their packaging.)

If dirt, dust or moisture enters into refrigerant cycle, that can cause deterioration of refrigerant oil or malfunction of com- pressor.

Do not use refrigerant other than R410A.

If other refrigerant (R22 etc.) is used, chlorine in refrige- rant can cause deterioration of refrigerant oil etc.

Use a vacuum pump with a reverse flow check valve.

Vacuum pump oil may flow back into refrigerant cycle and that can cause deterioration of refrigerant oil etc.

Use the following tools specifically designed for use with R410A refrigerant.

The following tools are necessary to use R410A refrigerant.

 

Tools for R410A

Gauge manifold

 

Flare tool

Charge hose

 

Size adjustment gauge

Gas leak detector

 

Vacuum pump adaptor

Torque wrench

 

Electronic refrigerant

 

 

charging scale

The refrigerant oil applied to flare and flange connections must be ester oil, ether oil or alkylbenzene oil in a small amount.

If large amount of mineral oil enters, that can cause deterio- ration of refrigerant oil etc.

Handle tools with care.

If dirt, dust or moisture enters into refrigerant cycle, that can cause deterioration of refrigerant oil or malfunction of com- pressor.

Charge refrigerant from liquid phase of gas cylinder.

If the refrigerant is charged from gas phase, composition change may occur in refrigerant and the efficiency will be lowered.

Do not use a charging cylinder.

If a charging cylinder is used, the composition of refrigera- nt will change and the efficiency will be lowered.

Ventilate the room if refrigerant leaks during operation. If refrigerant comes into contact with a flame, poisonous gases will be released.

[1]Cautions for service

(1)Perform service after recovering the refrigerant left in unit completely.

(2)Do not release refrigerant in the air.

(3)After completing service, charge the cycle with specified amount of refrigerant.

(4)When performing service, install a filter drier simultaneously. Be sure to use a filter drier for new refrigerant.

[2]Additional refrigerant charge

When charging directly from cylinder

·Check that cylinder for R410A on the market is syphon type.

·Charging should be performed with the cylinder of syphon stood vertically. (Refrigerant is charged from liquid phase.)

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Contents Parts Catalog OCB483 ContentsPUZ-A18/24/36NHA4-BS PUY-A12/18/24/36NHA4 Service Ref PUZ-A18/24/36NHA4Remote controller Optional parts Reference ManualAlways Observe for Safety Safety PrecautionPart Names and Functions Refrigerant recovery equipmentOperation Section Display SectionTimer display Operation Mode displayMode Select button Temperature setting displayService Ref SpecificationsPKA-A12HA4 PKA-A18HA4 Noise Criterion CurvesUnit inch mm Outlines and DimensionsTB5 Wiring DiagramHeat exchanger Refrigerant System DiagramTroubleshooting TroubleshootingMALFUNCTION-DIAGNOSIS Method by Remote Controller Wired remote controllerCase of trouble during operation U9,UH Remote controller wire short Wired remote controller LED 1, 2 PCB in outdoor unitUnit’s power terminal block L1, L2, GR Appear even when operationSELF-DIAGNOSIS Action Table Operating Pipe temperatureCondenser-Evaporator TH5 Cause Countermeasure Pipe temperature thermistorRemote controller transmission ErrorE0/signal receiving errorE4Indoor/outdoor unit communication Error Signal receiving errorError Transmitting error Remote controller control boardController Troubleshooting by Inferior PhenomenaPhenomena Cause Countermeasure 1Upward/downward vane Performance failureCooling Only type When the remote controller cannot be usedEmergency Operation Heat pump typeThermistor HOW to Check the Parts PKA-A12HA4 PKA-A18HA4Lower temperature Condenser/evaporator temperatureSensor signal check Test Point Diagram Functions of DIP Switch and Jumper Wire System constraint Special FunctionOperation Rotation function and Back-up function Outline of functions2nd unit Cut-out Request Code ListRotation setting 2nd stage cut-in settingOutline of functions How to connectSetting method of each function by wired remote controller BACK-UP Heating Function CN152Forward to remove the front panel. See Photo Disassembly ProcedureOperation Procedure Photos & Illustrations PhotoOperation Procedure Photos Operation Procedure Removing the Nozzle Assembly with Vane PhotoVane Motor and Drain Hose Board Remove the room temperature thermistorDisconnect the connector CN20 on the indoor controller Remove the electrical box coverPage Page Page New publication, effective Nov

PKA-A18HA4, PKA-A12HA4 specifications

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