Mitsubishi Electronics PKA-A36KA4.TH Emergency Operation, Heat pump type, Cooling Only type

Page 21

9-5. EMERGENCY OPERATION

9-5-1. When IR wireless remote controller fails or its battery is exhausted

When the remote controller cannot be used

When the batteries of the remote controller run out or the remote controller malfunctions, the emergency operation can be done using the emergency buttons.

DEFROST/STAND BY lamp (ORANGE)  Operation lamp (GREEN)

 Emergency operation switch (cooling/heating)  Receiver

 



• Each press of the emergency operation switch will toggle the





operation mode.



• Check “COOL/HEAT” with the operation monitor display. (The display will

 

 

 

appear orange for 5 seconds after pressing the emergency operation switch.)

 

 

[Heat pump type]

Cooling

Heating

Stop

[Cooling Only type]

Cooling

Stop

Operation Monitor Display

 

GREEN

ORANGE

 

 

STOP

 

 

The orange lamp follows the switch operation

 

 

 

as indicated at the left for 5 sedonds, and

COOL

 

 

 

 

then it will return to the normal display.

HEAT

 

 

 

 

 

 

OFF

ON

 

 

* Details of emergency mode are as shown below.

 

 

 

 

 

 

Operation Mode

COOL

HEAT

 

Set Temperature

24°C, 75°F

24°C, 75°F

 

Fan Speed

High

High

Airflow Direction Up and Down

Horizontal

Downward

9-5-2. When wired remote controller or indoor unit microprocessor fails

1. When the wired remote control or the indoor unit microcomputer has failed, but all other components work properly, if you set the switch (SWE) on the indoor controller board ON, the indoor unit will begin Emergency Operation. When Emergency Operation is activated, the indoor unit operates as follows:

(1)Indoor fan is running at high speed. + Note on the IR wireless remote control

When the remote control does not function, it is possible to activate Emergency Operation by using the indoor unit Emergency Operation switch.

However, if the indoor unit microprocessor has failed, it is nesessary to proceed with points 2 and 3 below as in the case of the wired remote control.

2.When you activate Emergency Operation of the cooling or heating, you have to set the switch (SWE) on the indoor controller board and activate Emergency Operation of the outdoor unit.

For details on how to activate Emergency Operation of the outdoor unit, refer to the outdoor unit wiring diagram.

3.Before you activate Emergency Operation, check the following points:

(1)Emergency operation cannot be activated when:

•the outdoor unit malfunctions. • the indoor fan malfunctions.

•when it has detected the malfunction of drain pump during self-diagnosing.

(2)Emergency Operation becomes continuous only by switching the power source on/off. ON/OFF on the remote control or temperature control etc. does not function.

(3)Avoid operating for a long time when the outdoor unit begins defrosting while Emergency Operation of the heating is activated, because it will start to blow cold air.

(4)Emergency cooling should be limited to 10 hours maximum (The indoor unit heat exchanger may freeze).

(5)After Emergency Operation has been deactivated, set the switches etc. to their original positions.

(6)Movement of the vanes does not work in Emergency operation, therefore you have to slowly set them manually to the appropriate position.

21

Page 20 Page 22
Image 21
Page 20 Page 22
Contents Contents Revised EDITION-AParts Catalog OCB488 Reference Manual Remote controller Optional partsAlways Observe for Safety Safety PrecautionWhen charging directly from cylinder Part Names and FunctionsFront grille Operation Section Display SectionMode Select button Operation Mode displayTemperature setting display Timer displayService Ref SpecificationsPKA-A24KA4.TH Noise Criterion CurvesPKA-A30KA4.TH PKA-A24KAL PKA-A30KALOutlines and Dimensions PKA-A24KA4.TH PKA-A30KA4.TH PKA-A36KA4.THUnit inch mm Explanation of symbols Wiring DiagramHeat exchanger Refrigerant System DiagramTroubleshooting TroubleshootingAccording to 9-4. Troubleshooting by inferior phenomena Procedure MALFUNCTION-DIAGNOSIS Method by Remote ControllerWired remote controller Case of trouble during operationU9,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 typeCondenser/evaporator temperature Lower temperatureThermistor Thermistor TH5DC Fan motor fan motor/indoor controller circuit board Sensor signal checkTest 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 ProcedureBe careful when removing heavy parts PhotoOperation Procedure Photos Removing the Nozzle Assembly with VaneVane Motor and Drain Hose Remove the panel and the corner box. Refer to step Disconnect the connector CN44 on the indoor controllerRemove the screw fixing motor band. See Photo Remove the liquid pipe thermistor and cond / eva thermistorDisconnect the connector CN20 on the indoor controller Board Remove the room temperature thermistor

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

Mitsubishi Electronics introduces its PKA series of commercial air conditioners, comprising models PKA-A24KA4.TH, PKA-A30KA4.TH, and PKA-A36KA4.TH. These units are designed to meet the growing demand for energy-efficient and reliable climate control solutions in commercial spaces. Each model in the series is equipped with advanced features that set them apart in the competitive air conditioning market.

One of the main features of the PKA series is the innovative inverter technology. This technology enables the air conditioning units to adjust their cooling or heating output according to the indoor temperature, leading to significant energy savings. By operating at varying speeds rather than a constant rate, the inverter system provides a more consistent and comfortable environment while reducing energy consumption by up to 30% compared to traditional fixed-speed systems.

Another standout characteristic of the PKA-A24KA4.TH, PKA-A30KA4.TH, and PKA-A36KA4.TH models is their compact design. These units are designed for easy installation in various commercial settings while taking up minimal space. This is particularly beneficial for businesses looking to optimize their floor space without compromising climate control efficiency.

The PKA series features advanced filtration technology, including a highly efficient air purification system. This enhances indoor air quality by removing dust, allergens, and other airborne pollutants, creating a healthier environment for occupants. The inclusion of a self-cleaning function also contributes to maintenance ease, as the unit automatically cleans the heat exchanger, preventing dust buildup and ensuring efficient operation.

Mitsubishi's commitment to whisper-quiet operation is another critical feature of these models. They are engineered to operate at sound levels as low as 19 dB(A), making them ideal for environments where noise control is essential, such as offices, hotels, or healthcare facilities.

Moreover, the PKA series is compatible with Mitsubishi's sophisticated control systems, allowing users to manage their air conditioning remotely via smartphone or tablet. This level of control enhances user convenience and maximizes system efficiency by enabling real-time adjustments based on occupancy and other factors.

Overall, the Mitsubishi Electronics PKA-A24KA4.TH, PKA-A30KA4.TH, and PKA-A36KA4.TH units represent a perfect blend of modern technology and user-centric design, providing businesses with effective, efficient, and quiet climate control solutions. With their advanced features, energy-saving capabilities, and emphasis on air quality, these models stand out as premier choices for managing environmental comfort in commercial applications.
Top Page Image Contents