For repairs to the cooling systems, (1-3) through (1-7) must be completed before performing any work on the systems. All maintenance personnel and others working in the area should be instructed as to the nature of the work being performed. When electrical components are replaced they must be fit for purpose and to the correct specification.
This must be reported to the owner of the equipment so that all parties are informed. Before recharging the system, it must be pressure tested with the appropriate purge gas. The equipment must be marked with an indication that it has been taken out of service and emptied of refrigerant.
In addition, a set of calibrated scales should be available and in good working order. The recycled refrigerant must be returned to the refrigerant supplier in the correct recycling cylinder, and the relevant waste transfer note arranged. The evacuation process will be carried out before the compressor is returned to the suppliers.
Only electrical heating to the compressor body may be used to speed up this process.
OCH660A 11
Check code, error source, refrigerant address, unit model, serial number, contact information (dealer phone number) can be displayed. OU silent mode Used to set the time periods during which priority is given to silent operation of outdoor units over temperature control. Energy Saving Auto Return Used to make the units operate at the preset temperature after performing energy saving operation for a certain period of time.
Schedule* Set the start/stop times to run the units in energy saving mode for each day of the week, and set the energy saving percentage. Maintenance Auto-lowering panel Use this to raise and lower the auto-lowering panel (optional parts). Manual Vane Angle Use this option to set the vane angle for each vane in a fixed position.
Restriction setting • Outdoor unit silent setting • Night dimming Language selection Used to select the desired language. Request code: Details of operating data, including each thermistor temperature and fault history, can be checked.
OCH660A 13
SPECIFICATIONS4
5 NOISE CRITERION CURVES
5-1. SOUND LEVELS
5-2. NOISE CRITERION CURVES
OCH660A 15
OUTLINES AND DIMENSIONS6
WIRING DIAGRAM7
PKA-M35HA PKA-M50HA PKA-M35HA-ER PKA-M50HA-ER
OCH660A 17 17
PKA-M35HAL PKA-M50HAL PKA-M35HAL-ER PKA-M50HAL-ER
REFRIGERANT SYSTEM DIAGRAM8
OCH660A 19
9-1. TROUBLESHOOTING
TROUBLESHOOTING9
Procedure]
OCH660A 21
If the unit cannot be used properly after testing, refer to the table below to find the cause. Short remote control wire In the wireless remote control with the above condition, the following phenomena occur. For the description of each LED (LED1, 2, 3) provided on the internal controller, refer to the table below.
This LED only lights up if the indoor unit is connected to the refrigerant address “0” of the outdoor unit. LED3 (communication between indoor and outdoor units) Indicates the communication status between the indoor and outdoor units.
OCH660A 23
1 Freeze Protection (Cooling Mode) The unit is in 6-minute restart prevention mode if pipe
Abnormal if the temperature is above 70: Re-detected within 30 minutes after the 6-minute mode to prevent continuation. 1 Slight temperature difference between internal room temperature and pipe
1 Clogged filter (reduced airflow) 2 Short cycle of airway 3 Overload (high temperature). operation outside the tolerance range. Detected as abnormal when the pipe temperature is not within the cooling range 3 minutes after the compressor starts and 6 minutes after the liquid or condenser/evaporator pipe is outside the cooling range. 1–4 Check pipe
23 Check the reverse connection of the extension tube or the reverse wiring of the indoor/outdoor unit connecting wire.
OCH660A 25
2 Defective transmitter-receiver circuit of indoor controller board 3 Defective transmitter-receiver circuit of indoor controller board 4 Noise entered/. Check the LED display on the external control circuit board. Other indoor control board may have defects in case of two triple indoor unit system. Indoor/outdoor unit communication error (Signal reception error) 1 Abnormal if indoor controller board cannot receive any signal normally for 6.
Abnormal if data cannot be read normally from the non-volatile memory on the indoor controller board. Remote control transmission error(E3)/signal reception error(E5) 1 Abnormal if the remote control could not. find blank of the transmission path for 6 seconds and could not transmit. 2 The remote control receives transmitted data at the same time and compares the received and transmitted data.
2 The internal control board simultaneously receives the transmitted data and compares the received and transmitted data.
OCH660A 27
9-4. TROUBLESHOOTING OF PROBLEMS
OCH660A 29
9-5. EMERGENCY OPERATION
OCH660A 31
9-6. HOW TO CHECK THE PARTS
DC fan motor (fan motor/indoor controller circuit board) Check method of DC fan motor (fan motor/indoor controller circuit board) Check method of DC fan motor (fan motor/indoor controller circuit board) of internal controller circuit) 1 Notes. Do not pull the connector (CNMF) for the motor with the power supply on. Causes indoor controller circuit board and fan motor problems.) 2Self-check. Symptom: The fan motor does not stop when you press the stop button on the remote control.
Process: The emergency operation connector on the indoor controller board may be set to ON. Power supply check (Remove the connector (CNMF)) Measure the voltage in the indoor controller circuit board. Measure the voltage between CNMF 6 and 3 0 V DC and 15 V DC in the indoor controller circuit board.
OCH660A 33
9-7. TEST POINT DIAGRAM Indoor controller board
The pair number settings of the wireless remote controller and indoor control PCB (J41/J42) are given in the table on the left. in the table indicates that the jumper wire is disconnected.).
9-8. FUNCTIONS OF DIP SWITCH AND JUMPER WIRE
OCH660A 35
10 FUNCTION SETTING
10-1. UNIT FUNCTION SETTING BY THE REMOTE CONTROLLER
11 SPECIAL FUNCTION
OCH660A 37 37
NOTICE
DISASSEMBLY PROCEDURE12
Removing the lower side of the indoor unit from the installation plate
Removing the front panel
Removing the electrical box
Removing the nozzle assembly (with vane and vane motor) and drain hose
Removing the indoor fan motor and the line flow fan (1) Remove the front panel (Refer to procedure 2.) and the
Removing the vane motor
OCH660A 41
Removing the heat exchanger
Removing the room temperature thermistor (1) Remove the front panel (Refer to procedure 2.)
