Use ester oil, essential oil or alkylbenzene oil (a small amount) as the cooling oil applied to the fittings and flange connections. If the refrigerant is charged from the gas phase, the composition of the refrigerant may change and the efficiency will decrease. If you use another refrigerant (R22, etc.), the chlorine in the refrigerant may cause deterioration of the refrigerant oil, etc.
Vacuum pump oil can be returned to the coolant cycle and this can cause deterioration of the coolant oil etc. If dirt, dust or moisture enters the refrigerant circuit, it can cause deterioration of the refrigerant oil or compressor malfunction. If a large amount of mineral oil is introduced, it may cause deterioration of the cooling oil, etc.
For the purposes of this explanation, all parts of the display are shown as lit. During actual operation, only the relevant points will be lit. Identifies the current operation Shows the operating mode, etc. If the simple or Auto Off timer is set, the time to turn off is displayed. The room temperature display range is 8–39˚C. The display will flash if the temperature is less than 8˚C or 39˚C or more.
Built-in temperature sensor Appears if the airflow is set to. low or low during COOL or DRY mode.
SOUND PRESSURE LEVELS
5-1. Sound pressure level
5-2. NC curves
6 OUTLINES & DIMENSIONS
INDOOR UNIT
7 WIRING DIAGRAM
8 REFRIGERANT SYSTEM DIAGRAM
TROUBLESHOOTING
9-1. CAUTIONS ON TROUBLESHOOTING
Wired remote controller (1) Turn on the power
If the unit cannot be operated properly after a trial run, refer to the following table to correct the cause. About 2 minutes after power on, the remote control cannot be operated due to system startup. Refer to the following table for a description of each LED (LED1, 2, 3) available on the internal controller.
This LED lights only in the case of the indoor unit connected to the outdoor unit's refrigerant address "0".
Wireless remote controller
If the unit cannot be operated properly after completing the above test run, refer to the following table to correct the cause. Messages on the screen do not appear even when the operation switch is in the ON position (the operation lamp is off). About 2 minutes after power on, the remote control cannot be operated due to system startup.
Output pattern B] Errors detected by a unit other than the indoor unit (outdoor unit, etc.) Wireless remote controller. Compressor overcurrent cut/abnormal from power module Abnormality of overheating due to low discharge temperature Abnormality such as overvoltage or undervoltage and abnormal synchronous signal to main circuit/current sensor error. Pipe sensor error (liquid or 2-phase pipe) Indoor/outdoor unit communication error Drain sensor error.
1 If the beeper does not sound after the first two beeps to confirm the received signal to start the self-test and the OPERATION INDICATOR lamp does not light up, there are no error records. 2 If the beeper sounds three times continuously "beep, beep, beep sec.)" after the first two beeps to confirm that the self-test start signal has been received, the specified refrigerant address is incorrect.
AUTO RESTART FUNCTION
If there is an extreme difference from the actual
2 Abnormal if the auxiliary remote controller could not receive any signal for two minutes. 1 Abnormal if the indoor controller board cannot normally receive any data from the remote controller board or other indoor controller board for three minutes. 1 Check for disconnection or looseness of the indoor unit or the transmission wire of the remote control. 2 Set one of the remote controls to "main".
If the unit is not normal after replacing indoor controller board in group control, indoor controller board of address “0”. 2 Indoor controller board simultaneously receives sent data, compares the data, and when detected, judges different data as abnormal 30 consecutive times. When it becomes abnormal again, replace internal control board. b) When “RC NG” is displayed, replace remote controller. c) When “RC E3” or “ERC 00-66” is displayed, noise may cause abnormalities.
In this case, E0 is displayed on remote controller, and E4 is displayed by LED (LED1, LED2) on the outdoor control circuit board. 3 Incorrect wiring of remote control 4 Defective transmitting and receiving. circuit of remote control 5Defective transmission of reception. circuit of indoor controller board of refrigerant address “0”. 2Defective send-receive circuit of indoor controller board 3Defective send-receive. circuit of indoor controller board 4Gaas entered/. Check the LED display on the external control circuit board. Other indoor controller board may have defects in case of two triple indoor unit system.
3 Consider the unit abnormal under the following condition: When two or more indoor units are connected to an outdoor unit, indoor controller board cannot receive a signal from outdoor control circuit board for three minutes, a signal that allows outdoor control circuit board to receive signals send . Abnormal if data cannot be read normally from the non-volatile memory of the indoor controller board. 3 Check room temperature display on remote controller and indoor pipe
9-4. TROUBLESHOOTING BY INFERIOR PHENOMENA
9-5. TEST POINT DIAGRAM
9-6. TROUBLE CRITERION OF MAIN PARTS
9-7. Thermistor
Do not pull out the motor connector (CNMF) when the power is on. It causes problems with the internal controller PCB and the fan motor.) Self-check. NG Wiring contact check Fan motor connector contact (CNMF) Check the fuse (FUSE) on the indoor controller board. Power Check (Remove the connector (CNMF)) Measure the voltage on the internal controller circuit.
Check method of DC fan motor (fan motor/indoor controller circuit board)
The pair number settings of the wireless remote controller and the indoor control circuit board (J41/J42) are shown in the table on the left. in the table indicates that the jumper line is disconnected.).
9-9. FUNCTIONS OF DIP SWITCH AND JUMPER WIRE
Each function is controlled by the dip switch and the jumper wire on control p.c. board
SW1 and SW2 are equipped only for service parts
Model setting and capacity setting are memorized in the nonvolatile memory of the control p.c. board of the unit
Control box
Thermistor (Intake air)
DISASSEMBLY PROCEDURE
Drainpan
Removing the filter and bottom plate (1) Push up on the filter tab and pull it out. filter in the direction of arrow 1. 2) Remove the fixing screws on the bottom plate (D), (E) to remove it.
Thermistor (Condenser/evaporator) (Liquid pipe)
Removing the fan motor and Sirocco fan (1) Remove the two motor fixing screws. remove the motor and the Sirocco fan in the direction of arrow 3. 2) Remove the four fan housing fixing screws to remove the top half of the fan housing. Removing the fan housing (lower half). 1) Squeeze the tabs on the fan housing to remove it in the direction of the arrow 2. Removing the filter and base plate (1) Push the tab on the filter down and pull it out. the filter in the direction of arrow 1. 2) Remove the fixing screws of the base plate (J) to remove it.
Heat exchanger
