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Wiring Error Check Function SiUS121827E
250 Part 7 Trial Operation and Field Settings
Notes
Details Wiring error check is realized by feeding refrigerant one by one through each piping port and
detecting indoor heat exchanger temperature with the indoor heat exchanger thermistor in each
room to see if the temperature changes in correct order.
During wiring error check, freezing (cracking) noise may be heard from the indoor unit. This is
not a malfunction. The noise is generated by the heat exchanger that is cooled below 0°C
(32°F) to make temperature change more visible.
Indoor fan motor turns on and off during wiring error check.
Wiring error check result is indicated using service monitor LEDs when all the checking procedures
are completed. LEDs stop blinking when the system returns to the normal operation.
In a multi system with 2 ports (Port A and Port B), LED 1 and LED 2 indicate wiring to Room A and
Room B respectively. The LED that blinks first and second indicate piping Port A and Port B
respectively.
Ex: Suppose the LED indicators are blinking as follows.
In this example, Port A and wiring to Room B are connected to the same room and Port B and
wiring to Room A are connected to another room. Incorrect wiring is then corrected automatically.
1. Wrongly connected liquid and gas pipes cannot be self-corrected. Be sure to make the liquid
pipe and the gas pipe in pairs.
2. To cancel the wiring error check procedure halfway, press the wiring error check switch again.
In this case, the memory of the microcomputer returns to its initial status (Room A wiring → Port
A piping, Room B wiring → Port B piping).
3. When replacing the outdoor unit PCB, be sure to use this function.
4. Make the priority room setting after wiring error check. If you set the priority room before wiring
error check, the prioritized room may be changed after self-correction.
A 1 2 3 4 5
Green Red
Green Red
Green Red
A 1 2 3 4 5
A 1 2 3 4 5
(R22004)
L
E
D
L
E
D
L
E
D
Wiring
Outdoor unit
Indoor unit
Piping
(R22274)
Wiring
Piping
A
B
A
B
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