Wiring Error Check Function
SiSG121917E
185
Part 7 Trial Operation and Field Settings
3. Wiring Error Check Function
Outline
Wiring error check function is designed for the microcomputer to correct wiring errors itself.
If local wiring is unclear in the case of buried piping, for example, just press the wiring error
check switch on the outdoor unit. Even if the connections for Room A and Room B are
confused, the system may run without a hassle.
Note that this check function does not work in the following cases.
For 3-minute standby period after the circuit breaker is turned on.
When the outdoor temperature is below 5°C.
If the indoor unit is in trouble (also in case of all-room transmission failure).
When the piping and wiring are perfect, there is no need to use this function.
Operation
1. Press the wiring error check switch (SW3) on the service monitor PCB of the outdoor unit,
and the wiring error check function is activated.
2. In about 15 ~ 20 minutes, the check finishes automatically.
3. When the check is over, the service monitor LED indicators start blinking.
Self-correction complete…The LED indicators 1 ~ 4 (4-room model), or 1~5 (5-room model)
blink one after another.
Self-correction impossible…The LED indicators blink all at the same time.
Transmission failure occurs at any of the indoor units.
The indoor unit heat exchanger thermistor is disconnected.
An indoor unit is in trouble (if a trouble occurs during the wiring error checking).
Emergency stop…Any of the LED indicators stays on.
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
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.
LED
1
2
3
4
5
Judgment
Status
All blinking at once
Self-correction
impossible
Blinking one after another
Self-correction complete
One or more of LEDs 1 to 4 are ON
—
Abnormal stop
50/65/80 class
90 class
(R22625)
Service cover
Wiring error
check switch
(SW3)
Ser
v
ice monitor PCB
(R22960)
W
iring error
check s
w
itch
(S
W
3)
S2
S502
A
1
2
3
4
5
HEAT COOL
OFF
O
N
O
N
OFF
1234
5
