Wiring Error Check Function
SiBE121021_C
442
Trial Operation and Field Settings
Basic Knowledge
Refrigerant flows from Port A and on. The temperatures of the indoor heat exchanger
thermistors are detected one by one to check up the matching between the piping and
wiring.
With this function on, freezing (crackling) noise may be heard from the indoor unit. This is
not a problem. (This is because the heat exchanger temperature is made to drop below 0°C
in order to increase the detection accuracy.)
The indoor fan is made to turn on and off at the same time.
Checking the
current setting
data on the
microcomputer
memory
Those data can be checked by looking at the service monitor LED indicators, when the wiring
error checking is over, during forced operation, at the stop of the system.
The LED indicators stop blinking when the forced operation is over.
LED1…Room A wiring, LED2…Room B wiring
1st blinking LED…Port A piping, 2nd blinking LED…Port B piping
The 1st blinking LED means the room that is connected with Port A. The 2nd blinking LED
means the one connected with Port B.
Example
Ex.) Suppose the LED indicators are blinking as follows.
The above means that Port A is connected with Port B, and Port B with Room A (or self-
corrected this way.)
L
E
D
A 1 2 3 4
Green Red
Green Red
Green Red
L
E
D
A 1 2 3 4
L
E
D
A 1 2 3 4
(R8252)
A
B
Wiring
Piping
A
B
(R8253)
Wiring
Piping
