[
VII
Troubleshooting ]
- 13 -
HWE18170
GB
1) Summary of flow control valve (FCV) operation
The FCV is operated by a stepping motor, which operates by receiving a pulse signal from the indoor control board.
The FCV position changes in response to the pulse signal.
Indoor control board and FCV connection
Pulse signal output and valve operation
The output pulse changes in the following order:
When the valve closes 1 -> 2 -> 3 -> 4 -> 1
When the valve opens 4 -> 3 -> 2 -> 1 -> 4
(A) Yellow
(G) Orange
(B) White
(H) Purple
(C) Black
(I)
Control board
(D) Brown
(J)
Connection (CN60)
(E) Green
(K) Drive circuit
(F) Blue
(L) Flow control valve
Output (phase)
number
Output status
1
2
3
4
4
ON
ON
OFF
OFF
5
OFF
ON
ON
OFF
7
OFF
OFF
ON
ON
8
ON
OFF
OFF
ON
M
(L)
(I)
(A)
(B)
(C)
(D)
(E)
(F)
(G)
(H)
(J)
(K)
5
3
2
1
4
6
7
8
12V
12V
12V
GND
6
5
6
4
3
Limit signal
(Opening
“0” signal)
2
1
7 8
Microcomputer
HWE18170.book 13 ページ ２０１９年５月８日 水曜日 午前１０時３２分
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