General Overview On Fcv Operation (Indoor Unit) - Mitsubishi Electric PUHY-M200YNW-A1 Service Handbook

[8-8 Troubleshooting LEV, FCV Problems ]
8-8-4

General Overview on FCV Operation (Indoor unit)

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.
(1) Indoor FCV
The FCV position changes in response to the pulse signal.
1) Indoor control board and FCV connection
Yellow
1
Limit signal
White
(Opening
2
"0" signal)
Black
3
M
6
4
Orange
(A) Yellow
(B) White
(C) Black
(D) Brown
(E) Green
(F) Blue
2) Pulse signal output and valve operation
Output (phase)
number
4
5
7
8
30
- chapter 8
(L)
Purple
5
6 Brown
7 8
Blue
Green
(G) Orange
(H) Purple
(I) Control board
(J) Connection (CN60)
(K) Drive circuit
(L) Flow control valve
Output status
1 2 3
ON ON OFF
OFF ON ON
OFF OFF ON
ON OFF OFF
(I)
(A)
8
Yellow
GND
(B)
7
White
(C)
6 Black
(D)
5
Brown
(E)
4 Green
(F)
Blue
3
(G)
2 Orange
(H) Purple
1
(J)
The output pulse changes in the following order:
When the valve closes 1 -> 2 -> 3 -> 4 -> 1
4
When the valve opens 4 -> 3 -> 2 -> 1 -> 4
OFF
OFF
ON
ON
12V
12V 12V
Microcomputer
(K)
BS_08_E