Mitsubishi Electric CITY MULTI PEFY-AF1200CFM-E Technical & Service Manual page 23

[ VIII Troubleshooting ]
(4) Linear expansion valve
Disconnect the connector, and measure the resistance between terminals with a tester.
Refer to the next page for details.
CN60
(F)
1
(E)
2
(D)
3
M
(C)
4
(B)
5
LEV
(A)
6
(A) Brown
(B) Red
(C) Blue
1) Summary of linear expansion valve (LEV) operation
The LEV is operated by a stepping motor, which operates by receiving a pulse signal from the indoor control board.
The LEV position changes in response to the pulse signal.
Indoor control board and LEV connection
(J)
(C)
4
(A)
M 6
(E)
2
5
1
3
(F) (B) (D)
(A) Brown
(B) Red
(C) Blue
(D) Orange
(E) Yellow
Pulse signal output and valve operation
Phase
number
1
ø1 ON
ø2 ON
ø3 OFF
ø4 OFF
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
When the valve position remains the same, all output signals will be OFF.
If any output signal is missing or if the signal remains ON, the motor vibrates and makes clicking noise.
HWE13100
Normal
1-5 2-6
White-Red Yellow-Brown
200
(D) Orange
(E) Yellow
(F) White
(F) White
(G) Control board
(H) Connection (CN60,CN7V)
(I) Drive circuit
(J) Linear expansion valve
Output pulse
2 3
OFF OFF
ON OFF OFF
ON ON OFF
OFF ON
3-5 4-6
Orange-Red Blue-Brown
10%
(A)
(B)
(C)
(D)
(E)
(F)
(H)
4
ON
ON
- 19 -
Abnormal
Open or short
(G)
12VDC
6
5
(I)
4
3
2
1
GB