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Mitsubishi Electric PFAV-P250VM-E Service Manual page 205

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Table of Contents
[ X Troubleshooting ]
-5- LEV
LEV operation
LEV (Indoor unit: Linear expansion valve) and LEV2 (Outdoor unit: Linear expansion valve) are stepping-motor-driven valves
that operate by receiving the pulse signals from the indoor and outdoor unit control boards.
(1) Indoor LEV and Outdoor LEV (LEV2)
The valve opening changes according to the number of pulses.
1) Indoor unit control board and the LEV (Indoor unit: Linear expansion valve)
LEV
Blue
4
Brown
6
M
Yellow
2
5
1
White
Red Orange
Note. The connector numbers on the intermediate connector and the connector on the control board differ. Check the color of the lead wire
to judge the number.
2) Outdoor unit control board and the LEV (Outdoor unit: Linear expansion valve)
LEV
Blue
4
Red
6
M
Yellow
2
5
1
Orange
White
3) Pulse signal output and valve operation
Output
(phase)
number
1
1
ON
2
ON
3
OFF
4
OFF
HWE10190
Intermediate connector
4
3
2
1
ø4
ø3
ø2
ø1
Output state
2
3
4
OFF
OFF
ON
ON
OFF
OFF
ON
ON
OFF
OFF
ON
ON
- 196 -
Brown
2
Red
5
Blue
1
Orange
3
Yellow
4
6
White
Brown
Blue
Orange
Yellow
White
Output pulses change in the following orders when the
Valve is closed; 1
Valve is open;
4
*1. When the LEV opening angle does not change,
all the output phases will be off.
*2. When the output is open phase or remains ON,
the motor cannot run smoothly, and rattles and vibrates.
Control board
DC12V
6
5
Drive circuit
4
4
3
3
2
2
1
1
Control board
DC12V
6
5
Drive circuit
ø4
4
ø3
3
ø2
2
ø1
1
2
3
4
1
3
2
1
4
GB
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