Troubleshooting Lev Problems; General Overview On Lev Operation - Mitsubishi Electric PUHY-HP200YNW-A Service Handbook

[8-8 Troubleshooting LEV Problems ]

8-8 Troubleshooting LEV Problems
8-8-1

General Overview on LEV Operation

LEV (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
White Orange
BS_08_M
Intermediate connector
Brown
2
Red
5
Blue
4 1
Orange
3
3
Yellow
2
4
6 White
1
Red
ø4 Blue
Orange
ø3
ø2 Yellow
ø1
White
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
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