Mitsubishi PUHY-EP250 - General Overview on LEV Operation; Troubleshooting LEV Problems

[8-8 Troubleshooting LEV Problems ]
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HWE12050 GB
8-8 Troubleshooting LEV Problems
8-8-1 General Overview on 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)
2) Outdoor unit control board and the LEV (Outdoor unit: Linear expansion valve)
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.
Control board
Drive circuit
LEV
M
5
5
2
2
1
1
3
3
4
4
6
6
DC12V
Red
Intermediate connector
Brown
Blue
Orange
Yellow
White
Red
Orange
White
Brown
Blue
Yellow
6
5
4
4
3
2
1
3
2
1
4
3
2
1
ø4
ø3
ø2
ø1
ø4
ø3
ø2
ø1
Control board
Drive circuit
LEV
M
5
2
1
3
4
6
DC12V
Red
Blue
Orange
Yellow
White
Orange
White
Blue
Yellow
Red
6
5
4
3
2
1