Troubleshooting Lev Problems; General Overview On Lev Operation - Mitsubishi Electric PUHY-P200 Service Handbook

[8-8 Troubleshooting LEV Problems ]

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)
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
HWE14040
Intermediate connector
Brown
2
Red
5
Blue
1
4
Orange
3
3
Yellow
2
4
White
1 6
ø4 Blue
Orange
ø3
Yellow
ø2
ø1
White
- 258 -
Control board
DC12V
6
5
4
3
2
1
Control board
DC12V
6
Red
5
4
3
2
1
Drive circuit
4
3
2
1
Drive circuit
ø4
ø3
ø2
ø1
GB