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Troubleshooting Lev Problems; General Overview On Lev Operation - Mitsubishi Electric PURY-HP72 Service Handbook

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[8-8 Troubleshooting LEV Problems ]

8-8

Troubleshooting LEV Problems

8-8-1

General Overview on LEV Operation

LEV operation
LEV are stepping-motor-driven valves that operate by receiving the pulse signals from the indoor and outdoor unit control
boards.
(1) Outdoor LEV (LEV5a, LEV4), Indoor LEV and BC controller LEV
The valve opening changes according to the number of pulses.
1) Control boards and the LEV (Indoor unit LEV, and BC controller LEV1 (G type only) and LEV3)
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) Control boards and the LEV (BC controller LEV1 (Applicable only to the GA and HA types.))
LEV
Blue
4
Red
6
M
Yellow
2
5
1
White
Orange
HWE13080
Intermediate connector
Brown
2
Red
5
Blue
1
4
Orange
3
3
Yellow
2
4
White
1
6
Red
ø4
Blue
Orange
ø3
Yellow
ø2
ø1
White
- 273 -
Outdoor 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
GB

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