Mitsubishi Electric PUHY-P200 Service Handbook page 141

(2) Outdoor LEV
The valve opening angle changes in proportion to the number of pulses.
(Connections between the outdoor unit's MAIN board and LEV1.)
LEV
4
6
M
2
5
1
3
Pulse signal output and valve operation
Output
(Phase)
1 2
φ 1
ON OFF
φ 2
ON ON
φ 3
OFF OFF
φ 4
OFF OFF
Output pulses change in the following orders when the
1 → 2 → 3 → 4 → 5 → 6 → 7 → 8 → 1
Valve is closed;
8 → 7 → 6 → 5 → 4 → 3 → 2 → 1 → 8
Valve is open;
❉ 1. When the LEV opening angle does not change, all the output phases are off.
2. When the output is out of phase or remains ON continuously, the motor cannot run smoothly, but move jerkily and
vibrates.
LEV valve closing and valve opening operation
Valve
closing
A
Pulse count
φ 6
φ 5
φ 4
φ 3
φ 2
φ 1
Outdoor main board connectors:
(CNLV1)
Output states
3 4 5
OFF OFF OFF
ON OFF OFF
ON ON ON
OFF OFF ON
B
Valve
opening
Fully open
480 pulses
- 139 -
Red
Brown
Blue
Orange
Yellow
White
6 7 8
OFF ON ON
OFF OFF OFF
OFF OFF OFF
ON ON OFF
❉ When the power is switched ON, a 520 pulse valve
opening signal is output to make sure the valve's posi-
tion, so that it is definitely at point
output for approximately 17 seconds.
❉ When the valve operates smoothly, there is no sound
from the LEV and no vibration occurs, but when the
valve is locked, it emits a noise.
❉ Whether a sound is being emitted or not can be deter-
mined by holding a screwdriver, etc. against it, then
placing your ear against the handle.
❉ If there is liquid refrigerant inside the LEV, the sound
may become lower.
Outdoor MAIN board
DC12V
6
5
Drive circuit
φ 4
4
φ 3
3
φ 2
2
φ 1
1
. Pulse signal is
A