Mitsubishi Electric HP120TNU-A Service Handbook page 266

[8-8 Troubleshooting LEV Problems ]
3) Pulse signal output and valve operation
Output
(phase)
number
1
1 ON
2 ON
3 OFF
4 OFF
4) LEV valve closing and opening operation
Valve closed
Valve open
A
E
B
80 - 100 pulses
HWE18220_GB
Output state
2 3 4
OFF OFF ON
ON OFF OFF
ON ON OFF
OFF ON ON
D
C
Fully open: 1400 pulses
Pulses
Output pulses change in the following orders when the
Valve is closed; 1 2
Valve is open; 4 3
*1. When the LEV opening angle does not change,
all the output phases will be off.
*2. When the output is open phase or remains ON,
the motor cannot run smoothly, and rattles and vibrates.
*When the power is turned on, the valve closing signal of 2200 pulses
will be output from the indoor board to LEV to fix the valve position.
It must be fixed at point A.
When the valve operates smoothly, no sound from LEV or no vibration
occurs, however, when the pulses change from E to A in the chart or
the valve is locked, a big sound occurs.
*Whether a sound is generated or not can be determined by
holding a screwdriver against it, then placing your ear against the handle.
3 4 1
2 1 4
chapter 8 -
25