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Mitsubishi Electric PFAV-P250VM-E Service Manual page 206

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[ X Troubleshooting ]
4) LEV closing and opening operation
Valve closed
A
E
B
80 - 100 pulses
HWE10190
D
C
Valve open
Fully open
. 1400 pulses (indoor unit LEV) *1
. 2100 pulses (outdoor unit LEV) *1
Pulses
*Upon power on, the indoor unit circuit board sends a 2200 pulse
signal to the indoor unit LEV and a 3200 pulse signal to the outdoor
unit LEV to determine the valve position and always brings the valve to
the position as indicated by " A " in the diagram.
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.
*1 The LEV opening may become greater depending on the operation status.
- 197 -
GB
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