Mitsubishi City Multi PURY-P400 Service Handbook page 73

(4) LEV
• Outdoor unit
The valve percentage opening changes in proportion to the number of pulses.
(Connections between the outdoor unit's MAIN board and SLEV, (PURY-P400·500YEM-A))
Pulse Signal Output and Valve Operation
Output (phase)
1 2
ø1 ON OFF OFF OFF OFF OFF ON
ø2 ON ON ON OFF OFF OFF OFF OFF
ø3 OFF OFF ON ON ON OFF OFF OFF
OFF OFF OFF OFF ON ON ON OFF
ø4
LEV Valve Closing and Valve Opening Operations
Valve Closing
A
Pulse Count
Output states
3 4 5 6 7
Valve Opening
Fully Open
480 pulses
Output pulses change in the following orders:
When the valve is Closed
8
When the valve is Open
* 1. When the LEV percentage opening does not change,
ON
all the output phases are off.
2. When the output is out of phase or stays on, the motor
cannot run smoothly, and it jerks and vibrates.
* When the power is switched on, a 520-pulse valve
opening signal is output to locate the valve's position to
ensure that it is at point A. (The pulse signal is output
for approximately 17 seconds.)
* Normal operation of the valve does not produce noise
or vibration. When the valve is locked, it produces
noise.
* Hold the tip of a screwdriver against it and the handle
against your ear, and listen for operating sounds.
* If there is liquid refrigerant inside the LEV, the sound
may become lower.
–72–
1→2→3→4→5→6→7→8→1
8→7→6→5→4→3→2→1→8