Mitsubishi Electric CITY MULTI PQRY-P200YMF-C Service Handbook page 75

LEV for BC controller and indoor unit
1 LEV receives pulse signal from microcomputer, and operates valve with stepping motor.
2 Valve opening changes in proportion to the number of pulses.
Connection of microcomputer circuit board and LEV
Pulse signal output and valve operations
Output (phase)
No. 1
ø1 ON
ø2
ON
ø3 OFF
ø4 OFF
Closing and opening operations of valve
E
A
B
Additional tightening zone
(870 ~ 100 pulses)
Intermediate connector
(mounted on outdoor unit only)
Brown
Red
Blue
Orange
Yellow
White
Connector
In the case of indoor board : CN60
In the case of multi board : CNLV
Output states
2 3 4
OFF OFF ON
ON OFF OFF
ON ON OFF
OFF ON ON
D
C
Full opening
(2000 pulses)
Number of
pulse(SJ)
Microcomputer circuit boad
Operarion
circuit
1 Valve open : Output pulse changes in order of 1→2→3→4→1.
Valve close : Output pulse changes in order of 4→3→2→1→4.
2 All output phases are turned OFF when LEV opening does not
change.
3 In case output phase is lacking or kept "ON," motor can not rotate
smoothly, generating ticking sound and vibration.
1 When turning on power source, issue valve closing signal of 2,200
pulses, so that valve opening is located at point A.
2 When valve runs smoothly, no sound or vibration is generated from
LEV. However, big sound is observed when valve opening changes
from point E to A or valve is locked.
(Sound generation can be identified from the bundle of screwdriver
attached to the valve.)
–74–
Note:
Pay attention to colors of lead wires
because numbers of intermediate connec-
tors are different from those of circuit board
side connectors.