47
Packaged and Split Rooftop Ventilator
© 2021 Mitsubishi Electric US, Inc.
Premi
Sys
LEV
The valve opening changes according to the number of pulses.
1- AHU controller board and LEV Connection.
4
3
6
5
2
1
(G)
(H)
(I)
(J)
(A)
(A)
(B)
(B)
(C)
(C)
(D)
(D)
(E)
(E)
(F)
(F)
12VDC
M
4
6
2
3
5
1
(A)
Brown
(F) White
(B)
Red
(G) Control board
(C)
Blue
(H) Connection (CN60, CNLE V2)
(D)
Orange
(I) Drive circuit
(E)
Yellow
(J) Linear expansion valve
2- Pulse Signal Output and Valve Operation
Output (phase)
number
Output State
1
2
3
4
ø1
ON
OFF
OFF
ON
ø2
ON
ON
OFF
OFF
ø3
OFF
ON
ON
OFF
ø4
OFF
OFF
ON
ON
Output pulses change in the following orders when the
Valve is closed: 1 →2 →3 →4 →1
Valve is open: 4 →3 →2 →1 →4
*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 rattle and vibrates.
3- LEV Valve Closing and Opening Operations
Va
lve opening (refrigerant flow rate)
Valve closed
Valve open
E
B
80 - 100 pulses
Pulses
Fully open: 1400 pulses
A
C
D
* When the power is turned on, the valve closing signal
of 2200 pulses will be output from the inboard 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 of 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.
Troubleshooting – Split DX Refrigeration Circuit
