Electronic Expansion Valve - LG MULTI V Service Manual

Checking Method for Key Components

2.3 Electronic Expansion Valve

• Pulse signal output value and valve operation
Output(ø) No.
ø1
ø2
ø3
ø4
• Output pulse sequence
- In valve close state: 4 ' 3 ' 2 ' 1 ' 4
- In valve open state: 1 ' 2 ' 3 ' 4 ' 1
* 1. If EEV open angle does not change, all of output phase will be OFF
2. If output phase is different or continuously in the ON state, motor will not operate smoothly and start
vibrating.
• EEV valve operation
Valve
close
open
Angle
Brown
Red
Blue
Orange
Yellow
White
Output state
1
ON ON
ON ON
OFF OFF
OFF OFF
Full open
open
1950 pulses
pulse
White
ø1
Red
ø3
Orange
Yellow Brown Blue
2 3
OFF
ON
ON
OFF
- At power ON, open angle signal of 1400 pulses out-
put and valve position is set to ⓐ
If valve operates smoothly, no noise and vibration
occurs and if valve is closed. noise occurs.
- Noise from EEV can be confirmed by touching the
EEV surface with a screw driver and listening the
EEV noise.
- If liquid refrigerant is in EEV, the noise is lower.
- 92 -
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All rights reserved. Only training and service purposes.
M
ø2 ø4
4
ON
OFF
OFF
ON