Electronic Expansion Valve - LG Therma V AHBW A0 Series Service Manual

1.7 Electronic Expansion Valve

EEV
M
1
• Pulse signal output value and valve operation
Output(ø) No.
ø1
ø2
ø3
ø4
• Output pulse sequence
- In valve close state: 1 ' 2 ' 3 ' 4 ' 5 ' 6 ' 7 ' 8 ' 1
- In valve open state: 8 ' 7 ' 6 ' 5 ' 4 ' 3 ' 2 ' 1 ' 8
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 vibrat-
ing.
• EEV valve operation
Valve
close
open
Angle
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Only for training and service purposes
ø5
4
ø4
6
ø3
2
3
Orange
ø2
ø1
1 2
ON OFF OFF
ON ON ON
OFF OFF ON
OFF OFF OFF
Full open
open
1350 pulses
pulse
Checking Key Components of Unit
Red 5
White 4
Yellow 3
2
Blue 1
Output state
3 4 5
OFF OFF
OFF OFF
ON ON
OFF ON
- 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
occur 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.
- 43 -
DC 12V Driving
circuit
ø4
ø3
ø2
ø1
6 7 8
OFF ON ON
OFF OFF OFF
OFF OFF OFF
ON ON OFF
LGE Internal Use Only