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Only for training and service purposes
LGE Internal Use Only
3.5 Pressure switch
- Main has pressure sensing switch in series between compressor and power relay.
- The state of pressure sensing switch is normally on. It has small electric current from 220V AC. Never touch
the connecting terminal with hand nor short two wires directly.
3.4 Phase detection
■ If the power lines are connected incorrectly the product will not work and displays error like below.
Case1) 1 or more phase lines are missing (disconnected)
Case 2) Neutral (N) line connected wrongly to any phase line
Function
❈ In the case of series unit if the error occurs more than a single unit at same time then only a small unit number
will be displayed.
Example) Master and Slave2 occur error no. 50, ‘501’ display on the 7segment.
* Master: ***1, Slave1:***2, Slave2:***3, Slave3:***4
Case
Terminal block
Error No.
R S T N
Missed Phase
X
50
X
X5
X25
Reversed Phase
N
50
N
N5
N No error
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