Phase Detection; Pressure Switch - LG Multi V Water IV ARNU07GTU 2 Series Service Manual

Function

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
Case
Missed Phase
Reversed Phase
❈ 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

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.
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Only for training and service purposes
Terminal block
R S
X
X
N
N
T
X
N
- 24 -
Error No.
N
50
5
X 25
50
5
N No error
LGE Internal Use Only