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

3.4 Phase detection

n Power lines are connected correctly like follow case, product do not work and display error no.
Case 1) Missed connect 1 or more phase line.
Case 2) N phase line is incorrectly connected.
Case
Missed Phase
Reversed Phase
h The error occur 2 or more unit of the series at the same time, only a small unit number will be displayed.
Example) Master and Slave2 occur error no. 50, ʻ501ʼ 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
- 27 -
Function
Error No.
N
50
5
X 25
50
5
N No error
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