Discharge Temperature Control; Inverter Protection Control; Phase Detection; Pressure Switch - LG MULTI V M ARNU07GTU 4 Series Svc Manual

Function

3.2 Discharge temperature control

n MULTI V M control
Temperature Range
Tdis ≥ 115 ℃
Tdis ≥ 110 ℃
Tdis ≥ 108 ℃
108 ℃ > Tdis ≥ 105 ℃
105 ℃ > Tdis ≥ 100 ℃
Tdis < 100 ℃
SC : Sub Cooling, SH : Super Heating

3.3 Inverter protection control

n ARUN050LMS0
- Cooling mode
AC input Current
Compressor Current
- Heating mode
AC input Current
Compressor Current

3.4 Phase detection

n If the power lines are connected incorrectly the product will not work and displays error like below.
Case 1) 1 or more phase lines are omitting (disconnected)
Case 2) Neutral (N) line connected wrongly to any phase line
Case
Missed Phase

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.
Compressor
OFF
-5Hz/10 s
-5Hz/30 s
no increase
+3Hz or less
Normal control
Normal Operation
20 and less
10 and less
Normal Operation
20 and less
11 and less
Terminal block
R S
X
X
Sub cooling EEV
Min. pulse
SC_SH decrease control
Frequency Down
20 or Over
10 or Over
Frequency Down
20 or Over
11 or Over
T
X
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Only training and service purposes.
IDU EEV
Min. pulse
SH decrease control
System stop
29
12
System stop
29
13
Error No.
N
50
05
50
X (when Fan Motor
operating)