Protection Control; Pressure Protection Control - LG Multi V Water IV ARNU07GTU 2 Series Service Manual

Function

3. Protection control

3.1 Pressure protection control

3.1.1 Pressure control on cooling mode
■ High pressure control
Pressure Range
P ≥ 4000 kPa
d
3775 kPa
3578 kPa
P > 3775 kPa
d
P ≥ 3513 kPa
d
P ≥ 3480 kPa
d
P < 3480 kPa
d
■ Low pressure control
Pressure Range
Ps ≤ 98kPa, 1 minute later operation
Ps ≤ 124kPa, 1 minute before operation
❈ Frequency holding : frequency (or RPM) is not increasing ( can decrease )
3.1.2 Pressure control on heating mode
■ High pressure control
Pressure Range
P ≥ 4003 kPa
d
P > 3415 kPa
d
■ Low pressure control
Pressure Range
Ps ≤ 98 kPa
Ps ≤ 124 kPa
Ps ≤ 137 kPa
Ps ≤ 190 kPa
P ≥ 190 kPa
s
❈ Frequency holding : frequency (or RPM) is not increasing ( can decrease ).
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Only for training and service purposes
Compressor
Stop
-15Hz/10sec.
Frequency holding
+2 Hz or less/10sec.
Normal control
Compressor
Stop
-15Hz/10sec.
Compressor
Stop
-15Hz/10sec.
Compressor
Stop
-15Hz/10sec.
Frequency holding
+2 Hz or less/10sec.
Normal control
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LGE Internal Use Only