Protection Control; Pressure Protection Control - LG Multi V ARWM072CAS5 Service Manual

3. Protection control

3.1 Pressure protection control

3.1.1 Pressure control on cooling mode
• High pressure control
Pressure Range
P ≥ 4000 kPa(580.2 psi)
d
P > 3775 kPa(547.5 psi)
d
P ≥ 3650 kPa(529.4 psi)
d
P ≥ 3480 kPa(504.7 psi)
d
P < 3480 kPa(504.7 psi)
d
• Low pressure control
Pressure Range
P ≤ 110 kPa(16 psi) 1 minute later operation
s
P ≤ 150 kPa(21.8 psi) 1 minute before operation
s
h Frequency holding : frequency (or RPM) is not increasing (can decrease)
3.1.2 Pressure control on heating mode
• High pressure control
Pressure Range
P ≥ 4000 kPa(580.2 psi)
d
P > 3415 kPa(495.3 psi)
d
• Low pressure control
Pressure Range
739 kPa(107.2 psi) < P
P ≤ 739 kPa(107.2 psi)
s
h Frequency holding : frequency (or RPM) is not increasing (can decrease).
≤ 778 kPa(112.8 psi)
s
-15Hz/10Second
Frequency holding
+2 Hz or less/10Second
Normal control
-10Hz/10Second
-15Hz/10Second
Frequency holding
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Function
Compressor
Stop
Compressor
Stop
Compressor
Stop
Compressor
-5Hz/7sec.