Defrost Control / Partial Defrost Control - LG MULTI V ARUN072BTE4 Service Manual

SPECIAL CONTROLS

Defrost Control / Partial Defrost Control

Defrost Control
Defrost Control eliminates ice that has accumulated on the heat exchanger, recovering its performance. Each component operates as shown
in the tables below during defrost.
Table 6: Outdoor Unit Defrost Control.
Component
Inverter Compressor
Fan
Main EEV
Subcooling EEV
Four-Way Valve
Table 7: Indoor Unit Defrost Control.
Component
Fan
Thermo On Unit EEV
Defrost Control Stop Operation
1. All heat exchanger pipe temperatures are above set temperatures for thirty (30) seconds.
2. Defrost Control Operation will run for >30% of the total heating time.
3. Defrost Control Operation will stop if / when compressor protection control starts (if a high discharge temperature at the compressor is
detected).
Partial Defrost
The heat exchanger in the outdoor unit(s) is divided into a top part and bottom part for partial defrost operation. Partial defrost operation
permits the system to defrost the parts of the heat exchanger separately so heating mode can operate continuously. Each component
operates as shown on the below table during partial defrost.
Table 8: Outdoor Unit Partial Defrost Control.
Component
Inverter Compressor
Fan
Main EEV
Subcooling EEV
Four-Way Valve
Table 9: Indoor Unit Partial Defrost Control.
Component
Fan
Thermo On Unit EEV
Partial Defrost Control Stop Operation
1. Partial Defrost Control Operation will run for a maximum of twelve (12) minutes.
2. Partial Defrost Control Operation will stop for the top part of the heat exchanger when the temperature rises higher than the set
temperature.
3. Partial Defrost Control Operation will stop for the bottom top part of the heat exchanger when the temperature rises above the set
temperature.
12
Start
30Hz
Stop
Normal Control
Normal Control
On to Off
Start
Off
Normal Control
Start
Normal Control
Normal Control
Normal Control
Normal Control
On
Start
ON (Setting)
Normal Control
Due to our policy of continuous product innovation, some specifications may change without notification.
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During Defrost Control Operation
Set Value
High Pressure control
Maximum Pulse
Minimum Pulse
Off
During Defrost Control Operation
Off
400~800 Pulse
During Defrost Control Operation
Set Value
Low Pressure control
Normal Control
Normal Control
On
During Defrost Control Operation
ON (Low)
Normal Control
Stop
40Hz
Normal Control
Normal Control
Normal Control
On
Stop
Off
Normal Control
Stop
Normal Control
Normal Control
Normal Control
Normal Control
On
Stop
ON (Setting)
Normal Control