Due to our policy of continuous product innovation, some specications may change without notication.
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MULTI V IV Outdoor Unit 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.
Component Start During Defrost Control Operation Stop
Inverter Compressor 30Hz Set Value 40Hz
Fan Stop High Pressure control Normal Control
Main EEV Normal Control Maximum Pulse Normal Control
Subcooling EEV Normal Control Minimum Pulse Normal Control
Four-Way Valve On to Off Off On
Table 6: Outdoor Unit Defrost Control.
Table 7: Indoor Unit Defrost Control.
Component Start During Defrost Control Operation Stop
Fan Off Off Off
Thermo On Unit EEV Normal Control 400~800 Pulse Normal Control
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.
Component Start During Defrost Control Operation Stop
Inverter Compressor Normal Control Set Value Normal Control
Fan Normal Control Low Pressure control Normal Control
Main EEV Normal Control Normal Control Normal Control
Subcooling EEV Normal Control Normal Control Normal Control
Four-Way Valve On On On
Component Start During Defrost Control Operation Stop
Fan ON (Setting) ON (Low) ON (Setting)
Thermo On Unit EEV Normal Control Normal Control Normal Control
Table 8: Outdoor Unit Partial Defrost Control.
Table 9: Indoor Unit Partial Defrost Control.
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.
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