SiUS04-904 Control Specification (09/12 Class)
Function and Control 43
3.10 Defrost Control
Outline Defrosting is carried out by the cooling cycle (reverse cycle). The defrosting time or outdoor heat
exchanger temperature must be more than its fixed value when finishing.
Detail Conditions for Starting Defrost
Certain conditions must exist when starting the defrost operation. The heat exchanger must be in
heating operation, 6 minutes should elapse after the compressor is started, and more than 38
minutes of accumulated time should pass after the start of operation or ending of the last defrosting
operation.
Conditions for Canceling Defrost
The judgment must be made with heat exchanger temperature. 39.2~64.4°F (4~18 C°)
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