SiENBE04-507A Control Specification
Function and Control 69
3.10 Defrost Control
Outline Heat Pump Only
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
The starting conditions must be made with the outdoor air temperature and heat exchanger
temperature. Under the conditions that the system is in heating operation, 6 minutes after the
compressor is started and more than 28 minutes of accumulated time pass since the start of the
operation or ending the defrosting.
Conditions for Cancelling Defrost
The judgment must be made with heat exchanger temperature. (4°C-22°C)
(R4014)
Frequency
Compressor
Four way valve
Fan
Electronic expansion
valve opening
ON
OFF
ON
OFF
ON
OFF
350pps
450pps
450pps
5sec.
5sec.
Initial opening
PI control
50sec.50sec.
600sec.
60sec.
0Hz
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