Daikin SiBE041010 - Defrost Control

Control Specification SiBE041010
34 Function and Control
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 a certain value to finish.
Detail Conditions for Starting Defrost

The starting conditions is determined with the outdoor temperature and the outdoor heat
exchanger temperature.

The system is in heating operation.

The compressor operates for 6 minutes.

More than 28 minutes of accumulated time pass since the start of the operation, or ending
the previous defrosting.
Conditions for Canceling Defrost
The judgment is made with outdoor heat exchanger temperature. (4°C - 22°C)
(Hz) (Hz) (seconds)
20/25 class 68 80 100
35 class 72 84 70
Frequency
Compressor
Four way valve
Fan
ON
OFF
ON
OFF
ON
OFF
0 Hz
Hz
Hz
5 sec.
430 pulse
400 pulse
450 pulse450 pulse
Initial opening
PI control
5 sec.
sec.80 sec. 630 sec.
60 sec.
(R11947)
Electronic expansion
valve opening