Defrost Control - Daikin SiENBE07-618_C Service Manual

SiENBE07-618_C

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
„ The system is in heating operation.
„ The compressor operates for 6 minutes.
„ 44 minutes of accumulated time pass since the start of the operation, or ending of the
Conditions for Canceling Defrost
The judgment is made with outdoor heat exchanger temperature. (4°C ~ 12°C)
Function and Control
exchanger temperature.
previous defrosting.
Frequency
60 sec.
ON
Compressor
OFF
ON
Four way valve
OFF
ON
Fan
OFF
Electronic expansion
valve opening
50 class
(seconds) 30
90 Hz
55 Hz
0 Hz
120 sec.
460 sec.
5 sec.
450 pulse
60 class
50
Control Specification
PI control
sec.
5 sec.
Initial opening
(R12238)
37