Defrost Control - Daikin ATXS35EV1B7 Service Manual

Control Specification
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. (25/35 class: 4°C-22°C,
50 class: 4°C-12°C)
40
25/35 class
Frequency
ON
Compressor
OFF
ON
Four way valve
OFF
ON
Fan
OFF
450pls
Electronic expansion
valve opening
50 class
Frequency
ON
Compressor
OFF
ON
Four way valve
OFF
ON
Fan
OFF
Electronic expansion
450pps
valve opening
0Hz
60sec.
50sec. 660sec.
5sec.
350pls
2YC36 : 90Hz
55Hz
0Hz
120sec.
60sec. 340 sec.
5sec.
450pps
SiBE04-824
PI control
50sec.
5sec.
450pls
Initial opening
(R4014)
PI control
30sec.
5sec.
450pps
Initial opening
(R8341)
Function and Control