Defrost Control - Daikin FTXS20G2V1B Service Manual

Control Specification

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.
„ More than
Conditions for Canceling Defrost
The judgment is made with outdoor heat exchanger temperature. (4°C ~ 18°C)
Frequency
Compressor
Four way valve
Fan
Electronic expansion
valve opening
55
exchanger temperature.
minutes of accumulated time pass since the start of the operation, or ending
the previous defrosting.
ON
OFF
ON
OFF
ON
OFF
20 class
(minutes) 28
(Hz) 76
(Hz) 86
(seconds) 50
(seconds) 60
(seconds) 600
(seconds) 50
(pulse) 450
(pulse) 350
(pulse) 450
Hz
0Hz
sec.
sec. sec.
5 sec.
pulse
pulse
25/35 class 42 class
28 30
76 48
86 70
50 60
60 120
600 650
60 30
450 450
350 350
450 450
SiENBE04-808_A
Hz
sec.
5 sec.
pulse
Initial opening
50 class
44
55
90
60
120
460
30
450
450
450
Function and Control
PI control
(R12211)