Defrost Control - Daikin FTX20K(2)V1B Service Manual

Control Specification

3.10 Defrost Control

Defrosting is carried out by the cooling cycle (reverse cycle). The defrosting time or outdoor
Outline
heat exchanger temperature must be more than a certain value to finish defrosting.
Detail Conditions for Starting Defrost
 The starting conditions are determined with the outdoor temperature and the outdoor heat
 The system is in heating operation.
 The compressor operates for 6 minutes.
 More than A minutes of accumulated time have passed since the start of the operation, or
Conditions for Canceling Defrost
The judgment is made with the outdoor heat exchanger temperature. (B°C)
.
A (minute)
B (°C)
C (Hz)
D (Hz)
E (seconds)
F (seconds)
G (seconds)
H (seconds)
J (seconds)
K (pulse)
L (pulse)
M (pulse)

35
exchanger temperature.
ending the previous defrosting.
Frequency
ON
Compressor
OFF
ON
Four way valve
OFF
ON
Fan
OFF
Electronic
expansion valve
opening Normal
control
20/25 class
28
4-22
74
74
80
60
630
100
5
450
280-380
450
: The same value continues.
C Hz
0 Hz
F sec.
E sec. G sec.
5 sec.
K pulse
L pulse zone
zone
35 class
28
4-22
74
74
80
60
630
70
5
450
280-380
450
D Hz
0 Hz
H sec.
J sec.
M pulse Starting
zone control
50 class
25
6-30
48
42
60
60
460
60
8
450
300-450
200
Functions and Control
SiBE041525F
PI control
(R23076)
60/71 class
25
6-30
48
42
60
60
460
90
8
450
300-450
200