Defrost Control - Daikin FTXG-J Service Manual

SiBE041012_B

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
Conditions for Canceling Defrost
The judgment is made with the outdoor heat exchanger temperature. (B°C)
A (minutes)
B (°C)
C (Hz)
D (Hz)
E (seconds)
F (seconds)
G (seconds)
H (seconds)
J (seconds)
K (pulse)
Function and Control
The starting conditions are 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 A minutes of accumulated time pass after the start of the operation, or ending the
previous defrosting.
Frequency
ON
Compressor
OFF
ON
Four way valve
OFF
ON
Fan
OFF
Outdoor electronic
expansion valve opening
25/35 class
28
4 ~18
76
86
50
60
480
60
5
350
C Hz
0 Hz
F sec.
E sec. G sec.
5 sec.
450 pulse
K pulse
RXG50K2V1B RXG50K3V1B
44
4 ~12 4 ~12
55
90
60
120
340
50
15
450
Control Specification
D Hz
0 Hz
H sec.
J sec.
450 pulse
Initial opening
44
55
90
60
120
340
50
5
450
PI control
(R18274)
53