Defrost Control - Daikin FTXN25KEV1B 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
Conditions for Canceling Defrost
The judgment is made with outdoor heat exchanger temperature. (4 ~ 22°C)
A (Hz)
B (Hz)
C (Hz)
D (seconds)
E (seconds)
F (seconds)
G (seconds)
H (pulse)
J (pulse)
K (pulse)
L (pulse)
30
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 28 minutes of accumulated time have passed since the start of the operation, or
ending the previous defrosting.
Frequency
ON
Compressor
OFF
ON
Four way valve
OFF
ON
Fan
OFF
Electronic expansion
valve opening
25 class
68
80
B Hz
A Hz
0Hz
E sec.
D sec. F sec.
5 sec.
H pulse
K pulse
J pulse
35 class
72
84
88
40
60
510
40
470
390
430
470
SiBE041102_A
C Hz
G sec.
5 sec.
L pulse
Initial opening
Function and Control
PI control
(R14569)