Defrost Control - Daikin FTXZ25NV1B Service Manual

Control Specification

2.10 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 defrosting.
Detail Conditions for Starting Defrost
Conditions for Cancelling Defrost
The judgement is made with the outdoor heat exchanger temperature. (6 ~ 30°C)
53
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 25 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
80 Hz
0 Hz
50 sec. 570 sec.
8 sec.
60 sec.
450 pulse
400 pulse
350 pulse
SiMT041311E
30 Hz
0 Hz
PI control
90 sec.
8 sec.
30 sec.
350 pulse
200 pulse Initial opening
Function and Control
(R19675)