Defrost Control - Daikin CTXG09QVJUW Service Manual

Control Specification

4.11 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.
Details Conditions for Starting Defrost
Conditions for Canceling Defrost
The judgment is made with the outdoor heat exchanger temperature. (B°C (C°F))
90
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 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
Normal
opening
control
(operating room)
Electronic
expansion valve
Normal
opening (stop
control
room)
E Hz
D Hz
0 Hz
G sec.
F sec. H sec.
5 sec.
K pulse L pulse M pulse
zone zone zone
P pulse zone
SiUS121630EA
PI control
0 Hz
J sec.
5 sec.
N pulse Starting
zone control
Q pulse Starting
zone control
(R21926)
Functions and Control