Defrost Control - Daikin 2MXS40H2V1B Service Manual

Control Specification

4.10 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 target heat exchanger temperature as the canceling condition is selected in the range of
E°C according to the outdoor temperature.
99
The starting conditions is 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 30 minutes of accumulated time pass since the start of the operation, or ending
the previous defrosting.
Frequency
60 sec.
ON
Compressor
OFF
ON
Four way valve
OFF
ON
Fan
OFF
450 pulse
Outdoor electronic
expansion valve opening
(operating room)
Outdoor electronic
140 pulse
expansion valve opening
(stop room)
40 class
(Hz)
A 70
(Hz)
B
86
(pulse)
C
350
D (pulse)
160
E
(˚C)
4 ~ 12
B
A
Hz
0 Hz
120 sec.
530 sec.
5 sec.
C
pulse
pulse
D
50 class
48
64
300
200
4 ~ 15
SiBE121123_A
Hz
0 Hz
30 sec.
5 sec.
450 pulse
Initial opening
Initial opening
0 pulse
Function and Control
PI control
(R18387)