Defrost Control - Daikin RX-W Series Service Manual

Control Specification

5.11 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
 The starting conditions are determined with the outdoor temperature and the outdoor heat
 The system is in heating operation.
 The compressor operates for 6 minutes.
 More than A minutes (depending on the duration of the previous defrost control) of accumulated
Conditions for Canceling Defrost
The judgment is made with the outdoor heat exchanger temperature (B).
A (minute)
B
C (Hz)
D (Hz)
E (seconds)
F (seconds)
G (seconds)
H (seconds)
J (seconds)
K (pulse)
L (pulse)
M (pulse)
90
exchanger temperature.
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
09/12 class
20 ~ 25
(°C) 2 ~ 20
(°F) 35.6 ~ 68.0
64
64
40
60
120 ~ 630
50
8
400
300
350
C Hz
0 Hz
F sec.
E sec. G sec.
J sec.
K pulse
L pulse zone
zone
15/18 class
44
6 ~ 12
42.8 ~ 53.6
48
70
60
60
120 ~ 460
60
5
450
300 ~ 450
300
D Hz
0 Hz
H sec.
8 sec.
M pulse Starting
control
zone
24 class
44
6 ~ 12
42.8 ~ 53.6
48
70
60
60
120 ~ 460
90
5
450
300 ~ 450
200
Part 4 Functions and Control
SiUS092230EA
PI control
(R21661)