Defrost Control - Daikin RXL-W Series Service Manual

SiUS092231E

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)
Part 4 Functions and Control
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 class
20 ~ 25
(°C) 2 ~ 20
(°F) 35.6 ~ 68.0
64
64
40
60
510
50
8
400
300
350
D Hz
C Hz
0 Hz
F sec.
E sec. G sec.
J sec.
K pulse L pulse zone
zone
12 class
20 ~ 25
2 ~ 20
35.6 ~ 68.0 42.8 ~ 86.0
40
40
40
60
510
50
8
400
300
350
Control Specification
0 Hz
H sec.
8 sec.
M pulse Starting
control
zone
15 class 18/24 class
44 15 ~ 25
6 ~ 12 4 ~ 12
42.8 ~ 86.0
48 48
70 54
60 60
60 120
340 340
90 60
5 8
450 450
300 ~ 450 400
200 450
PI control
(R21661)
86