Defrost Control - Daikin K-Series Service Manual

SiBE061121.book Page 39 Monday, April 25, 2011 3:20 PM
SiBE061121

3.10 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 judgment is made with outdoor heat exchanger temperature. (J°C)
A (minutes)
B (Hz)
C (Hz)
D (seconds)
E (seconds)
F (seconds)
G (seconds)
H (pulse)
J (°C)
Function and Control
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 A minutes of accumulated time pass since the start of the operation, or ending the
previous defrosting.
Frequency
0 Hz
D sec.
ON
Compressor
OFF
ON
Four way valve
OFF
ON
Fan
OFF
450 pulse
Outdoor electronic
expansion valve opening
25/35 class
28
76
86
50
480
60
5
350
4 ~18
C Hz
B Hz
120 sec.
E sec.
5 sec.
H pulse
50 class
44
55
90
60
340
50
15
450
4 ~12
Control Specification
PI control
F sec.
G sec.
450 pulse
Initial opening
(R14620)
39