Daikin RXS35K2V1B, Service Manual

Page: 54 / 130

Control Specification SiBE041213E
43 Function and Control
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 defrosting.
Detail Conditions for Starting Defrost
„
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 pass after the start of the operation, or ending the
previous defrosting.
Conditions for Canceling Defrost
The judgment is made with the outdoor heat exchanger temperature. ( B °C)
: The same value continues.
35 class 42 class 50 class
A (minutes) 28 30 44
B (°C) 4 ~ 18 4 ~ 15 4 ~ 12
C (Hz) 76 48 55
D (Hz) 86 70 90
E (seconds) 50 60 60
F (seconds) 60 120 120
G (seconds) 480 530 340
H (seconds) 60 30 50
J (pulse) 450 450 450
K (pulse) 200 350 350
L (pulse) 300 400 350
M (pulse) 450 450 450
Frequency
Compressor
Four way valve
Fan
ON
OFF
ON
OFF
ON
OFF
0 Hz 0 Hz
C Hz
D Hz
5 sec.
K pulse
M pulse J pulse
Initial opening
PI control
5 sec.
H sec.
(R18152)
Electronic expansion
valve opening
E sec.
F sec.
G sec.
L pulse