SiMT041509E Control Specification
Function and Control 40
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 have passed since 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.
A (minutes) 25
B (°C) 6 ~ 30
C (Hz) 55
D (Hz) 70
E (seconds) 60
F (seconds) 60
G (seconds) 460
H (seconds) 60
J (seconds) 5
K (pulse) 450
L (pulse) 400
M (pulse) 400
Frequency
Compressor
Four way valve
Fan
ON
OFF
ON
OFF
ON
OFF
0 Hz 0 Hz
C Hz
D Hz
J sec.
L pulse zone
PI control
8 sec.
H sec.
(R21208)
Electronic expansion
valve opening
E sec.
F sec.
G sec.
Normal
control
K pulse
zone
M pulse
zone
Starting
control
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