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Control Specification (15/18/24 Class)
SiUS04-904
56
Function and Control
4.11 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 its fixed value when finishing.
Detail
Conditions for Starting Defrost
The starting conditions must be made with the outdoor air temperature and heat exchanger
temperature. Under the conditions that the system is in heating operation, 6 minutes after the
compressor is started and more than 44 minutes of accumulated time pass since the start of the
operation or ending the defrosting.
Conditions for Canceling Defrost
The judgment must be made with heat exchanger temperature. (39°F~54°F / 3.8~12.2°C)
Frequency
Compressor
Four way valve
Fan
Electronic expansion
valve opening
ON
OFF
ON
OFF
ON
OFF
0Hz
5sec.
450pulse
450pulse
450pulse
Initial opening
PI control
5sec.
45sec.
60sec.
460 sec.
120sec.
(R4082)
Содержание FTXS09HVJU
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