Defrost Control - Daikin FTXS09HVJU Service Manual

SiUS04-904

3.10 Defrost Control

Defrosting is carried out by the cooling cycle (reverse cycle). The defrosting time or outdoor heat
Outline
exchanger temperature must be more than its fixed value when finishing.
Detail Conditions for Starting Defrost
Certain conditions must exist when starting the defrost operation. The heat exchanger must be in
heating operation, 6 minutes should elapse after the compressor is started, and more than 38
minutes of accumulated time should pass after the start of operation or ending of the last defrosting
operation.
Conditions for Canceling Defrost
The judgment must be made with heat exchanger temperature. 39.2~64.4°F (4~18 C°)
Function and Control
Frequency
50sec.
ON
Compressor
OFF
ON
Four way valve
OFF
ON
Fan
OFF
450pulse
Electronic expansion
valve opening
0Hz
60sec.
600sec.
5sec.
350pulse
Control Specification (09/12 Class)
PI control
50sec.
5sec.
450pulse
Initial opening
(R4014)
43