Defrost Control - Daikin 3MKS50E3V1B Service Manual

Control Specification

4.10 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 target heat exchanger temperature as the canceling condition is selected in the range of
4 ~ 12
116
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 38 minutes of accumulated time pass after the start of the operation, or ending
the previous defrosting.
°C according to the outdoor temperature.
Frequency
60 sec.
ON
Compressor
OFF
ON
Four way valve
OFF
ON
Fan
OFF
Outdoor electronic
expansion valve 450 pulse
opening (operating
room)
Outdoor electronic
expansion valve
opening (stop room)
40/50/52/58 class
A (Hz)
62
B (Hz)
80
B Hz
A Hz
0 Hz
120 sec.
530 sec.
5 sec.
350 pulse
160 pulse
68/75 class 80/90 class
54
82
60 sec.
5 sec.
400 pulse
Initial opening
Initial opening
0 pulse
39
62
Function and Control
SiBE121135
PI control
(R17160)