Defrosting Control（Heat Pump - Delta 21CK018C24 Instruction Manual

Caution:
During the installation of the bottom plate of the wired controller, pay attention to the direction of the bottom plate.
The plate's side with two notches must be at the lower position, otherwise the panel of the wired controller cannot be
correctly installed.
Caution:
1. The communication distance between the main board and the wired controller can be as far as 20m (The standard
distance is 8m).
2.The wired controller shall not be installed in a place where there is water drop or large amount of water vapor.
4 Defrosting control（Heat pump）
The defrosting mode:
After the compressor consecutively runs for "t" minutes, it will start defrost if the sensor detects the temperature
≤"T1" for consecutive 1 minute. It will stop defrost when defrosting has run for 10 min
℃
the temperature over "T2"℃
defrosting control:
There are 8 defrosting modes corresponding to different DIP ways.
Firstly the abbreviations are defined as below:
t ------------the defrosting temp sensor starts to detect after the compressor has been operating for t minutes
accumulatively
T1----------the defrosting circuit on the main board starts to work when the defrosting temp sensor has been in T1 ℃
or under T1 ℃ for 1 minute continuously
T2---------The defrosting will stop after it goes on for 10 minutes continuously or the temp sensor detects the
ambient temperature over T2℃
T-----------outdoor ambient temperature
DIP and corresponding temperature
Fig.3.6.2
23
Fig.3.6.3
utes or the sensor detects