5
* Defrost control.
The automatic defrost is started by the defrost cycle time (P07) and stopped by the maximum defrost
time (P08) or sooner by reaching the maximum defrost temperature (P09). Further has the
ALFA(NET)-45A
additional parameters to control defrost;
Parameter 25 = 0:
Function defrost with a fixed defrost cycle time.
With parameter 7 as the chosen cycle time.
Parameter 25 = 1:
Function defrost based on total compressor running hours.
The defrost is started when the compressor has run for parameter 7 hours after the last defrost.
Parameter 26 = 1:
The temperature readout on the display is locked during defrost cycle.
Parameter 27 = 1:
After power-up the
ALFA(NET)-45A
starts with defrost after running thru the defrost delay time
of parameter 14. While running down the delay the
ALFA(NET)-45A
can cool, after this delay
the defrost is started.
Parameter 22 = 1:
On hot gas systems the compressor is switched on during defrost. After defrost the dripping-off
time of parameter 12 is started. During this time the defrost and compressor relay are
deactivated, so the condenser can drip off it’s water.
* Sensor adjustment.
The product sensor (Temp.) can be adjusted by using the Offset product sensor parameter 04.
The defrost sensor (Defr.) can be adjusted by using the Offset defrost sensor parameter 16.
For readout of the defrost sensor on the display use parameter 19.
Indicates a sensor e.g. 2
C to much, the according Sensor Offset has to de decreased with 2
C.
