4
* Compressor control.
The compressor relay activates when the product sensor measures a higher temperature than the
se switching differential (parameter 1), and deactivates when the temperature descents below
setpoint.
There are 4 different modes off delay on the compressor possible with parameter 05 as shown below;
Parameter 05 = 0 :
The compressor relay has a start-up delay of "parameter 6" seconds.
Parameter 05 = 1:
The compressor relay has a start-up delay of "parameter 6" minutes.
Parameter 05 = 2 :
After switching off the compressor waits at least "parameter 6" minutes before switching on
again.
Parameter 05 = 3 :
In between the switching-on points the compressor waits at least "parameter 6" minutes.
Next options for Compressor control are available.
Parameter 15 :
A compressor on delay after power failure of "parameter 15" minutes.
Parameter 23 =1:
The compressor relay activates at product sensor failure.
* Fan control.
The
ALFA(NET)-45
has several parameters for fan control. Normally the fan is always active, accept
for one of the following parameters is set to 1, the fan can be stopped.
Parameter 19 = 1 (Fan switch differential active):
The fan is only active when the defrost temperature is "parameter 13"
C lower then the
measurement of the product temperature. As there are no further conditions to switch the fan
off. (e.g. Parameter 13 = 2
C and the product sensor measures 10
C, than the fan is only active
as the defrost sensor measures 10
-2
=8
C or less.)
Parameter 20 = 1 (Fan off on defrost cycle):
The fan is switched off during defrost and to prevent blowing in hot air in the cabin after defrost
and the dripping-off time, there are two conditions which can be set;
1: The fan is blocked until the defrost sensor measures a temperature lower than the
temperature setting of parameter 10.
2: The fan is blocked until the defrost-delay-time of parameter 11 has stopped. Unless the
defrost sensor has reached the temperature setting of parameter 10. When the defrost
sensor is broken (Failure E2) the
ALFA(NET)-45
runs down the entire time of parameter 11.
Parameter 22 = 1 (Compressor off -> Fan off):
The fan deactivates as the compressor deactivates, with a delay of "parameter 17" minutes.
Provided that there are no other conditions to deactivates the fan.
