3
* Fan control options.
The ALFANET 85 has various settings for the evaporator fan. Normally the fan runs continuously,
except if one the the parameters mentioned below is set to 1.
Parameter 20 = 1
Fan switch differential active
The fan only runs if the temperature of the defrost sensor is lower than the temperature of the
control sensor minus the fan switch differential (P 21)
Parameter 24 = 1
Fan off during defrost.
To prevent that after the defrost and drip-off time the fan starts to run and warm air is blown
into the cold room, two conditions can be set:
a. The fan is blocked until the defrost sensor reaches a temperature lower than the
temperature set with parameter 25.
b. The fan is blocked until the defrost delay of parameter 26 has passed, unless the defrost
sensor reaches the switch-on temperature of parameter 25. If the defrost sensor is broken,
the ALFANET 85 will run he time of parameter 26 before the fan is started.
Parameter 22 = 1
Fan off if cooling off.
The fan is stopped if the cooling is stopped. This is done through the delay of parameter 23.
* Defrost control options.
The automatic defrost is started by the defrost interval time and stooped after the maximum
defrost time or sooner is the defrost sensor reaches the set end-of-defrost temperature. The
ALFANET 85 has various automatic defrost options that can be set with the following parameters.
Parameter 34 = 0
Defrost with fixed defrost intervals.
Hereby parameter 30 is always the selected interval time.
Parameter 34 = 1
Defrost based on the total cooling run time.
Hereby the defrost is started if the cooling has run the time set with parameter 30.
Parameter 38 = 1
The ALFANET 85 start with defrost when switched on.
The ALFANET 85 starts with a defrost cycle if the ALFANET 85 is switched on, whereby first
the defrost-swtich-on-delay (parameter 39) is passed. During this delay the cooling can be on,
after which the defrost is started.
Parameter 33 = 1
For hot-gas-defrost systems the cooling is switched on during defrost.
After the defrost the drip-off time (parameter 37) is started. During this time the defrost relay is
not active and the evaporator can drip off. During this time the cooling will not run.
Summary of Contents for ALFANET 85
Page 6: ...6 Connections...
Page 7: ...7 Dimensions...
