Set point
+1 +1 +1
-1
T inc. T inc.
T inc.
T dec.
Time
Regulator probe
Band
Set point
+1 +1 +1
-1
T inc. T inc.
T inc.
T dec.
Time
Regulator probe
Band
Digital fan preventilation (cold mode only)
If the parameter Fn10=1 (if the compressor is OFF, the fan is OFF) and Fn15<>0, the preventilation function is active.
Prior to switching on the compressor, the fans will be activated for a time equal to Fn15; the number of fans activated
is proportional to the value of the regulation probe but is not less than 1. This is to avoid the compressor switching
on when the condensation probe values are excessively high.
If, at the end the preventilation, the regulator does not request fans, the fans are switched off immediately. The
preventilation is reset if the right parameter conditions are present and if the inlet request is zeroed and then returns
(even if the inlet request is cancelled by its alarm or the outlet alarm). In the event of a regulation probe error, the
fan ON/OFF switches will be controlled on request from the compressor. During the ON phase, the number of fans
switched on in respect to the number of those present depends on the value set at parameter Fn24.
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