IC100C Series PRELIMINARY
1592015000 Manual IC100C Series 28/05/03 Page 11 di 38
23. HOT START FUNCTION
Available only if the parameter CF01=1 air/air unit
configured as heat pump, it allows to start the supply air fan
only if the temperature of the condenser side is enough hot.
This avoid to push cold air flow into the ambient.
23.1 Hot Start Fan Graphic Function
FA25 Set point of the Hot Start
Set the temperature value, detected by the Pb2 probe,
under which the fan is keep locked.
FA26 Differential of the Hot Start
Set the differential to regulate the fan ON/OFF.
24. AUTOMATIC CHANGE - OVER
It automatic changes the chiller <-> heat pump functioning
of the unit in correlation with the external temperature
condition.
The changing occurs only when the following condition are
satisfied, otherwise the unit turns to stand-by:
1. CF01=1,3,5,7 (Heat Pump selected).
2. CF28=2 and CF07=3 (Pb4 external air temperature).
3. Pb4 probe is not faulty.
The Change Over function is regulated by parameters:
CF29 is the set point and it represents the Pb4 value under
which the controller turns to Heat Pump mode.
CF30 represents the temperature differential to turns to
Chiller mode.
The user can find helpful information by pushing and
releasing
n key so as the upper display shows the Pb4
value while the lower display shows Et label.
24.1 Graph Regulation of the Change-Over
When the temperature value is within the CF30 range, the
changeover is allowed only though keyboard.
25. DEFROST FUNCTION
The defrost cycle is enabled only if the following condition
are satisfied:
1. CF01=1,3,7 configuration chiller unit with heat pump.
2. dF01=1 defrost cycle enabled.
3. CF20=0 relay n°4 configured as reversing valve.
4. The unit is working in heat pump mode.
5. Pb3 or Pb4 must be configured as control
condensing probe without active faulty probe alarms.
If only one of these conditions is not satisfied the defrost
does not operate.
25.1 Forced Defrost
This function is enabled only if dF05 <> 0 and allows to
operate a defrost even during the counting of the time delay
dF10 and if the temperature/pressure value lower than the
parameter dF19 value for the dF05 time value.
If during the time delay dF05 the temperature/pressure
becomes higher than the parameters dF1+dF20
(differential) value then the whole procedure is stopped and
the time delay dF05 will be reloaded.
25.2 Combined Defrost
This function is enabled only if CF07 = 5 and with Pb4
configured as NTC probe therefore it is used for external
temperature on the evaporator coil during the heat pump
mode. The detected temperature allows to calculate a
better defrost cycle giving the start and the end commands
for the cycle itself. Functioning:
The Pb3 probe gives the input signal, to start the time delay
counting, when its value is lower than dF03 parameter.
After the delay dF10 the controller check Pb4 value: if lower
than dF11 the defrost procedure starts otherwise the unit
still works in Heat Pump. Just after the temperature
decreases under dF11 the defrost is enabled. The
combined defrost stops just when Pb4 probe value reaches
the end defrost temperature in dF12. If the combined
defrost is enabled is possible through key, to see the
external temperature showed on the upper display for 30
seconds while the lower display shows dEF label.
25.3 Manual Defrost
The unit is working with 1 or 2 compressor running.
The start defrost temperature/pressure value must be lower
than dF03.
If the “combined defrost” is enabled, Pb4 value must be
lower than dF11.
If the above conditions are satisfied, by pushing SET + o
for more than 5s the defrost cycle immediately starts.
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