Technical data

Ichill 200CX EVO rev 1.1 14/11/2013
Pag. 72 of 151
39.3 Forced Defrost
The function is enabled if the parameter dF19>0. It allows to make a forced defrost cycle even if the dF09
timeout counting is not expired, when the condensing/evaporating temperature/pressure is lower than dF20
setpoint for the dF19 time counting.
If during the dF19 time counting the condensing/evaporating temperature/pressure rises above the value
dF20+dF21 (set+differential) the function is disabled and the tF19 time is reloaded.
ATTENTION
: the forced defrost is not related to the dF09 /dF06 delay times, therefore the forced defrost cycle, if condition are OK, is
immediately executed.
39.4 Combined Defrost
The function is enabled if one of the digital input is configured as NTC temperature for combined defrost of
the 1st or 2nd circuit. This probe detects the external air temperature of the condenser (evaporator in heat
pump) and its temperature value determines the start and the stop of the defrost cycle.
Description:
The defrost count-down starts when the temperature/pressure of the probe, configured as
condensing/evaporating circuit 1 or 2 probe, is lower than dF02 parameter.
After the dF09 counting the instruments checks the temperature probe value (configured as combined
defrost circuit 1 or 2) and if it is lower than dF10 (temperature setpoint to start the defrost of the circuit 1) or
dF12 (temperature setpoint to start the defrost of the circuit 2) the defrost cycle starts, otherwise the unit still
runs in heat pump mode.
When the temperature decreases under the dF10 or dF12 values the defrost immediately start.
The defrost ends when the NTC combined defrost probe 1 or 2 increases over dF11 (circuit1) or dF13
(circuit2).
39.5 Manual Defrost
The manual defrost key function is enabled if the unit is on with at least one compressor running.
The defrost start temperature/pressure of the controlled probe must be lower than dF02 setpoint value while
if the combined defrost is active the detected temperature must be lower than dF10 or dF12.
At this point by pushing
key in the “Defrost status of the circuit” visualization, the defrost starts.
ATTENTION:
the manual defrost is not related to the dF09 /dF06 delay times, therefore the forced defrost
cycle, if condition are OK, is immediately executed for both circuits.
39.6 Defrost In Unit With Two Circuits
39.6.1 Start defrost in unit with common condenser
Parameter involved: dF22
0= Independent
1= Only if both circuit conditions are satisfied
2= At least one circuit condition is satisfied
39.6.2 End defrost in unit with two condenser
Parameter involved: dF23
0= Independent
1= Both circuits have reached the conditions to stop the defrost
2= At least one circuit has reached the end defrost condition
Common condensation: possibile configuration
Parametri dF23=0 dF23=1 dF23=2
dF22=0 not possible (ACF1) not possible (ACF1) not possible (ACF1)
dF22=1 not possible (ACF1) YES YES
dF22=2 not possible (ACF1) YES not possible (ACF1)
Separate condensation: possibile configuration