1592015820 User manual IC260_261L_D DUO FW1.9 rel. 1.0
Pag. 84 of 149
Parameter
dF23=0
dF23=1
dF23=2
dF22=0
YES
not possible (ACF1)
not possible (ACF1)
dF22=1
YES
YES
YES
dF22=2
not possible (ACF1)
YES
not possible (ACF1)
ATTENTION:
The configuration error ACF1 is displayed if the parameter value of dF22 and dF23 is not permitted.
For only one condensing unit the dF22 and dF23 values must be not equal to 0.
40.7 Defrost With Condenser Fan Procedure
DEFROST WITH CONDENSER FANS
If dF01 = 4 defrost is activated only through the condenser fans.
If the temperature detected by the probe configured as external air temperature > dF26, instead of reverse
the cycle, the compressor is stopped and is activated the condenser fan.
The defrost ends:
If the combined defrost is ON, for temperature or max time
If only NTC probes are configured, for temperature or max time
If only pressure probes are configured, for max time
ATTENTION:
also if the defrost through condenser fan is activated, if the external temperature < dF26, the defrost is
through hot gas (compressor ON).
If dF17 = 2 during dripping time (dF08 if different from 0) the ventilation is forced for the time set on dF08
only if the temperature detected by the probe configured as external temperature is > of the Par. dF26 value.
ATTENTION:
With defrost with only ventilation enabled the forced defrost is always with hot gas.
40.8 Defrost Parameter Description
ATTENTION
IT IS NOT POSSIBLE TO DO MODIFY THE dF PARAMETERS WHEN THE DEROST
CYCLE IS RUNNING.
dF01
Defrost mode
0 = Defrost not enabled;
1 = Temperature/pressure defrost. The dF09 “Time delay to defrost” starts to decrease when the
temperature/pressure decreases under the dF02 setpoint.
The defrost ends when pressure/temperature reaches the end defrost temperature/pressure.
2
=
Time duration defrost. The dF09, time delay to the defrost, starts when the temperature decreases under
the dF02 setpoint (see start probe par. dF24). The defrost cycle ends after dF05 minutes.
3 = Defrost starts when the temperature/pressure decreases under the dF02 setpoint (see start probe par.
dF24) and stops when the digital input configured as “digital input to start defrost” is active. The delay dF09
“Time delay to defrost” starts when the temperature decreases under the dF02 set point. The Defrost cycle
ends when the digital input is active.
4 = Defrost with condenser fan
5= Defrost starts if the digital input configured as “digital input to start defrost” is active and ends when
pressure/temperature reaches the end defrost temperature/pressure.
dF02
Temperature / pressure to begin the time counting to next defrost.
It allows to program a setpoint under which the dF09 starts counting.
dF03
Temperature / pressure to end the defrost.
It allows to program a temperature/pressure setpoint value to determines the end of the defrost when the
probe value is rising.
dF04
Minimum duration of the defrost
It determines the minimum defrost time duration after starting the defrost itself even if the conditions are not
more satisfied.
dF05
Maximum duration of the defrost
