1592015820 User manual IC260_261L_D DUO FW1.9 rel. 1.0
Pag. 85 of 149
If dF01=2, it determines the maximum duration of the defrost and even if, for the other cases, the end
defrost condition are still to be satisfied.
dF06
defrost delay time between the 1
st
and the 2
nd
circuit.
After the interval dF09 determined by the defrost request of one of the circuits the other 2
nd
circuits must wait
also the time dF06 before defrosting.
dF07
Compressor off time before the defrost (the led of the compressor is blinking)
After the dF09 delay and before activating the defrost, the compressors are stopped for the dF07 time.
Exactly in the middle of the dF07 time the 4-way valve is activated to equalise the pressure of the unit and when dF07 is completely
expired the compressors and the defrost can start.
This procedure does not respect the compressor on delay protection therefore the compressor is
immediately turned off and then on. If dF07 = 0 the compressor is not stopped and the 4-way valve is
immediately turned.
dF08
Compressor off time after the defrost (the led of the compressor is blinking)
After the defrost cycle the compressors are stopped for the dF08 time.
Exactly in the middle of the dF07 time the 4-way valve is activated to equalise the pressure of the unit and to
drain the external exchange unit, when dF08 is completely expired the unit restart in heat pump mode.
This procedure does not respect the compressor on delay protection therefore the compressor is
immediately turned off and then on. If dF08 = 0 the compressor is not stopped and the 4-way valve is
immediately turned.
DF09
Delay time to next defrost
It starts when the condensing/evaporating temperature/pressure probe value is lower than dF02 setpoint.
This time is reloaded if the power supply fails, after a defrost cycle or from a digital input request of defrost.
The time counting is interrupted if the compressor is turned off or if the temperature/pressure is higher then
dF02.
dF10
Temperature setpoint to start a combined defrost of the circuit #1.
It allows to set a temperature value to determines the beginning of a combined defrost.
After the dF09 counting the NTC probe of the combined defrost of the circuit #1 is compared to the dF10
setpoint, if the value is lower the defrost starts otherwise the unit runs in heat pump mode and when the
temperature decreases under dF10 the defrost immediately starts.
dF11
Temperature setpoint to end a combined defrost of the circuit #1.
It allows to set a temperature value to determine the end of a combined defrost.
When the NTC probe of the combined defrost of the circuit #1 becomes higher than dF10 setpoint the defrost
cycle stops.
dF12
Temperature setpoint to start a combined defrost of the circuit #2.
It allows to set a temperature value to determine the beginning of a combined defrost.
After the dF09 counting the NTC probe of the combined defrost of the circuit #2 is compared to the dF12
setpoint, if the value is lower the defrost starts otherwise the unit runs in heat pump mode and when the
temperature decreases under dF12 the defrost immediately starts.
dF13
Temperature setpoint to end a combined defrost of the circuit #2.
It allows to set a temperature value to determine the end of a combined defrost.
When the NTC probe of the combined defrost of the circuit #2 becomes higher than dF13 setpoint the defrost cycle stops.
dF14
All the resources on during the defrost of the circuit #1
0= Not enabled
1= Enabled
dF15
All the resources on during the defrost of the circuit #2
0= Not enabled
1= Enabled
dF16
Compressor step delay time in defrost.
dF17
Condensing fan control during defrost and dripping cycle
0= Not enabled
1 = Enabled in defrost
2= Enabled in defrost and in dripping time
If dF17 = 0: During the defrost the fan control is not active.
If dF17 = 1: when the condensing temperature/pressure value increases over dF18 the fans are turned on.
the fan control is determined by the same algorithm used in chiller mode.
If dF17 = 2: during the dripping time (dF08 <>0) the fan are turned on for the time duration set in dF08 .
dF18
Pressure / temperature setpoint to force the fans on during the defrost
When the temperature/pressure rises over this value the fan are turned on at the maximum speed.
dF19
Time delay before starting a forced defrost
It determines a delay time before starting the defrost cycle
dF20
Temperature / pressure setpoint to force a defrost
