1592015820 User manual IC260_261L_D DUO FW1.9 rel. 1.0
Pag. 76 of 149
ATTENTION
When the outputs are configured as heaters circuit #1 and 2 they are both controlled by the NTC probe of
the common condenser outlet.
Graph of the anti-freeze- integration heating - boiler heater relays
Boiler function
The function is enabled when:
One probe is configured as outside temperature.
Parameter Ar11 > 0.
Ar11=1 Boiler in integration mode
When outside temperature decreases under the Ar12 setpoint, the Ar14 delay starts counting. If during the
Ar14 counting the external air increases above the Ar12 + Ar13 (differential) the function is aborted and the
Ar14 time is reloaded.
When the time Ar14 is elapsed and the external air temperature is still under the Ar12 setpoint, if the water
temperature detected by the evaporator probe is lower than Ar15 in chiller mode or Ar17 in heat pump mode,
the heaters are turned on.
When the temperature rises over Ar15 + Ar16 in chiller mode or Ar17+Ar18 in heat pump the heaters are
turned off.
If the heaters are on, when the outside temperature increases over Ar12 + Ar13, they are turned off and the
Ar14 delay is reloaded.
Attention
If outside temperature falls blow Ar19 setpoint, the compressors are switched off; they can restart if the
outside temperature increase over Ar19+Ar20.
Heating control Ar11=2
When outside temperature decreases under the Ar12 setpoint, the Ar14 delay starts counting.
If during this delay the outside temperature increase over the Ar12+Ar13 the process is aborted and the time
Ar14 reloaded.
When the time Ar14 is elapsed and the external air temperature is still under the Ar12 setpoint, if the water
temperature detected by the evaporator probe is lower than Ar15 in chiller mode or Ar17 in heat pump mode,
the heaters are turned on and the compressor(s) and the condensing fan(s) are turned off. The heating is
made only by the heaters.
When outside temperature increase over Ar15+Ar16 or Ar15 + Ar17 the heaters are turned off.
If the outside temperature increase over Ar12 +Ar13, the heaters are turned off, the compressor regulation
restarts, the Ar14 delay is reloaded.
BOILER HEATERS DURING the DEFROST CYCLE
The Ar05 parameters defines the tatus of the heaters during the defrost:
Ar05=0 Heaters activated accordingb the regulation
Ar05=1 The heaters are switched on when the 4-way valve changes the status from heat pump to chiller and
switched off after the dripping time at the end of the defrost.
ATTENTION
The heaters of the boiler are always off in case of:
flow switch alarm
water pump overload alarm
