1592015820 User manual IC260_261L_D DUO FW1.9 rel. 1.0
Pag. 92 of 149
41.4.2 - Sanitary hot water operation when the unit is producing cold water
When the production of sanitary water is required (and it has priority), it is necessary to reverse the cycle as
follows:
the compressors are switched off
after the dF07/2 delay the 4-way valve status is reversed
after dF07/2 the compressors are switched on
after a delay of FS27 seconds valve 1 is switched on
after the FS10 delay the sanitary water valve 2 is switched off
The production of sanitary water stops once the set-point is reached and it will be possible to return to
produce cold water (if needed):
the compressors are switched off
the valve 2 is switched on
after the FS10 delay the sanitary water valve 1 is switched off
after a delay of FS28 seconds the sanitary water circulation pump is switched off
after a delay of dF08/2 the 4-way valve status is reversed
after a delay of dF08/2 the compressors are switched on as per normal if required by the chiller
regulator
41.5 Sanitary Hot Water Production: Valves In Gas Circuit ___ Fs01=2 (Air/Water,
Water/Water Unit)
41.5.1 Sanitary hot water operation when the unit is producing hot water
When sanitary hot water production is required (and it has priority), the sequence of operation is the
following:
the sanitary water pump is switched on
after a delay of FS27 seconds the valve 1 is activated
after a delay of FS10 seconds the sanitary water valve 2 is switched off
Sanitary hot water is produced until the FS03 set-point is reached.
Once the sanitary water set-point is reached:
sanitary water valve 2 is switched on
after a delay of FS10 seconds the sanitary water valve 1 is switched off
after a delay of FS28 seconds the sanitary water circulation pump is switched off
Condenser fans are managed normally.
The defrost takes priority over the production of sanitary water.
If the controller determines the need for a defrosting cycle during the production of sanitary water, the Ichill
stops the sanitary hot water operation to activate the defrost procedure:
all compressors and heaters are stopped
the valve 2 is activated
after the FS10 delay the sanitary valve 1 is switched off
after a delay of FS28 seconds the sanitary water pump is switched off
The defrost can now start as per the normal procedure.
At the end of the defrosting cycle:
If there is a need to produce sanitary water, the compressors and any heating elements will be switched
on. After the FS11 delay from the end of the dripping phase, sanitary water valve 1 is enabled and, after
the FS10 delay, sanitary water valve 2 is switched off.
If there is no need to produce sanitary water, the controller continues with normal heat regulation.
41.5.2 - Sanitary hot water operation when the unit is producing cold water
When the production of hot sanitary water is required, the sequence of operation is different and depend on
the status of the compressors:
a) One or more compressors are switched on for production of chilled water
If the production of sanitary hot water is required during operation in chiller mode:
