IC200CX EVO
user manual
32
9.2 Units with a dedicated heat exchanger for domestic hot water (DWS)
The unit in this setup has two heat exchangers: a system side one, for air conditioning and heating,
and one dedicated exclusively to domestic water production.
On the system side heat exchanger, the unit can produce hot water or cold water to meet the heating
and cooling requirements according to the seasons.
On the heat exchanger dedicated to domestic hot water, the unit produces high temperature water
to be sent to a storage tank outside the machine. This tank has been selected and sized according to
the requirements of the system.
Depending on the season, the unit works with different modes: the change through the various
operating modes (within the season) is carried out automatically through the reading of the
temperature probes and the set points. Switching times and logics have been designed to ensure the
maximum efficiency and reliability of the system.
This configuration must be associated with a suitably sized boiler in which to store high temperature
water. The boiler must have a well for insertion of the domestic hot water probe, placed at the top,
through which the controller of the unit monitors the need to produce domestic hot water.
The priority is always for domestic hot water production. The heat pump normally operates on the
system to meet the comfort requirements of the system, but when the temperature of the water
inside the tank falls below a set threshold (set point
SetS
, chap. 6), the control manages domestic hot
water production:
• if the unit is operating as heat pump for heating, the 3way valve will be switched and the set
point changed;
• but if the unit is producing chilled water for air conditioning, the control switches the unit to
heat pump mode, gives it the set point for domestic hot water and diverts the 3way valve to
the appropriate position.
Once the temperature inside the domestic hot water tank has reached the set value, the unit
automatically returns to producing water for the heating and air conditioning system.
