90
Heating/cooling circuits
A heating or cooling circuit is a sealed unvented circuit
between the heat pump and the consumers (e.g. radia-
tors), in which the heating water or coolant circulates.
A separate cooling circuit is a separate sealed unven-
ted circuit that supplies a cooling appliance, such as a
fan convector or a chilled ceiling. Cooling via a sepa-
rate cooling circuit is independent of the outside tem-
perature.
Heating and cooling of the entire interior can, if
required, be split over several heating circuits and one
cooling circuit.
Up to 3 heating circuits are possible ("Heating cir-
cuit 1", "Heating circuit 2", "Heating circuit 3"), e.g.
one heating circuit for the rooms occupied by yourself
and one heating circuit for the rooms of a separate flat.
Only one cooling circuit is possible:
■
Heating/cooling circuit
Cooling operation via a heating circuit ("Heating cir-
cuit 1", "Heating circuit 2", "Heating circuit 3"),
e.g. a room with underfloor heating. This room can
be cooled in summer and heated in winter.
Cooling via the heating circuit only takes place when
the outside temperature has exceeded the cooling
limit. Heating via the heating circuit only takes place
when the outside temperature has fallen below the
heating limit. The cooling limit and the heating limit is
set by your qualified contractor.
or
■
Separate cooling circuit
The separate cooling circuit ("Cooling circuit SKK")
can be connected to the heat pump control unit in
addition to the max. 3 heating circuits.
A separate cooling circuit cannot be used to provide
heating.
In these operating instructions, the heating circuits, the
heating/cooling circuit and the separate cooling circuit
are generally referred to as the heating/cooling cir-
cuits. A differentiation between the heating circuit,
heating/cooling circuit and separate cooling circuit is
only made in individual cases.
Example:
■
"Heating circuit 1" is the heating circuit for the
rooms occupied by you.
■
"Heating circuit 2" is the heating circuit for the
rooms of a separate apartment.
■
"Cooling circuit SKK" is a separate cooling circuit
with fan convector for a storage room.
The heating/cooling circuits are designated at the fac-
tory as "Heating circuit 1", "Heating circuit 2",
"Heating circuit 3", "Cooling circuit SKK".
If you or your qualified contractor have renamed the
heating/cooling circuits, e.g. as "Apartment", that des-
ignation will be displayed instead of "Heating cir-
cuit..."/"Cooling circuit SKK".
Heating circuit pump
Circulation pump for the circulation of the heating
water in the heating/cooling circuit.
Instantaneous heating water heater
See "Electric booster heater".
Heating water buffer cylinder
A heating water buffer cylinder stores a large amount
of thermal energy for central heating. This safeguards
the heat supply for all connected heating circuits even
when the appliance is not operational for several
hours, e.g. during a power-OFF period.
You can heat up the heating water buffer cylinder over-
night and make use of economical night tariff power, if
applicable.
When heating the heating water buffer cylinder, the
heat pump is operational for a longer period of time.
This increases efficiency.
Appendix
Terminology (cont.)
5790940
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