HDG Compact 25, Operation Manual

Page: 25 / 188

3 Mode of operation – Functional description
25
There is a choice of five heating systems:
• None
– This is selected whenever a heating circuit is not needed. All
submenus for this heating circuit are then disabled.
• Radiators
– If this heating system is selected, the corresponding parame-
ters are loaded and a characteristic heating curve allocated.
• Underfloor heating
– If this heating system is selected, the corresponding parame-
ters are calculated for a flatter characteristic heating curve and
a lower laying temperature. With this heating system, you also
have the option of activating a screed drying program.
• Constant
– This system operates independently from the outside tempe-
rature and maintains a constant water temperature as it leaves
the boiler. This system is suitable, for example, for controlling
the heating of a swimming pool. An indoor thermostat unit
cannot be integrated with this heating system.
• Uncontrolled
– In an uncontrolled heating system, only the enable tempera-
ture and the time program are taken into account. This heating
system operates without a heating circuit mixer. If combined
with an indoor thermostat unit, the pump switches off after the
desired room temperature is reached.
S
CREED DRYING PROGRAM
If the heating system includes a newly installed floor heating system,
you can configure a drying period.
Underfloor heating
must
be set as the heating system.
After starting, the supply water temperature is adjusted to the
Mi-
nimum screed drying temp
.
The supply water temperature is increased in defined daily cycles by
the amount of the
Screed drying temp. increase
until the
Maximum screed drying temp.
is reached. At this tempera-
ture, the supply water temperature is held for the amount of the
Screed drying hold time
. Subsequently, following the prin-
ciple described above, the water supply temperature is reduced until
the
Minimum screed drying temp.
is reached.