Operating
mode
Meaning
ADD. HEATER The control system only permits the auxiliary heater to be
in operation.
HOT WATER In this mode the heat pump only produces hot water, no
heat goes to the heating system.
Caution! If the operating mode OFF or HOT WATER is to be
used for long periods during the winter, the water in the
heating system in the heating system must be drained,
otherwise there is a risk of frost damage.
5.2 Adjusting the indoor temperature
The indoor temperature is adjusted by changing the heat pump’s heat
curve, which is the control system’s tool for calculating what the supply
temperature should be for water that is sent out in the heating system.
The heat curve is a graph that compares the outdoor temperature with
the supply temperature. The colder the outdoor temperature the more
heat is supplied to the heating system. The heat curve will be adjusted
in connection with installation. It must be adapted later on, however, to
obtain a pleasant indoor temperature in any weather conditions. A cor-
rectly set heat curve reduces maintenance and saves energy.
There are two ways of adjusting the heat curve, partly in the HEAT
CURVE sub-menu, partly with the ROOM value.
Adjusting the HEAT CURVE
A typical heat curve is shown below. At an outdoor temperature of 0°C
the supply temperature should be 40°C. At outdoor temperatures colder
than 0°C, supply water hotter than 40°C is sent out to the radiators and
at outdoor temperatures greater than 0°C, supply water cooler than
40°C is sent out. When you increase the CURVE value, the heat curve will
become steeper and when you reduce it, it will become flatter.
16 – User manual VUBMA902
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