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Heat Exchanger Operation
Heating Boiler
Heat exchanger operation is used if you, for example, only
want to heat water via an external heating boiler in the
winter (an oil burner, for example). Set the Combi unit to
the lowest acceptable water temperature, and it will then
function as an emergency back-up. Afterwards, it will be
the thermostat of the oil burner that will determine the
heating of the water.
This mode of operation requires the installation of an extra
sensor in the tank for controlling the boiler. The maximum
water temperature must be limited to 65 °C. The tempera-
ture can be exceeded for short periods of time, for exam-
ple, in connection with disinfection.
If the boiler is to function as an extra heat source for the
unit, the temperature of the thermostat of the boiler
should be set about 5 °C lower than the thermostat of the
unit itself. This will ensure that the boiler is only operating
when water consumption cannot be covered by the unit.
When the unit is put into operation, it is necessary to
ensure that sensor values are set as desired.
Wood burner or solar collector
This optional operational connection can be used if the
function of the unit is to be supported by a wood burner or
a solar collector installation.
Sensor T9 (see the diagram on the next page) measures the
temperature in the wood burner or the solar collector. If the
temperature is higher than the water temperature in the
tank, it is possible for the control unit to activate a circula-
tion pump which will circulate water through the coil in the
tank, thereby heating the water. Hysteresis can be set up at
0-5 °C. Maximum temperature is 60 °C. Above this tempe-
rature, the control unit will disengage the pump in order to
protect the tank.
Energy-Saving Tips
Do not set the water temperature higher than necessary.
The lower the temperature, the higher the efficiency of the
unit. Only use high temperatures when necessary
Fan Operation Tips
Do not ventilate more than necessary. Over-ventilation
often results in very low humidity inside the dwelling, which
causes discomfort. In addition, it is a waste of energy to
over-ventilate. However, always make sure that there is
compliance with the required minimum atmospheric
volume.
Rechecking
After installation, we recommend that you check that
all connections are water and airtight and that condensed
water will flow off without a hindrance.
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