9
Subject to Technical Modifications of Combi 185 S/LS
Heat-exchanger operation
(S-model only)
1) Hot boiler
Heat exchanger operation is used if it is desired to heat
water only via an external hot boiler (an oil burning fur-
nace for example). The unit is set to the lowest acceptable
water temperature and will then function as an emergency
back-up. Thereafter, it will be the thermostat on the oil
burner which will determine the heating of the water.
In this operational mode an extra sensor is mounted in the
tank in order to control the boiler. See the section: Optional
connection of a heat-exchanger.
Maximum water temperature must be set at 65 °C.
This can be exceeded for short periods, in connection with
disinfection for example.
If the boiler must function as an extra heat source for
the unit, it is recommended that the temperature of the
thermostat of the boiler is set about 5 °C lower than the
thermostat of the unit itself.
This will secure that the boiler is only operating when wa-
ter consumption cannot be fulfilled by the unit.
When the unit is made operational, it is necessary to en-
sure that sensor values are set as desired.
2) Wood burner or solar cells
This optional operational connection can be utilized if
a wood burning furnace or a solar cell installation is to
support the function of the unit. Via sensor T9 (see the
diagram), the temperature in the wood burning furnace or
the solar cell installation is measured. If the temperature
is higher than the water temperature in the tank, it is pos-
sible for the control unit to activate an accelerator pump
which will circulate water through the spiral in the tank,
and thereby heat the water. Hysteresis can be adjusted to
0-5 °C. Maximum temperature is 70 °C. Above this level,
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.
Tips for operating the
fans
Do not ventilate more than necessary. Over-ventilation will
often result in very low humidity in the atmosphere in the
dwelling which will result in discomfort. In addition, it is a
waste of energy to over-ventilate.
However, always be aware of the required minimum at-
mospheric volume and that this is adhered to.
Re-checking
After the installation has been completed, it is recom-
mended to check once again that all connections are
water- and airtight and that condensed water will flow off
without hindrance.
For maintenance, see the instruction manual.
For trouble -shooting, see the instruction manual.
