7
3.4.3 Frost protection for the cross-countercurrent heat
exchanger
A heat exchanger in the path of the outdoor air flow preheats
the outdoor air, and thus prevents the cross-countercurrent heat
exchanger from freezing up.
3.4.4 Buffer mode for air heating
If a heating system with a low draw-off rate and little thermal
capacity is used, e.g. air heating coil through which the domestic
ventilation flow is routed, the lower section of the DHW cylinder
can be utilised as a buffer cylinder. Excess heat can be temporarily
stored there, thereby reducing compressor cycling. This function
can be activated in the „DHW“ menu using the „DHW BUFFER
MODE“ (P84) parameter.
You can determine the operating mode by positioning the cylinder
temperature sensor.
1
2
D0000075608
1 Cylinder temperature sensor - upper position
2 Cylinder temperature sensor - lower position
If the cylinder temperature sensor is in the upper position, approx.
100l water are always maintained at the required DHW tempera-
ture. The remaining cylinder capacity is used as a heating water
buffer and have a temperature corresponding to the heating flow
temperature.
If the cylinder temperature sensor is in the lower position, the
entire cylinder content is always maintained at the required DHW
temperature.
4. Preparation
4.1 Installation site
To be able to open the front door freely, maintain a minimum clea-
rance on the r.h. side and in front of the appliance. The required
room height depends on whether the reversing hood is used or
whether the hoses are connected directly (see chapter „Installation
site/ Minimum clearances“). Maintain a minimum clearance on
the r.h. side of the appliance for service work.
Never install the appliance in wet rooms.
The room in which the appliance is to be installed must meet the
following conditions:
- The room must be free from the risk of frost.
- The floor must have sufficient load bearing capacity. In ad-
dition to the appliance weight, also take that of the cylinder
content into account.
- The substrate must be horizontal, level, solid and permanent.
- When installing the appliance inside a boiler room ensure
that the boiler operation is not impaired.
- The quantity of refrigerant makes it necessary to observe the
minimum volume of the installation room (see chapter „Spe-
cification/ Data table“).
!
Material losses
The installation room floor must be water resistant. Du-
ring appliance operation, the outdoor air releases up to
50l of condensate per day. In the case of deficient or
inadequate maintenance, water may escape. We recom-
mend installing a drain in the floor of the installation
room.
4.1.1 Minimum clearances
Outdoor/exhaust air connection with diverter hood
≥2200
1980
≥500
≥100
≥650
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