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UAB KOMFOVENT we reserve the right to make changes without prior notice
C6M2-19-03
EN
3.6. Connection of external heating/cooling units
1
Additionally, you can connect the following to DOMEKT air handling units:
• Water heater.
• Water cooler.
• Direct expansion (DX) cooler/heater.
These accessories are installed in the air supply duct in the premises. All assemblies in the heating or cooling systems
must be connected by a qualified specialist.
When connecting the heater/cooler pipes, they must be supported by a box spanner – otherwise they will be damaged. If
water is used in the heater, for frost protection water temperature sensor (B5), must be installed. It is screwed into the special
hole on the return water pipe. The sensor must be thermally insulated so that the room temperature does not distort water
temperature measurements.
Fig. 10.
Connecting the water heater/cooler hoses and installing the water temperature sensor
When operating the unit with negative outdoor temperature, a water-glycol mixture must be used
as heat medium in a water heater or cooler or it is necessary to ensure a return water temperature of
at least 25 °C.
Heat exchanger coil of DX coolers/heaters are factory-filled with nitrogen gas. Before connecting heat exchanger coil to
the refrigerant system, the nitrogen gas is discharged through a valve which is then cut off and coil connections are soldered
to the pipeline.
3.7. Connection of condensate drain
In Domekt CF units with counter-flow plate recuperator, condensate is formed due to the difference between indoor and
outdoor temperature, therefore, units of this type are equipped with condensate drip pans and drainage outlets. Due to the
negative air pressure in the air handling unit, the water cannot drain out of the condensate collection tray by itself, therefore, it
is necessary to connect a siphon or a siphon with a one-way valve to the drain pipe.
Ø 15 mm
Ø 15 mm
40 mm
80 mm
80 mm
40 mm
Fig. 11.
Installation of a siphon without one-way valve
The drainage pipeline must be mounted with a slope, without any constrictions or loops, which might prevent water from
draining easily. If the drainage pipeline passes through the outdoors or unheated premises, it must be adequately insulated
or equipped with a drainage heating cable to prevent water freezing in winter. Any drainage system cannot be directly con-
nected to the wastewater system in order to prevent the transmission of odours and bacteria into the supply air. Condensate
from the drain of the air handling unit must be collected in a separate container or into the sewage grate without direct con-
tact. The condensate collection point should be easy to clean and disinfect.
1
Ordered separately.
Summary of Contents for Domekt CF 200 V
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