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DOK4x HOIAO WxDEN · FD 9912
11
Air-to-water heat pump 6 kW
English
6 Assembly / connection
6.1 Assembly of the refrigerant line
and electric wire
The refrigerant lines and electric wires for connecting the in-
door unit with the outdoor unit must be ordered separately as
accessories.
To route the connection cables, create wall openings at a suita-
ble point. The wall opening must be protected from water pen-
etration according to the local conditions.
The wall openings should be sealed again correctly once the
routing work is complete. (For connecting the electric wire, see
cap. 6.6 on page 14, for connecting the refrigerant line, see
cap. 6.7 on page 17).
6.2 Condensate drain
Condensate that forms during operation must be drained off
frost free. To ensure proper drainage, the outdoor unit must be
mounted horizontally.
The condensate tray offers various options for the condensate
drain:
Foundation covered with gravel. The leaching should be
min. 1.5 l per kW of heat output per day, and the diameter
of the drain pipe should be at least 50 mm.
Channel into a waste water, rain water or drainage channel
If the condensate drain is installed at risk from frost, it must be
protected from freezing with a condensate drain heater, which
is available as a special accessory.
This must be connected in the outdoor unit, parallel to the noz-
zle ring heater (E4).
!!
ATTENTION!
The frost line can vary according to the climatic region. The
regulations of the countries in question must be observed.
6.3 Connection on heating side
Before connecting the heating system to the heat pump, the
heating system must be flushed to remove any impurities, resi-
due from sealants, etc. Any accumulation of deposits in the liq-
uefier may cause the heat pump to completely break down.
To enable better maintenance of the installed heating circuit
components, a purging option and shut-off option must be im-
plemented upstream and downstream of the indoor unit.
Once the heat pump has been connected to the heating sys-
tem, it must be filled, purged and pressure-tested.
When doing so, it must be ensured that all heating circuits and
isolating valves are open and that the 3-way reversing valve is in
heating operation (pos. 1 factory default). Fill the heating sys-
tem at the fill and drain cock (pos. 2) until system pressure (ap-
prox. 1.5 bar) is reached. A suitable fill hose with a pressure
gauge should be used. When doing so, check all connections
and the entire heating system for leakages. The heating system
should be purged at the highest point (pos. 3, e.g. radiator, heat
pumps connection).
After all of the air has been purged here, the indoor unit must be
purged at the valves of the electric auxiliary heating (pos. 4) and
domestic hot water heat exchanger (pos. 5) until the heating
water also exits free of bubbles here.
When the power supply is attached, the reversing valve can be
switched between heating operation and domestic hot water
operation in the operating unit (User Interface) in the installer
level under control functions for improved purging.
Finally, close the fill and drain cock, check the system pressure
and top up if necessary.
The following points must be observed when filling the system:
Untreated filling water and make-up water must be of
drinking water quality
(colourless, clear, free of sediments)
Filling water and make-up water must be filtered (max.
pore size 5 µm).
Scale formation in domestic hot water heating systems cannot
be avoided, but in systems with flow temperatures below 60 °C,
the problem can be disregarded. With high-temperature heat
pumps and in particular with bivalent systems in the higher per-
formance range (heat pump + boiler combination), flow tem-
peratures of 60 °C and more can be achieved. The following
standard values should therefore be adhered to with regard to
the filling and make-up water according to VDI 2035, sheet 1:
The total hardness values can be found in the table.
5
3
3
2
4
4
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