Installation manual

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Air-to-Water Heat Pumps 2.3
Assembly of a standard installation set-up:
Air ducts can be mounted as delivered if a standard installation
set-up (see Chap. 2.3.1 on p. 22) is selected.
The minimum clearances from the heat pump to the walls (see
Fig. 2.8 on p. 21) should always be observed when positioning
the air circuit.
The air ducts or bends are sealed in the wall opening with
standard polyurethane foam in accordance with the dimensions
in the drawing. The ducts are supported at regular intervals from
below or using threaded rods from the ceiling.
NOTE
For solid-borne sound insulation, the air ducts are not screwed directly
onto the heat pump.
A clearance of approx. 2cm should be left between the heat
pump and the ducting to simplify future disassembly of the heat
pump. The seal to the heat pump is made with the sealing collar
which is available as an accessory (see Fig. 2.9 on p. 21).
Butt joint between two duct sections:
The duct sections are equipped with a metal fixing frame to
facilitate connection. Using these fixing frames for connection
avoids air turbulence and the resulting pressure drops.
The components are sealed off from one another by gluing
standard foam rubber between the metal frames or by applying
silicon sealant between the metal frames.
Fig. 2.8: Minimum clearances for indoor installation of the air-to-water heat
pump
Cutting lengths:
Existing air ducts can be shortened or adapted on site using the
conversion kit available as an accessory. The resulting cut edges
are coated with a suitable adhesive paste (i.e. silicon) and the
ends are then fitted with zinc-plated channel sections.
When determining where to make the cut, it should be noted that
straight ducts are equipped with the tab required for connection
at one end only.
The duct sections can be cut with standard woodworking tools
such as e.g. a circular saw or jigsaw. Carbide or diamond-tipped
tools are recommended.
Sealing collar
The sealing collar is used to seal the glass fibre reinforced
concrete air ducts on the heat pump. The air ducts are not
screwed directly onto the heat pump. Only the rubber seal comes
into direct contact with the heat pump when the system is
installed correctly. This guarantees easy assembly and
disassembly of the heat pump and also ensures that solid-borne
sound is well insulated.
Fig. 2.9: Sealing collar for air ducts
2.3 Dimensioning the Air Circuit
It should be borne in mind when dimensioning the air circuit (air
intake and air outlet) that the maximum pressure drop (max.
compression) of the individual components must not exceed the
value listed in the device information (see Chap. 2.6 on p. 28).
Both cross sectional areas which are too small and deflections
(e.g. rain guard) which are too extreme can cause impermissibly
high pressure drops and lead to ineffective or faulty operation.
Table 2.2:Reference values for the air circuit system
accessories
NOTE
The air circuit within the building should have a maximum of two 90°
deflections to ensure compliance with the maximum permissible
pressure drops.
The air circuit components available as special accessories are
designed such that their values are below the permissible
compressions for the standard installation set-ups shown (see
Chap. 2.3.1 on p. 22). This means that it is not necessary to
check the overall pressure drop. A light well or a wall opening
with a rain guard can be used for the air intake and air outlet.
The overall pressure drop, which is the sum of the individual
pressure drops from the air intake to the air outlet, must not
exceed the value given in the device information (see Chap. 2.6
on p. 28). Grids, light wells, tight bends, air ducting and air hoses
should also be taken into consideration.
Air circuit components Pressure drop
Air duct straight 1 Pa/m
Air duct bend 7 Pa
Rain guard 5 Pa
Light well air intake 5 Pa
Light well air outlet 7-10 Pa