Technical data

20 | Project planning manual for heat pumps for heating and domestic hot water preparation | 01.2012 www.dimplex.de
2.2.1 Air-to-water heat pumps
2.2.1 Parallel connection of air-to-water heat pumps installed outdoors.
When parallel connecting air-to-water heat pumps set up out-
doors, a minimum distance must be maintained between the in-
dividual heat pumps. This is necessary to prevent an air short cir-
cuit between the individual heat pumps. The minimum distances
for maintenance work specified in the relevant installation in-
structions must be taken into account.
A minimum distance of 1.2 m between the individual heat pumps
must be complied with (see Fig. 2.3 on page 20).
Fig. 2.3: Parallel connection of heat pumps
2.2.2 Connection on the heating side
The domestic heating system is connected using two thermally
insulated pipes. Ready-to-use heating water connection cables
consisting of two flexible pipes (one for flow and one for return) in
one cover pipe with integrated thermal insulation (PE foam), in-
cluding ready-to-use 90° bend for quick and easy connection to
the heat pump are recommended.
The cover pipe is laid underground (frost-free) and is routed
through a wall opening into the boiler room.
NOTE
Adjust the depth of the pipe trenches to the use of the terrain! Ensure
loading capacity SWL 60 in areas subjected to stresses caused by vehi-
cles.
The power supply cables (control and main cables) are laid in
one or two separate protection tubes (e.g. basic sewer pipe, min-
imum diameter DN 70).
NOTE
The distance between the building and the heat pump has an influence on
the pressure drop and the heat loss of the connecting pipes and must be
taken into consideration when designing the circulating pump and the
thickness of the insulation. Pipe lengths of over 30m should be avoided!
The connections of the heat pump are routed out of the device in
a downward direction. Refer to the respective foundation plans in
the dimension drawings (see "Device information" manual ) for
the location of the heating pipes and the condensate drain.
NOTE
To facilitate installation when using insulated district heating lines, it is
recommended to leave these at the base frame of the heat pump and to
set up the connection to the heat pump using flexible hoses.
The hoses are fed into the building with insulation and cover
pipe. The building can be sealed using a direct feed-through
adapted to the heating water connection cable
 in a dry area
 Sealing collar against non-pressuring water (DIN 18337)
 Wall-sealing flange against pressuring water (DIN 18336)
NOTE
So that water cannot penetrate the house infeeds through brickwork,
these must be painted with a bitumen-based protective coating. The
house feed-through (flange) must additionally be stabilised with a casing
tube to seal it against pressuring water.
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