Technical data

www.dimplex.de 01.2012 | Project planning manual for heat pumps for heating and domestic hot water preparation | 25
Air-to-water heat pumps 2.3.7
A clearance of approx. 2 cm should be left between the heat
pump and the duct to simplify future disassembly of the heat
pump. The seal to the heat pump takes place with a sealing collar
available as an accessory ( see Fig. 2.13 on page 25).
Butt joint between two duct sections:
The duct sections are equipped with a metal frame to facilitate
connection.
The components are sealed off from one another by gluing
standard foam rubber or by applying silicone compound between
the metal frames.
Cutting lengths:
Pre-assembled air ducts can be shortened or adapted on site
using the conversion kit available as an accessory. This process-
ing set does not apply for air duct construction sets. They can be
shortened or adapted before the actual bonding. The resulting
cut edges are coated with a suitable adhesive paste (i.e. silicone)
and the ends are then fitted with zinc-plated channel sections.
Sealing collar
The sealing collar is used to seal the glass fibre reinforced light-
weight concrete air ducts on the heat pump. The air ducts them-
selves are not screwed directly onto the heat pump. When the
system is installed ready for operation, only the rubber seal
comes into direct contact with the heat pump. This guarantees
easy assembly and disassembly of the heat pump and also en-
sures that solid-borne noise is well insulated.
Fig. 2.13: Sealing collar for air ducts
2.3.7 Dimensioning the air circuit with lighweight cement based fibre glass air ducts
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
free compression value listed in the device information (see "De-
vice information manual"). Both cross sectional areas which are
too small and deflections (e.g. rain guards) which are too ex-
treme can cause impermissibly high pressure drops and lead to
ineffective or faulty operation.
Table 2.6:Reference values for the air circuit system
accessories
NOTE
The air circuit within the building should have a maximum of two 90° de-
flections to ensure compliance with the maximum permissible pressure
drops.
The air circuit components available as special accessories are
designed in such a way that their values are below the permissi-
ble compressions for the standard installation set-ups shown
(see Chapt. 2.3.7.1 on page 26). This means that it is not nec-
essary 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.
ATTENTION!
The minimum air flow should be checked whenever the set-up deviates
from the standard connections or third-party air circuit components are
fitted.
Selection of air circuit components
The following air circuit components are available in four different
sizes to correspond to the available performance levels:
 Rain guard
 Air duct (duct/bend)
 Sealing collars
Table 2.7: Allocation of air circuit components
Fig. 2.14: Components for construction kit LKL ..A
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
Unit type
Air circuit
components
Comment
LIK 8ME / LIK 8TES / LI 9TES Type 500
LI 11ME / LI 11TES Type 600
LIKI 14TE / LI 15TE Type 600 Air outlet
LI 9TU / LI 12TU Type 600 Air outlet
LI 16TES / LI 20TE Type 700
LI 24TE / LI 28TE / LIH 26TE Type 800
LIKI 14TE / LI 15TE Type 800 Air intake
LI 9TU / LI 12TU Type 800 Air intake
LI 40AS Type 900