Installation manual

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Domestic Hot Water Preparation and Ventilation with Heat Pumps 6.5
6.4.3 Calculating the overall pressure drop
The overall pressure drop in the air distribution system is
determined by calculating the most unfavourable pipe run. This is
split into sections and the pressure drops of the individual
components are determined on the basis of the respective
volume flow and the pipe diameter. The overall pressure drop is
equal to the total of the pressure drops of the individual
components.
The calculated overall pressure drop must be within the
permissible external compression of the domestic ventilation
device.
Ventilation system packages
When ventilation system packages are implemented, the fresh
air and exhaust air flows are routed individually from the rooms to
the device. In contrast to standard ventilation construction
methods, no air flows can be merged together or separated. This
allows the use of standardised system packages which can be
installed individually and without difficulty. The flexible air ducts
can be laid side by side, thus saving space, and also preventing
the transmission of sound between the various rooms
(telephony).
It is unnecessary to calculate the overall pressure drop if the
entire air distribution system is implemented using the
standardised multipipe air distribution systems that are available
for every type of domestic ventilation system, and the following
points are taken into consideration.
 Short direct pipe runs
 Maximum run length 15 m
 Pipes which are delivered in a compressed condition should
be fully stretched
 Routing should be favourable for the air flow with large
bending radii (avoid tight 90°angles!).
6.5 Compact Domestic Ventilation Unit (Exhaust Air) LWP 300W
The compact domestic ventilation unit (exhaust air) continually
draws in hot, humid air contaminated with pollutants from the
kitchen, bathroom and WC, and actively extracts the heat
required for domestic hot water preparation from the exhaust air
volume flow.
The compact unit (exhaust air) is specially designed for the
requirements of domestic ventilation and has the following
advantages in addition to the basic features of a hot water heat
pump:
 Permanent ventilation function independent of the hot water
consumption
 Air volume flow adjustable for 120, 185 or 230 m
3
) using a
wall-mounted control unit
 A heat pump unit which delivers a high COP despite a
relatively small but continuous volume flow
 Energy-efficient, direct current ventilator
 Constant electronic volume regulation to guarantee the
selected air volume flow even if the pressure drops vary
ATTENTION!
The exhaust air volume flow must be determined on the basis of the type
and expected use of the building. The most important standards and
regulations to be observed are DIN 1946 T6 and DIN 18017. These specify
the necessary volume flows which are used as a basis for planning the
system.
NOTE
The heating-up period for a 290 l hot water cylinder is approx. 6.2 hours
for an air volume flow of 230 m
3
and a set hot water temperature of 45 °C.
A lower air volume flow increases the length of the required heating-up
period.
If hot water consumption is high, domestic hot water preparation can be
assisted using the integrated heating element fitted as standard or using
a second heat generator connected via an integrated tube heat
exchanger.
2-pipe system for exhaust air/outgoing air
The compact domestic ventilation unit is equipped with one
exhaust air stub and one out-going air stub (2 x DN 160).
The exhaust air stubs are connected to the central duct system.
The exhaust air is expelled from damp, odour-contaminated
exhaust air rooms in the building in a controlled way, and is
conveyed outdoors via the out-going air stubs. The required
fresh air (outside air) is fed into the building via the decentralized
fresh air units.
The exhaust air system to be installed in the building is available
in the form of an exhaust air system package with decentralized
fresh air units in two different versions, the standard wall/ceiling
system package and the wall/floor system package. There is also
the option of integrating a standard duct system.
Exhaust air system package with fresh air units
In contrast to standard ventilation construction methods, when
implementing either the wall/ceiling or wall/floor system package,
the flexible Isoflex or Quadroflex hoses are routed individually
from the exhaust air rooms to the air manifold on the domestic
ventilation unit.
Exhaust air system package - wall/ceiling ALS D
This system package is used if the air distribution system can be
routed exclusively through the walls, ceilings (e.g. wooden joist
ceiling) or roof slopes. The flexible, thermally-insulated and
sound-insulated Isoflex DN 80 air hoses are used.
Exhaust air system package - wall/floor ALS B
This type of system package is used if the air distribution system,
e.g. of a storey, must be laid above the bare floor of the storey
above. The flexible, thermally-insulated and sound-insulated
Isoflex DN 80 air hoses are used for routing through walls and
ceilings. If the system is to be installed on the bare floor,
Quadroflex pipes (80 x 50) is used.