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Constructa CD22130 Manual

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36
Before installation
ṇ For exhaust air mode always cut out
the protective grid in the air connector.
With exhaust mode, a backwash valve
should be installed unless it is already in -
corporated in the exhaust pipe or wall box.
If a backwash valve is not included with
your appliance, your dealer can supply you
with one (see accessories).
Installation backwash valve:
Insert the backwash valve in the mounting
openings on the air connector.
If the exhaust air is being routed
through the outside wall, a telescopic
wall box should be used.
Connecting to Ø100 mm exhaustair duct
Attach the reducing adapter (enclosed or
available from specialist dealer) to the air
outlet. Attach the exhaust-air duct to the
adapter.
Connecting to Ø120 mm exhaustair duct
Attach the exhaust-air duct directly to the
air outlet.
Exhaust-air mode
The exhaust air is discharged upwards
through a ventilation shaft or directly
through the outside wall into the open.
Exhaust air must not be discharged via a
smoke or exhaust gas flue which is already
in use or via a shaft which is used for venti-
lating rooms in which fireplaces are located.
Discharge exhaust air in accordance
with official and statutory regulations
(e.g. national building regulations).
Discharge of air into smoke or exhaust air
flues which are not in use requires the con-
sent of a heating engineer.
If the extractor hood is operated in
exhaust-air mode at the same time
as a flue-type heater
(e.g. gas, oil or
solid-fuel heater, instantaneous water
heater, boiler),
ensure that there is an
adequate air supply which the heater
requires for combustion.
Safe operation is possible provided that the
partial vacuum in the room in which the
heater is installed does not exceed 4 Pa
(0.04 mbar).
This can be achieved if the combustion air
is able to flow through non-lockable open-
ings, e.g. in doors, windows and in con-
junction with an air supply/air-intake wall
box or by other technical procedures such
as reciprocal interlocking.
If the air intake is inadequate, there is a
risk of poisoning from combustion
gases, which are drawn back into the
room.
An air-intake/exhaust-air wall box by itself
is no guarantee that the limiting value will no
be exceeded.
Note: When assessing the overall require-
ment, the combined ventilation system for
the entire household must be taken into
consideration. This rule does not apply to
the use of cooking appliances, such as
hobs and gas cookers.
The extractor hood can be used without
restriction in circulating air mode – with an
activated carbon filter.
Optimum efficiency of the extractor
hood:
q Short, smooth exhaust pipe.
q As few bends as possible.
q Pipe diameter as large as possible (ideal-
ly 150 mm dia.) and wide pipe bends.
If long, rough exhaust-air pipes, many
pipe bends or smaller pipe diameters are
used, the air extraction rate will no
longer be at an optimum level and there
will be an increase in noise.
q
Round pipes
Short exhaust air pipe:
inside diameter min. 120 mm,
Longer exhaust air pipe:
inside diameter min. 150 mm.
q
Flat ducts must have an inside
cross-section equivalent
to that of
the round pipes.
There should be no sharp bends.
ø 120 mm dia. approx. 113 cm
2
ø 150 mm dia. approx. 177 cm
2
q If pipe diameters differ, insert sealing
strip.
q Ensure that there is an adequate air sup-
ply for exhaust air mode.
120
150
120
150
120
150
… 36 …


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