Nibe S735 - General Ventilation Connection; Ventilation Flow

General ventilation connection
• Ventilation installation must be carried out in accordance
with current norms and directives.
• Provision must be made for inspection and cleaning of
the duct.
• Make sure that there are no reductions of cross-sectional
area in the form of creases, tight bends, etc., since this
will reduce the ventilation capacity.
• The air duct system must be a minimum of air tightness
class B.
• To prevent fan noise being transferred to the ventilation
devices, install silencers in suitable locations in the duct
system.
• The extract air and outdoor air ducts are insulated using
diffusion-proof material along their entire lengths.
• Ensure that the condensation insulation is thoroughly
sealed at any joints and/or at lead-in nipples, silencers,
roof cowls, outdoor air dampers or similar.
• The extract air duct should, if possible, be routed up
through the roof.
• The extract air duct must be a maximum of 20 m long with
a maximum of six bends.
• Because the heat pump contains a flammable refrigerant,
the air ducting system must be earthed. This is done by
making a good electrical connection to the air ducts using
the enclosed earth cables (2). The cables must then be
connected to the earth pins on top of the top cover.
• A duct in a masonry chimney stack must not be used for
extract air.
NOTE
S735 occasionally has a very low extract air and
outdoor air temperature. To avoid damaging the
product and/or the building, it is therefore import-
ant that the extract and outdoor air ducts, the
damper section and the motor shelf are insulated
with diffusion-proof material along their entire
length.
TIP
If additional condensation insulation dimension
Ø 200 is installed on the outside of the existing
exhaust line between the heat pump and the inner
roof, the noise in the installation area is reduced
by 1-2 dB(A).
VENTILATION CONNECTIONS
S735 has two sizes of ventilation connection, 125 mm or 160
mm.
On delivery, the ventilation connections have the smaller
dimension; if the larger dimension is required, the insulation
rings placed in the connections must be removed.
Connect the heat pump to the duct system by installing a
nipple (not enclosed) or other ventilation component in the
ventilation connections.
EXHAUST AIR DUCT /KITCHEN FAN
Exhaust air duct (kitchen fan) must not be connected to
S735.
To prevent cooking odours from being led to the S735, the
distance between the kitchen fan and the exhaust air valve
must be observed. The distance should not be less than 1.5
m.
Always use a kitchen fan when cooking.
Ventilation flow
Connect S735 so that all the exhaust air, except kitchen
duct air (kitchen fan), passes through the evaporator (EP1)
in the heat pump.
19Chapter 4 | Pipe and ventilation connectionsNIBE S735