General Ventilation Connection; Ventilation Flow; Adjusting Ventilation - Nibe F750 Installer Manual

General ventilation
connection
• Ventilation installation must be carried out in accord-
ance with current norms and directives.
• Connections must be made via flexible hoses, which
should be installed so that they are easy to replace.
• Provision must be made for inspection and cleaning
of the duct.
• Make sure that there are no reductions of cross-sec-
tional 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 tight-
ness class B.
• To prevent fan noise being transferred to the ventila-
tion devices, install silencers in the ducts.
• The extract air duct has to be insulated using diffusion-
proof material (at least PE30 or equivalent) along its
entire length.
• Ensure that the condensation insulation is fully sealed
at any joints and/or at lead-in nipples, silencers, roof
cowls or similar.
• The extract air duct should, if possible, be routed up
through the roof. If the duct is to be routed out through
an external wall, avoid having an immediate 90° bend
backwards, as this can cause noise and reduced capa-
city.
• The ventilation ducts should be installed in such a way
that it is easy to open the inverter box.
• A duct in a masonry chimney stack must not be used
for extract air.
NOTE
F750 occasionally has a very low extract air
temperature. To avoid damaging the product
and/or the building, it is therefore important
that the extract air duct is insulated with diffu-
sion-proof material (at least PE30 or equivalent)
along its entire length.
TIP
If additional condensation insulation (at least
PE30 or equivalent) dimension Ø 200 is in-
stalled on the outside of the existing exhaust
line between the heat pump and the inner roof,
the noise in the installation room is reduced by
1-2 dB(A).
NIBE F750
EXHAUST AIR DUCT /KITCHEN FAN
Exhaust air duct (kitchen fan) must not be connected to
F750.
To prevent food vapour being transferred to F750 the
distance between the kitchen fan and the exhaust air
device must be considered. The distance should not be
less than 1.5 m, but this can vary between different in-
stallations.
Always use a kitchen fan when cooking.

Ventilation flow

Connect F750 so that all the exhaust air, except kitchen
duct air (kitchen fan), passes through the evaporator
(EP1) in the heat pump.
The ventilation flow must comply with the applicable
national standards.
For optimum heat pump performance, the ventilation
flow should not be less than 21 l/s (75 m³/h).
Set the ventilation capacity in the heat pump's menu
system (menu 5.1.5).
If the exhaust air temperature falls below 6°C, the
compressor is blocked and electric additional heat is
permitted. No energy is recovered from the exhaust air
when the compressor is blocked.

Adjusting ventilation

To obtain the necessary air exchange in every room of
the house, the exhaust air devices must be correctly
positioned and adjusted and the fan in the heat pump
adjusted.
Immediately after installation adjust the ventilation so
that it is set according to the projected value of the
house.
Incorrect adjustment of the ventilation may lead to re-
duced installation efficiency and thus poorer operating
economy, and may cause moisture damage in the
building
Chapter 4 | Pipe and ventilation connections 21