General Ventilation Connection; Ventilation Flow; Adjusting Ventilation - Nibe F470 Installer Manual

General ventilation connection

Ventilation installation must be carried out in accordance
with current norms and directives.
To prevent fan noise being transferred to the ventilation
devices, install silencers in the ducts.
Connections must be made via flexible hoses, which
should be installed so that they are easy to replace. The
extract air and outdoor air ducts are insulated using dif-
fusion-proof material (PE30) along their entire lengths.
Ensure that the condensation insulation is fully sealed
at any joints and/or at lead-in nipples, silencers, roof
cowls or similar. 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 duct system must be a minimum of air
tightness class B. The extract air duct must be a maximum
of 20 m long with a maximum of six bends.
Because the heat pump contains the flammable refriger-
ant propane (R290), the air ducting system must be
earthed. This is achieved by making a good electrical
connection to the four ventilation ducts using the en-
closed earth cables (4 pcs). The cables must then be
connected to the earth pins on top of the top cover.
Exhaust air duct /kitchen fan
Exhaust air duct (kitchen fan) must not be connected to
F470.
To prevent food vapour being transferred to F470 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.
NOTE
A duct in a masonry chimney stack must not be
used for extract air.
Supply air
Outdoor
Exhaust air
air
20 Chapter 4 | Pipe and ventilation connections
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Extract air

Ventilation flow

Connect F470 so that all of the exhaust air, except kit-
chen duct air (kitchen fan), passes the evaporator (EP1)
in the heat pump. The lowest ventilation flow must
comply with the applicable national standards. For op-
timum heat pump performance, the ventilation flow
should not be less than 28 l/s (100 m³/h) at an exhaust
air temperature of at least 20°C. When the exhaust air
temperature is lower than 20°C (for example at start-up
and when there is nobody at home), the minimum value
is 31 l/s (110 m³/h). The supply air flow must be lower
than the exhaust air flow to prevent over pressure in the
house.
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The heat pump's installation area must be ventilated to
at least 5 l/s (18 m³/h)
Ensure that the ventilation openings are not blocked.
Set the ventilation capacity in the heat pump's menu
system (menu 5.1.5).
(menu 5.1.5)
If the exhaust air temperature falls below 16 °C, the
compressor is blocked and electric additional heat is
permitted. Heat is not 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 device and the supply air
device must be correctly positioned and adjusted and
the fans 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 ventilation adjustment may lead to reduced
installation efficiency and thus poorer operating eco-
nomy, and may result in moisture damage to the house.
440
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Undvik rördragning
inom markerat område
Ø125
550
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NIBE F470