General Ventilation Connection; Ventilation Flow; Adjusting Ventilation - Nibe F370 Installer Manual

General ventilation connection

Ventilation installation must be carried out in accord-
ance with current norms and directives.
To prevent fan noise being transferred to the ventila-
tion devices, it may be a good idea to install a silencer
in the duct. This is especially important if there are
ventilation devices in bedrooms.
The extract air duct must be a maximum of 20 m long
with a maximum of six bends.
Connections must be made via flexible hoses, which
must be installed so that they are easy to replace. The
extract air duct must be provided with diffusion-tight
insulation over its entire length. Ensure that the con-
densation insulation is 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-section-
al 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. The extract
air duct must be a maximum of 20 m long with a max-
imum of six bends.
Because the heat pump contains the flammable refri-
gerant propane (R290), the air ducting system must be
grounded. This is done by making a good electrical
connection to the exhaust air and vented air ducts us-
ing the 2 ground cables supplied. The cables must then
be connected to the ground studs on top of the top
cover.
Exhaust air duct/kitchen fan
Exhaust air duct (kitchen fan) must not be connected
to F370.
To prevent cooking odours being led to the F370 the
distance between the kitchen fan and the exhaust air
valve must be observed. The distance must not be be-
low 1.5 m, but may vary between different installations.
Always use a kitchen fan when cooking.
NOTE
A duct in a masonry chimney stack must not
be used for extract air.
NIBE™ F370

Ventilation flow

Connect F370 so that all exhaust air except exhaust air
duct air (kitchen fan) passes the evaporator (EP1) in
the heat pump. Lowest ventilation flow must fulfill
applicable norms . For optimum heat pump perform-
ance the ventilation flow should not be less than 28
l/s (100 m3/h) at an exhaust air temperature of at least
20 °C. On occasions when the exhaust air temperatures
are lower than 20 °C (for example on start up and when
there is no one in the accommodation) the minimum
value is 31 l/s (110 m3/h).
The heat pump's installation area should be ventilated
with at least 5 l/s (18 m³/h). The installation area must
have a volume of at least 8 m³.
Ensure that the ventilation openings are not blocked.
Set the ventilation capacity in the heat pump's menu
system (menu 5.1.5).

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.
The factory setting for the ventilation on the heat pump
is low and you should therefore adjust the ventilation
immediately after installation so that it is set according
to the projected value for the house.
A defective ventilation installation may lead to reduced
installation efficiency and thus poorer operating eco-
nomy, and may result in moisture damage to the house.
Chapter 4 | Pipe and ventilation connections 17