A duct in a masonry chimney stack must
not be used for extract air.
Note!
General
FIGHTER 640P works in average size houses, with both
exhaust air and outdoor air. This gives greater savings than
by using just exhaust air. However, at outdoor tempera-
tures below approximately - 5 °C, the outdoor air flow is
closed by means of an internal damper and the heat pump
now works with just the exhaust air. In larger houses only
the exhaust air ducts are connected as the exhaust air here
contains sufficient amounts of energy.
Ventilation flow
FIGHTER 640P is connected so that all ventilation air ex-
cept the kitchen fan passes the evaporator (62) in the heat
pump. The lowest ventilation flow according to current
standards is 0.35 l/s per m
2
floor area. For optimum heat
pump performance this ventilation flow should not be
less than 120 m
3
/h (34 l/s). With exhaust air flow greater
than 250 m
3
/h the outdoor air duct is not connected.
Accordingly FIGHTER 640P is only used as an exhaust air
heat pump.
In those cases the exhaust air flow falls below 250 m
3
/h an
outdoor air duct with adjustment damper should be con-
nected to the heat pump. The heat pump then normally
works with the fan at maximum, when the compressor is
running. The maximum capacity of the fan is then distribut-
ed between the planned exhaust air and outdoor air. With
outdoor temperatures lower than approximately - 5 °C the
fan automatically slows down to the selected setting and
the heat pump’s internal damper shuts out the outdoor air,
whereby the planned exhaust air flow is maintained.
The heat pump’s installation area should be ventilated by at
least 36 m
3
/h (10 l/s).
FIGHTER 640P is equipped with a ventilation opening in
the base. As a result, an air flow of about 5 m
3
h (1,4 l/s) is
taken directly from the room.
Setting the ventilation capacity is described in
“Commissioning and adjusting” – ”Setting the ventila-
tion”. See also the Circuit diagram.
Ventilation connection
Duct installation
To prevent fan noise being transferred to the exhaust air
devices, it may be a good idea to install a silencer in the
duct. This is especially important if there are exhaust air
devices in bedrooms. If a twin duct system is used for the
exhaust air, each system should be fitted with a silencer.
Because the heat pump contains a flammable refrigerant
in the form of propane (R290), the air ducting system must
be earthed. This is done by making a sound electrical con-
nection to the exhaust air, extract air and outdoor air ducts
using the three earthing cables supplied. The cables must
then be connected to the earthing studs on top of the top
cover.
Duct connections should be made via flexible hoses, which
must be installed so that they are easy to replace. The
extract air and outdoor air ducts are to be insulated using
diffusion-proof material along their entire lengths. Provision
must be made for inspection of the duct. The outdoor air
duct should be fitted with an adjustment damper. 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. All joins in the ducting must be
sealed and pop-riveted to prevent leakage.
When the exhaust air flow is so great that no outdoor air
duct is fitted and the ventilation system is connected only
to the exhaust air sleeve the outdoor air sleeve should be
sealed. If the ventilation system is connected to both the
exhaust air sleeve and the ordinary outdoor air sleeve the
damper motor should be electrically disconnected. This is
done by removing the damper motor’s cable ends on the
relay card (terminals 36, 37 and 38) from the relay card
and then insulated. The damper can now be turned to the
open position by hand when the damper motor’s knob is
pressed in.
The air duct system should, at a minimum, be of air tight-
ness class B.
To Next Page
Loading...
