Combustion Air - Baxi Bioflo Installation & Servicing Instructions Manual

For the Installer

2.3.4 Combustion air

An adequate supply of combustion air is absolutely essential. The following combustion air flow is required for
operation at max. heat output:
FireWIN 90 (9 kW):
FireWIN 120 (12 kW):
There are various possible ways of supplying the combustion air:
a) Operating with room air
(Combustion air supply from the installation room or adjacent room)
b) Operating independently of the room air
(Combustion air supply from ventilation draught in the chimney)
Note: There may be an induction noise from the air supply induction point (air opening in the device), depending on
the modulation. The noise can be transferred outside or into an adjacent room by relocating the air supply induction
point.
Negative pressures in the installation/induction room with point a) Operating with room air are not permitted.
The function and safety of FireWIN is affected when combining with room ventilation systems and combustion
air supply from the installation room or adjacent room. Room ventilation systems must switch off automatical-
ly when the negative pressure in the device is more than 4 Pa below the external pressure. Special ventilation
systems are available for controlled living area ventilation in combination with solid fuel systems – refer to infor-
mation provided by the manufacturers of ventilation systems.
If ventilation systems (e.g. extractor hoods or pneumatic pumping systems, etc.), we recommend routing the
combustion air according to point b) Operating independently of the room air. This means it is possible to decou-
ple the combustion air from the air conditions in the installation room to a large extent.
In addition, the device is equipped as standard with a pressure monitoring device in the fire box in order to
guarantee safe operation of the device.
a) Operating with room air:
(Combustion air supply from the installation room or adjacent room)
Always ensure there is a sufficient combustion air supply (no windows and doors that provide a complete
air seal).
Combustion air supply from a well ventilated adjacent room via an air intake pipe.
The combustion air is carried along an air intake pipe from a well ventilated adjacent room (e.g. stairwell) to
the FireWIN. This avoids the induction noise in the installation room during operation. The accessory FIRE
024 is also required for this variant. The air supply is carried in commercially available plastic pipes
mm. The maximum induction length is 9 m, each 90° bend
Combustion air supply directly from the installation room:
The combustion air is drawn directly by the device from the installation room, therefore the installation room
has to be adequately ventilated.
Malfunctions or complaints occasioned by inadequate combustion air will not be covered by the
guarantee!
b) Operating independently of the room air:
(Combustion air supply from ventilation draught in the chimney)
This variant is to be preferred over operating with room air, because it ensures that there will always be suffi-
cient combustion air and that the induction noise during operation will be transferred to the outside.
The accessory FIRE 024 is required for this operation. The air supply is carried in commercially available plastic
pipes of diameter 75 mm. The maximum induction length is 9 m, each 90° bend reduces the length by 1 m.
3
approx. 20 m /h
3
approx. 26 m /h
1) reduces the length by 1 m.
10
1) Ø 75