COSMOGAS MYDENS, Installation, Use And Maintenance Manual

Page: 24 / 76

24
MYDENS
COSMOGAS
During operation, especially in the winter, due to high
efficiency, white smoke may escape from the appliance
exhaust. This is solely a natural phenomenon and must
not be worried about in any case, because it is the water
vapour present in the fumes which in contact with the
outside air, condensates.
5.16.1 - Type of intake/exhaust B23
In the case of B23 type combustion agent air/fumes exhaust
systems, it is indispensable that the rooms in which the
appliances are installed have at least as much air as that
required by combustion and ventilation of the room. It is
therefore good practice to remember that the combustion of
1 m³ of gas requires 11 cm³ of air.
The natural flow of air must take place directly through
permanent openings made in the outside walls of the room to
be ventilated; however away from sources of pollution, such
as: vents of dubious origin, airborne industrial exhaust etc.
The ventilation openings must meet the following requirements:

have sections with net passage of at least 6 cm² for
every kW of heat input installed, with minimum of 100
cm²;

be realised in a way that the opening inlets both inside
and outside the wall cannot be blocked;

be protected, for example with grids, metal meshes, etc..
The net section of the passage must not be reduced by
these elements;

ebe situated at a height more or less of the floor
and such not to disturb the correct operation of the
combustion products exhaust devices. Where this
position is not possible, the section of the ventilation
openings must be increased by at least 50%.
The flow of air can also be obtained from an adjacent room
as long as:

it has direct ventilation, in compliance with the previous
points;

in the room to be ventilated, only appliances fitted to
exhaust pipes are installed;

the adjacent room is not a bedroom;

the adjacent room is not a common part of the building;

the adjacent room is not an environment with fire hazard,
such as a hangars, garages, combustible materials
warehouse, etc.;

the adjacent room does not have a negative pressure with
respect to the room to be ventilated due to reverse draught
(which can be caused by the presence in the room of
another appliance operating with any type of fuel, a fireplace
and any other intake device for which an adequate air intake
has not been envisioned);

the flow of air from the adjacent room to that to be ventilated
can take place freely through permanent openings with
total net section not less than that indicated at the start of
this chapter.
In rooms where gas appliances are installed, it may become
necessary, as well as the input of combustion agent air, also
to evacuate the stale air, with resulting release of an additional
equal amount of clean air.
If the stale air is evacuated with the aid of a mechanical tool
(electric fan) the following conditions must be respected:
a) if there is a common exhaust pipe in the room, it must be
capped;
b) the ventilation opening of the room in which the gas
appliance is installed must be increased depending on the
maximum air flow rate required at the electric fan.
c) the action of the electric fan must not affect the correct
evacuation of the combustion products. To this end, that
stated above must be verified by draft testing, running the
fan or extractor hood at its maximum power and the gas
appliance at the maximum and minimum power.
5 - INSTALLATION