Brano ATESO ALFA D2 - Page 6

The service book IV / ALFA 6 03-9940.186
Heating air
Air ducts - if needed - must be made as short as possible with the lowest number of bends. Their caliber
along the whole length must not be less than 55 mm and it is advisable to make the bends smoothly. If it is
inevitable to change a duct section from a circle to square, the opening must be increased at least by 50%.
If a suction duct or a distributor duct is terminated in a higher number of holes (e.g. a grid), the sum of the
sections of these holes must not be less than the caliber of the duct.
The intake and the outtake of the heated air must be situated so that the hot air cannot flow directly back
into the heater. It is advisable to provide the ducting with a thermal insulation, especially the parts going
outside the heated area.
The surface temperature of the immediately accessible locations and distributing output channels must not
get over +70°C, at metals and other materials +80°C (E/ECE/324-121 requirement of Regulation No. 122,
Annex 5). Therefore, the distributing output channels must be protected by a cover or insulation.
ATESO  60 mm
 The maximum length of the straight piping with 60 mm is 10 m ( intake + outtake)
 the maximum number of elbows for air distribution is 5 pieces and each element shorts pipeline of 1 m
 the maximum number of T-units for air distribution is 5 pieces and each element shorts pipeline of 1 m
 the maximum number of bends in the middle radius of 120 mm is 5 pieces and each bend leads to a
reduction of 1 m
 An outlet socket and an outlet gird mean shortening the pipeline 1m.
 A socket with a flap can be used only in the event that will be more outlets, at least one of them will not
be closed (a socket with a flap must not be used alone)
 The minimum distance between a vertical wall and the heater intake is 50 mm. The minimum distance
between a vertical wall and the heater outtake is 100 mm, while the opposite wall must be resistant to
temperatures of 150 °C.
BREEZE  75 mm
 The maximum length of the straight piping with 75 mm is 10 m ( intake + outtake)
 the maximum number of elbows for air distribution is 5 pieces and each element shorts pipeline of 1 m
 the maximum number of T-units for air distribution is 5 pieces and each element shorts pipeline of 1 m
 the maximum number of bends in the middle radius of 120 mm is 5 pieces and each bend leads to a
reduction of 1 m
 An outlet socket and an outlet gird mean shortening the pipeline 1m.
 A socket with a flap can be used only in the event that will be more outlets, at least one of them will not
be closed (a socket with a flap must not be used alone)