27.08.2018
21 / 136
EVO S -
Installation and Servicing
4.3.1.
Connection to a B23 chimney
B23 type connection:
Air from the installation premises, gas evacuation through the roof via a
natural draft pipe.
IMPORTANT:
Check that the boiler installation premises have high and low
ventilation, that it conforms to current regulations and that it is not
obstructed.
For the
EVO S 50
, the use of the
ø
125 Chimney Adaptor accessory (code
219530) is mandatory to connect the boiler to a B23 chimney duct. This kit is
suitable for Ø 125 external ducts.
For the
EVO S 70 to 135
, the use of the
ø
160 Chimney Adaptor accessory
(code 219531) is mandatory to connect the boiler to a B23 chimney duct.
This kit is suitable for Ø 160 external ducts.
IMPORTANT:
Under no circumstances is use of these mandatory accessories a
substitute for checking the dimensioning of the chimney ducts (given
a combustion gas pressure at the boiler outlet equal to 0 Pa).
VARFREE boilers are high performance boilers with very low exhaust
temperatures; consequently to retain a favourable draft the ducts must run
upwards from the boiler outlet.
Horizontal duct runs must be avoided so as to limit condensate retention. To
do this use a minimum slope of 3 % towards the boiler in the horizontal parts.
WARNING:
If several boilers are connected to one flue, check by calculation that
the flue is not pressurised when all the boilers are operating at Qn.
ø
duct
EVO S
Accessory
part number
A (mm)
ø
125
50
219530
310
ø
160
70 to 135
219531
390
