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Edition: 02 / 2015 Page 17 / 56
VARMAX TWIN - Installation, Use and Maintenance
4.15.2. 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.
The size of the chimney pipes must be determined taking account of
combustion gas pressure on boiler output equal to
0 Pa (see table § 3.3).
The exhaust extraction ducts must be made in a material resistant to the
condensate that can form when the boiler is operating. These materials
must also be able to withstand exhaust temperatures up to 120°C. Horizontal
pipes must be avoided to limit condensation build-up.
Check that the combustion gas is evacuated via a sealed connection.
VARMAX TWIN 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.
!
WARNING:
Check:
1. That the ue is not under pressure, with both generators operating.
2. If one of the generators is operating at minimum power, that the
other generator does not discharge into it.
Dimensioning recommendations based on a POUJOULAT type
(Condensor type) supply:
gure 8 - Sizing recommendations
ø connection
ø duct
H
(1 m)
hose PROHIBITED
for the elbow joint
!
17


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