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Edition: 06 / 2015 Page 27 / 146
VARMAX - Installation, Use and Maintenance
Chimney ues must be dimensioned considering the combustible gas
pressure at the boiler outlet of 0 Pa (see table § 3.3, page 15).
The ue-gas 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 capable of supporting temperatures up to 120°C. Horizontal
duct runs must be avoided so as not to cause condensate retention.
Check that the fuel gas is extracted via a gas-tight duct.
VARMAX boilers are ef cient boilers with very low ue-gas temperatures;
as a result, to maintain favourable ventilation, the ducts must run
upwards from the boiler outlet.
!
IMPORTANT:
If several boilers are connected to a single ue, check:
1. that the ue is not under pressure when all the boilers are in
operation.
2. If one of the boilers is operating at minimum power, that the
others do not discharge into it.
Sizing recommendations based on a POUJOULAT system (Condensor
type):
ø connection
ø duct
H
3 m
gure 17 - B23 sizing recommendations
27


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