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Page 18 / 56 00BNO9132-#
VARMAX TWIN - Installation, Use and Maintenance
Exhaust duct height in linear metres (ml)
(in 50/30°C operating regime)
ø
connection
250 mm 300 mm
ø
duct
300 mm 350 mm 350 mm 400 mm
MODELS
550 15 to 50 3 to 50 -- --
640 16 to 50 3 to 50 -- --
780 -- -- 15 to 50 5 to 50
900 -- -- 33 to 50 6 to 50
!
WARNING:
The values below are provided for information purposes. They must
be checked by calculation.
!
WARNING:
The VARMAX TWIN ue must not be made to support the exhaust
duct's weight.
4.15.3. Connection to a B23P chimney
B23P type connection:
Air from the installation premises, gas evacuation through the roof via a
pressurised duct.
!
WARNING:
For B23P type connection, it is VITAL to use ducts with CONDENSOR
(Poujoulat) type CSTB notice (pressurised ducts).
!
WARNING:
The combustion product extraction duct must be dimensioned by
using the parameters set out in the table in chapter 3.3.
Depending on the actual con guration of the duct, a calculation is
required to check that the pressures at the boiler outlet do not exceed
the maximum allowable values (200 Pa).
Values corresponding to the 50/30°C regime are to be used for this
calculation.
Dimensioning recommendations based on a POUJOULAT (Condensor
type) supply: See the gure on the previous page.
!
IMPORTANT:
Check that the boiler installation premises have high and low
ventilation, that it conforms to current regulations and that it is not
obstructed.
18


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