Install Instructions (Venting)

15
2
.1.4 Direct Vent - Multiple Boiler Installation -
Through the Roof
1. On installations of multiple PRESTIGE boilers, ter-
minate the vent and combustion air piping as
described in this manual.
2. The roof penetration of the vent and combustion air
piping should be such that the combustion air inlet is
a minimum 12” [30.5 cm] from the adjacent vent pipe
of the other boiler for installations in the U.S. as
shown in Fig. 5 on page 16. For installations in
Canada, provide clearances as required by
CAN/CSA B149.1.
The combustion air inlet of the PRESTIGE is defined
as being part of a direct vent system. It is not con-
sidered as a forced air intake. The required clear-
ance of an adjacent boiler vent to a forced air inlet
does not apply in a multiple installation of PRES-
TIGE boilers.
NOTICE
4. The installer must comply with all local codes for iso-
lating the vent and combustion air pipes as they
pass through floors, ceilings and roofs.
5
. The installer should provide adequate flashing and
sealing boots sized for the vent pipe and combustion
air pipe.
2.1.3 Termination Fittings - Through the Roof
1. The vent and combustion air terminations must include
a factory supplied “bird screen” installed as shown in
Figs. 3 & 4 on page 16.
2. The combustion air piping must terminate in an
upside down “U” shape fashion using two 90º
elbows as shown in Fig. 1 on page 14.
3. The vent piping must terminate vertically with a cou-
pling as shown in Fig. 1 on page 14.
Do not extend the vent pipe above the roof beyond
the dimensions shown in Fig. 1 on page 14.
Extended exposure of the vent pipe could cause
condensate to freeze and block the vent pipe.
WARNING
2.0 Direct Vent Installation of Vent/Air Piping
Termination Clearances of Direct Vent
System
Fig. 2: