installation manual

Installation | 35
6 720 806 992 (2013/07)Greenstar
Direct vent installations (sealed combustion)
For direct vent applications all applicable items below must be met.
Fig. 26 Vent and combustion air pipe position of a sealed combustion
system
[1] Intake
[2] Exhaust
X At least 1 foot (305 mm)
The termination shall terminate at least 1 foot (305 mm) below, 1 foot
(305 mm) horizontally from or 1 foot (305 mm) above any door,
window or gravity air inlet into any building ( fig. 27 [2], [X
1
], [X
3
],
page 37).
If multiple boilers are installed in a row, allow at least 1 foot (305 mm)
clearance between the vent termination of one and the combustion air
intake of the other.
Vent termination must be at least 1 foot (305 mm) above grade,
anticipated snow line or roof surface (Canada
1-1/2 feet (457 mm) minimum) ( fig. 27 [Y
A
], page 37).
Vent termination must be at least 7 feet (2135 mm) above a public
walkway ( fig. 27 [X
5
], page 37). Ensure that condensate spilling
from the termination does not create a hazard or a nuisance.
Vent termination must be 3 feet (915 mm) above any forced air intake
within 10 feet (3 050 mm) ( fig. 27 [1], [Y
B
], page 37).
Do not extend exposed vent pipe outside the building beyond
recommended distance. Condensate could freeze and block vent pipe.
Vent should terminate at least 3 feet (915 mm) away from adjacent
walls, inside corners and 5 feet (1 525 mm) below roof overhang
( fig. 27 [X
2
], [X
4
], page 37).
It is not recommended to terminate vent above any door or window,
condensate can freeze causing ice formations.
Do not use chimney as a raceway if another boiler or fireplace is vented
into or through chimney.
All PVC/CPVC vent pipes must be glued, except for the flue gas adapter-
pipe connection.
All PP/PVC/CPVC combustion air and vent pipe materials and fittings
must comply with the following and must be UL approved venting
material:
X
X
XX
1
2
6 720 641 933-19.1O
The exhaust pipe must be properly supported and
pitched a minimum of ¼ inch (6.35 mm) per foot back to
the boiler. This allows the condensate to properly drain.
NOTICE: Damage of 2 inch PVC pipes.
▶ For ZBR42-3A and ZWB42-3A use 2 inch CPVC-pipes
or 3 inch pipes.
Material Item United states Canada
ZBR16-3A ZBR28-3A ZBR35-3A ZBR42-3A
ZWB28-3A ZWB35-3A ZWB42-3A
PVC schedule 40, 80
2" (50 mm) Vent or
air pipe and fitting
ANSI/ASTM D1785
BH Gas venting
systems,
ULC S636
1)
1) Components of the certified vent systems must not be interchanged with other vent systems or unlisted pipe fittings. Plastic components, and specified primers and glues of
the certified vent system must be from a single system manufacturer and not intermixed with other system manufacturer's vent system parts.
XXX XX
PVC-DWV ANSI/ASTM D2665 XXX XX
CPVC schedule 40, 80 ANSI/ASTM F441 XXXXXXX
PVC schedule 40, 80
3" (76 mm) Vent or
air pipe and fitting
ANSI/ASTM D1785 XXXXXXX
PVC-DWV ANSI/ASTM D2665 XXXXXXX
CPVC schedule 40, 80 ANSI/ASTM F441 XXXXXXX
PP
3" (80 mm) vent or
air pipe M&G/
DuraVent PolyPro
GreenVent
ANSI Cat IV XXXXXXX
PP ANSI Cat IV XXXXXXX
PP
3"/5" (80/125 mm)
concentric M&G/
DuraVent PolyPro
GreenVentt
ANSI Cat IV XXXXXXX
PP ANSI Cat IV XXXXXXX
PVC
Pipe cement/primer
ANSI/ASTM D2564 XXXXXXX
CPVC ANSI/ASTM F493 XXXXXXX
Table 17 Materials for pipe