Installation / Operation Instruction Manual

Page 15
INTAKE / EXHAUST
Max Equivalent
Size Diameter Ft M
1600 6” 100 30
2000 / 2500 8” 100 30
3000 / 3500 10” 100 30
4000 12” 100 30
Combustion Intake and Vent must be the same size.
Installations in the U.S. require exhaust vent pipe that is
CPVC complying with ANSI/ASTM D1785 F441, poly-
propylene complying with ULC S636, or stainless steel
complying with UL1738. Installations in Canada require
exhaust vent pipe that is certied to ULC S636.
Intake (air) pipe must be PVC or CPVC that complies with
ANSI/ASTM D1785 F441, ABS that complies with ANSI/
ASTM D1527, stainless steel, or galvanized material.
To calculate max equivalent length, measure the linear feet
of the pipe and add 5 feet (1.5 m) for each elbow used.
Table 9. Category IV Vent/Air Pipe Diameters
2.C.1 Category lV Vent Sizes
Positive pressure vent systems may be either
horizontally or vertically vented. The vent pipe
used must be suitable for positive pressure, per the
requirements shown in Section 2.B. Table 9 shows
the pipe size and allowable maximum equivalent feet
of piping allowed for both air and vent in a Category lV
system.
The forced draft combustion air blower in the unit has
su󰀩cient power to vent properly when the guidelines in
Table 9 are followed.
WARNING
The venting must be installed with appropriate
condensate traps and using only specic
manufacturers, models and materials outlined in this
manual. Draft must always remain between -0.1” and
-0.001” at all ring rates. If pressures outside of this
range are measured, consult professional venting
engineer for recommendations, such as double-acting
barometric dampers to avoid reduced performance or
hazardous conditions.
Table 10. Category ll Vent/Air Pipe Diameters
2.C.2 Category II Vent Sizes
Non-positive pressure vent systems are generally
vertically-terminated. Table 10 gives guidelines for vent
and air pipe sizes, but the draft must be measured to
ensure that it remains between -0.1”w.c. and -0.001”w.c.
at all ring rates.
2.C.3 Common Venting
This unit can be common vented, however, the common
venting must be a professionally designed and approved
system. See Document 1396.pdf Application Guide
for Common Venting (commercial condensing,
available online. See Back Cover)
Category II and IV units are never permitted to share
a vent with any Category 1 units.
Model
Vent/Air
Connector
Size on
Unit
Vent Pipe
Size
Guideline
Air Pipe
Size
1600
6" (15 cm)
14" (36 cm)
6" (15 cm)
2000
8" (20 cm)
14" (36 cm)
8" (20 cm)
2500
8" (20 cm)
18" (46 cm)
8" (20 cm)
3000
10" (25 cm)
18" (46 cm)
10" (25 cm)
3500
10" (25 cm)
22" (56 cm)
10" (25 cm)
4000
12" (30 cm)
22" (56 cm)
12" (30 cm)
Table 10. Category II Vent/Air Pipe Diameters