26
Table L: Category IV Vertical Vent & Vertical Direct Vent
1
Vent lengths are based on a lateral length of 2 ft. Refer to the latest edition of the NFGC for further details.
* Subtract 10 ft per elbow. Max. 4 elbows.
Termination
The vent terminal should be vertical and should termi-
nate outside the building at least 2 ft above the highest
point of the roof that is within 10 ft. The vent cap
Fig. 20: Vertical Venting
Venting Configurations
For heaters connected to gas vents or chimneys, vent
installations shall be in accordance with the NFGC
(U.S.), or B149 (Canada), or applicable provisions of
local building codes.
Vertical Venting (Category IV)
Installation
The maximum and minimum venting length for this
Category IV appliance shall be determined per the
NFGC (U.S.) or B149 (Canada).
The diameter of vent flue pipe should be sized accord-
ing to the NFGC (U.S.) and Appendix B of B149
(Canada). The minimum flue pipe diameter for con-
ventional venting is: 4 in. (102mm) for Models 300,
400 and 500, and 6 in. (152mm) for Models 700 and
850.
The connection from the appliance vent to the stack
must be as direct as possible and shall be the same di-
ameter as the vent outlet. The horizontal breaching of
a vent must have an upward slope of not less than 1/4
inch per linear foot from the heater to the vent termi-
nal. The horizontal portions of the vent shall also be
supported for the design and weight of the material
employed to maintain clearances and to prevent physi-
cal damage or separation of joints.
NOTE:
A vent adapter (field-supplied) may be re-
quired to connect the Category IV vent to the boiler.
Model No.
Certified Vent
Material
Vent and
Intake Air
Vent Size
(in.)
Vertical Vent Height
1
(ft)
Combustion
Air Intake
Pipe
Material
Vertical Air
Inlet Max.
Length* (ft)
Min.
Max.
300
(Canada Only:
ULC-S636 PVC
and CPVC)
Stainless Steel,
AL29-4C,
ANSI/ASTM D1785
Sch 40 PVC,
ANSI/ASTM F441
Sch 40 CPVC
4
0
100
Galvanized
Steel,
PVC, ABS,
CPVC
100
400
500
700
6
850
CAUTION:
This venting system requires the
installation of a condensate drain in the vent piping
per the vent manufacturer’s instructions. Failure to
install a condensate drain in the venting system will
void all warranties on this boiler.
Summary of Contents for H 300 Series
Page 40: ...40 WIRING DIAGRAM...
