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4
Venting
Asphyxiation Hazard.
•
Failure to vent this boiler in accordance with these instructions could cause products of combustion to enter the
building resulting in severe property damage, personal injury or death.
•
Do not use a barometric damper, draft hood or vent damper with this boiler.
•
Do not locate vent termination under a deck.
•
Do not locate vent termination where exposed to prevailing winds.
•
Do not locate combustion air termination where chlorines, chlorofluorocarbons (CFC's), petroleum distillates,
detergents, volatile vapors or other chemicals are present. Severe boiler corrosion and failure will result.
•
Use specified vent and combustion air pipe diameters.
•
Do not interchange vent systems or materials unless otherwise specified.
•
Do not apply thermal insulation to vent pipe or fittings.
•
Moisture and ice may form on surface around vent termination. To prevent deterioration, surface must be in
good repair (sealed, painted, etc.).
•
Do not allow low spots in the vent where condensate may pool.
•
The CPVC vent materials supplied with this boiler do not comply with Natural Gas and Propane Installation
Code, CAN/CSA B149.1.S1-07 and are not approved for use in Canadian jurisdictions that require vent systems
be listed to ULC S636-2008. In these jurisdictions, vent this boiler using either stainless steel Special Gas vent
or a listed ULC S636 Class IIB venting system.
A. General Guidelines
1. Listed Vent/Combustion Air Systems
a. Install vent system in accordance with
National Fuel Gas Code, ANSI Z223.1/NFPA
54 or Natural Gas and Propane Installation
Code, CAN/CSA B149.1 Installation Code
for Canada, or, applicable provisions of
local building codes. Contact local building
or fire officials about restrictions and
installation inspection in your area.
b. The Apex may be installed as a direct vent/
sealed combustion boiler or with optional
room air for combustion. Direct vent is
recommended for residential applications.
For direct vent, pipe combustion air from
the outdoors directly to the boiler cabinet.
Room air is optional for commercial
applications. For room air, provide
combustion and ventilation air per the
National Fuel Gas Code, ANSI Z223.1, or, in
Canada, Installation Code for Gas Burning
Appliances and Equipment, CGA Standard
B149.
c. The following combustion air/vent system
options are listed for use with the Apex
boilers (refer to Table 4-1):
i.
Two-Pipe CPVC/PVC Vent/Combustion
Air System - Separate CPVC/PVC pipe
serves to expel products of combustion
and separate PVC pipe delivers fresh
outdoor combustion air. Refer to Part B
for specific details.
14
APEX
Installation, Operating, & Service Instructions
!
WARNING
ii.
iii. Two-Pipe Stainless Steel Vent/
iv. Room Air for Combustion – CPVC/PVC,
2. Vent/Combustion Air Piping
a. Do not exceed maximum vent/combustion
air lengths listed in Table 4-2. Vent/
combustion air length restrictions are based
on equivalent length of vent/combustion
air pipe (total length of straight pipe plus
equivalent length of fittings). Table 4-3
lists equivalent lengths for fittings. Do not
include vent/combustion air terminals in
equivalent feet calculations. Use vent/
combustion air equivalent length worksheet
provided in Table 4-4.
Two-Pipe Polypropylene Vent/
Combustion Air System - Separate rigid
or flexible polypropylene pipe serves
to expel products of combustion and
separate rigid polypropylene or PVC
pipe delivers fresh outdoor combustion
air. Refer to Part C for specific details.
Combustion Air System - Separate
stainless steel pipe serves to expel
products of combustion and separate
PVC or galvanized steel pipe delivers
fresh outdoor combustion air. Refer to
Part D for specific details.
polypropylene, or stainless steel pipe
serves to expel products of combustion
and combustion air is supplied from the
boiler room. Refer to Part E for specific
details.
106308-05 - 3/23
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