Install Instructions

16
Figure 12: Typical Vent Installation
4. Do not connect into same leg of chimney serving an
open replace.
5. Inspect chimney for obstructions or restrictions and
remove. Clean chimney if necessary.
6. Vent pipe to chimney must not be smaller than outlet
on draft hood or damper. Although single wall vent
pipe may be used, Type B is recommended. The
venting system must be arranged so that only the
boiler is served by the damper device. Installation
per paragraph (C) complies with this provision.
Exception: National Fuel Gas Code, ANSI
Z223.1/ NFPA 54, and Natural Gas and Propane
Installation Code, CAN/CSA B149.1, allow vent
downsizing when vent size determined by their
Vent Sizing Tables is smaller than draft hood
outlet/vent damper. These codes require all of
the following:
(a) Total vent height (H) is at least 10 ft (3 m);
(b) Vent not reduced more than one table size;
and
(c) Draft hood outlet/vent damper is greater
than 4 in. (102 mm) in diameter (202, 202X
and 203 cannot use smaller vent size).
7. Where two or more appliances vent into a common
vent, the area of the common vent should at least
equal the area of the largest vent plus 50% of the
area in the additional vents. Do not connect the vent
of this appliance into any portion of mechanical
draft system operating under positive pressure.
8. Vent pipe should have the greatest possible initial
rise above the draft hood consistent with the head
room available and the required clearance from
adjacent combustible building structure. Vent Pipe
should be installed above the bottom of chimney to
prevent blockage.
V. VENTING (continued)
9. Slope horizontal portions of vent pipe upwards not
less than 1/4 in/ft (21 mm/m) from boiler to vent
terminal.
les chaudiêres de catégories I doivent présenter des
tronçons horizontaux dont la pente montante est d'au
moins 1/4 po par pied (21 mm/m) entre la chaudiêre
et l'évent.
10. Support horizontal portions of venting system to
prevent sagging. Use pipe straps, brackets or
hangers spaced 4 ft (1.2 m) or less.
Soutenez parties horizontales de ventilation pour
éviter l'affaisement. Utilisez des colliers de serrage,
des crochets on cintres espacées de 4 preds (1,2 m)
ou moins.
11. Vent pipe must be inserted into but not beyond
inside wall of chimney liner. Seal tight between vent
pipe and chimney.
12. Do not install non-listed (AGA, CGA, CSA, ETL or
UL) vent damper or other obstruction in vent pipe.
WARNING
E. IF AN EXISTING BOILER IS REMOVED -
When an existing boiler is removed from a common
venting system, the common venting system is likely to
be too large for proper venting of the appliances
remaining connected to it.
At the time of removal of an existing boiler, the
following steps shall be followed with each appliance
remaining connected to the common venting system
placed in operation, while the other appliances
remaining connected to the common venting system are
not in operation:
1. Seal any unused openings in the common venting
system.
2. Visually inspect the venting system for proper size
and horizontal pitch and determine there is no
blockage or restriction, leakage, corrosion, and other
deciencies which could cause an unsafe condition.
3. Insofar as is practical, close all building doors and
windows and all doors between the space in which
the appliances remaining connected to the common
venting system are located and other spaces of the
building. Turn on clothes dryers and any appliance
not connected to the common venting system. Turn
on any exhaust fans, such as range-hoods and
bathroom exhausts, so they will operate at maxi mum
speed. Do not operate a summer exhaust fan. Close
replace dampers.
4. Place in operation the appliance being inspected.
Follow the Lighting (or Operating) Instructions.
Adjust thermo stat so appliance will operate
continuously.