Weil-McLain CGi 4 Series Manual page 17

CGi
SERIES 4 — GAS-FIRED WATER BOILER —
3e
Venting — direct exhaust — termination
The vent termination must be located to meet all requirements below (also applies to vertical vent terminations). The
minimum distance from adjacent public walkways, adjacent buildings, openable windows and building in the National
Fuel Gas Code, ANSI Z223.1/NFPA 54 – latest edition and/or the Natural Gas and Propane Installation Code, CAN/CSA
B149.1. The vent termination clearances below are for U.S.A., for Canadian vent termination clearances please refer
to the requirements of CSA B149.1 Natural Gas and Propane Installation Code. Consideration should be given to avoid
possible damage caused by vent plumes and condensate when choosing a venting configuration and location. Maintain
a minimum clearance of 4 ft. (1.22m) horizontally from, and in no case above or below, unless a 4 ft. (1.22m) horizontal
distance is maintained, from electrical meters, gas meters, regulators, and relief equipment.
Follow instructions on this page when de-
termining vent location to avoid possibility of
severe personal injury, death or substantial
property damage.
1. Locate the boiler and vent penetration through the wall so
all requirements on this page and in Figure 12 will be met.
Also follow vent manufacturer's instructions.
2. Gases will form white plume in winter. Plume could obstruct
window view.
3. Prevailing winds could cause freezing of condensate and
water/ice buildup on vent termination, building, plants or
roof. Ice buildup on vent termination can cause boiler
shutdown and building freeze up.
4. Winds over 31 mph can cause nuisance boiler shutdown
if boiler is sidewall vented. This could result in loss of heat
to building, causing freeze up.
5. Locate or guard vent termination to prevent condensate
from damaging exterior surfaces.
6. Locate the vent termination well away from trees, shrubs,
and decorative items.
7. Locate or guard vent to prevent accidental contact by
people or pets.
8. Do not terminate vent in window well, stairwell, alcove,
courtyard, or other recessed areas.
9. Do not wrap or insulate vent pipe or fittings.
10. Do not terminate vent above any door or window. Con-
densate can freeze, causing ice formations.
11. Do not connect:
• Any other appliance to vent pipe.
• Multiple boilers to a common vent pipe.
Figure 12 Vent termination minimum clearances
Part Number 550-142-302/0124
Boiler Manual
12. Canadian installations — See B149.1 or B149.2 Natural
Gas and Propane Installation Code. Terminate vent no
less than 6 feet from another combustion air inlet, 3 feet
from any other building opening, and 3 feet from any gas
service regulator.
13. See Figure 12, showing that the vent must terminate:
• more than 4 feet below or to side of all doors or windows.
• more than 1 foot above grade or anticipated snow line.
• at least 7 feet above public walkway.
• 3 feet above any forced air intake within 10 feet.
14. Vent must also terminate:
• at least 6 feet away from adjacent walls.
• no closer than 5 feet below roof overhang.
• at minimum of 4 feet horizontally (and in no case
above or below unless a 4 foot horizontal distance
is maintained) from electric meters, gas meters,
regulators, relief valves, and other equipment.
15. Site conditions may dictate greater clearances.
16. Do not extend exposed vent pipe outside of building more
than 4 feet.
Condensate could freeze and block vent pipe.
A gas vent extending through an exterior
wall shall not terminate adjacent to the wall
or below building extensions such as eaves,
parapets, balconies or decks. Failure to
comply could result in severe personal injury,
death or substantial property damage.
17