Combustion Air Supply; Buildings With Adequate Air Infiltration; Buildings With Less Than Adequate Air Infiltration; Minimum Burner And Appliance Clearance - Beckett CG15 Manual

Combustion Air Supply

Carbon Monoxide Hazard
Do not block combustion air inlet. Failure to provide
adequate air supply could seriously affect the burner
performance and result in damage to the equipment
and emission of poisonous carbon monoxide gas.
Some local codes and gas utilities require the installation
of a CO detector, this is strongly recommended in all
applications. Consult with your heating contractor or a
home security agency.

Buildings with Adequate Air Infiltration

In many cases, a burner operating in an unconfined
space of a conventional frame, brick or stone building
will receive adequate air supply from leakage in the
building itself. But if the burner is located in a confined
space such as a furnace or boiler room, that space must
have one permanent opening toward the top of the
space and one near the bottom of the space.
Each opening must have a free area of not less than one
sq. in. per 1,000 BTU per hour of the highest input rating
listed for the appliance (refer to NFPA 54 & 58).
Remember to take the total input of all air-using
appliances into consideration when figuring the
openings. The openings must connect with the inside
of the building, which should have adequate infiltration
from the outside.
As an example:
If a gas burner was firing at 350,000 BTU/Hr, in an
enclosed room in a building each opening in the
enclosure should be 350 sq. in. (350,000/1,000 x 1 sq.
in. = 350 sq. in.) A 350 sq. in. opening would typically
be 12"x30" or 19"x19" .
Buildings with Less Than Adequate Air
Infiltration
If the burner is located in a tightly constructed building
where there is inadequate outside air infiltration, outside
combustion air must be supplied by some other means.
One method to accomplish this is through a permanent
opening(s) in an exterior wall. The opening, or openings,
must have a total free area of not less than one sq. in.
per 5,000 BTU per hour. All appliances must be taken
into consideration. Refer to NFPA 54 & 58.
12 — Section: Inspect & Prepare Installation Site

Minimum Burner and Appliance Clearance

• Provide at least 15 inches of space around the
burner for easy service and maintenance.
• Check minimum clearances against those shown
by the appliance manufacturer and by applicable
building codes.

Fuel Gas Supply

Explosion, Fire, and Gas Leak Hazard
Provide Over-pressure Protection
The National Fuel Gas Code, ANSI Z223.1 (NFPA
54) and ASME CSD-1 require that if gas pressure
entering the building exceeds the rating of any
gas train component an overpressure protection
device must be installed.
Explosion and Fire Hazard
Never use an open flame for leak testing supply piping
or equipment.
Never use Oxygen for leak testing or purging of fuel
supply piping.
Gas supply piping must be structurally supported
independent of the burner. The burner manifold and gas
valve are not designed to support piping loads.
A typical gas piping layout is shown in Figure 7 .
The gas supply system must be sized to deliver at least
the minimum required pressure to the gas train inlet.
The installer must verify:
• Piping design meets all applicable codes.
• Piping and components are inspected and in good
working condition.
• Piping is sized correctly to supply required gas
pressure to the burner and any other gas appliances
in the facility.
• Newly installed gas supply piping must be pressure
tested as outlined in ANSI Z223.1 / NFPA 54.
CG15, CG25, CG50 Burner Manual, Form No. 6104BCG50