Combustion Air Supply; Buildings With Adequate Air Infiltration; Buildings With Less Than Adequate Air Infiltration; Clearances To Burner And Appliance - Beckett CG10-24 Manual

Section: INSPECT/PREPARE

Combustion Air Supply

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.
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.

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.
Burner Manual — CG10-24
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.

Clearances to Burner and Appliance

Provide space around burner and appliance for easy
|
service and maintenance.
Check minimum clearances against those shown
|
by the appliance manufacturer and by applicable
building codes.
The recommended clearance around the burner
|
itself is 12" minimum for service access.

Fuel Gas Supply

Gas supply piping must be
structurally supported
independent of the burner. The burner manifold and
gas valve are not designed to support piping loads.
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.
A typical gas piping layout is shown in Figure 8 on page 12.
INSTALLATION SITE
11