Model 301GAS burner — Instruction manual
Carlin part number MN301GAS Rev. 11/24/14
– 5 –
Where appliance instructions differ from this manual, follow the appliance instructions.
Figure 2
Locating combustion air/ventilation
openings
1. Prepare site • prepare burner • mount burner
(continued)
Combustion air/ventilation openings
General
Installing the burner/appliance in a space that does not
provide enough air for combustion and ventilation can re-
sult in severe personal injury, death or substantial property
damage. Follow all applicable codes and guidelines below
to ensure space has sufficient air openings.
Exhaust fans and negative pressure conditions — Isolate the
boiler room from areas subject to negative pressure. Size
combustion air openings to ensure neutral air pressure in
the boiler room whenever the burner operates.
Make sure the space provides enough ventilation to prevent
overheating of the appliance, burner and controls. If there is
risk of overheating, you must install ventilation air openings
sized large enough to provide air for cooling the equipment.
Failure to provide ventilation can result in severe personal
injury, death or substantial property damage.
The space and combustion air supply must not contain
corrosive contaminants, such as laundry products, paints,
varnishes or other chemicals.
Sizing air openings
Follow all applicable codes and the appliance instruction manual (when
available) to size combustion air openings. Use the following guidelines
when appliance instructions are not available.
• All air from inside building (building must be well-ventilated):
Size air openings for a free area (after louver deduction) of at least 1
square inch per 1,000 Btuh input of all appliances in the space.
• All air through openings to outside:
Locating air openings
Follow all applicable codes and the appliance instruction manual (when
available) to size combustion air openings. Refer to Figure 2 when ap-
pliance instructions are not available.
Free area estimating
When specific information on the free area of louvers is not available,
estimate free area as:
• wood louvers — free area = area times 0.25.
• metal louvers or grilles — free area = area times 0.60.
• screens, when used must be no smaller than ¼ inch mesh.
Motorized vent dampers
Wire the vent damper end switch to prevent operation of the burner until
the air opening louvers are fully open.
Combustion air/ventilation opening checklist
• Verify that openings are unobstructed.
• Verify that appliance space and air source spaces are free of:
– Gasoline or other flammable liquids or vapors.
– Combustible materials.
– Air contaminants, such as laundry products, paint, thinner, varnish,
etc.
• Confirm with user that the area will be kept free of these materials at all
times.
Verify clearances
• Verify that the burner/appliance will maintain all clearances to combustible
walls or floor and all clearances required for service/maintenance as
required in the appliance manual and applicable codes.
