Carlin 702GAS Inst Manual - Manual (Page 7)

Model 702GAS Advanced gas burners — Instruction manual
Carlin part number MN702G Rev. 03/14/11 – 7 –
Where appliance instructions differ from this manual, follow the appliance instructions.
2. Prepare site • assemble burner • mount burner
(continued)
Combustion air/ventilation openings
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 directly from outside the building through an
adjacent outside wall:
If air openings connect directly to outside, provide two openings, one
within 12 inches of the ceiling, the other within 12 inches of the floor.
Each opening must have a free area (after louver deduction) of:
• If directly through side wall: 1 square inch for each 4,000 Btuh of all ap-
pliances in the space.
• If through vertical ducts: 1 square inch for each 4,000 Btuh of all appli-
ances in the space.
• If through horizontal ducts: 1 square inch for each 2,000 Btuh of all ap-
pliances in the space.
Locating air openings
Follow all applicable codes and the appliance instruction manual (when
available) to size combustion air openings. Refer to Figure 2 when appliance
instructions are not available.
Estimating free area
When specific information on the free area of louvers is not available,
estimate free area as follows:
1. Wood louvers — free area = area times 0.25.
2. Metal louvers or grilles — free area = area times 0.60.
3. 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 air 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.
Figure 2 Locating combustion air/ventilation openings
Installing the burner/appliance in a space that does
not provide enough air for combustion and ventila-
tion can result 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.