Operating instructions

7. The floor supporting boiler must be non-combustible. If it is combustible, place the boiler on a factory-approved combustible floor base.
We use a 2-in. cladite™ pad as a combustible floor base. These are available from your local supplier. Use a minimum 24-in. X 30-in. pad
for 2-5 section boilers and a minimum 30-in. X 30-in. pad for 6-7 section boilers. The boiler must be centered on combustible floor base.
8. The boiler shall be installed such that the automatic gas ignition system components are protected from water (dripping, spraying, rain , etc.)
during appliance operation and service (circulator replacement, control replacement, etc.).
FRESH AIR FOR COMBUSTION
Provision for combustion and ventilation air must be in accordance with Section 5.3, Air for Combustion and Ventilation, of the NFGC, ANSI
Z223.1-1992, or applicable provisions of local building codes.
Canadian installations must be installed in accordance with NSCNGPIC and all authorities having jurisdiction.
WARNING: Be sure to provide enough fresh air for combustion. Enough air ensures proper combustion and
ASSURES THAT NO HAZARD WILL DEVELOP DUE TO LACK OF OXYGEN.
CAUTION: Air for combustion must not be contaminated by halogen compounds, which include fluoride, chloride,
bromide, and iodide. These elements are found in aerosol sprays, detergents, bleaches, cleaning solvents, salts, air
fresheners, and other household products.
Excessive exposure to contaminated combustion air will result in safety and performance related problems.
CAUTION: If a fireplace or a kitchen or bathroom exhaust fan is used, an outside air intake should be installed. These
devices rob the boiler and water heater of combustion air.
Enough fresh air must be provided to assure proper combustion. The fire in the boiler uses oxygen. It must have a continuous supply. The air in
a house contains only enough oxygen to supply the burner for a short time. Outside air must enter the house to replace that used by the burner.
The exact fresh air requirements depend on whether the boiler is located in an unconfined or confined space.
PROCEDURE 1—BOILER LOCATED IN UNCONFINED SPACE
An unconfined space is defined as a space whose volume is not less than 50 cu ft per 1000 Btuh of total input rating of all appliances installed
in that space.
If boiler is in an open area (unpartitioned basement) in a conventional house, air that leaks through cracks around doors and windows will usually
be adequate to provide air for combustion. The doors should not fit tightly. Do not caulk cracks around windows.
PROCEDURE 2—BOILER LOCATED IN CONFINED SPACE
A. All Air From Inside Building
The confined space shall be provided with 2 permanent openings communicating directly with an additional room(s) of sufficient volume so that
the combined volume of all spaces meets the criteria for an unconfined space. The total input of all gas utilization equipment installed in the
combined space shall be considered in making this determination. Each opening shall have a minimum free area of 1 sq in. per 1000 Btuh of total
input rating for all gas utilization equipment in the confined space, but not less than 100 sq in. One opening shall be within 12 in. of the top and
1 within 12 in. of the bottom of the enclosure.
B. All Air From Outdoors
The confined space shall be provided with 2 permanent openings, 1 commencing within 12 in. of the top and 1 commencing within 12 in. of the
bottom of the enclosure. The openings shall communicate directly, or by ducts, with the outdoors or spaces (crawl or attic) that freely communicate
with the outdoors.
1. When directly communicating with the outdoors, each opening shall have a minimum free area of 1 sq in. per 4000 Btuh of total input rating
for all equipment in the enclosure.
2. When communicating with the outdoors through vertical ducts, each opening shall have a minimum free area of 1 sq in. per 4000 Btuh of
total input rating for all equipment in the enclosure.
3. When communicating with the outdoors through horizontal ducts, each opening shall have a minimum free area of 1 sq in. per 2000 Btuh
of total input rating for all equipment in the enclosure.
4. When ducts are used, they shall be of the same cross-sectional area as the free area of the openings to which they connect. The minimum
dimension of rectangular air ducts shall not be less than 3 in.
EXCEPTION—If this INDUCED DRAFT boiler is the ONE AND ONLY gas-fired appliance in the confined space, then each required ventilation
opening as determined above may be reduced by 1/2.
For Example:
VENTILATION OPENING REQUIREMENT
All Air from Inside Building 1 sq in. per 2000 Btuh, but not less than 50 sq in.
All Air from Outside Building
Direct Communication 1 sq in. per 8000 Btuh
Vertical Ducts 1 sq in. per 8000 Btuh
Horizontal Ducts 1 sq in. per 4000 Btuh
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