State GPO 69 700OE User Manual download pdf (Page 5)

CHEMICAL VAPOR CORROSION

Water heater corrosion and component failure can be caused by

the heating and breakdown of airborne chemical vapors. Spray can

propellants, cleaning solvents, refrigerator and air conditioning refrigerants,

swimming pool chemicals, calcium and sodium chlorides, waxes, and

process chemicals are typical compounds which are potentially corrosive.

These materials are corrosive at very low concentration levels with little

or no odor to reveal their presence.

Products of this sort should not be stored near the heater. Also, air which

is brought in contact with the water heater should not contain any of these

chemicals. If necessary, uncontaminated air should be obtained from

remote or outside sources.

UNCONFINED SPACES (Building Construction)

NOTE: An unconned space is dened as a space whose volume is not

less than 50 ft

per 1000 BTUH (4.83m

per kW) of total input of

all fuel burning appliances installed in that space. The unconned

space may be thought of as extending to all areas which cannot

be separated by a door or door(s). All other spaces not tting this

description, should be thought of as conned space.

1. In unconned spaces in buildings of conventional frame, brick or

stone construction, inltration will normally supply an adequate

amount of air for combustion and ventilation.

2. If the unconned space is within a building of tight construction, eg.

weather stripping, heavy insulation, caulking, vapor barrier, ect.,

air inltration may be insufcient to support proper combustion and

ventilation, air shall be obtained from outdoors or from spaces freely

communicating with the outdoors.

• Follow instructions under Part 2 of Confined Spaces (Room

Construction)

CONFINED SPACES (Room Construction)

1. All air from inside building (conventionally constructed buildings only):

The conned space shall be provided with two permanent openings,

one within 12" (305 mm) of the ceiling and one within 12" (305 mm) of

the oor, g. 4.

FIGURE 4.

• Each opening shall have a free area of not less than one square

inch per 1,000 Btu per hour (140 square inches per gallon of oil

consumed per hour) of the total input rating of all appliances in the

enclosure, freely communicating with the interior areas having in

turn adequate inltration from the outside. In all cases, each opening

shall not have a free area of less than 100 square inches.

2. All Air From Outdoors: The conned space shall be provided with two

permanent openings, one in or within 12" of the top of the enclosure

and one in or within 12" of the bottom. The openings shall communicate

directly, or by means of ducts, with outdoors or such spaces that freely

communicate with outdoors.

• If the appliance room is located against an outside wall and the air

openings communicate directly with the outdoors, each opening

shall have a free area of not less than one square inch per 4,000

Btu per hour (35 square inches per gallon of oil consumed per hour)

of the total input rating of all appliances in the enclosure.

• Try to make hot water and oil piping as short as possible.

• Insulate hot and cold water piping where heat loss and

condensation may be a problem.

CLEARANCES

The heater has minimum clearances to combustible material, on a non-

combustible oor of: 6 inches (152 mm) from the sides and rear, 24

inches (610 mm) from the front, and 18 inches (457 mm) from the vent

connector. These clearances are, as shown in g. 3A to prevent possible

re hazard conditions.

At least 24" (610 mm) of top clearances are recommended for vertical

vent installation.

Allow sufcient room at rear of heater for servicing of T&P relief valve.

At least 24" (610 mm) should be provided at the front of the unit for

proper servicing.

Units which are to be installed on combustible ooring must be supported

by a full layer of hollow concrete blocks, g. 3, from 8" (203 mm) to

12" (305 mm) thick and extending 12" (305 mm) minimum beyond the

heater in all directions. The concrete blocks must provide an unbroken

concrete surface under the heater, with the hollows running continuous

and horizontally. A 3/16" (4.8 mm) steel plate must cover the concrete

blocks, see Fig. 3.

PROPER INSTALLATION ON COMBUSTIBLE FLOORING

FIGURE 3.

NOTE: If electrical conduits run under the oor of the proposed heater

location, insulate the oor as recommended above.

PROPER INSTALLATION CLEARANCES FOR TWO DIFFERENT

VENTING SYSTEMS

FIGURE 3A.

* HOT WATER OUTLET LOCATION AT FRONT OF HEATER

• FACTORY FURNISHED HEATER MANIFOLD KITS (OPTIONAL)

ARE DESIGNED FOR 10" (254 mm) SPACING BETWEEN SIDES

OF ADJACENT UNITS.

COMBUSTION AND VENTILATION AIR

GENERAL

The water heater area should have sufcient air for satisfactory combustion

of oil, and proper venting and of safe ambient temperature.

When a heater is installed in an area where exhaust or ventilating fans may

create unsatisfactory combustion or venting, approved provisions must be

made to overcome the problem, see NFPA Standard No. 31, Chapter 1.

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State GPO 69 700OE User Manual Page 5

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