Maytag H675NRRS Operations Instructions download pdf (Page 14)

Instructions for Installation (cont'd)

Locating the New Water Combustion Air and Ventilation

Heater (cont'd) for Appliances Located in

Unconfined Spaces

A WARNING Unconfined Space is a space whose volume is not less than

If this water heater will be used in beauty shops, 50 cubic feet per 1,000 Btu per hour of the aggregate input

barber shops, cleaning establishments, or self-set- rating ofaU appliancesinstalled in that space.Rooms com_

vice laundries with dry cleaning equipment, it is municating directlywith the space in which the appliances are

imperative that the water heater or water heaters instaUed,through openingsnot furnished with doors, are

be installed so that combustion and ventilation air

be taken from outside these areas. Refer to the considered apart of the unconfined space

"Locating The New Water Heater" section of this In unconfned spaces in buildings, infiltration may be ade-

manual and also the current edition of the National quate to provide airfor combustion, ventilation and dilution

Fuel Gas Code, ANSI Z223.1, also referred to as NFPA

154 for specifics provided concerning air required, of flue gases. However, in buildings of tight construction (for

example, weather stripping, heavily insulated, caulked, vapor

barrier, etc.), additional air may need to be provided using the

methods described in Combustion Air and Ventilation for

AWARNING Appliances Located in Confined Spaces, b.

INSTALLATIONS IN AREAS WHERE FLAMMABLE LIQ-

UIDS (VAPORS)ARELIKELYTO BEPRESENTOR STORED

(GARAGES, STORAGE, AND UTILITY AREAS, ETC): Combustion Air and Ventilation

Flammable liquids (such as gasoline, solvents, propane

for Located in

(LP) or butane, etc.), all of which emit flammable ppuances

vapors, may be improperly stored or used in such

Confined

C,, ,.

areas. The gas water heater pilot light or main burner Jpace

can ignite suchvapors. The resulting flashback and fire Confined Space is a space whose volume is less than 50 cubic

can cause death or serious burns to anyone in the

area, as well as property damage, feet per 1,000 Bm per hour of the aggregate input rating of all

If installation in such areas is your only option, then appliances installed in that space.

the installation must be accomplished in a way that a. ALLAIR FROM INSIDE BUILDINGS:

I the pilot flame and main burner flame are elevated

from the floor at least 18 inches. While this may (See Page 13 Figure 1, and Figure 2 below)

ireduce the chances of flammable vapors from a floor The confined space shall be provided with two permanent

spill being ignited, gasoline and other flammable sub- openings communicating directly with an additional

stances should never be stored or used in the same room(s) of sufficient volume so that the combined volume

i room or area containing a gas water heater or other

open flame or spark producing appliance, of all spaces meets the criteria for an unconfined space.

NOTE: Flammable vaporsmay be drawn by air currents The total input of all gas utifization equipment installed in

ifrom other areas of the structure to the appliance, the combined space shall be considered in making this

determination. Each opening shall have a minimum free

area of one square inch per 1,000 BTU per hour of the

total input rating of all gas utilization equipment in the

confined space, but not less than 100 square inches. One

opening shall commence within 12 inches of the top and

one commencing within 12 inches of the bottom of the

enclosure.

ENT

FURNACE OPENINGS

[ Figure 2 ] !. I

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Maytag H675NRRS Operations Instructions Page 14

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