Sears 9MPD, N9MP2 manual Combustion & Ventilation Air For Single Pipe Installation, Condensate Trap

Horizontal Furnace Installation

This furnace can be installed horizontally in an attic, basement, crawl space, alcove, or suspended from a ceiling in a basement or utility room. See Figure 4. Do not install furnace on its back or in

the reverse airflow positions as safety control operation will be ad- versely affected.

_ _!'i [ Typical Horizontal Installation

Inlet Pipe (not used on Single Pipe model)

Vent

C_

Condensate

Trap

25-23-34

NOTE: 6" bottom clearancerequired for condensatetrap.

3. Combustion & Ventilation Air

For Single Pipe Installation

If the furnace is to be suspended from the floor joists in a crawl space or the rafters in an attic, it is necessary to use steel pipe straps or an angle iron frame to rigidly attach the furnace to pre- vent movement. These straps should be attached to the furnace with sheet metal screws and to the rafters or joists with bolts. The preferred method is to use an angle iron frame bolted to the rafters or joists. (Take caution to allow door panels to be removed for maintenance)

If the furnace is to be installed in a crawl space, consult local

codes. A suitable concrete pad or blocks are recommended for crawl space installation on the ground.

NOTE: 6" bottom clearance required for condensate trap.

Thirty (30) inches between the front of the furnace and adjacent construction or other appliances MUST be maintained for service clearance.

Keep all insulating materials clear from Iouvered door. Insulating materials may be combustible.

The horizontal furnaces may be installed directly on combustible wood flooring or supports as long as all required furnace clear- ances are met. See Figure 4.

This furnace MUST NOT be installed directly on carpeting or tile

or other combustible material other than wood flooring or sup- ports.

For horizontal installation over a finished living space. A field fab- ricated auxiliary drain pan with drain pipe is required to prevent damage by overflow due to blocked condensate drain.

2.Connect ducts or openings directly to outside.

3.When screens are used to cover openings, they MUST be no less than 1/4" mesh.

CARBON MONOXIDE POISONING HAZARD

Failure to provide adequate combustion and ventilation

air can result in death and/or personal injury.

Use methods described here to provide combustion and

ventilation air.

Furnaces require ventilation openings to provide sufficient air for proper combustion and ventilation of flue gases. All duct or open-

ings for supplying combustion and ventilation air must comply

with National Fuel Gas Code, NFPA54/ANSI Z223.1, 2001 (or current edition) and applicable provisions of local building codes.

This furnace can NOT be common vented or connected to any type B, BW or L vent or vent connector, nor to any portion of a fac- tory-built or masonry chimney. If this furnace is replacing a pre-

viously common-vented furnace, it may be necessary to resize the existing vent and chimney to prevent oversizing problems for

the other remaining appliance(s). See "Venting and Combustion Air Check"in this section, This furnace MUST be vented to the

outside.

Air Openings and ConnectingDucts

1.Total input rating for all non direct vent gas appliances MUST be considered when determining free area of open- ings.

4.The minimum dimension of rectangular air ducts MUST NOT be less than 3".

5.When sizing grille or louver, use the free area of opening. If

free area is NOT stamped or marked on grill or louver, as- sume a 20% free area for wood and 60% for metal.

Confined Space Installation

NOTE: A confined space is defined as an area with less than 50 cubic feet per 1,000 BTUH input rating for all gas appliances installed in the area.

Requirements

Provide confined space with sufficient air for proper com- bustion and ventilation of flue gases using horizontal or ver- tical ducts or openings.

Figure 5 illustrate how to provide combustion and ventila- tion air. A minimum of two permanent openings, one inlet and one outlet, are required.

One opening MUST be within 12" of the floor and the se- cond opening within 12" of the ceiling.

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