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II. GENERAL INSTRUCTIONS - READ BEFORE START OF INSTALLATION
1. The heating output capacity of the furnace proposed for installation should be based on a heat loss
calculation made according to the manuals provided by the Air Conditioning Contractors of America
(ACCA) or the American Society of Heating, Refrigeration and Air Conditioning Engineers, Inc.
(ASHRAE).
2. All local codes and/or regulations take precedence over the instructions in this manual and should be
followed accordingly. In the absence of local codes, installation must conform with these instructions and
regulations of the National Fire Protection Association, and to the provisions of the National Electrical
Code (ANSI/NFPA 70-1999 or latest edition).
3. The installed furnace must be level and positioned in a central location with respect to outlet registers.
It should be located near the chimney to minimize any horizontal run of flue pipe, which may be required.
4. A furnace installed in a residential garage must be installed so the burner and ignition source are
located higher than 18 inches above the floor. The furnace must also be located or protected to avoid
physical damage by vehicles.
χWARNING: This furnace is not to be used as a construction heater.
5. Listed below are definitions of "COMBUSTIBLE MATERIAL" and "NON-COMBUSTIBLE MATERIAL."
Combustible Material: is made of or surfaced with wood, compressed paper, plant fibers, plastics, or
other material that will ignite and burn, whether flame resistant or not.
Non-Combustible Material: is material that is not capable of being ignited and burned. Such materials
consist entirely of, or a combination of, steel, iron, brick, tile, concrete, slate, or glass.
Table 1: MINIMUM CLEARANCES TO COMBUSTIBLE MATERIALS
TYPE OF
UNIT
MODEL NO.
1
FROM
SIDES OF
FURNACE
FRONT
TOP &
SIDES OF
PLENUM
FROM THE
FLUE/VENT
REAR
Highboy
OH6FA072D*** 0” Note
1
1” 7” 0”
Highboy
OH8FA119D*** 0” Note
2
1” 8” 0”
Note:
1
OH6 front clearance 6” for Closet, 24” for Alcove.
2
OH8 front clearance 8” for Closet, 24” for Alcove.
The minimum clearances listed in the preceding table are for fire protection. Clearance for servicing the
front of the furnace should be at least 24 inches.
NOTE: The OH6 & OH8 furnaces are approved for closet installation. If the OH6 is installed in a closet, it
requires two openings in the closet door for combustion air, each having a minimum area of 162 sq.
inches. The OH8 requires two openings in the closet door, each having a minimum area of 181 sq.
inches. This free area intentionally exceeds the recommended minimum free area of 1 square inch per
1000 BTUH of input rate.