11
2. For each hole, install nut on bolt and then install bolt and
nut in hole. (Install flat washer if desired.)
3. Install another nut on other side of furnace base. (Install
flat washer if desired.)
4. Adjust outside nut to provide desired height, and tighten
inside nut to secure arrangement.
NOTE: Bottom closure must be used when leveling legs are
used. See Bottom Closure Panel section.
Step 2 —Installation
1. Construct hole in floor per dimensions specified in Fig. 13
and Table 1.
2. Construct plenum to dimensions specified in Fig. 13 and
Table 1.
PLENUM
OPENING
C
A
B
D
FLOOR
OPENING
A96283
Fig. 13 --- Floor and Plenum Opening Dimensions
TABLE 1—OPENING DIMENSIONS (IN.)
FURNACE
CASING
WIDTH
PLENUM OPENING
FLOOR OPENING
A
B C D
17--- 1/2 16 24--- 1/8 16--- 5/8 24--- 3/4
21 19---1/2 24---1/8 20--- 1/8 24--- 3/4
24--- 1/2 23 24--- 1/8 23--- 5/8 24--- 3/4
Step 3 —Air Ducts
GENERAL REQUIREMENTS
The duct system should be designed and sized according to
accepted national standards such as those published by: Air
Conditioning Contractors Association (ACCA), Sheet Metal and
Air Conditioning Contractors National Association (SMACNA)
or American Society of Heating, Refrigerating and Air
Conditioning Engineers (ASHRAE) or consult The Air Systems
Design Guidelines reference tables available from your local
distributor. The duct system should be sized to handle the
required system design CFM at the design static pressure.
When a furnace is installed so that the supply ducts carry air
circulated by the furnace to areas outside the space containing the
furnace, the return air must also be handled by a duct(s) sealed to
the furnace casing and terminating outside the space containing
the furnace.
Secure ductwork with proper fasteners for type of ductwork used.
Seal supply-- and return--duct connections to furnace with code
approved tape or duct sealer.
Flexible connections should be used between ductwork and
furnace to prevent transmission of vibration. Ductwork passing
through unconditioned space should be insulated to enhance
system performance. When air conditioning is used, a vapor
barrier is recommended.
Maintain a 1 -- in. clearance from combustible materials to supply
air ductwork for a distance of 36 in. horizontally from the
furnace. See NFPA 90B or local code for further requirements.
For a furnace not equipped with a cooling coil, the outlet duct
shall be provided with a removable access panel. This opening
shall be accessible when the furnace is installed and shall be of
such a size that the heat exchanger can be viewed for possible
openings using light assistance or a probe can be inserted for
sampling the air stream. The cover attachment shall prevent leaks.
DUCTWORK ACOUSTICAL TREA
TMENT
Metal duct systems that do not have a 90 degree elbow and 10 ft
of main duct to the first branch take-- off may require internal
acoustical lining. As an alternative, fibrous ductwork may be used
if constructed and installed in accordance with the latest edition of
SMACNA construction standard on fibrous glass ducts. Both
acoustical lining and fibrous ductwork shall comply with NFPA
90B as tested by UL Standard 181 for Class 1 Rigid air ducts.
SUPPLY AIR
CONNECTIONS
Connect supply--air duct to 3/4--in. flange on furnace supply -- air
outlet. The supply -- air duct attachment must ONLY be connected
to furnace supply--/outlet--air duct flanges or air conditioning coil
casing (when used). DO NOT cut main furnace casing to attach
supply side air duct, humidifier, or other accessories. All
accessories MUST be connected external to furnace main casing.
RETURN AIR
CONNECTIONS
FIRE HAZARD
Failure to follow this warning could result in fire,
personal injury, or death.
Never connect return-- air ducts to the back of the
furnace.
!
WARNING
The return--air duct must be connected to bottom, sides (left or
right), or a combination of bottom and side(s) of main furnace
casing. Bypass humidifier may be attached into unused side
return air portion of the furnace casing. DO NOT connect any
portion of return-- air duct to back of furnace casing.
Step 4 —Filter Arrangement
FIRE, CARBON MONOXIDE AND POISONING
HAZARD
Failure to follow this warning could result in fire,
personal injury or death.
Never operate unit without a filter or with filter access
door removed.
!
WARNING
The air filter arrangement will vary due to return air configuration
and filter type. The filter may be installed in an external
Filter/Media cabinet (if provided) or the furnace blower
compartment. Factory supplied washable filters are shipped in the
blower compartment.
If a factory--supplied external Filter/Media cabinet is provided,
instructions for its application, assembly, and installation are
58UVB
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