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5. Determine appropriate length, cut, and connect tube.
6. Clamp tube to relief port connection.
E. Condensate Trap Freeze Protection
Refer to Condensate Drain Protection section for recommenda-
tions and procedures
F. Construct a Working Platform
Construct working platform where all required furnace clearances
are met. (See Fig. 3 and 11.)
CAUTION: The condensate trap MUST be installed
below furnace. See Fig. 5 for dimensions. The drain
connection to condensate trap must also be properly
sloped to an open drain.
NOTE: Combustion-air and vent pipes are restricted to a mini-
mum length of 5 ft. (See Table 7.)
NOTE: A 12-in. minimum offset pipe section is recommended
with short (5 to 8 ft) vent systems. This recommendation is to
reduce excessive condensate droplets from exiting the vent pipe.
(See Fig. 10 or 35.)
LOCATION
I. GENERAL
This furnace must
• be installed so the electrical components are protected from
water.
• not be installed directly on any combustible material other than
wood flooring (refer to INTRODUCTION).
• be located so combustion-air and vent pipe maximum lengths
are not exceeded. Refer to Table 7.
• be located where available electric power and gas supplies meet
specifications on the furnace rating plate.
• be attached to an air distribution system and be located as close
to the center of the distribution system as possible. Refer to Air
Ducts section.
• be provided with ample space for servicing and cleaning.
Always comply with minimum fire protection clearances
shown on the furnace rating plate.
This furnace may be located in a confined space without special
provisions for dilution or ventilation air.
LEVEL (0")
FRONT
TO
" MAX
1
⁄
2
UPFLOW OR DOWNFLOW
Fig. 13—Proper Condensate Drainage
NOTE: For proper furnace operation, install furnace so that it is
level or pitched forward within 1/2-in. to ensure proper condensate
drainage from secondary heat exchangers. (See Fig. 13.)
When a furnace is installed so that supply ducts carry air to areas
outside the space containing the furnace, return air must also be
handled by ducts sealed to furnace casing. The ducts terminate
outside the space containing the furnace to ensure there will not be
a negative pressure condition within equipment room or space.
FRONT
LEVEL (0")
TO
" MAX
1
⁄
2
HORIZONTAL
A93025
FRONT
BACK
Fig. 14—Prohibit Installation on Back
32°F MINIMUM INSTALLED
AMBIENT OR FREEZE
PROTECTION REQUIRED
Fig. 15—Freeze Protection
WARNING: Do not install furnace on its back. (See Fig.
14.) Safety control operation will be adversely affected.
Never connect return-air ducts to back of furnace. Failure
to follow this warning could result in fire, personal injury,
or death.
CAUTION: Do not operate this furnace during con-
struction. If the furnace is required, use clean outside air
free of chlorine and fluorine compounds for combustion
and ventilation. These compounds form acids that cor-
rode the heat exchangers. These compounds are found in
paneling and dry wall adhesives, paints, thinners, ma-
sonry cleaning materials, and many other materials.
CAUTION: If this furnace is installed in an uncondi-
tioned space where the ambient temperatures may be
32°F or lower, freeze protection measures must be taken.
(See Fig. 15.)
—12—
FRONT
B
A
C
K
A93043
A93058
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