Installation manual

035-19599-001 Rev. A (1103)
Unitary Products Group 15
VENT SYSTEM
This furnace is certified to be installed with one of two possible vent
configurations.
1. Horizontal vent system. This vent system can be installed com-
pletely horizontal or combinations of horizontal, vertical, or offset
using elbows.
2. Vertical vent system. This vent system can be installed completely
vertical or a combination of horizontal, vertical, or offset using
elbows.
HORIZONTAL VENT APPLICATIONS AND
TERMINATION
When selecting the location for a horizontal combustion air / vent termi-
nation, the following should be considered:
1. Observe all clearances listed in vent clearances in these instruc-
tions.
2. Termination should be positioned where vent vapors will not dam-
age plants or shrubs or air conditioning equipment.
3. Termination should be located where it will not be affected by wind
gusts, light snow, airborne leaves or allow recirculation of flue
gases.
4. Termination should be located where it will not be damaged or
exposed to flying stones, balls, etc.
5. Termination should be positioned where vent vapors are not objec-
tionable.
6. Horizontal portions of the vent system must slope upwards and be
supported to prevent sagging. The vent system may be supported
by the use of clamps or hangers secured to a permanent part of
the structure every 4 ft. (1.22 m).
7. A vent drain is required when vent passes through any uncondi-
tioned space such as an attic or crawl space in order to prevent
the accumulation of excess condensate in the inducer motor dur-
ing operational cycles, refer to Figure 16 and “VENT DRAIN”.
• Sealed combustion air systems must be installed so the vent
and the combustion air pipes terminate in the same atmo-
spheric zone. Refer to Figures 18, 19, 20 & 23.
VENT DRAIN
To install the vent drain, complete the following steps:
1. Place a tee of the proper diameter for the vent system being
installed (2” (51 mm) or 3” (76 mm)) in the horizontal run closest to
the furnace.
2. Place a reducer bushing of proper diameter in the stem portion of
the tee. The recommended size for the reducer is 5/8".
3. Place a piece of 5/8” (16 mm) diameter pipe that has a minimum
length of 3” (76 mm) long into the reducer to serve as a nipple.
IMPORTANT: Tee, reducer and nipple must be properly cemented
together using the appropriate method and materials specified in
“COMBUSTION AIR AND VENT PIPING ASSEMBLY” in these instruc-
tions.
4. Connect a piece of flexible drain tubing such as EPDM rubber or
PVC to the nipple.
5. Loop the drain tubing to provide a trap.
6. Connect the discharge end of the drain tube to the condensate
disposal system externally to the furnace.
FIGURE 17: Horizontal Vent Drain
FIGURE 18: Termination Configuration - 1 Pipe
FIGURE 19: Termination Configuration - 2 Pipe
NEUTRALS
EAC
COOL
HEAT
HUM
PARK
PARK
L1
XFMR
YWRGC
3.00” MINIMUM
LOOP DIAMENTER
ATTACH THIS END
TO CONDENSATE
DRAIN SYSTEM
12” min
12” min
MAINTAIN 12” MINIMUM CLEARANCE
ABOVE HGIHEST ANTICIPATED SNOW
LEVEL. MAXIMUM 24” ABOVE ROOF.
MAINTAIN 12”
MINIMUM
ABOVE HIGHEST
ANTICIPATED
SNOW LEVEL
12” VERTICAL SEPARATION
BETWEEN COMBUSTION AIR
AND VENT
12” MINIMUM
BELOW OVERHANG
12” SEPARATION
BETWEEN BOTTOM
OF COMBUSTION
AIR PIPE AND
BOTTOM OF VENT
MAINTAIN 12”
MINMUM CLEARANCE
ABOVE HIGHEST
ANTICIPATED SNOW
LEVEL OR GRADE,
WHICHEVER IS
HIGHER
CLEARANCE