Installation manual

66840/035-20003-001 Rev. B (1205)
16 Unitary Products Group
VENT PIPING ASSEMBLY
The final assembly procedure for the vent piping is as follows:
1. Cut piping to the proper length beginning at the furnace.
2. Deburr the piping inside and outside.
3. Dry-fit the vent piping assembly from the furnace to the termination
checking for proper fit support and slope. Piping should be sup-
ported with pipe hangers to prevent sagging. The maximum spac-
ing between hangers is 4 feet (1.22 m).
4. Assemble the vent piping from the furnace to the termination
securing the pipe connections with screws.
VENT CLEARANCES
IMPORTANT: The vent must be installed with the following minimum
clearances as shown in Figure 27 and must comply with state, regional,
and local codes and requirements.
FIGURE 23: Typical Sidewall Vent Application
FIGURE 24: Typical Sidewall Vent and Termination Configuration
FAN ASSISTED FURNACE
& WATER HEATER
FAN ASSISTED
FURNACES
VENT
PIPE
HOT
WATER
TANK
FURNACE
OPTIONAL
SIDEWALL
VENT SYSTEM
(field supplied)
EXTERIOR
VENT HOOD
VENT PIPE
FLUE
PIPE
BURNER
ACCESS
PANEL
CELLAR
WALL
OPTIONAL
SIDEWALL
VENT SYSTEM
(field supplied)
TOP
COVER
VENT
DAMPER
FIGURE 25: Typical Chimney Connections
FIGURE 26: Horizontal Air Inlet, Outlet and Chimney Connections
FURNACE
WATER
HEATER
CHIMNEY OR
GAS VENT
OPENING
OPENING
FURNACE
WATER
HEATER
OUTLET
AIR DUCT
INLET
AIR DUCT
TABLE 10: Horizontal Sidewall Venting Clearances
Horizontal Vent Length Ft. (m) with 4 Elbows
Heating Heating Heating Heating Furnace Furnace Pipe Size
Min. Vent Length Max. Vent Length
Input Input Output Output Airflow Airflow
Inches cm
BTU/H kW BTU/H kW CFM cm/m Feet meters Feet meters
75,000 22.0 60,000 17.6 1200 33.98 4 10.16 4.5 1.37 34.5 10.82
75,000 22.0 60,000 17.6 1600 45.31 4 10.16 4.5 1.37 34.5 10.82
100,000 29.5 80,000 23.9 1600 45.31 4 10.16 4.5 1.37 34.5 10.82