A.O. Smith 101 Series Instruction Manual page 28

4 inch concentric termination installation
INTAKE AIR CONNECTION
3 INCH PVC
3" x 3" x 4"
Y FITTING
VENT CONNECTION - 3 INCH PVC
VENT PIPE IS 2 1/2 INCH SDR-26 PIPE
SUPPLIED LENGTH 37 INCHES (94 cm)
MAXIMUM ALLOWABLE LENGTH 73 INCHES (185 cm)
MINIMUM ALLOWABLE LENGTH 25 INCHES (64 cm)
INTAKE AIR PIPE IS 4 INCH SDR-26 PIPE
SUPPLIED LENGTH 24 INCHES (60 cm)
MAXIMUM ALLOWABLE LENGTH 60 INCHES (152 cm)
MINIMUM ALLOWABLE LENGTH 12 INCHES (30 cm)
INTAKE AIR PIPE
Y FITTING ASSEMBLY
VENT PIPE ASSEMBLY
4 INCH CONCENTRIC TERMINATION KIT
FOUR PIECE KIT - FIELD ASSEMBLY REQUIRED
Assemble and install the 4 inch concentric termination. refer to
Figure 26, Figure 27 and Figure 28 for these instructions:
1. Cement the y fitting to the larger diameter intake air pipe.
2. Slide the intake air pipe and y fitting assembly from inside the
building through the hole cut for the termination in the roof
or sidewall. Ensure no foreign materials such as insulation
accumulate inside the assembly.
3. Secure the intake air y fitting assembly using field supplied
metal strapping or equivalent support materials.
4. On installations installed through the roof slide a field
supplied plumbing boot or roof flashing over the intake air y
fitting assembly and secure it to the roof.
5. Seal around the plumbing boot or roof flashing.
6. Cement the vent cap onto the vent pipe. Alternately a field-
supplied stainless steel screw may be used to secure the 2
components together when field disassembly is desired for
cleaning. A pilot hole must be drilled for the screw to prevent
damage/cracking of the vent cap and/or vent pipe.
7. install the vent cap/vent pipe assembly into the intake air y
fitting assembly, Ensure small diameter vent pipe is cemented
and bottomed in the y fitting.
8. Connect the intake air and vent piping from the water heater
to the 4 inch concentric termination using field supplied 4" x
3" reducer couplings as needed.
9. return to Direct Vent installation on page 23 to complete the
installation of the intake air and vent piping between the
concentric termination and the water heater.
INTAKE AIR PIPE
VENT PIPE
VENT CAP
VENT CAP
figure 26
COMBUSTION
AIR
ROOF FLASHING
(field supplied)
VENT
PIPE
4 INCH CONCENTRIC TERMINATION
VERTICAL INSTALLATION
NOTE: SECURING STRAP MUST BE
FIELD INSTALLED TO PREVENT
MOVEMENT OF TERMINATION KIT
IN SIDEWALL.
VENT
(field supplied)
PIPE
INTAKE
AIR PIPE
4 INCH CONCENTRIC TERMINATION
SIDEWALL INSTALLATION
28
VENT MAINTAIN 12" (30 cm)
18" (45 cm) FOR CANADA
MINIMUM CLEARANCE
ABOVE HIGHEST ANTICIPATED
SNOW LEVEL. MAXIMUM OF
24" (60 cm) ABOVE ROOF.
STRAP
(field supplied)
NOTE: SECURING STRAP
MUST BE FIELD INSTALLED
TO PREVENT MOVEMENT
OF TERMINATION KIT
INTAKE
AIR PIPE
figure 27
COMBUSTION
STRAP
figure 28
AIR
VENT
1 INCH
MAXIMUM