A.O. Smith BPD-80 Series Installation And Operating Manual page 40

Figure 43 shows heaters having 3" direct connection to
the blower.
3" CPVC
VENT PIPE
FITTING "A"
RESTRICTIVE
SCREEN (IF
APPLICABLE)
3" CPVC
VENT PIPE,
12" LENGTH
RECOMMENDED
3" RUBBER
COUPLING
(SUPPLIED)
BLOWER
FITTING "A" MAY BE A COUPLING AS SHOWN, OR AN ELBOW AS
SUITABLE FOR THE INSTALLATION.
Figure 43.
Figure 44 shows the configuration for heaters connected
to 4" venting.
4" CPVC
VENT PIPE
3"-4"
ADAPTER
3" CPVC VENT PIPE,
3" MAX LENGTH
3" RUBBER
COUPLING
BLOWER
Figure 44.
40
3" INLET
PIPE
SCREW
RESTRICTIVE
SCREEN (IF
APPLICABLE)
AIR DUCT
ADAPTER
4" INLET PIPE
3"-4"
ADAPTER
3"
PIPE
AIR DUCT
ADAPTER
The restrictive screen (see Figure 37) and the air intake
piping should be secured in place with a screw. To prevent
damage to the equipment, first position the restrictive
screen in place, then drill a pilot hole suitable for the screw
being used. The screen must be fully seated and the screw
should not interfere with the airflow through it. Once the
pilot hole is drilled, place the intake pipe in position and
secure in place using the screw (see Figure 43 through
Figure 44). Do not use glue to secure this joint in order to
allow the screen to be removed for cleaning. The screen
in the exhaust piping should be located close to the blower
and all exhaust piping joints should be glued.
If the installation requires restrictive screens (see
Figure 37) the restrictive screens should be installed near
the blower as shown in Figure 43 through Figure 44. If
the restrictive screens are installed near the blower, it
is recommended that debris screens (see Figure 37) be
installed at the terminations.
100299634_2000545244_ Rev. A