Connections To The Blower And Air Duct - A.O. Smith 300 Series Installation And Operating Manual

Connections To The Blower And Air Duct

1. The vent piping connects into the rubber coupling
located on the top of the blower assembly. This
coupling includes gear clamps to connect the venting
to the blower. See Figure 48.
Important: These connections must be properly seated
and tightened to prevent the leakage of flue gases into the
area. See Figure 47 through Figure 49.
WARNING
Breathing Hazard - Carbon Monoxide Gas
Vent pipe connections to the blower must be
properly seated and tightened to prevent the
leakage of flue gases into the area.
Breathing carbon monoxide can cause brain damage or death.
Always read and understand instruction manual.
Note: Polypropylene vent systems require separate
adaptor (field supplied).
2. Before installing clean and lightly sand the end of the
ABS/PVC/CPVC plastic vent piping that will connect
into the rubber coupling. For polypropylene vent
systems follow manufacturer's instructions.
3. Loosen the upper clamp on the rubber coupling and
insert the sanded end of the vent piping a full 1-1/4" .
Do not use glue or sealant in the rubber coupling.
Check that there is no stress on the connection or the
vent piping that may be caused by twisting or bending.
4. Tighten the upper clamp so that the vent piping is
firmly secured in the coupling and is gas tight. Do not
over tighten or cause distortion of any of the parts.
Ensure the bottom of the rubber coupling is firmly
seated on the blower outlet and that the lower gear
clamp is also secure. Check to ensure there is no
distortion or movement of the clamped assembly once
it is completed.
CAUTION
Property Damage Hazard
• Do not overtighten the top and bottom gear clamps of the
rubber coupling.
• Do not apply solvent cement or silicone to the rubber
coupling connection.
100304526_2000545240 _Rev. 01
Figure 47 shows the configuration for heaters direct
connected to 2" venting.
2" VENT
PIPE
FITTING
"A"
RESTRICTIVE
SCREEN (IF
APPLICABLE)
2" VENT PIPE,
12" LENGTH
RECOMMENDED
2" RUBBER
COUPLING
( SEE KIT)
BLOWER
FITTING "A" MAY BE A COUPLING AS SHOWN, OR AN ELBOW AS
SUITABLE FOR THE INSTALLATION.
Figure 48 shows heaters having 3" direct connection to
the blower.
3" VENT
PIPE
FITTING "A"
RESTRICTIVE
SCREEN (IF
APPLICABLE)
3" 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 49 shows the configuration for heaters connected
to 4" venting.
4" VENT
PIPE
3"-4"
ADAPTER
3" VENT PIPE, 3"
MAX LENGTH
3" RUBBER
COUPLING
BLOWER
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RESTRICTIVE
SCREEN (IF
APPLICABLE)
SCREW
ADAPTER
( SEE KIT)
3" PIPE
(SUPPLIED)
AIR DUCT
ADAPTER
Figure 47.
3" INLET
PIPE
SCREW
RESTRICTIVE
SCREEN (IF
APPLICABLE)
AIR DUCT
ADAPTER
Figure 48.
4" INLET PIPE
ADAPTER
Figure 49.
2" INLET
PIPE
2"-3"
3"-4"
3"
PIPE
AIR DUCT
ADAPTER
41