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INTAKE AIR CONNECTIONINTAKE AIR CONNECTION
The intake air connection has a screen and a hose barb installed at the factory, see Figure below.
The intake air connection screen is installed to prevent debris from entering the Combustion Blower and/or Burner. This screen is left in
place when the water heater is installed in a Power Vent conguration but must be removed before connecting the intake air piping on
Direct Vent installations. Once the intake air pipe is installed the screen, if not removed, would be hidden from view and may become
clogged with debris over time. This can cause poor combustion and Blocked Air Intake fault conditions and Control System lock outs.
Ensure this screen has been removed on all Direct Vent installations if experiencing Blocked Air Intake fault conditions.
Six-Inch Coupling - Factory Installed
Intake Air Screen
(Remove for Direct Vent)
Blocked Air Intake
Pressure Port
Figure 18. AIR INTAKE SCREEN
Service Notes:
• Plastic debris left on the edges of intake air pipe sections after cutting must be removed on Direct Vent installations. This debris can
collect inside and clog the Burner which can cause poor combustion, sooting, rough starting, rough operation and Ignition Failure
fault conditions and Control System lock outs. The Burner is a radial design that can trap debris. See Figure 4 (page 7).
• Exceeding the equivalent length limitations for the vent piping will cause Blocked Exhaust fault conditions and Control System lock
outs.
• Exceeding the equivalent length limitations for the intake air piping will cause Blocked Air Intake fault conditions and Control System
lock outs.
• Exceeding the maximum number of elbows allowed for the intake air and/or vent piping will also cause Blocked Air Intake and
Blocked Exhaust fault conditions and Control System lock outs.
• Using smaller intake air and/or vent pipe than required for the installed equivalent length will also cause Blocked Air Intake and
Blocked Exhaust fault conditions and Control System lock outs.
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