Intake Air Connection - State Water Heaters 60120-100250 Service Handbook

INTAKE 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 configuration 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.
AIR INTAKE SCREEN
(remove for Direct Vent)
3 INCH INTAKE AIR CONNECTION
FACTORY INSTALLED
INTAKE AIR CONNECTION DETAIL
SUF 60120 - 100250 Models
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 "Combustion Blower & Burner Assembly"
section on Page 4.
• 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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AIR INTAKE SCREEN
Servicing should only be performed by a Qualified Service Technician
AIR INTAKE SCREEN
(remove for Direct Vent)
4" x 3" REDUCER
COUPLING - FACTORY INSTALLED
INTAKE AIR CONNECTION DETAIL
SUF 119300 - 119500 Models