34
Servicing should only be performed by a Qualified Service Technician
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
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.
INTAKE AIR CONNECTION DETAIL
4” x 3” REDUCER
COUPLING - FACTORY INSTALLED
AIR INTAKE SCREEN
(remove for Direct Vent)
INTAKE AIR CONNECTION DETAIL
3 INCH INTAKE AIR CONNECTION
FACTORY INSTALLED
AIR INTAKE SCREEN
(remove for Direct Vent)
BTH 120 - 250 Models
BTH 300 - 500 Models
