ULTRA HIGH EFFICIENCY POWER VENT/POWER DIRECT VENT - SERVICE MANUAL
BURNER
The images below show a complete blower/burner assembly removed along with a top view of the water heater with the blower removed.
Service Notes - Burner (Flame Sensor)
The burner installed in the water heater is a radial fire burner. Radial fire burners can trap debris that enter the blower. Be sure to thoroughly clean the edges of intake air pipe sections after cutting during the installation. If this is not done plastic shavings can collect inside the burner and lead to rough operation and/or ignition failure.
The burner should be removed and inspected whenever servicing for rough operation or ignition failure problems. Burner removal requires removal of the blower. Blower removal requires
The flame sensor will accumulate corrosion (rust etc) over time. This will reduce flame sensing current. This is the most common cause of “Ignition Failure” lock outs. The flame sensor should cleaned when servicing due to ignition failure and as a routine maintenance procedure. Fine grade steel wool is recommended for cleaning the flame sensor; do not use coarse abrasives such as sand paper.
Blower Adapter
Igniter |
Blower VFD |
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Assembly | Flame Sensor |
Radial Fire Burner
Top View Water Heater - Blower Removed 
Burner Ground Wire | Blower Adapter |
Burner must be grounded for flame sensing current to be established. See Service Notes - Electrical page 8
Burner View Port
Blower removal requires 8
Technical Literature Department | 11 of 52 | Ashland City, TN © 2008 |
Servicing should only be performed by a Qualified Service Agent |
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