14
Servicing should only be performed by a Qualified Service Agent
Combustion blower and burner removal
The Combustion Blower and Burner Assembly must be removed to inspect the Burner and to service the Flame
Sensor and Igniter. This section will provide instructions on how to remove and inspect these components.
Service Notes:
• There are four 1/8 inch hex head machine screws that hold the Combustion Blower to the Blower
Flange on the Burner Adapter. There are four 1/2 inch threaded studs and nuts that hold the Burner
Adapter to the Heat Exchanger Flange on top of the water heater storage tank. There are four 5/16 inch
hex head machine screws that hold the Burner to the Burner Adapter.
• All three of these connections have gaskets. The Combustion Blower gasket is an orange silicone
gasket placed between the Combustion Blower outlet and the Blower Flange on top of the Burner
Adapter. There is a white fiber gasket between the Burner Adapter and the Heat Exchanger Flange on
top of the water heater. There is also a white fiber gasket between the Burner and the Burner Adapter.
See the exploded view of the Combustion Blower & Burner Assembly on page 9 and Figure 13 below.
• Before removing the Combustion Blower and/or Burner Assembly ensure there are new gaskets on
hand for all these connections. Call the toll free phone number on the back cover of this manual to order
these parts. Have the complete Model, Series and Serial number (located on the water heater's rating
label) for the water heater being serviced on hand before calling.
• do not place any screws, studs, nuts, parts or tools on top of the water heater when removing the
Combustion Blower and/or Burner Assembly. Place these and any other loose objects in a safe location
during these procedure. Small parts and tools can easily fall down into the heat exchanger during these
procedures and may be extremely difficult or to retrieve. See Figure 6 on page 10.
• Ensure the Burner ground wire is secured properly when finished. The Burner must be grounded for the
control system to prove flame. Failure to ground the Burner properly will cause an
Ignition Failure
fault
condition and Control System lock out, see Flame Sensing operation on page 18.
ORANGE SILICONE GASKET BETWEEN THE COMBUSTION
BLOWER AND THE BLOWER FLANGE ON THE BURNER ADAPTER
WHITE FIBER GASKET BETWEEN THE BURNER ADAPTER AND THE
THE HEAT EXCHANGER FLANGE ON TOP OF THE STORAGE TANK
Figure 13
Combustion blower removal
1.
If the water heater is in a heating cycle lower the operating Set Point to end the cycle, see Temperatures
on page 49.
2.
Turn off power to the water heater at the water heater's on/off switch.
3.
Turn off the circuit breaker that serves the water heater or unplug the water heater appliance cord from
the 120 VAC wall outlet if so equipped.
4.
disconnect the 3 pin plug from the Combustion Blower assembly, see Figure 7 on page 11.
5.
disconnect the 5 pin plug from the Combustion Blower assembly, see Figure 7 on page 11.
