507388-03
Issue 2110
Page 15 of 19
6. Disconnect the red and blue wires at the gas valve.
7. Refer to Figure 9. Remove the two screws on the
burner assembly that secure it to the mounting
brackets. The mounting brackets contain pins to locate
the assembly and hold it in place after the screws are
removed. The mounting brackets are hidden until the
burner assembly is removed.
8. First, carefully pull the burner assembly toward you
until it is clear of the locating pins in the mounting
brackets.
9. Then move the assembly away from the vest panel.
10. Finally, pull the assembly from the unit.
11. Once the burner assembly is removed, the burners
can be cleaned using a bottle brush.
12. For reassembly, follow the above steps in reverse
order.
Control Board Mounting Bracket
The control board mounting bracket is designed to be
removed to allow component access for some service
procedures. The ignition control board and the inducer
prover switch are mounted to the bracket.
1.
Disconnect electrical service and turn off gas to the
appliance.
2. Loosen the two screws securing the control mounting
bracket (it is not necessary to completely remove
them).
3. Lift the bracket clear of the screws and carefully lower
the bracket and ignition board to the bottom of the
compartment.
4. It may be necessary to remove the inducer prover
switch tubing at the switch.
5. For reassembly, follow the above steps in reverse
order.
Igniter
The igniter can be accessed from the front of the unit
without removing any other components. To remove the
igniter:
1.
Disconnect electrical service and turn off gas to the
appliance.
2. Disconnect the orange high voltage spark wire at the
ignition control board.
3. Remove the screw and pull the igniter out of the burner
assembly.
4. For reassembly, follow the above steps in reverse
order.
Rollout Switch
If for any reason the heat exchanger becomes blocked
the temperature-sensitive rollout switch located beside the
burners will open and the ignition control will turn off the
burners. After investigating and correcting the problem,
the rollout switch must be manually reset by pressing the
button on top of it.
The rollout switch can be accessed from the front of the
unit without removing any other components. To remove
the rollout switch:
1.
Disconnect electrical service and turn off gas to the
appliance.
2. Disconnect the orange and yellow wires at the rollout
switch.
3. Remove the screw and slip the rollout switch from
beneath the lanced tab on the burner assembly.
4. For reassembly, follow the above steps in reverse
order.
Flame Sensor
1. Remove the control board mounting bracket as
described previously.
2.
Remove the screw and pull the flame sensor from the
top of burner assembly.
3. For reassembly, follow the above steps in reverse
order.
Primary Limit Switch
The primary limit will shut down the unit in case of
overheating and automatically resets when temperature
falls to an acceptable level. It is not field adjustable
1. Remove the control board mounting bracket as
described previously.
2. Disconnect the two orange and yellow wires at the
primary limit switch.
3. Remove the three screws securing the primary limit
switch to the vest panel.
4. For reassembly, follow the above steps in reverse
order.
Inducer Prover Switch
1. Remove the control board mounting bracket as
described previously.
2. Disconnect the two purple leads at the inducer prover
switch.
3. If the tubing is in place, remove it.
4. Remove the screw securing the switch to the bracket
and slip the strap end out of the hole in the bracket.
5. For reassembly, follow the above steps in reverse
order.