Page 14 of 18
507388-01
Issue 1504
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 leads 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 leads 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.
Burner orifices
Orifices are threaded into the gas manifold. To remove them:
1. Remove the burner & manifold assembly as described
previously.
2. Remove the four screws securing the gas manifold to the
burner assembly.
3. Remove the orifices by unscrewing them. Do not use any
pipe thread sealant during reassembly.
4. For reassembly, follow the above steps in reverse order.
Combustion inducer
The combustion inducer can be removed for inspection,
replacement, or to access the heat exchanger and flue tube
extension for cleaning. To remove the combustion inducer:
1. Remove the control board mounting bracket as described
previously.
2. Disconnect the black inducer motor leads.
