Page 13 of 16
507388-01
Issue 1732
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.
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.
3. Disconnect the inducer prover switch tubing at the
switch.
4. Remove the two screws on the combustion inducer
plate.
5. Pull the combustion inducer and plate toward you until
it is free of the dilution air box that supports it. Lower
the inducer and plate and rotate to pull the assembly
out of the compartment.
6.
The flue tube extension can be cleaned if necessary.
Leave it in place; do not remove it from the unit.
7. For reassembly, follow the above steps in reverse
order.
