29
ELECTRICAL
1. Check all wiring for loose connections.
2. Check for the correct voltage at the furnace (furnace
operating). Correct voltage is 230VAC ± 10%.
3. Check amp-draw on the blower motor with inner blower
panel in place.
Unit Name plate __________Actual__________
ML180UHA BURNER ASSEMBLY & REMOVAL
Manifold And Gas Valve
Retention Rings
Cross Over
Ignitor
Sensor
Rollout Switches
Figure 21
CLEANING THE BURNERS
NOTE:
Use papers or protective covering in front of the
furnace during cleaning.
1. Turn off both electrical and gas power supplies to furnace.
2. Label the wires from gas valve, roll-out switches, primary
limit switch and make-up box then disconnect them.
3. Disconnect gas supply piping. Remove the screw securing
the burner box cover and remove cover. Remove the four
screws securing the burner manifold assembly to the
vestibule panel and remove the assembly from the unit.
4. To clean burners, run a vacuum cleaner with a soft brush
attachment over the face of burners. Visually inspect
inside the burners and crossovers for any blockage
caused by foreign matter. Remove any blockage. Figure
21 shows burner detail.
5. Reinstall burner box, manifold assembly and burner box
cover.
6. Re-install gas supply and turn on electrical power to
furnace.
LENNOX MERIT SERIES™ BURNER ASSEMBLY & REMOVAL
