MODINE Duct Furnace DFS350AFRHN10A1

Does the unit have a dirty filter warning light?

Check the condition of the filters

Is the filter in a dirty atmosphere?

Record maintenance actions taken

Blower Bearings Inspection and Maintenance

Check blower bearings for the following issues

Are the blower bearings properly lubricated?

Lubricate the blower bearings as per manufacturer's recommendations

Do the blower bearings need replacement due to wear?

Drive Sheaves and Belts Inspection

Inspect drive sheaves and belts for the following conditions

Are the drive sheaves and belts in good condition?

Adjust or replace drive sheaves and belts if necessary

Remove the burner side access panel

Remove the screws holding the burner side access panel

Disconnect the pilot supply line from the gas valve

Disconnect the ignition cable from the ignition controller

Remove the burner side access panel

Disconnect gas manifold at ground union joint

Remove the two screws holding the manifold to the heat exchanger support

Slide the manifold through the manifold bracket

Ensure the unit is free from dust, dirt, grease, and foreign matter

Inspect burner ports and pilot burner orifices for cleanliness and damage

Refer to Burner and Pilot Assembly Removal for detailed inspection

Air Shutters and Main Burner Orifices

Inspect air shutters and main burner orifices for cleanliness and damage

Refer to Manifold Assembly Removal for detailed inspection