MODINE Heater PDP 350

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

Inspect burner ports and pilot burner orifices for cleanliness and damage

Air Shutters and Main Burner Orifices

Inspect air shutters and main burner orifices for cleanliness and damage

Clean heat exchanger tubes from the bottom with a stiff non-wire brush

Check heat exchanger for cracks and discoloration of the tubes

Burner and Pilot Assembly Removal

Lower bottom pan to expose burner and manifold

Disconnect pilot tubing at the combination gas control

Disconnect thermocouple lead or ignition cable at the combination gas control

Remove the 2 burner retaining pins

Check the following components for proper assembly and condition

Clean any dust, dirt, or foreign matter from the fan blades

Blower Bearings Inspection and Maintenance

Check blower bearings for unusual wear

Are the blower bearings in good condition?

Lubricate blower bearings as per manufacturer's recommendations

Check drive sheaves for alignment

Are the drive sheaves securely fastened to the blower and motor shafts?

Lower bottom pan to expose burner and manifold (see fig. 16.2)

Disconnect pilot tubing and thermocouple lead (or ignition cable) at the combination gas control (and ignition control)

Disconnect control wires for the combination gas control

Disconnect gas manifold at ground union joint

Remove the 2 screws holding the manifold to the heat exchanger support