MODINE Heater PD 175

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

Lower bottom pan to expose burner and manifold (see fig. 13.1)

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 two screws holding the manifold to the heat exchanger support

Check the following components for proper assembly

Clear any foreign matter from fan blades

Blower Bearings Inspection and Maintenance

Check blower bearings for unusual wear

Were the blower bearings lubricated according to manufacturer's recommendations?

Were any blower bearings replaced?

Check drive sheaves for alignment

Check drive sheaves are securely fastened

Check that all the parts are in place

Burner and Pilot Assembly Removal

Lower bottom pan to expose burner and manifold

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

Remove the two burner retaining pins