MODINE Unit Heater HDS250AS0111SBAN

Use only factory-approved service replacement parts

Ensure the following precautions are taken

Ensure personnel are trained and familiar with the operation of unit heaters and their controls

Turn off gas at the manual shut-off valve ahead of the combination gas control

Turn off all electric power to the heater

Motor and Blower Housing Cleaning

Turn off gas at the manual shut-off valve ahead of the combination gas control

Turn off all electric power to the heater

Verify the following before servicing

Is the service being performed by a qualified service agency?

Are all mechanical or electrical controllers that have been wet replaced?

Check the unit and venting system

Ensure all service and repairs use factory-approved replacement parts.

Verify the appliance model number, serial number, and company address from the rating plate.

Confirm that servicing is performed by a qualified service agency.

Ensure no attempt is made to reuse any mechanical or electrical controllers that have been wet.

Turn off gas at the manual shut-off valve ahead of the combination gas control.

Turn off all electric power to the heater.

Ensure all servicing is performed by a qualified service agency.

Turn off gas at the manual shut-off valve ahead of the combination gas control.

Turn off all electric power to the heater.

Verify the following information from the rating plate

Check gas valves and piping for general cleanliness and tightness.

Inspect gas controls to ensure proper operation of the unit.

Pre-Maintenance Safety Precautions

Turn off gas at the manual shut-off valve ahead of the combination gas control.

Turn off all electric power to the heater.

Keep unit free from dust, dirt, grease, and foreign matter, paying particular attention to:

Remove the access panel, open the union on the gas line, and disconnect the igniter and sensor wires.

Remove the screws that attach the burner tray to the header plate and remove the burner tray and manifold assembly from the heater.

Carefully clean the burners with a wire brush or other suitable means.

Replace any damaged or deteriorating burners or orifices.