Tubular Blower Fan Gas Unit Heaters - Periodic Maintenance

Should maintenance be required, perform the following inspection and service routine:

• Inspect the area near the unit to be sure that there is no combustible material located within the minimum clearance requirements listed in this manual.

• Turn off the manual gas valve and electrical power to the unit heater.

• To clean or replace the burners, remove any combustion air inlet piping from the unit, remove screws from access cover, and remove access cover. Remove top strip from above burners by removing sheet metal screws. Lift burners up and pull away from manifold to remove.

• With the burners removed, wire brush the inside surfaces of the heat exchanger.

• Remove any dirt, dust, or other foreign matter from the burners using a wire brush and/or compressed air.

• Inspect air inlet for blockage/debris. Clear if any found.

• Reassemble the unit heater by replacing all parts in reverse order.

• Check the burner adjustment.

• Check all gas control valves and pipe connections for leaks.

• Check the operation of the automatic gas valve by lowering the setting of the thermostat, stopping the operation of the gas duct furnace. The gas valve should close tightly, completely extinguishing the flame on the burners.

• Inspect and service motor/blower assembly. To maintain efficient air flow, inspect and clean the blower blades and housing to prevent buildup of foreign matter.

• Check and test the operational functions of all safety devices supplied with your unit.

Check motor lubrication. If oiling is required, add 1 or 2 drops of electric motor oil as follows:

• Light Duty - After 3 years or 25,000 hours of operation.

• Average Duty - Annually after 3 years or 8,000 hours of operation.

• Heavy Duty - Annually after 1 year or at least 1500 hours of operation.