Williamson-Thermoflo SCH High Boy, Manual Manual

SCH & SCL 

Oil Furnaces

 – 

Furnace Manual

22

670-000-006-1007

10

Service and maintenance 

Annual service and start-up 

Follow the “Service and maintenance” procedures given throughout this manual and in component literature shipped with the 
furnace. Failure to perform the service and maintenance could result in damage to the furnace or system. Failure to follow the 
directions in this manual and component literature could result in severe personal injury, death or substantial property 
damage. 

WARNING 

The furnace should be inspected and started annually, at the beginning of the heating season, only by a qualified service 
technician. In addition, the maintenance and care of the furnace outlined in the table below, and explained on the following 
pages must be performed to assure maximum furnace efficiency and reliability. Failure to service and maintain the furnace 
and system could result in equipment failure. 

WARNING 

This furnace contains fiberglass and ceramic fiber materials. These materials require special attention. Please refer to the 
WARNING and guidelines given on page 20. Failure to comply could result in severe personal injury, death or substantial 
property damage. 

WARNING 

Consult with homeowner to see if there were any  

Check sequence of operation

problems with furnace or system during the prior 

Check flame characteristics

heating season (or cooling season)

Perform combustion checks/tests per burner manual and

Clean, inspect, and lubricate blower motor and wheel

furnace manual

Check condition of electrical wiring and tightness of 

Check temperature rise

terminals and connectors

Check thermostat heat anticipator setting

Clean and inspect heat exchanger and combustion

Check safety controls (high-temperature limit switch, flame 

chamber

cutoff time, vent pressure switch, etc.)

Clean and inspect system accessories

Vent system

Clean and inspect flue pipe, chimney/vent, and draft regulator

Fuel oil system

Check oil tank and piping for leaks

Replace oil filter

Oil burner

Clean and inspect oil burner assembly

Bleed system of air (single-pipe system)

Check oil pump pressures

Check combustion air ducts, grilles, etc. (if applicable)

Furnace and air system

Service and maintenance

Service technician annual maintenance/start up

(see following pages and burner manual for instructions)

Check operation

Annual start up