Title: Replace the gas orifice and gas burner.
Course: Heating, Ventilation, Air Conditioning, and Refrigeration II (17056-II) > Section: Servicing and Maintaining Fossil Fuel Heating Systems

Replacement should include

- checking the orifice for each brand name and size (British thermal units [BTU]) furnace
- identifying the orifices by type (liquid propane [LP] or natural gas system)
- installing a gas burner (LP or natural gas system), following manufacturer guidelines.

Process/Skill Questions:

- What type of gas orifice is standard on new furnaces?
- What is the gas pressure setting for the LP orifice?
- What is the gas pressure setting for the natural gas orifice?
- What causes burner failure?
- Why are burners tapered?