AGA XH9004 : 1995

I. INTRODUCTION
II. CONTROLS AND THEIR FUNCTIONS
           Need for Controls
           Manual and Automatic Operation
           Basic Elements of Automatic Controls
           Evolution of Automatic Controls
III. MANUAL CONTROL OF GAS APPLIANCES
           Electric Switches
           Orifices
           Manual Adjustment of Controllers
IV. PHYSICAL PRINCIPLES USED IN CONTROLS
           Thermal Expansion of Gases, Liquids and Metals
           Electrical Heating of a Resistive Element
           Change of Electrical Resistance with
               Temperature
           Thermoelectric Effect
           Electromagnetism and Solenoids
           Change in Shape of Coils from Internal
               Pressure Changes
V. SENSING DEVICES
           Temperature Responsive Devices
           Pressure Responsive Devices
           Flow Sensing Devices
           Liquid Level Sensors
           Rotation Sensors
           Flame Sensors
           Thermocouple
           Bimetal
           Hydraulic or Mercury Vaporization Type
           Optical Systems
           Flame Rectification
VI. ACTUATION OF CONTROLS
           Self-Powered Devices
           Externally-Powered Devices
VII. AUTOMATIC CONTROLS
           Thermostats
           Automatic Gas Valves
           Limit Controls
           Gas Pressure Regulators
           Combination Controls
           Accessories
           Miscellaneous Controls
VIII. IGNITION SYSTEMS
           Automatic Pilots
           Oxygen Depletion Sensing (ODS) Pilots
           Pilot Relight Systems
           Intermittent Ignition Devices
IX. APPLICATION TO APPLIANCES
           Ranges
              Top Burner Controls
              Oven and Broiler Burner Controls
              Self-Cleaning Oven Controls
              Range Features and Accessories
           Automatic Water Heaters
              Automatic Storage Heaters
              Automatic Circulating Tank Type Heaters
              Instantaneous Water Heaters
              Swimming Pool Heaters
           Central Heating Systems
              Steam Heating
              Hot Water (Hydronic) Heating
              Hydronic Zone Control
              Warm Air Heating
              Potable Water-Source Space Heating Systems
              Room Thermostats
              Humidity Control
              Conversion Burners
              Wiring Considerations
           In-Space Heating Appliances
           Clothes Dryers
           Refrigerators
           Incinerators
           Air Conditioners
X. MAINTENANCE AND REPAIR OF CONTROLS
           Preventive Maintenance
REFERENCE SOURCES
GLOSSARY