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RESIDENTIAL GAS, NON POWER VENTED, WATER HEATER
SERVICE HANDBOOK
Residential Gas – continued
Burner:
The burner assembly consists of the main burner, main burner orifice, main burner
gas supply tube, pilot burner, pilot burner orifice, pilot burner gas supply tube and thermocouple.
The pilot burner remains on once it is manually lit. When incoming cold water activates the
thermostat, gas flows to the main burner. The pilot flame ignites this gas. The main flame
burns until the tank reaches set temperature then the thermostat interrupts this main gas flow.
AFTER HAVING CONFIRMED THAT THE WATER HEATER HAS BEEN INSTALLED
PER THE INSTALLATION MANUAL INSTRUCTIONS:
Normal Operation
Electrical:
The Pilot Flame heats the end of a thermocouple. As the thermocouple is heated,
it generates a small (cannot be detected without an electrical meter) electrical current to the
bottom of the control valve. This current powers the electromagnet and holds open the safety
valve as long as the pilot flame is heating the thermocouple. DANGER! If the pilot is
extinguished, it can take up to 180 seconds for the thermocouple to cool sufficiently to close the
safety valve.
See also C3 technology product information beginning on page 15 .
7
State Water Heater
Technical Training Department
© 2004
Ashland city, TN
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