RESIDENTIAL GAS AND ELECTRIC WATER HEATER
SERVICE HANDBOOK
Residential Gas - continued
Sooting causes:
If … | … then | |
the burner is clean but the chamber and/or flue | check for lack of supply air. | |
are sooted |
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|
the main burner, chamber and flue are sooted | check the following: | |
| • | incorrect orifice |
| • | excessive gas pressure |
| • | loose main burner |
| • | cross threaded orifice |
| • gas control valve gas seepage | |
| • loose gas connection in burner assembly. | |
Electrical Testing |
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|
This type of water heater has its own electrical generating system.
When two dissimilar metals are joined together and this joint is heated, a small, electrical current will be produced. A thermocouple uses this science.
Thermocouple output test
Procedures/Conditions:
TO GROUND
Meter set for DC millivolt testing
Test from lower ECO (emergency cut off or energy cut off) solder joint to ground.
Note: If pilot will not stay lit, manually hold the top knob down in the pilot position. This allows gas to flow to the pilot. Light the pilot and continue to hold this knob down while conducting the test.
If … |
| … then | |
reading test of at least 13 | MV is not present | • | check that flame contacts end of |
|
|
| thermocouple |
|
| • | replace thermocouple. |
reading test of at least 13 | MV is present | continue to next test. | |
A.O. Smith Water Products Company | 12 | Training Department | |
©2002 | Ashland City, Tennessee | ||
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