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RESIDENTIAL GAS, NON POWER VENTED, WATER HEATER
SERVICE HANDBOOK
•Possible carbon monoxide
•Smell of burnt gas in the room
Residential Gas – continued
The instruction manual gives guidelines under “Air Requirements” and “Unconfined “ or “Confined Space” sections. If you want to test for a lack of air:
1.Turn on every appliance and fan that exhausts air from the utility room and/or house. Make sure all windows and doors are closed, as well as chimney dampers.
2.Open a hot water faucet so that the main burner will ignite
3.Remove the outer door of the water heater – not the inner door
4.Monitor the flame characteristics for several minutes
If the flame begins to “yellow” open a door or window, to the outdoors, to see if additional air corrects this back to blue. If it does, the room needs more air supply. Perform draft test at draft hood of water heater with match or smoke source to verify.
| Testing with |
|
| Gas |
|
Manifold | Pressure | Pilot Gas |
Gauge | ||
Gas Pressure |
| Pressure |
Test |
| Test |
Gas pressure checks are done with flowing gas.
Supply gas pressure checks are taken ahead of the gas control and as close to the heater as possible.
Pilot gas pressure checks are taken by using fitting adapters to tap into the pilot gas tubing. Manifold (main burner) gas pressure is measured using the Allen wrench tap on the bottom of the control valve.
Desired gas pressures will be noted on the gas valve label.
If … | … then | |
supply gas pressure is under desired pressure | • increase supply gas pressure regulator | |
setting |
| setting and, |
| • increase supply gas piping size. | |
supply gas pressure is over desired pressure | • | add gas pressure regulator. |
| • | reduce setting on existing regulator. |
pilot gas pressure is more than | replace the control valve. | |
W.C. from desired |
|
|
manifold gas pressure is more than | replace the control valve. | |
W.C. from desired |
|
|
Additional considerations when pilot or main burner flames are too large or too small:
•Incorrect orifice
•Dirt in orifice or gas supply tubing
State Water Heater | 11 | Technical Training Department |
© 2004 |
| Ashland city, TN |