KNOW THE WATER HEATER’S COMPONENT PARTS
Burner/Manifold Door Assembly
The burner/manifold door assembly consists of several components such as: main burner, burner orifice, manifold tube and flame sense / hot surface igniter. See figure below for the complete list of components (Figure 13).
Figure 13. | Main Burner |
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Manifold |
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Tube |
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Manifold |
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Door | Scoop side to be placed |
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View | Flame Sense / Hot Surface | ||
on the same side as | |||
Port | View Port. | Igniter Assembly | |
| Burner Orifice* |
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Flame Sense/
Hot Surface
Igniter Assembly
Door Gasket
Burner Screws
*DO NOT operate the water heater without the burner orifices installed.
Figure 14. |
Air intake |
Chamber |
Screen |
Air intake |
Chamber |
Fan |
Air intake |
Chamber |
Air Intake Chamber Fan
The small fan at the top of the air intake chamber on the side of the water heater is used to draw in necessary combustion air for the efficient operation of the main burner. The fan pressurizes the sealed combustion chamber which in turn allows the flue baffle inside the center flue tube to slow down the hot exhaust gases so heat can be extracted into the water before exiting into the vent system. The air intake chamber fan runs for about 5 seconds to pre- purge the combustion chamber before the beginning of an ignition sequence when there is a call for heat. The fan will continue to operate while the main burner is in operation and for about 5 seconds after the temperature set point has been achieved. The air intake chamber screen covering the fan should be inspected and cleaned periodically to assure it is not limiting air flow into the chamber (Figure 14).
Pressure Switch
A pressure switch in the control string of this water heater is used to verify there is an adequate flow of combustion air into the combustion chamber before and during main burner operation. It is electrically connected to the gas control valve/thermostat and controls the opening and closing of the gas valve. If there is an insufficient air supply being delivered to the combustion chamber the pressure switch will not allow the water heater to operate (Figure 15).
Figure 15 |
Pressure |
Switch |
12