BASIC INSTALLATION & OPERATION
Energy Cut Off (ECO): A metal tube (Temperature | Figure 5 | Gas Control Knob |
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Probe) mounted onto the back of the gas control |
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valve/thermostat is immersed inside the tank water. |
| Reset Button |
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The probe acts as a temperature high limit. If water |
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gets excessively hot, an Energy Cut Off (ECO) switch |
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within the probe opens, interrupting the small electrical | Protective | Gas Inlet |
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current to the gas valve, and gas flow through the | Temperature |
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Plastic Sleeve | Probe |
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control is interrupted. NOTE: If this safety sensor opens, |
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the entire control must be replaced. The ECO is NOT |
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resettable. |
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Thermal Cut Off Switch (TCO): The water heater | Temperature | ECO |
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is also equipped with a resettable thermal switch, | Sensor |
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designed to shut off the gas supply in the event the |
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water heater has been exposed to high combustion |
| Thermocouple |
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chamber temperatures caused by flammable vapors | Gas Control Valve/Thermostat - Side View |
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(e.g. spilled gasoline), poor combustion caused by a |
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| TCO (Thermal | TCO (Thermal | |
blocked vent or insufficient combustion air. |
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| Cut Off) Sensor | Cut Off) Switch | |
Gas: When you prepare to light the pilot, you are instructed to turn the gas control knob to the pilot position and depress the gas control knob (Reset button
on Robertshaw Gas Valves). When depressed gas will flow to the pilot burner only. You then have to (manually)
ignite this pilot gas using the piezo igniter button. When the pilot is lit, the flame must heat the thermocouple until it generates sufficient voltage to the gas valve to allow you to release the knob while gas continues to flow to the pilot. When the gas control knob is turned to the “ON” position, gas is also available to the main burner if the thermostat calls for heat.
Water Flow: When a hot water faucet is opened, water pressure from the well tank or street main forces cold water into the water heater through the dip tube. This pushes hot water out of the tank.
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