Hvac Tools and Tips - Lennox Furnace Guide
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Homeowners and do-it-yourselfers are often confused about what can and can't be done to fix Lennox Hvac furnace parts. This guide explains how a typical Lennox furnace works and includes a few fixes. First of all, the furnace operates automatically and is controlled by a thermostat so that when the climatic characteristic is set using the thermostat, the furnace will only kick on when the ambient climatic characteristic is lower than the thermostat setting.
Hvac Tools and Tips - Lennox Furnace Guide
Hvac Tools and Tips - Lennox Furnace Guide
In more detail: when the climatic characteristic drops below the thermostat setting, the transformer powers up the fan control board. Then the fan control board powers up the induced draft blower motor. At this point, a P1 pressure switch kicks in the ignition, giving power to the pilot gas valve, which is then lit. Once the ignition control sensors register pilot flame ignition, the main valve is opened and all burners are lit by the flame. It takes about thirty seconds for the electronic fan control (this is not adjustable) to turn on the blower and then for the blower to push air across the heat source. It is then that the heat begins to move into and through the ductwork, bringing warmth to the rooms. Once the climatic characteristic is again at the level set on the thermostat, the electric circuit shuts down, the main gas valve stops the flow of gas to the burners, and the blower runs for a preset (this is adjustable) time period.
Hvac Tools and Tips - Lennox Furnace Guide
Hvac Tools and Tips - Lennox Furnace Guide
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Hvac Tools and Tips - Lennox Furnace Guide
This is where Hvac tools and tips can come in handy, because the narrative above tells you how the Lennox Hvac furnace is supposed to work. When there is a malfunction, the furnace will begin to cycle agreeing to a heat sensing limit switch instead of being controlled by the thermostat. So, if a furnace should overheat-in other words, when the thermostat's control is no longer functional-the heat sensing switch keeps the furnace from running perpetually and overheating. It works in this way: The limit switch opens. It cuts off the main gas valve circuit, which stops the heat; then the furnace unit cools by way of a blower motor. Once all things has cooled sufficiently, the limit switch is deactivated, and when the unit is again at a normal climatic characteristic level and the limit switch has closed, the main burner will relight. Overheating and issues with the thermostat are signs that a technician should be called on to restore normal functioning.
Hvac Tools and Tips - Lennox Furnace Guide Specifications
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Hvac Tools and Tips - Lennox Furnace Guide
Final tip about maintenance: Be aware that motor and blower assemblies that are direct-drive don't need to be oiled; they're lubricated during manufacturing. However, lubrication of the blower motor may be required. A mighty Hvac Lennox technician who has the literal, Hvac tools and knowledge can take care of this task safely and effectively.
Hvac Tools and Tips - Lennox Furnace Guide
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Hvac Tools and Tips - Lennox Furnace Guide
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