Lennox SureLight Ignition

Below is a link for the service manual for the Lennox SureLight Ignition System...just remember when in doubt, read the manual.

Surelight Ignition System

AC

Abbreviation for alternating current, a type of electric current in which the polarity is constantly reversing causing the electron flow to reverse.

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AC or DC

Abbreviation for equipment capable of operating on alternating or direct current.

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Contactor

A switch that can repeatedly cycle, making and breaking an electrical circuit. When sufficient current flows through the A-coil built into the contactor, the resulting magnetic field causes the contacts to be pulled in or closed.

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DC

Direct current electricity. This type of electricity (as opposed to Alternating Current, or AC) flows in one direction only, without reversing polarity.

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Fuse

A metal strip in an electrical circuit that melts and breaks the circuit when excessive current flows through it. The fuse is designed to break in order to save more expensive electrical components.

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Hertz

In alternating current (AC electricity), the number of cycles per second.

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NEC

National Energy Council / National Electric Code

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NEMA

National Electrical Manufacturing Association

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Variable-Speed Motor(s)

The fan motor inside Trane's variable-speed air handlers is designed to vary its speed based on your home's heating and air conditioning requirements. Working in conjunction with your thermostat, it keeps the appropriate-temperature air (e.g. warm air on cold days) circulating throughout your home, reducing temperature variances in your home. It also provides greater air circulation and filtration, better temperature distribution, humidity control, higher efficiency, and quiet performance.

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Volt

The unit of measure used to describe a difference in electrical potential; abbreviated by the symbol "v".

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Voltage

The force that pushes electrical current along wires and cables.

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Watt

The unit of electrical power equal to the flow of one amp at a potential difference of one volt.

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Automatic and Programmable Thermostats

Thermostats are one of the most misunderstood parts of the air conditioning system. I've actually been called to people's residences just to adjust the thermostat.

Check out the link below to have a better understanding of thermostats:

Automatic and Programmable Thermostats -- Dept of Energy

From: toolbase.org

What does d.c. mean?

Direct Current

You will most likely find d.c. stored in power cells and batteries. Direct current only flows in one direction.