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| thermostat | a device that senses temperature changes to control another operating device |
| low voltage thermostat | a thermostat typically used for residential and commercial heating and cooling. It switches a circuit carrying 24 volts. |
| line voltage thermostat | a thermostat that switches a circuit carrying 120 or 240 volts of electricity |
| heat anticipator | a resistor (usually adjustable) that turns off the heating system before the set-point temperature is reached |
| cold anticipator | a fixed resistor in a thermostat that turns on the cooling system before the set-point temperature is reached |
| cut-out point | the point or condition when an electrical circuit opens |
| cut-in point | the point or condition when an electrical circuit closes |
| differential | the difference between the cut-in and cut-out points of a control |
| pressure transducer | a pressure-sensitive device that converts a pressure signal into an electrical signal |
| ambient temperature | the temperature in a room or surrounding a piece of equipment |
| pressure relief valve | a valve that is designed to open at a specific pressure and release vapor |
| system lag | when the space temperature drops below the temperature set-point |
| system overshoot | when the space temperature rises above the temperature set-point |
| temperature swing | the difference between system lag and system overshoot |
| open-on-rise device | a device that breaks an electrical circuit when the temperature rises above a set-point |
| close-on-rise device | a device that makes an electrical circuit when the temperature rises above a set-point |
