Anticipators
A component of a thermostat that anticipates the temperature of an area and will stop or start the cooling or heating equipment to prevent the thermostat from overshooting the desired temperature.
Clock Thermostat
A thermostat that is used to control the temperature of a structure with a time function that can be set or programmed by the occupant of the structure. Clock thermostats can have multiple programs adding to their flexibility.
Differential
The difference between the cut-in and cut-out point of a control. This can be applied to thermostats, pressure switches, and most controls.
High-Pressure Switch
A pressure operated switch that opens or closes on a rise or fall in pressure on the high side of the refrigeration system. This type of switch can be used as a safety control that would open on when the pressure reached an unsafe condition or operate som
Humidistat
A device that is used to control humidity; it uses a moisture-sensitive element to control a mechanical linkage that opens and closes an electric switch.
Line-Voltage Thermostat
A thermostat that is used primarily to break line voltage to a load to control the temperature.
Low-Pressure Switch
A pressure operated switch that opens or closes in a rise or fall of pressure on the low side of the refrigeration system. This type of switch can be used as a safety control, to stop loads in the event of low pressure or operating control, to operate loa
Low-Voltage Thermostat
A thermostat that is designed to interrupt a 24-volt power supply to electrical loads depending on the temperature.
Oil Safety Switches
A switch that is used to open the circuit when the oil pressure in a compressor is below an acceptable level.
Pressure Switches
A device that opens or closes a set of contacts when a certain pressure is applied to the diaphragm of a switch.
Range
The operating ranges or limits of control.
Snap Action of a Thermostat
The closing of a set of contacts of a thermostat with a snapping motion rather than with a light contact.
Solenoid Valve
A valve that opens or closes by a solenoid coil being energized to pull a steel core into the magnetic field of the solenoid.
Staging Thermostat
A thermostat that is designed to open and close more than one set of contacts to control several modes of heating or cooling operation.
Thermostat
A device that responds to a temperature change by opening or closing a set of electric contacts.
Thermostat Controlling Element
The portion of a thermostat that reacts to temperature change by opening or closing the contacts through a mechanical linkage. Two types of elements are bimetal and bulb.
Time Clock
A clock that opens and closes contacts at specific time(s). Time clocks can be 24-hour or 7-day clocks.
Time-Delay Relay
A relay that delays its closing for a certain period of time.
Transformer
A device that decreases or increases the incoming voltage to the desired voltage.