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They may be as simple as an off/on thermostat or as complex as a building automation system using BACnet or LonWorks, for example. Common control components include temperature sensors, humidity sensors, sail switches, actuators, motors, and controllers.
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The control circuit in a household HVAC installation. The wires connecting to the blue terminal block on the upper-right of the board lead to the thermostat. The fan enclosure is directly behind the board, and the filters can be seen at the top. The safety interlock switch is at the bottom left. In the lower middle is the capacitor.
The term programmable communicating thermostat (PCT) is used by the California Energy Commission to describe programmable thermostats that can receive information wirelessly. The first version of the PCT introduced in the 2008 building standards proceeding also required that PCTs allow temperature control during emergency events to avoid blackouts.
In the 1990s, Carrier stopped using the "Day & Night" brand (which was the "D" in the BDP division, or Bryant-Day & Night-Payne) but it was revived in 2006 by ICP. In 2001, Carrier was the "world's largest manufacturer of air-conditioning, heating, and refrigerator equipment" with a "total employment of 42,600" and a revenue of $8.9 billion.
The gas savings for manual thermostat replacements (10% per thermostat) was found to be larger than for programmable thermostat replacements (8% per thermostat). The difference in electricity savings between homes whose prior equipment was a manual thermostat or programmable thermostat was found to be minimal.
It is otherwise identical in operation to the earlier type. Many cars of the 1950s, or earlier, that were originally built with bellows thermostats were later serviced with replacement wax capsule thermostats, without requiring any change or adaption. This most common modern form of thermostat now uses a wax pellet inside a sealed chamber. [6]
The Bryant Chucking Grinder Company was founded in 1909 by William LeRoy (Roy [6]) Bryant, one of the machine tool entrepreneurs mentored by James Hartness of the Jones & Lamson Machine Company (J&L). Roy Bryant had joined J&L in 1897, [3] became chief draughtsman in 1899, [3] and was chief engineer by 1905. [3]
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