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The illustration is the interior of a common two wire heat-only household thermostat, used to regulate a gas-fired heater via an electric gas valve. Similar mechanisms may also be used to control oil furnaces, boilers, boiler zone valves , electric attic fans, electric furnaces, electric baseboard heaters, and household appliances such as ...
The protocol is not polarity sensitive: wires can be swapped. [4] The maximum wiring length is 50 m up to maximum 2 x 5 ohm resistance. For backward compatibility with traditional switching thermostatic controllers, OpenTherm specified that if the two wires are connected together then the boiler will switch on.
Some 240V bimetallic thermostats have 3 wires, live (in), neutral (in), and control (out). They also have a resistor (typically 220 kOhm) between the wall (high thermal inertia) and the bimetallic strip, which is turned on by the thermostat, and dissipates about 1/4 Watt. The purpose of this is to reduce hysteresis.
The simplest resistance-thermometer configuration uses two wires. It is only used when high accuracy is not required, as the resistance of the connecting wires is added to that of the sensor, leading to errors of measurement. This configuration allows use of 100 meters of cable. This applies equally to balanced bridge and fixed bridge system.
The Ecobee 4 thermostat. Some smart thermostats, such as the Nest thermostat, can learn when the house is likely to be occupied, and when it is likely to be empty. This allows automatic pre-heating or pre-cooling so the temperature is comfortable when a resident arrives.
With a polar vortex bringing snow to the South for the first time in a longtime, there's a good chance many are clashing over what temperature to keep their homes.. The debate over the ideal ...
Most modern electric heating devices use nichrome wire as the active element; the heating element, depicted on the right, uses nichrome wire supported by ceramic insulators. Alternatively, a heat pump can achieve around 150% – 600% efficiency for heating, or COP 1.5 - 6.0 Coefficient of performance , because it uses electric power only for ...
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