<p>System. Fan coil system 2, know the above premise, we are to look at the NEST thermostat control. NEST works with 95% of 24V heating and cooling systems, including gas, electric, forced air, variable speed, heat pump, radiant, hot water, solar, and geothermal. (W1, W2, W3) (Heating) Cooling: 1 and 2 stages (Y1, Y2) Heat pump: with auxiliary and emergency heat (O / B, A, E) (heat pump) Humidifier or dehumidifier (HUM, DEHUM) (fan) Power (C, Rh, Rc) (power) The above can be seen NEST </p>
<p>thermostat using the US standard 24V control system, you can control most of the United States HVAC products. The following diagram shows the traditional US thermostat wiring diagram, you can see with the NEST wiring is basically the same, only the RH, Y, W, G four signal lines, NEST can be bought directly after the replacement of the traditional temperature Control device, also shows the United States are using a unified control standards. Traditional thermostat wiring diagram The following describes the </p>
<p>control principle of the United States thermostat: The United States thermostat schematic diagram from the figure can be analyzed, the host will have a transformer in the air conditioning system, the home voltage (US standard 120V) into 24VAC control voltage, through the R-line 24 + voltage to the thermostat, if there is C line then it is 0V (Common), through the W (heating), Y (cooling), G (fan) three relay 24V voltage To the heating, cooling and fan signal points to control the corresponding equipment. </p>
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