In such cases, there are two power wires from the HVAC system, often called “Rh” the power wire directly from the heating system transformer, and “Rc” the power wire directly from the cooling transformer. Input 462 is from a terminal connected to the Rc wire. According to some ...
1). Attach theRedwire to the R terminal for 24VPower– or to the RC terminal if that is where it was on the old thermostat. 2). Attach theWhitewire to the W terminal for the heat pump’sHeatingmode. 3). Attach theYellowwire to the Y terminal forAC/cooling mode. ...
TIDA-01574 Block Diagram Copyright © 2017, Texas Instruments Incorporated TIDA-01574 Smart Thermostat Power Stealing Topology Li-Ion/LiPo Battery Wide VIN DC/DC Buck Rectifier Current limit PTC Fuse OV Protection Priority MUX and Boost Converter MCU Thermostat Control 24-V AC Rc/Rh W 24-V AC...
Other examples of wiring warnings, according to some embodiments, include: Rh pin detected (i.e., the insertion of a wire into the Rh terminal has been detected) but that Rh wire is not live; Rc pin detected but Rc wire not live; W1 pin detected but W1 wire not live; AUX pin ...
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In such cases, there are two power wires from the HVAC system, often called “Rh” the power wire directly from the heating system transformer, and “Rc” the power wire directly from the cooling transformer. Input 462 is from a terminal connected to the Rc wire. According to some ...
In the case of cooling the Y wire is shorted to the Rc (or R or Rh depending on the configuration). By shorting these two wires, the 24 VAC transformer is placed in series with a relay that controls the HVAC function. However, for power harvesting, a problem is that when these wires...