Thermostat Wiring Diagrams. In the honeywell t87f thermostat series the single pole double throw switch makes closes one set of contacts when the temperature falls to turn on the heating appliance. With the top thermostat wiring diagram showing an air conditioning system.
Thermostat wiring diagrams for heat pumps heat pump thermostat wire diagrams. With 2 wire 3 wire and 4 wire thermostats you dont have all of these. Heating call for heat normally open common.
However it does not mean link between the wires.
Y plan system schematic. Get in touch with our friendly team to find out how we can help you. If both o and b are present connect only the o wire. Heat pump thermostat wiring diagram heat pump thermostat wiring a typical wire color and terminal diagram as shown in the diagram you will need to power up the thermostat and the 24v ac power is connected to the r and c terminals.