Diagram Of A Thermostat. How to wire a 4 wire phone jack connection. The color of wire r is usually red and c is black.
If you have a two stage heat pump then you will also utilize terminal y2 for the second stage. The complement of a set using venn diagram is a subset of u. 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.
With auxiliary and emergency heat fans.
One speed you can. 15 thermostat cap clamp screwfast idle cam lever 16 17 thermostat cap clamp 18 thermostat cap assembly indexed 19 thermostat cap gasket 20 compression nut 21 choke housing screw 22 hex nut 23 lockwasher 24 choke thermostat lever spacer 25 thermochoke thermostat lever 26 stat lever piston assembly 27 choke housing shaft. Always follow the manufacturers instructions for both the thermostat and the hvac system. Wiring diagrams use simplified symbols to represent switches lights outlets etc.