Determine functionality of normal thermostat

[thefirstnutzo]

which pins do what under what scenarios: Fan Cool Heat Aux

5 pins total? Which do what and when?

[thefirstnutzo]

http://www.electrical-online.com/thermostat-wiring-explained/ http://windsorwinair.com/wp-content/uploads/2016/01/4A6H4-Installation-Guide.pdf http://www.homecomfortsc.com/files/23-9093.pdf

[neogeek83]

Here's the thermostat Daniel has: https://forwardthinking.honeywell.com/related_links/thermostats/pro_3000/install/69_1775.pdf

• When AC is active, fan relay is not triggered (Labeled G). Cool changeover value is triggered (labeled O). And cooling (labeled Y) is triggered.

Here's a 4 wire thermostat like Kenny has: http://home.howstuffworks.com/home-thermostat3.htm

[thefirstnutzo]

AC Mode nothing active: O Active

AC Mode FAN: O Active G Active

AC Mode Cooling: Y Active G Active O Active

Heat Mode (nothing active): B Active

Heat Mode (FAN): B Active G Active

Heat Mode (heating): B Active Y Active G Active

Heat Mode (EM Heat): E Active G Active L Active Aux Active (after ~1 minute delay)

[thefirstnutzo]

4 Wire thermostat wiring:

red - 24v input yellow - cooling white - heating green - fan

1 - B - empty 2 - O - empty 3 - G - green 4 - Y - yellow 5 - W - white 6 - Not used 7 - R - jumpered 8 - RC - red (and jumpered)

FAN ON = GREEN AC ON = GREEN + YELLOW HEAT ON = WHITE

https://tomstek.us/4-wire-thermostat-wiring-color-code/