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CAUTION: Make sure all power to your HVAC system is shut OFF at the breaker before proceding.
The first step to properly wiring your new thermostat is to carefully label the existing wires from you old thermostat.
If it's too late and you have already disconnected them from your old thermostat. CLICK HERE 
Place cooresponding labels (included in your Ritetemp thermostat package) on the wires. Listed in the table below are the wires commonly found in home installations and what they do.
Once they are labeled remove the wires from the terminals of the old thermostat. Be careful not to touch the bare wires together when handling them, this could damage your HVAC system. Make sure the wires do not fall back inside the wall. Winding them around a pencil to keep them from falling back in works well. You can fill wall opening with fiber glass insulation to prevent drafts.
When all your wires are correctly labeled reference the install manual for your unit.
Common Wire Names:
R or RH - HEATER TRANSFORMER
W - HEATING CONTROL
G - FAN RELAY
C - 24 VAC COMMON (optional)*
Y - COOLING COMPRESSOR
RC - COOLING TRANSFORMER
O - DAMPER OR CHANGEOVER VALVE (POWERED IN COOL)
B - DAMPER OR CHANGEOVER VALVE (POWERED IN HEAT)
* The optional C-wire should be connected if available, it will extend your battery life significantly.
NOTE: If the wire names here do not match the wires you have CLICK HERE
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