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Discussion Starter · #1 ·
I want to replace my thermostat and i'm confused by the wiring diagram. I figured it would be easy if i just disconnected the wires from the terminals on the old one and connected them to the same terminals on the new one. Unfortunately the diagrams do not match. The old terminals are labelled
RC --- currently red wire in this terminal
RH --- currently black wire in this terminal
W--- currently white
Y --- currently orange
G --- currently green.

The new thermostat terminals are labelled
R --- which i'm assuming is red
C --- which also states that this terminal is not necessary with batteries
Y --- which i'm assuming would be the orange wire
G --- which i'm assuming is green
O/B --- which i'm guessing ( not gonna lie) is black
W --- which i'm assuming is the white wire

If someone would be so kind as to help a carpenter out and confirm or deny my assumptions it would be most appreciated

Hvac Pro
23,688 Posts
The new tstat won't work with your system. You need one that can handle a separate RC for cooling wire and RH for heating wire. Check HDepot or Rona for some of the better Honeywell electronic tstats and look at the box info/wiring diagram or open it and check the wiring diagram B4 bringing it home.
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