It is always important to pay attention to the wiring that you have at the air handler.
Rheem gas furnace thermostat wiring.
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Rheem furnace thermostat upgrade i have a rheem classic 90 plus multi stage natural gas furnace ac humidifier unit that was new in 2000.
As you can see in the photo above this furnace does not have a c wire hooked up.
I found all cables at the thermostat end but can t figure out where to connect the c wire to the furnace rheem reab 1415j.
Looking inside my 2010 rheem gas furnace.
The return wire is usually red and labelled r vr r or v vr.
The reversing valve wire for cooling is typically orange but is occasionally blue and labelled o.
Verify that the red wire is connected to the r terminal green wire to the g terminal and white wire to the w terminal.
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If not connect them in this manner.
The stage one heating and cooling wire is typically yellow and labelled y y1 or m.
How to wire low voltage thermostat wiring on a rheem rbhp air handler.
Strip the brown thermostat wire back one half inch and connect it to the w2 terminal on the furnace.
This controls the second stage of heating.
This connects to the y terminal.
This connects to the r terminal on your rheem and ruud thermostat.
With nearly 100 years of experience rheem has used the power of gas to fuel some great advancements in energy efficient home heating making a rheem gas home furnace one of the smartest choices you can make.