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Thermostat Wiring Diagrams [Wire Installation] Guide

Single Stage vs. Two Stage Programmable Thermostat Wiring
Dec 03, 2009Reader question: I just picked up a new Trane programmable thermostat for our air conditioner/heat pump system. When I took the front off the current honeywell thermostat, it looks like there are quite a few more wires than what the new thermostat will accept. The thermostat has seven wires connected to terminals labeled C, R, W2, E, Y1 and W1 together (with a jumper), O/B, and G.
How to tell if your system is Nest thermostat compatible
Two stage heat pump with separate two stage furnace heating (Dual fuel) 1, 2 : Humidifier* or dehumidifier 1, 2 : can quickly tell if you have one of these systems without having to use the Compatibility Checker or to look at your thermostat’s wiring. If you have one of the system types below, it won’t work with a Nest thermostat.
How to Connect the Thermostat to a Two Stage Forced Air
A two stage furnace works like this: your thermostat calls for heat and the furnace kicks on low. After a predetermined amount of time, if it has not satisfied the temperature, it kicks up to high until the temperature is satisfied. For this extra stage, you need to connect one additional wire to your furnace and your thermostat.
Thermostat Wiring Diagrams [Wire Installation] Simple Guide
Thermostat Wiring Diagrams for Heat Pumps - Heat Pump Thermostat Wire Diagrams. Heat pumps are different than air conditioners because a heat pump uses the process of refrigeration to heat and coole an air conditioner uses the process of refrigeration to only cool, the central air conditioner will usually be paired with a gas furnace, an electric furnace, or some other method of heating.
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