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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.
Thermostat Wiring Explained - Electrical Online
They just get a little more sophisticated so if you are pre-wiring a new home, check with the contractor providing the HVAC system as to what thermostat wiring is required. A new system may need as many as ten wires (like a two-stage heat, two-stage cooling
Heat Pump Thermostat Wiring Chart Diagram – HVAC
Heat Pump Thermostat Wiring Chart Diagram - HVAC - The following graphics are meant as a guide only. Always follow manufacturers instructions for both the thermostat and the HVAC system. Additional articles on this site concerning thermostats and wiring can help you solve your problem or correctly wire a new thermostat.
field wiring for 2 stage variable speed furnace
Nov 16, 2013Heating Request (two stage thermostat operation, 4th DIP switch must be in on position) (see furnace wiring diagram): 24 VAC signals applied to W1 terminal of EFT control. Same response as single stage thermostat operation described above except the control will not go to high fire, High Heat fan speed unless a W2 signal is applied.
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