The "O" terminal operates the reversing valve during the cooling cycle and the "B" terminal operates it during the heating cycle.
The "O" and "B" terminals on a Honeywell digital thermostat send power to a heat pump's reversing valve. I.e. MFR: TH6210U2001/U . Honeywell TH6220U2000/U - T6 Pro Programmable Thermostat, 2 Heat/1 Cool Heat Pumps or 2 Heat/2 Cool Conventional Systems: Gemaire Item Number: TH6220U2000/U: Manufacturer Product Number: TH6220U2000/U: SKU - PIM Number: 1475138092570: ERP Number: 367323: Unit of Measure: EA: Weight: 0.8 Pounds (Lb) Length: 1.1 Inches (In) Width: 4.1 Inches (In) Height: 4.1 Inches (In) Country … But if you upgrade from a non programmable model that not use the C wire, then you may have to improvise. • Screws and anchors • Professional Install Guide • Getting Started Guide *TH6320WF2003 depicted. do not connect any wire to w for heat pump applications! We discuss how to do this in more detail below. The table above provides a more complete list of Honeywell thermostat wiring colors and their uses. Other models may vary. Honeywell T6 Pro Thermostat 2H/1C Programmable TH6210U2001 Honeywell's brand new Thermostat T series line offers simplicity and a streamlined installation, warranty and support processes. Usually only Rheem and Ruud brand heat pumps use the "B" terminal. The heat pump's wiring diagram identifies the reversing valve and its operation. some heat pumps use b rather than o for reversing valve.
C – 24 VAC Common (You might see blue, purple, or brown typically used for this wire). Sign in to see real-time inventory at the stores closest to you. 1-1. 5X Contractor Pro Points; Availability . If you’re replacing a thermostat that has a glass tube with mercury in it, then do recycle it properly. The T6 Pro Smart Multi-Stage Thermostat with up to 2 Heat/1 Cool uses geofencing and connects to your other smart home devices to help you save energy. this can cause heat to run continuously. • Honeywell Decorative Cover Plate – Small; size 4-49/64 in = 121mm. This series replaces the PRO and PRO Focus series and is designed to have one footprint the UWP mounting system, making installation and programming easier and quicker. 1. Honeywell Thermostat Wiring Diagram 4 Wire Examples. l only connected if heat pump has a fault terminial. But here is a list of the most common wire color mappings, as seen in many four wire t-stat setups.

What’s the price? Honeywell - TH6210U2001 T6 Pro Programmable Thermostat - up to 2H/1C Heat Pumps or 1H/1C . You may have to run the C wire power to your new t-stat. Honeywell RTH6360D 5-2 Day Programmable Thermostat Easily schedule the thermostat so that your system will meet your temperature and comfort needs for the week, or for weekdays and weekends. Item: TH6210U2001 . Honeywell Smart Thermostat Wiring Prep WARNING! The use of Smart Response Learning will allow this thermostat to learn your preferred heating/cooling cycle times to deliver precision temperature when it's needed. th6210u2001 th6220u2000 th6320u2008 1 common required.