The Honeywell Rth221b thermostat comes with a clear and user-friendly wiring diagram. It provides detailed instructions on how to connect the wires from your HVAC system to the thermostat. It's crucial to follow these instructions carefully and ensure each wire is correctly connected to the corresponding terminal on the thermostat.. To wire the Honeywell RTH221B thermostat for a natural gas fireplace with two wires, follow these steps: 1. Identify the Wires: Since the two wires are not labeled, one will typically connect to the "R" terminal (power) and the other to the "W" terminal (heat signal). 2. Connect the Wires: - Attach one wire to the "R" terminal on the thermostat.
The wiring connections for the Honeywell RTH221B thermostat are typically straightforward, but it's important to follow the wiring diagram and instructions provided to ensure proper installation. The thermostat will usually have terminals labeled R, W, Y, and G, which correspond to the different wires coming from the heating and cooling systems.. View and Download Honeywell RTH221 Series quick installation manual online. RTH221 Series thermostat pdf manual download.. Thermostat Honeywell RTH221B User Manual. Owner's manual (9 pages). Page 5 Label Wires with Tags Label the wires using the supplied wire labels as you disconnect them. M28100 Wire Labels M28093 69-2606ES—01.