yourhome.honeywell.com RTH2300/RTH221 Series Programmable Thermostat Identify System Type This thermostat is compatible with the following systems: • Gas, oil or electric furnace • Central air conditioner • Hot water system with or without pump • Millivolt system • Central heating and cooling system • Heat pump without auxiliary.. An rth2300 rth221 wiring diagram is a visual guide that shows how to connect the wires of an rth2300 thermostat to the wires of an rth221 thermostat. This can be necessary when replacing an old thermostat with a new one, or when moving a thermostat from one location to another.. Honeywell Rth2300/rth221 Wiring Diagram. Source: www.
3. Follow Wiring Diagram. Refer to the Honeywell RTH2300 thermostat wiring diagram provided in the manual or on the manufacturer's website. Follow the diagram carefully to ensure that the thermostat is wired correctly. Incorrect wiring can cause the system to malfunction, potentially leading to electrical damage or injury. 4. Avoid Touching.. View and Download Honeywell RTH221 Series quick installation manual online. RTH221 Series thermostat pdf manual download. Also for: Rth2300 series.. Advanced Installation Guide Alternate Wiring If labels do not match letters on the thermostat, check the chart below and connect to terminal as shown here (see notes, below).. RTH2300/RTH221.