Tag: RTH221B
-
Honeywell Home RTH221B Programmable Thermostat User Guide
Honeywell Home RTH221B 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/backup heat Do you need assistance? We are here to help. Call 1-800-468-1502 for wiring assistance…
-
Honeywell Home RTH221B Programmable Thermostat Installation Guide
Honeywell Home RTH221B Programmable Thermostat This is a legacy product document supported by Resideo. It is no longer manufactured Operation Controls Display screen When Cool On is flashing, this means the compressor protection is engaged (see section 1.7). Setting the clock Press the Set button. The message Set Time will appear on the screen and…