Programmable Thermostat RTH221
Overview
Thermostat features..............................2
Quick start.............................................3
Quick reference to controls...................4
Quick reference to display.....................5
Programming & Operation
Setting the clock....................................6
System switch (Heat/Cool)....................7
Fan switch (Auto/On).............................8
Using the schedule...........................9-11
Temporary schedule override..............12
Permanent schedule override.............13
Compressor protection........................14
Appendices
Battery replacement........................... 15
In case of difficulty..............................16
Customer assistance.......................... 17
One-year limited warranty.................. 18
Table of contentsYour new thermostat is pre-programmed
and ready to go!
See page 3 for quick start.