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Operation
1.1 Controls
Press to set clock or schedule
Press to override schedule and hold temperature
Press to run (follow) programmed schedule
1.
Fan switch System switch Temperature adjustment buttons
1.2 Display screen
Setpoint indicator Appears when the setpoint temperature is displayed.
Low-battery warning Permanent schedule override Schedule period
Clock
Temporary schedule override
Temperature
System status • Cool On: Cooling is activated.
1
• Heat On: Heating is activated.
1 When Cool On is flashing, this means the compressor protection is engaged (see section 1.7).
1.3 Setting the clock Press the Set button. The message Set Time will
appear on the screen and the time display will flash.
Press the or button to set the time.
RTH221 Datasheet
