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RTH221

Honeywell
Part Number RTH221
Manufacturer Honeywell
Description Programmable Thermostat User Guide
Published Aug 16, 2018
Detailed Description  Operation 1.1 Controls Press to set clock or schedule Press to override schedule and hold temperature Press to run (fo...
Datasheet PDF File RTH221 PDF File

RTH221
RTH221

Overview
 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 displa...


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