Robertshaw RS9220 Operation Manual page 7

Caution:
When the battery icon
to avoid damage to your HVAC system. Freezing or overheating could occur.
Battery Door Information
Press the lower portion of
the thermostat to open the
easy access battery door.
THERMOSTAT QUICK REFERENCE
appears, replace the alkaline AAA batteries immediately
Install two
AAA Alkaline
batteries
into battery
compartment.
Be sure to
match positive (+) ends of batteries
with positive (+) battery terminals in
the battery compartment.
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