Owner’s Manual
Read and save these
instructions.
For help please visit
yourhome.honeywell.com
RTHL2310/RTHL221
Series
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 before returning
the thermostat to the store.
This thermostat cannot be used on heat pumps with
backup heat or on multistage systems.
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