Owner’s Manual
Read and save these
instructions.
For help please visit
honeywellhome.com
RTH2300/RTH221
Series
Programmable
Thermostat
M37777
Heat Off Cool Auto On
Fan
Heat Off Cool
Auto On
Fan
Set
Hold
Run
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.
Visit http://honeywellhome.com/support 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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