Owner’s Manual
Read and save these
instructions.
For help please visit
yourhome.honeywell.com
RTHL3550
Non-Programmable
Digital Thermostat
Installation is Easy
1. Label wires and remove your old thermostat
2. Install and wire your new thermostat
3. Set your new thermostat to match your heating/cooling system
• It is preset for the most common system
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 works on 24 volt or 750 mV systems. It
will NOT work on 120/240 Volt systems.
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