Honeywell RTHL3550 Non-programmable Thermostat Installation Guide

Honeywell RTHL3550 Manual: Questions and Answers

How do I connect wires to the Honeywell RTHL3550 thermostat?

Match each labeled wire to the same letter on the thermostat. Loosen the screw above each terminal, insert the wire into the hole beneath it, and tighten until secure.

1. Match each labeled wire with the same letter on the thermostat.
2. Use a screwdriver to loosen the screw at each terminal.
3. Insert the wire into the hole under the screw.
4. Tighten the screw until the wire is secure.
5. Push excess wire back into the wall opening. Installation Guide, p. 26

What's the difference between cooling and heating changeover valve settings on the Honeywell RTHL3550?

Cooling uses wire labeled O connected to O/B terminal. Heating uses wire labeled B connected to O/B terminal. Installation Guide, p. 16

What does the NEXT button do on the Honeywell RTHL3550?

After selecting the correct setting, press it to display the next function. Installation Guide, p. 16

What temperature range does the Honeywell RTHL3550 support for heating?

40° to 90 °F (4.5° to 32 °C). Installation Guide, p. 28

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