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RTHL3550

1 69-2583ES—01

About your new thermostat

Thermostat features ...................................2

Quick reference to controls ....................... 4

Quick reference to display ........................5

Operation

Select fan setting (auto/on) ...................... 6

Select system setting (heat/cool)..............7

Adjust the temperature .............................. 8

Auto Changeover .......................................9

Built-in compressor protection ...............11

Appendices

Battery installation ................................... 12

Customer assistance ............................... 13

In case of difficulty...................................14

Limited warranty ......................................16

Table of contents

Honeywell RTHL3550D User Manual

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