Honeywell RTHL3550 Owner's Manual page 3

Table of contents
Installation
Installation ............................................3
Advanced Installation .........................10
About your new thermostat
Controls and Home screen
quick reference ...................................12
Compressor protection .......................14
Replace batteries ...............................14
1 Turn Off Power to Heating/Cooling System
2 Remove Old Thermostat
Remove old thermostat but leave wallplate with wires attached.
Do not remove wallplate yet
Terminal
designation
Circuit breaker
box
C
Appendices
Troubleshooting ..................................15
Limited warranty .................................16
or
Heating/cooling system
M31535
power switch
If you have an older thermostat with a
sealed mercury tube, turn to page 2
for proper disposal instructions.
MCR33823
3