Honeywell RTHL3550 - Thermostat Installation Guide; Turn Off Power; Remove Old Thermostat

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