Thermostat Controls; Function Buttons; Display Screen - Honeywell RTHL3550 Owner's Manual

Thermostat controls

Digital display

Function buttons

Press to select the function displayed just above each
button. (Functions change depending on the task.)

Display screen

Current inside temperature
Fan setting
FAN
Press the button to
select Auto or On.
In "Auto" mode (the most commonly
used setting), the fan runs only when
the heating or cooling system is on. If
set to "On," the fan runs continuously.
MCR32585
Inside
Replace
Battery
Heat On
Fan
Auto
• Heat: Thermostat controls only the heating system.
• Cool: Thermostat controls only the cooling system.
• Auto: Thermostat automatically selects heating or
cooling depending on the indoor temperature.
• Off: Heating and cooling systems are off.
12
Battery holder
Temperature buttons
Press to adjust
temperature settings.
Temperature setting
Heat
System status
Indicates system is on.
(Cool On or Heat On.)
System
System setting
Heat
Press the
to select Heat, Cool or Off.
MCR32587
SYSTEM
button