Honeywell RTH8580ZW - Auto Changeover and System Options

33-00131ES—01 16
Auto changeover
This feature is used in climates where both
air conditioning and heating are used on the
same day.
When the system is set to AUTO,
the thermostat automatically
selects heating or cooling
depending on the indoor temperature.
Heat and cool settings must be at least
3 degrees apart. The thermostat will
automatically adjust settings to maintain this
3-degree separation.
Note: System setting function 0300 controls
Auto changeover. See “System setup” on
page 18.
Setting functions and options
You can change options for a number of system functions. Available functions depend on
the type of system you have. The functions, designated with four-digit numbers, along with
available options are described on pages 17–20.
This thermostat is pre-set for a single-stage heating/cooling system.
Setting function 0170 for a heat pump will adjust the default settings.
1 Press SYSTEM. You’ll see several blank buttons
on the bottom of the display.
2 Press and hold the buttons on either side of
the center button until the screen changes
(approximately 5 seconds).Cycle through the
functions, press st next to the four digit
number on the left.
3 As needed, change options for any function by
pressing st next to the number on the right.
4 When you have made all changes, press DONE
to save and exit.
DONE
TUE
Inside
Set To
70
0120
70
20
FAN
AUTO
SUN
SYSTEM
HEAT
DONE CANCEL
TUE
AM
Inside
Set To
70
6:01
70
FAN
AUTO
SYSTEM
HEAT
SUN