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Button Operation
Mode Button
The Mode button selects between Auto,
Cool, Heat, Vent and Off.
Heat Mode: The heating system operates
to maintain the Set Room temperature.
The fan may turn on with the heating
if the setting is selected.
Cool Mode: The cooling system operates to maintain
the Set Room temperature. The fan operates whenever
the cooling is on.
Auto Mode: The heating system operates to maintain the
Set Room Heat temperature. Likewise the cooling system
operates to maintain the Set Room Cool temperature.
The Set Room Heat and the Set Room Cool settings
must always be at least 3°F (1.5°C) apart. Should the
Heat setpoint be raised within 3°F (1.5°C) of the Cool
setpoint, the Cool setpoint is automatically adjusted
higher. Likewise, if the Cool setpoint is lowered within
3°F (1.5°C) of the Heat setpoint, the Heat setpoint is
automatically adjusted lower.
To switch from heating to cooling, the heat must be off
for at least a 30 minute interlock period and the Room
temperature must exceed 3°F (1.5°C) above the Set
Room Heat temperature.
To switch from cooling to heating, the cooling must be off
for at least a 30 minute interlock period and the Room
temperature must exceed 3°F (1.5°C) below the Set Room
Cool temperature. Cooling has priority over heating.
The fan operates whenever the cooling is on. The fan will
turn on with the heating if fan mode 2 is selected.
Setting the Temperature
Room Temperature
Press the
or the
button to select the room temperature.
The display indicates whether the "HEAT" or the "COOL"
temperature is being changed.
F
If in Auto mode, press the Mode button to toggle between
Heat or Cool temperature adjustment.
© 2008
D 540e - 02/08
Use the
or
button to adjust
temperature.
4 of 12
Vent Mode: Only the fan operates to circulate air. The
heating and cooling are not operated.
Off Mode: The heating, cooling, and fan are shut off
except heating for freeze protection.
Button
The
button raises the Set Room
temperature. When in Ventilation mode,
the
button increases the Set Fan
percentage.
Button
The
button lowers the Set Room
temperature. When in Ventilation mode,
the
button decreases the Set Fan
percentage.
Local Override
The Local Override (
changes between the local override
temperatures.
The option is permanent , permanent ,
or follow the programmable schedule .
Programmable Schedule
When operating on a programmable schedule, a
is shown, as well as a
the current operating temperature.
Press the Local Override (
to operate on a programmable schedule.
If a
symbol does not appear, there is no schedule
available.
Display
Action
Manual override at occupied temperature.
Manual override at unoccupied temperature.
Programmable schedule at occupied
temperature.
Programmable schedule at unoccupied
temperature.
Button
) button
symbol
or a
. The
or
indicates
) button to select the
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