4
Turning Heating and Cooling System Off —
To use the thermostat to turn the heating and cooling system
off, perform the following procedure:
1. Open the thermostat front panel door.
2. Press the
mode
button until the display shows "off" in the
upper left corner.
3. Close the thermostat door.
Advanced Programming —
The user can customize
two different features on the thermostat, the Fahrenheit or Cel-
sius display and the backlighting of the thermostat.
FAHRENHEIT OR CELSIUS DISPLAY — The thermostat
is preset to display the temperature in degrees Fahrenheit. The
user can change the display to Celsius if desired. To change the
display, perform the following procedure:
1. Open the thermostat front panel door.
2. Press and hold the
OCC
and
LIMIT
buttons simultane-
ously for three seconds. The screen will display flashing
"U2" and the F or C setting.
3. Press the
mode
button to change the flashing “U2” to the
F or C setting.
4. Press the
up
or
down
button to select either F or
C.
5. Press the
fan
or
done
button.
6. Close the thermostat door.
BACKLIGHTING — The thermostat can be set to have the
backlighting either Off or On. To change the backlighting se-
lection, perform the following:
1. Open the thermostat front panel door.
2. Press and hold the
OCC
and
LIMIT
buttons simultane-
ously for three seconds. The screen will display a flashing
"U2", press the up button to display the flashing "U3" and
the On or Off backlight setting.
3. Press the
mode
button to change the flashing “U3” to the
On (or Off).
4. Press the
up
or
down
button to select On or Off.
5. If Off is selected, the thermostat backlight will normally
be off. It will turn on with any button press and stay on for
10 seconds between button presses. After 10 seconds of
no button presses, the backlight turns off until another
button press occurs.
6. If On is selected, the thermostat backlight will normally
be on and dim in appearance. The backlight brightness
becomes brighter with any button press and remains
bright for 10 seconds. After 10 seconds of no button
presses, the backlight returns to a dimmer level until an-
other button press occurs.
7. To exit the user configuration screen, press the
fan
or the
done
button.
8. Close the thermostat door.
Using the Fan —
The thermostat is factory configured so
that the fan runs continuously (Fan On mode) during the occu-
pied or limit period. If the installer has configured the thermo-
stat to allow operation in the Fan Auto mode, the fan will run
only when heating or cooling is required. To change the fan set-
ting:
1. Open the thermostat front panel door.
2. Press the
fan
button on the left side. The fan on or fan
auto will appear in the lower left corner of the display.
3. Press the
fan
button again to change setting.
4. Close thermostat door.
Auto Changeover —
The thermostat displays one of
five modes: heat, cool, Em heat, heat cool (auto mode) and off.
When the mode selection is in auto mode, the system is al-
lowed to switch from heating to cooling or from cooling to
heating to maintain the temperature set points.
Unlocking the Keypad —
The thermostat is locked
when the padlock symbol is shown on the thermostat display.
A locked thermostat will inhibit a user from making adjust-
ments.
The method by which the thermostat is unlocked is config-
ured by the installer. Three unlocking options are available:
1. The user must simultaneously depress the
up
and
down
buttons for 5 seconds.
2. If a set of dashes are displayed, then a four-digit pass code
must be entered by the user.
3. The user must simultaneously depress the
up
and
down
buttons for 5 seconds, and then enter a four-digit pass
code.
Auxiliary Heat —
This option is available for all of the
equipment types except cool only. When the auxiliary heat is
active "aux heat" will be displayed and the supplemental heat is
used to meet the demand in the space. The heater will turn on
automatically.
Using Emergency Heat —
Emergency heat is used
when the heat system cannot keep up with demand. If the heat
pump compressor that works with auxiliary heat fails, or if the
heat pump is not working at all, the emergency heat can be
used. To set the thermostat to use emergency heat, perform the
following procedure:
1. Open the thermostat front panel door.
2. Press the
mode
button until the display shows Em Heat
in the upper left corner of the display.
3. Close the thermostat door.
Smart Recovery —
The Smart Recovery feature transi-
tions the space from one temperature period (P1 - P4) to the
next so that the space temperature matches the temperature set
point at the start of each time period. This means, for example,
that if the occupied period temperature setting is lower than the
period that precedes it, then the thermostat will start cooling
down the space before the beginning of the scheduled period.
The thermostat does this at an energy efficient rate. This not
only helps make the space as comfortable as possible, it also
makes thermostat usage more effective.
Power Outage —
If the building loses electricity, the
thermostat will not need to be reprogrammed. The settings are
retained in memory.
cool
hold
fan
auto
OCC
LIMIT
UNOCC
push and hold to set
set
schedule
days
period start time
set
clock
d/h/m
mode
fan
done
hold
run
Fig. 4 — Holding Temperature Set Points
a33-9219
