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 —
For the three speed fan coil there are
three continuous fan speeds. Pressing the
fan
button will cycle
through the following selections, fan low speed (F1), fan medi-
um speed (F2), and fan high speed (F3) or Fan Auto if in the
unoccupied mode. The F1, F2 or F3 fan speed indications are
displayed in the heat set point location. The fan will operate
continuously when in F1 - F3. When the fan is in auto (during
the unoccupied mode), the fan only runs when the equipment is
running.
NOTE: If the thermostat is set up as a two-pipe auto fan coil
system (2A) with electric heat, it has only two relays to drive
the fan speeds so the available fan speeds are either low or
high. The display will show F1 for low fan speed and F3 for
high fan speed. For fan coil applications of either two-pipe
cool only or two-pipe auto fan coil systems (2C and 2A), the
fan speed is high when the electric heat is energized regardless
of the user setting.
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.
Using Emergency Heat —
Emergency heat is used
when the heat system cannot keep up with demand. If Emer-
gency Heat has been configured by the installer, it is used if the
primary heat source fails. To set your thermostat to use emer-
gency 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
