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T H E S M A R T S O L U T I O N F O R E N E R G Y E F F I C I E N C Y
ATA11U03
R e v. : 0 9 / 1 6 / 1 3
OPERATION
Mode Selection
— The mode button allows the user to
display the off, heat, cool, auto icons. Pressing the mode
button cycles through the available modes based on the
equipment selection from Option 15. Available choices
are listed in Table 2.
Table 2: Mode Selection
Fan Selection
— The thermostat offers two continuous
(ON) or two cycling (AUTO) and two fan speeds high (HI)
or low (LO). Pressing the fan button cycles through the
following displays fan on LO, fan on HI, auto fan LO, auto
fan HI.
Fan Display
— If Option 39 is set to display set point
(SP), then the two-speed fan setting remains on the
display. If the current fan speed is not shown on the
display, the first press of the fan button will display the
current selection. The fan selection can only be changed
by a fan button press when the current selection is shown
on the display. See Fig. 6.
If Option 39 is set to display the space temperature (St),
then the two-speed fan setting (LO or HI) remains on the
display for three seconds after the last press of the fan
button.
Figure 6: Current Fan Selection Display
Set Temperature Selection
— If auto mode is not
active and off mode is not active, pressing the up or
down button causes the set point corresponding to the
current system mode to be updated. If the up or down
button is held, the set point value will be scrolled. The
set point change also takes into account that Option 11
(deadband) is preserved along with ensuring that Option
26 (minimum cooling set point) and Option 27 (maximum
heating set point) are taken into account to enforce set
point limits.
If auto mode is active, pressing the up or down button
causes the set point corresponding to the current
operating mode to be updated. To move between the
heat and cool set points, press the mode button to
toggle between set points. Once the desired set point
has been adjusted, press the mode button to return to
auto mode.
If off mode is active, the up and down buttons are
ignored for changing set point(s).
When changing the set points, the following restrictions
are in place. The cool set point cannot be increased
above 90 degrees F (32 C) or decreased below Option
26, the minimum cooling set point. The heat set point
cannot be decreased below 50 F (10 C) or increased
above Option 27, the maximum heating set point.
When Option 39 is set to SP (set point), the set point
adjustment is displayed in the large space temperature
digits.
Display Lighting
— The display has two levels of
lighting, high level and low level. High level lighting
comes on for 10 seconds when buttons are being
pressed. The low level can be selected (see Option 18)
for continuous backlight.
Remote Sensor Temperature Display
— Pressing
the up and down buttons simultaneously displays the
temperature of the sensor connected to the S1 and S2
terminals for five seconds, then the thermostat returns to
normal operation.
If the sensor is invalid, then the display shows “--” in the
large temperature display digits.
OPTION 15
AVAILABLE MODES
On
Off, Heat Cool, Auto
Off
Off, Heat, Cool
