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Features
Cycle Rate
The selected number of system cycles per hour. If the cycle
rate were set to 3, each cycle would be 20 minutes long. The
total ON and/or OFF times depends on actual indoor space
load. A shorter cycle rate (more cycles per hour) may be
desired for Heating in order to maintain a tighter control on
indoor setpoint. A longer cycle rate may be desirable for
Cooling so the system has the opportunity to remove
moisture from the air and improve indoor comfort.
Auto Changeover
When the system mode is set to AUTO, the control automati-
cally switches between heating and cooling modes to
maintain the desired comfort level.
Setpoint Deadband
The number of degrees separating Heating and Cooling
setpoints. The amount of separation between mode
setpoints is user defined between 2 and 10 degrees. When
the control is set to Auto, and the cooling setpoint is
changed to a cooler setting, the heating setpoint also
changes to maintain the selected degrees separation. The
same action occurs when the heating setpoint is changed to
a warmer temperature.
Backlit Display & Keys
The liquid crystal display and the keypad will illuminate
whenever a keypad button is pressed to improve control
visibility. The back light stays on for 10 seconds after the
last key press.
Cooling Droop
Cooling Droop is an automatic function that cycles the
compressor on to improve indoor comfort by removing
moisture from the air. The Droop cycle is activated when
temperature is at or below the cooling temperature
setpoint. When this function is active, the control will
control temperature at 1 or 2 degrees below cooling
setpoint. The Droop cycle is deactivated when the tempera-
ture rises above the cooling setpoint.
Energy Savings
The Energy Savings mode provides instant energy savings
by offsetting the indoor setpoint to a cooler temperature
setting for heating and a warmer temperature setting for
cooling.
The Energy Savings mode is activated by pressing the
Energy Savings key "$" on the controls keypad. Pressing
the Energy Savings key "$" again deactivates the Energy
Savings mode. Pressing and holding the Energy Savings
key "$" provides quick access to the setpoint offset for both
heating and cooling.
Filter Reminder
"FILTER" will automatically flash to remind the home-
owner that its time to change the filter once the preset time
has expired. Pressing the "Filter" keypad button automati-
cally resets the internal clock timer. Once the timer has
been reset, the number of days remaining till the next
filter change can easily be determined by simply pressing
the "Filter" keypad button. Pressing and holding the
"Filter" keypad button provides quick access to the filter
timer value.
Pub. No. 18-HD29D1-3
Installer's Guide
Keypad Lock
Locking the control's keypad can help prevent unwanted
tampering or changing the thermostat settings by pressing
the controls UP and DOWN arrow keypad buttons at the
same time and holding for 2 seconds. "Keypad Locked" will
be displayed on the LCD. Repeating this combination
unlocks the keypad and the "Keypad Locked" will disap-
pear.
Business Card Drawer
The drawer attached to the mounting base of the control is
designed to provide a convenient location for the home
owner to locate their local servicer. A standard business
card can be folded and inserted into the slot on the drawer
to remind the User whom to call when service is required.
LitePort
LitePort is a patented feature that allows the servicer
access to extended real-time and history data events stored
in the thermostat's memory.
Manual Test Mode
The built-in Manual Test Mode allows the servicer to
quickly and easily test the control's individual control
outputs and makes diagnostic procedures a snap.
Set the Mode to OFF, set the Fan to AUTO, and press the
MODE and DOWN arrow keypad buttons at the same time
and hold for 2 seconds. See Table 1, steps 70-78 for details.
Default Factory Settings
The thermostat is shipped with a set of factory default
settings. The factory default settings can be restored at any
time using the control configuration menu. See Table 2,
step 99.
Service Indicator
The "SERVICE" indicator automatically flashes when an
internal fault or error has been detected by the thermostat.
Minimum Off Time Delay Override
Minimum Off time delays can be overridden for the current
cycle by pressing the Mode and Down arrow keys at the
same time for approximately 2 seconds. It may be neces-
sary to lower the indoor setpoint for cooling or increase the
setpoint for heating to activate the system. Minimum off
time delays will be enforced on the next cycle.
Wait Indicator
"Waiting" will illuminate when the indoor setpoint is
moved in the direction of calling for additional system
capacity. "Waiting" indicates system time delays are being
enforced and that the control is adjusting to the new
settings.
Calibrate Indoor Temperature
This option allows calibration (or deliberate miscalibration)
of the room temperature sensor. The selected number is
number of degrees, plus or minus, which will be added to
actual temperature. The number can range between + 5
and - 5 degrees in 1/2 degree increments. Factory default is
0. This adjusted value will be used as actual temperature
for both display and control action. For example, if 2 is
selected, 72 degrees actual will read 74 degrees.
Control Response Rate
A set of higher gain Proportional-Integral control constants
can be chosen to increase the responsiveness of the tem-
perature control performance.
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