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PROGRAMMING
Wired Remote Temperature Sensing
One remote temperature sensor can be installed indoor or
outdoor and connected to the thermostat by a maximum
cable length of 100 meters (300 feet). Terminals +, S and - on
the terminal block allow connection of the remote sensor.
The thermostat must have 24 VAC Common connection to
terminal C for the remote sensor to operate. The remote sen-
sor can be enabled or disabled in the Installer/Configuration
menu, item 26.
When remote sensor, Remote, is selected Off (factory de-
fault), no remote sensor is enabled. When remote sensor is
selected On, the next step is to select the remote as indoor,
Remote In, or outdoor, Remote Outdoor. If the remote is se-
lected as Remote In, an additional step will be to select if the
temperature shown on the display will be from the thermostat,
LS On, or the remote sensor LS Off.
In normal operation, when a remote sensor is enabled the
time digits of the display will alternate between the time and
the remote temperature for three seconds each. Above the
remote temperature will be Remote, for indoor sensor or
Outdoor Remote, for outdoor sensor. If the remote sensor is
an indoor sensor and the local display has been disabled, the
temperature displayed as the room temperature will be the
remote sensor temperature.
Sensing Range:
Outdoor temperature range is -40
o
F to 140
o
F
Indoor temperature range is 32
o
F to 99
o
F
Averaging or Weighting Remote Sensors
The thermostat will weight or average the temperature of the
indoor remote sensor with the local sensor in the thermostat
for each program period. The averaging will be active only
when the local sensor and the indoor remote sensor are both
functional and enabled in the Installer/Configuration menu.
When the thermostat is in the Set Schedule mode, the weight
of the indoor sensor will be shown in the current temperature
digits of the display. The weight will show as A2 (average and
default), H4 (high) or L1 (low). Pressing the and keys at
the same time will change the weight for the program period.
The weight of the thermostat sensor is fixed.
In normal operation of the thermostat, the current tempera-
ture displayed will be the weighted average of the local
sensor and the remote sensor using the formula (local sensor
weight x local sensor temperature) + (remote sensor weight x
remote sensor temperature) / (local sensor weight + remote
sensor weight).
Example: Local sensor temperature is 80° and the remote
sensor is 70°.
If weight is selected H4, the averaged temperature of 72° will
be displayed.
(1 x 80) + (4 x 70) / 5 = 72°
If weight is selected A2, the average temperature of 73° will
be displayed.
(1 x 80) + (2 x 70) / 3 = 73.3°
If weight is selected L1, the average temperature of 75° will
be displayed.
(1 x 80) + (1 x 70) / 2 = 75°
The example shows that the weight selected would prioritize
the overall averaged temperature between the two sensors.
The high weight selection caused the remote sensor to have
a higher influence in the calculated temperature average than
the local sensor and the low weight selection caused the
remote sensor to have less influence.
Dual Fuel Temperature Setpoint
When the thermostat is configured for Heat Pump mode and
the Dual Fuel feature is selected on, the thermostat can moni-
tor the outside temperature using remote sensor F145-1378
or use software logic to determine when to switch to gas heat
and shut down the compressor. This eliminates the need for a
fossil fuel kit.
The user selectable temperature is called the dual fuel tem-
perature setpoint, dF and is set in the Installer/Configuration
menu, items 32 or 33. With outdoor remote sensor installed
and enabled, the dual fuel temperature setpoint (menu item 33)
can be set to a temperature of 5° through 50°. When outdoor
remote sensor is not installed, a software logic based dual fuel
number (menu item 32) from 01 to 09 can be selected.
After the dual fuel temperature setpoint is set and
is
pressed, a delay, Cd, can be set for compressor shutdown
after the auxiliary stage is energized. This delay can be set
from 0 seconds to 99 seconds to minimize the time that the
system may blow cooler air until the alternate source of heat
comes on. Default setting for delay is 60. When setting the
delay, if the
or keys are held depressed, the setpoint
will increase or decrease at the rate of one degree every half
second for the first three seconds and double the speed after
three seconds.
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