14
PROGRAMMING
Dual Fuel Settings
Menu Reference Options Setting
1 HP1 or HP2 HP1 or HP2
25 Remote ON
Outdoor Remote
26 DF 5-50 Selectable
27 AO 35-80 Selectable
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/Confi guration
menu, item 25.
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 to 140
o
F
Indoor temperature range is 32
o
F to 99
o
F
Weight of Remote Reading
The thermostat is designed to receive the temperature of
the indoor remote sensor and average, or weight, it 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/Confi guration 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 local sensor is fi xed.
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 infl uence in the calculated temperature average than
the local sensor and the low weight selection caused the
remote sensor to have less infl uence.
Call for Service Indicator
"Call for Service" indicates a compressor fault. "Call for "Ser-
vice" will be on continuously when the L terminal is energized.
"Call for Service" will fl ash at the same rate as the L terminal
input signal, indicating a fault code.
Dual Fuel Temperature Setpoint
When the thermostat is confi gured for Heat Pump mode and
an outside remote sensor is installed, the thermostat can
monitor the outside temperature. When the outside tempera-
ture falls below a user selectable temperature, the thermostat
will 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/Confi guration
menu, item 26. The dual fuel temperature setpoint can be
set to a temperature of 5 through 50. A selection of 5 (default
setting) disables this feature and menu selection of Cd will not
be available.
After the dual fuel temperature setpoint is set above 5 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 fi rst three seconds and double the speed after
three seconds.
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