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Programming – White Rodgers 1F95-1291 User Manual

Page 15

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15

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 27.
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°

PROGRAMMING

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 28 or 29. With outdoor remote sensor installed
and enabled, the dual fuel temperature setpoint (menu item
29) 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 28) 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.

Blower Balance Point for Heating

Requires DHM connection from thermostat to heat pump
system. Air to air heat pumps use a fast fan speed to circu-
late warm air for first stage heating. As outdoor temperatures
drop, the heat pump produces less heat and a high fan speed
makes the air from the ducts feel cooler. Blower Balance Point
allows you to select an outdoor temperature to slow the fan
speed so the air from the duct feels warmer. Select an out-
door temperature where the air from the ducts starts to feel
cool (Installer Configuration Menu item 31). When the outdoor
temperature drops to the selected temperature, the thermo-
stat will slow the fan speed so the outlet air feels warmer.