White-rodgers 1F95-1280 User Manual download pdf (Page 13)

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/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

F to 140

Indoor temperature range is 32

F to 99

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/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 thermostat 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.

Dual Fuel Temperature Setpoint

When the thermostat is conﬁ gured 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/Conﬁ guration

menu, items 26 or 27. With outdoor remote sensor installed

and enabled (menu item 27), the dual fuel temperature

setpoint can be set to a temperature of 5° through 50°. When

outdoor remote sensor is not installed (menu item 27), a

software logic based dual fuel number from 01 to 09 can be

selected.

After the dual fuel temperature setpoint is set and

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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White-rodgers 1F95-1280 User Manual Page 13

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