13
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). Ter, 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 20.
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,
Loc On
, or the remote sensor
Loc 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
Weighing of Remote Reading:
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
or
but-
tons 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 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 an outside remote sensor is installed and enabled, the
thermostat can monitor the outside temperature to determine
when to switch to auxiliary heat and shut down the compres-
sor. This eliminates the need for a fossil fuel kit.
The Compressor Off temperature (CO) set in the configura-
tion menu, item 25, will determine when the auxiliary heat
will start and the compressor will shut off. Default setting is
05° (feature disabled) and can be set for 06 to 50°. When the
outside temperature falls to the selected temperature, the
auxiliary heat system will begin.
The auxiliary heat system can be fossil fuel (dF) or electric
heat (EA). This is selected after CO is set greater than 05. If
the auxiliary heat is fossil fuel, (df), a delay time for the com-
pressor shut down (Cd) can be selected. Default for this delay
is 60 seconds but can be set from 0 to 99 seconds. If EA is
selected, there is no selection for Cd because the compres-
sor will shut down immediately.
Summary of Contents for White Rodgers 1F95-0680
Page 15: ...15 NOTES ...
