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sensed in one of three ways: the local sensor (L) located on the
thermostat, the remote sensor (r), or the average of local and
remote sensors (Lr).
Selection: L, r, Lr
L — Local sensor: The onboard thermistor is the control
point for the temperature control algorithm.
r — Remote space sensor: The remote space temperature
is the control point for the temperature control algorithm.
NOTE: This selection is only available if Option 02 indi-
cates that the S1, S2 terminals are sensing a remote space
temperature.
Lr — Average (remote space sensor and space tempera-
ture): The average of the onboard thermistor and the
remote space sensor is the control point for the tempera-
ture control algorithm.
NOTE: This selection is only available if Option 02 indi-
cates that the S1, S2 terminals are sensing a remote space
temperature.
Default: L
OPTION 07 — EQUIPMENT DDC CONTROLLER —
This selection should be set to ON when control is to be used
with DDC (direct digital controller) equipment. These control
systems will take care of the time guard and cycle timers.
Examples are zone controlling units or two-position valve
assemblies that can open or close as required, without regard to
exceeding a maximum number of operations per hour. Rooftop
units used with PremierLink™ or ComfortLink controls do not
require thermostat control to handle timers and safeties, so this
selection would also be set to ON in this case.
Set this selection to OF (off) if the thermostat is directly
connected to equipment such as a furnace or fan coil unit with
DX condensing units, or electro-mechanical rooftop units that
have a maximum number of cycles per hour rating, but do not
implement that requirement themselves and rely instead on the
thermostat.
Selection: OF(F), ON
OF — Timeguard and cycle timers are enabled
ON — Timeguard and cycle timers are disabled
Default: OF (off)
OPTION 10 — REVERSING VALVE — This feature is
only available on heat pump (HP) systems. Although the water
source heat pump is also a heat pump system, a WSHP system
will always energize the reversing valve in cooling and there-
fore, this option is not available to the installer on either 35 or
WSHP systems.
The "O/B" terminal can be configured to be energized in ei-
ther heating mode or in cooling mode, depending on heat pump
operation. The "C" configuration is used to describe a heat
pump system that energizes its reversing valve in cooling. The
"H" configuration is used to describe a heat pump system that
energizes its reversing valve in heating.
Selection: H, C
H — The reversing value output (O/B) is energized when
HEAT mode is selected.
C — The reversing value output (O/B) is energized when
COOL mode is selected.
Default: H
OPTION 11 — DEADBAND BETWEEN HEATING AND
COOLING SET POINTS — The selection allows the install-
er to choose how much differential will exist between the heat-
ing and cooling set points.
Selection: 1 to 10 (F or C)
Default: 5
OPTION 13 — SPACE TEMPERATURE DISPLAY
ADJUSTMENT (OFFSET) — This configuration is the
number of degrees to be added to the displayed temperature to
calibrate or deliberately miscalibrate the measured space
tem-
perature. This selection is not available to the installer if Option
39 is set to SP (setpoint display).
Selection: –5 to 5 F (always in F)
Default: 0
OPTION 15 — AUTO MODE AVAILABILITY — The
ON selection will allow automatic changeover between heating
and cooling as demand requires a mode selection. OF
maintains either heating or cooling mode selection only. Auto
changeover is not available when H or C is selected under Op-
tion 01.
Selection: ON, OF(F)
ON — Auto mode is an available option that can be
selected
OF — Auto mode is not an available option
Default: ON
OPTION 16 — MAX CYCLES PER HOUR — The maxi-
mum cycle rate is limited by internal timers to the selected
number of cycles per hour. Selection of a higher number causes
faster cycling resulting in more constant room temperature.
Selection: 4, 6, 8
4 — The Y1 and W outputs will be energized at most
twice per hour. When an output is energized, it will not
be energized again for 15 minutes.
6 — The Y1 and W outputs will be energized at most
four times per hour. When an output is energized, it will
not be energized again for 10 minutes.
8 — The Y1 and W outputs will be energized at most six
times per hour. When an output is energized, it will not
be energized again for 8 minutes.
Default: 4
OPTION 17 — TIME BETWEEN EQUIPMENT
STAGES — This configuration determines the minimum
number of minutes of equipment operation before allowing the
transition to the next logical stage.
Selection: 10, 15, 20, 25
Default: 15
NOTE: If the difference between the space air temperature and
set point results in a demand greater than three degrees, then
the staging timers are ignored and the equipment will stage up
in 60-second increments.
OPTION 18 — BACKLIGHT CONFIGURATION — This
function is only available when the thermostat is operating
from 24 volt AC power connected to the R and C terminals. It
is not available when the thermostat operates from batteries.
When set to OF (off), the backlight will be lit for 10 seconds
after a button is pressed. After 10 seconds of no button presses,
the backlight turns off.
When ON is enabled, the backlight will normally be on and
dim in appearance. The backlight brightness becomes brighter
when a button is pressed. After 10 seconds of no button press-
es, the backlight will return to the dimmer level until another
button press occurs.
Selection: OF(F), ON
Default: ON with 24 vac power; for batteries only,
default is OFF.
OPTION 20 — OUTDOOR AIR TEMPERATURE DIS-
PLAY ADJUSTMENT (OFFSET) — This selection is not
available unless Option 02 is set to Od (outdoor air tempera-
ture) and a valid sensor is connected to S1 and S2 terminals. It
allows the calibration, or deliberate miscalibration of the out-
door air temperature sensor reading.
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