69-0959
5
T8501A,B,C,D MICROELECTRONIC THERMOSTATS
Mode Number
(Press
i
key
Factory-Setting
Other Choices
(Press
▲
or
▼
key to change)
Select
to change)
Display
Description
Display
Description
Not used
01
—
—
—
—
Fan operation
a
02
00
Conventional applica-
tions where equipment
controls fan operation in
heat mode
01
Heat pump and electric heat
applications where thermostat
controls fan operation in heat
mode
Not used
03
—
—
—
—
Heating cycle rate 04
06
6 cph used for
conventional systems
01, 03,
or 09
01—1 cph used for radiant floor
heat, gravity systems
03—3 cph used for hot water
systems or high efficiency
furnaces
09—9 cph used for electric heat
systems
Not used
05 thru 11
—
—
—
—
Changeover
(T8501D only)
12
01
Automatic changeover
00
Manual changeover
The Installer Setup is used to customize the thermostat to
specific systems. Some of the options include temperature
display, changeover, minimum equipment on time and
minimum off time. Installer modes are listed in numerical
order in Table 2. The table includes all the configuration
options and the factory-settings available for the T8501.
IMPORTANT
The Installer Setup must be set correctly for the
HVAC equipment, thermostat and subbase to
operate properly.
A combination of key presses are required to use the
Installer Setup feature.
—
To enter the Installer Setup mode, press and hold the
Information
i
key with the increase
▲
and decrease
▼
keys until the first mode number is displayed. All
display segments appear for approximately three
seconds before the mode number is displayed. See
Figs. 11 and 12.
—
To advance to the next Installer Setup mode, press
the Information
i
key.
—
To change a setting, use the increase
▲
or de-
crease
▼
key.
—
To exit the Installer Setup mode, press and hold the
Information
i
key until the display returns to normal
(approximately three seconds). The display scrolls the
Mode Numbers backwards to get to the normal
display. The Installer Setup mode is automatically
exited if no key presses are made for five minutes.
NOTE: Only configurable Mode Numbers are shown.
Fig. 11. Display of all the segments of the LCD.
Fig. 12. Display of Installer Setup mode and setting.
CAUTION
Heat pump and electric heat systems must be
configured to 01 in Installer Setup mode 02 to
prevent equipment damage caused by the system
running without the fan.
Table 2. Thermostat Installer Setup Options.
a
Available on select models.
(Continued)
M10105
MODE NUMBER DISPLAY
(COLUMN 2 OF TABLE 2)
FACTORY SETTING OR
OTHER CHOICE DISPLAY
(COLUMN 3 OR 5 OF TABLE 2)
Em HeatOffCool Auto Only
Heat Cool
OnAuto
System
Fan
Room
Outdoor
Em Ht Temporary Setting
Wait
%Humid
Aux Ht
Remote
Repl
Batt
M4844