Honeywell t8501A Installation Instructions Manual page 5

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
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
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.
Mode Number
(Press i key
to change)
Select
Not used 01
a
Fan operation 02
Not used 03
Heating cycle rate 04
Not used 05 thru 11
Changeover 12
(T8501D only)
a
Available on select models.
T8501A,B,C,D MICROELECTRONIC THERMOSTATS
and decrease
or de-
Table 2. Thermostat Installer Setup Options.
Factory-Setting
Display Description
— —
00 Conventional applica-
tions where equipment
controls fan operation in
heat mode
— —
06 6 cph used for
conventional systems
— —
01 Automatic changeover
5
Em Ht Temporary Setting
Aux Ht
Repl
Wait
Batt
System
Em HeatOffCool Auto Only
Fig. 11. Display of all the segments of the LCD.
MODE NUMBER DISPLAY
(COLUMN 2 OF TABLE 2)
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.
(Press
Display
— —
01 Heat pump and electric heat
applications where thermostat
controls fan operation in heat
mode
— —
01, 03, 01—1 cph used for radiant floor
or 09 heat, gravity systems
03—3 cph used for hot water
systems or high efficiency
furnaces
09—9 cph used for electric heat
systems
— —
00 Manual changeover
Remote
Room
%Humid
Outdoor
Heat Cool
Fan
OnAuto
M4844
FACTORY SETTING OR
OTHER CHOICE DISPLAY
(COLUMN 3 OR 5 OF TABLE 2)
M10105
Other Choices
or key to change)
Description
(Continued)
69-0959