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
02
01
Heat pump and electric
heat applications where
thermostat controls fan
operation in heat mode.
00
Conventional applications where
equipment controls fan operation
in heat mode.
Not used
03
—
—
—
—
Heating cycle
rate
04
03
3 cph used for
conventional systems
01, 06,
or 09
01—1 cph used for radiant floor
heat, gravity systems
06—6 cph used for conventional
systems.
09—9 cph used for electric heat
systems
Not used
05 thru 11
—
—
—
—
Changeover
(T8501D only)
12
00
Automatic changeover
01
Manual changeover
Not used
13
—
—
—
—
Degree
temperature
display
14
00
Temperature is
displayed in °F
01
Temperature is displayed in °C
Not used
15 thru 18
—
—
—
—
Extended fan
operation in
heating
a
19
01
Fan operation is
extended 90 seconds
after the call for heat
ends.
00
No extended fan operation after
the call for heat ends
Extended fan
operation in
cooling
20
01
Fan operation is
extended 90 seconds
after the call for cool
ends
00
No extended fan operation after
the call for cool ends
Not used
21 thru 23
—
—
—
—
Outdoor
temperature
display
24
00
No outdoor temperature
is displayed
01
Outdoor temperature is displayed.
Needs a C7089B1000 Outdoor
Sensor to operate.
a Mode 02 must be set to 01 to extend fan operation.
69-1312-1
INSTALLATION INSTRUCTIONS
®U.S. Registered Trademark
ATA11H01
Microelectronic Thermostat
T8501D1087
Use form 69-0959 except use Table 2 and the hookup diagrams that follow.
Table 2. Thermostat installer setup options.
(continued)
