T8501 MICROELECTRONIC THERMOSTATS
7 69-0925—4
INSTALLER SYSTEM TEST
Use the Installer System Test to check the thermostat
operation. Refer to Table 3 for a list of the available
system tests.
CAUTION
Equipment Damage Hazard.
Minimum off time for compressor is bypassed
during Installer System Test.
Prevent compressor from cycling too quickly.
To start the system test:
Press and hold the increase ! and decrease # keys at
the same time until two zeros (00) appear. All segments
of the LCD are displayed before 00 appears.
See Fig. 11 and 12.
Fig. 12. Display of all LCD segments.
Fig. 13. Display of test number.
Refer to Table 4 for the directions and results of the
specific tests.
IMPORTANT
Models with System and Fan switches must set
the switches to the equipment that is being
checked for the equipment to operate.
NOTE: Press and hold the increase ! and decrease #
keys for three seconds to exit the system test
mode. The system test times out after five min-
utes without any key presses.
Table 3. Tests Available In Installer System Test.
Test
Number System Test Description
10-19 Heating equipment can be turned on a nd
off.
30-39 Cooling equipment can be turned on and
off.
40-49 Fan equipment can be turned on an d off.
60 0 to
60 19
Keyboard keys test.
70-79 Thermostat information including date
code and software versions are displayed.

Em HeatOffCool Auto Only

Heat Cool

OnAuto

System Fan

Room

Outdoor

Em Ht Temporary Setting

Wait

%Humid

Aux Ht Remote

Repl

Batt

M4844
M6792A
TEST NUMBER
Table 4. Installer System-Test Options.
Keys to
Press
Test
Number Description
Heating Equipment System-Test
i10 Enter heating equipment system-test. (Set System switch to Heat on switch models.)
!11 Heat comes on. When Installer Setup number 02 is 01, the system fan is also energized.
#10 Heat and system fan turn off.
Cooling Equipment System Test
i30 Change from heating to cooling equipment system test. (Set system switch to Cool on
switch models.)
!31 Cool and system fan come on.
#30 Cool and system fan turn off.
Fan Equipment System Test (T8501D only)
i40 Change from cooling to fan equipment system-test.
!41 Fan comes on.
#40 Fan turns off.