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Em.Ht: Emergency Heat output is controlled as
stage 1 heat. Cooling system is off, and
compressor is de-energized. Em.Ht and
are displayed when the thermostat is
calling for emergency heat.
2. Use the Fan key setting (Fig. 12) to control the
system fan:
Auto:
The fan operates with the heating and
cooling equipment.
On:
The fan temporarily operates continu-
ously for the current program period. The
is displayed any time the thermostat is
calling for fan operation.
NOTE: When used with the W8835 or W8703A
Damper Interface Module, a flashing
is displayed when one thermostat is call-
ing for fan operation while a thermostat
in another zone is calling for heat or
cool. After the call ends from the other
thermostat, the
the re-quested call for fan is honored for
this zone.
Period
Wake
Leave
Return
Sleep
LED Indicators
There are two LED indicators on the top right of the
thermostat. See Fig. 13.
• The check (red) LED lights when 24 volts are applied
to the L terminal on the W8635B EIM or W8835. This
indicates a problem with the heat pump equipment.
Action for Homeowner: Switch to emergency heat
and call for assistance.
• The filter (green) LED lights when the filter timer has
expired.
Action for Homeowner: Replace the furnace filter
or clean the electronic air cleaner cells. Press and
hold the Filter key to reset the counter and turn off
the LED.
CHECK
(RED) LED
Fig. 13. Check and filter LED locations.
T8635L MICROELECTRONIC COMMUNICATING PROGRAMMABLE THERMOSTAT
stops flashing and
Table 3. Default Program Settings.
Time
6:00 am
8:00 am
6:00 am
10:00 am
FILTER
(GREEN) LED
M13375
a. Press the Fan key during normal operation to
b. To program the fan to operate in Auto or On
Run
Set Current
Program
Day/Time
Time
Heat/Cool
Hold Temp
Day
Settings
Daylight
Copy
Time
Temperature Settings
To program the time and temperature settings:
1. Refer to Table 3 for the default program time and
temperature settings.
2. If the daytime energy savings period is not used,
press Leave or Return (period) until the time and
temperature is blank.
3. See Owner's Guide, 69-1332, for complete
instructions on changing the program.
Heat Setpoint
70°F (21°C)
62°F (16.5°C)
70°F (21°C)
62°F (16.5°C)
Filter Indication
This thermostat can track total fan and system run time.
This feature can be used to tell the homeowner when to
replace the furnace filter or clean the electronic air
cleaner cells:
1. Select the number of days for the filter timer to
count down from: 0, 15, 30, 60 or 120 days. (One
day represents 24 hours of continuous fan/system
run time.)
2. To activate this feature, select a value other
than 0.
3. See Owner's Guide, 69-1332, for more detailed
information.
Communication Code Numbers
Communication codes 1-3 provide equipment and com-
munication status after installation. Communication
codes 4-6 can be used during initial system zoning
installation when more than one thermostat is con-
nected. See Table 4.
7
change the fan setting only for the current pro-
gram period.
for each program period individually, see the
Owner's Guide, 69-1332.
Wake
Leave
Return
Sleep
Fan
Set Program
Filter
System
Fan
Fig. 12. Fan key setting.
Cool Setpoint
78°F (25.5°C)
85F (29.5°C)
78F (25.5°C)
82F (28°C)
Fan
On
Auto
M17766
Fan Setting
Auto
Auto
Auto
Auto
69-1331—5
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