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T8635L MICROELECTRONIC COMMUNICATING PROGRAMMABLE THERMOSTAT
Steam, Gravity
Hydronic Heat, Condensing Gas Furnaces
Gas or Oil Forced Air, Auxiliary Heat
Electric Heat, Emergency Heat
a
High efficiency furnace (90+).
Backlight Option
The T8635L has a backlight that is activated:
— on-demand: the thermostat is pre-set to turn on the
backlight when any key is pressed.
— continuously: set Installer Setup No. 44 to 1 for
applications where the display is difficult to read due
to poor lighting conditions.
Advanced Settings
These settings are automatically configured during Dis-
covery and should not be changed when using the
T8635L with the W8635A or W8635B EIM.
The advanced settings, see Table 7, are not available to
view or change when the ADV setting is set to Off.
When ADV is set to Off, press
beginning of the Installer Setup selections.
NOTE: If any of the settings in ADV are inadvertently
changed, press Enter and run Discovery mode
to reset the settings to the original selection.
ENTERING INSTALLER SETUP
To enter Installer Setup:
— simultaneously press and hold the
until Installer Setup No. 1 is displayed.
Table 6. Installer Setup Numbers and Default Settings and Options.
Installer
Setup
Number
(Press
key to
change)
Description
1
Zone number
LOC
Lock/Unlock the system
to Automatic Discovery
a
mode
dIS
Runs Automatic
Discovery mode.
4
Fan operation (only
when used with
W8635A).
69-1331—5
Table 5. Typical Heating Cycle Rate Settings.
System
a
, Compressor Stages
to scroll to the
,
and
keys
Default Setting
Scope
Display
Local
0
No zoning.
Global LOC
Automatic Discovery
off.
mode occurs.
Global dIS
Press the
start Automatic
Discovery mode.
Global 0
Conventional
applications where
equipment controls
fan operation in heat
mode.
— all display segments appear for approximately three
seconds before Installer Setup No.1 is displayed.
— see Fig. 15 and 16.
Wait
Set Program
Set Day/Time
Recovery
Hold for
Filter
Em Ht
Aux Ht
Days
Mon
Tue Wed Thu Fri Sat Sun
Wake Leave Return Sleep
Fig. 15. LCD segments display.
INSTALLER SETUP
NUMBER DISPLAY
(COLUMN 1 OF TABLE 5)
Fig. 16. Installer Setup number and setting display.
1. To advance to the next Installer Setup No., press
the
key.
2. To go back, press the
3. To change an Installer Setup, use the
4. To exit Installer Setup, press Run Program key.
Description
Display
1 to 9
LOC on
key to
—
1
10
Cycles Per Hour
1
3
6
9
Temporary Setting
AM
PM
Repl Batt
Room
Outdoor
Heat
Cool
DST
FACTORY SETTING OR OTHER
CHOICE DISPLAY (COLUMN 4
OR 5 OF TABLE 5)
key.
Other Options (Press
key to change
Description
Zone numbers can be set
to zones 1 through 9.
Automatic Discovery
mode does not occur.
—
Electric heat applications
where thermostat
controls fan operation in
heat mode.
System
Em Heat
Off
Cool
Auto
Fan
On
Auto
M14559
M13376
or
key.
or
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