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INSTALLATION INSTRUCTIONS
69-1331-5
T8635L Microelectronic
Communicating Programmable
Thermostat
APPLICATION
The T8635L is a microelectronic communicating programmable thermostat that supports single-stage or multi-stage
conventional and heat pump applications when used with the W8835 (3H/2C) or W8635A (up to 2H/2C conven-
tional) or W8635B (up to 2H/1C heat pump) Equipment Interface Module (EIM). See Table 1.
Table 1. T8635L Thermostat Description.
a
See System and Fan Keys section for specific information.
Accessories
Required (Not Included)
W8835A,E EnviraZone Panel – For up to 3H/2C con-
ventional or heat pump applications.
W8635A – Equipment Interface Module (EIM) for up to
2H/2C conventional applications.
W8635B – Equipment Interface Module (EIM) for up to
2H/1C heat pump applications.
Optional
W8703A – Damper Interface Module.
C7089B – Outdoor Temperature Sensor.
C7835A – Discharge Air Temperature Sensor.
MERCURY NOTICE
If this control is replacing a control that contains
mercury in a sealed tube, do not place your old
control in the trash. Dispose of properly.
Contact your local waste management authority
for instructions regarding recycling and the
proper disposal of an old control.
INSTALLATION
When Installing this Product…
1. Read these instructions carefully. Failure to follow
these instructions can damage the product or
cause a hazardous condition.
2. Check the ratings given in the instructions and on
the product to make sure the product is suitable
for your application.
3. Installer must be a trained, experienced service
technician.
4. After completing installation, use these instruc-
tions to check out the product operation.
CAUTION
Voltage Hazard.
Can cause electrical shock or equipment
damage.
Disconnect power before beginning installation.
Location
Install the thermostat about 5 ft. (1.5m) above the floor
in an area with good circulation at average temperature.
See Fig 1.
Model System Changeover
a
System Selection
a
Fan Selection
T8635L and W8835A,E Heat-Cool or
Heat Pump
Automatic or
Manual
Heat-Off-Cool-Auto
Em. Ht
On-Auto
T8635L and W8635A Heat-Cool Automatic or
Manual
Heat-Off-Cool-Auto On-Auto
T8635L and W8635B Heat Pump
Heat-Off-Cool-Auto
Em. Ht
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