Table of Contents
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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.
Model
T8635L and W8835A,E
T8635L and W8635A
T8635L and W8635B
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.
® U.S. Registered Trademark
Copyright © 2003 Honeywell •
T8635L Microelectronic
Communicating Programmable
Table 1. T8635L Thermostat Description.
System
Heat-Cool or
Heat Pump
Heat-Cool
Heat Pump
• All Rights Reserved
a
Changeover
Automatic or
Heat-Off-Cool-Auto
Manual
Em. Ht
Automatic or
Heat-Off-Cool-Auto
Manual
Heat-Off-Cool-Auto
Em. Ht
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.
Thermostat
INSTALLATION INSTRUCTIONS
a
System Selection
On-Auto
On-Auto
Fan Selection
69-1331-5
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Table of Contents
Related Manuals for Honeywell T8635L
Summary of Contents for Honeywell T8635L
- Page 1 INSTALLATION INSTRUCTIONS 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.
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Page 2: Wallplate Installation
T8635L MICROELECTRONIC COMMUNICATING PROGRAMMABLE THERMOSTAT 5 FEET [1.5 METERS] M10106 Fig. 1. Selecting thermostat location. Do not install the thermostat where it can be affected by: — drafts or dead spots behind doors and in corners. — hot or cold air from ducts. - Page 3 T8635L MICROELECTRONIC COMMUNICATING PROGRAMMABLE THERMOSTAT CAUTION FOR WRAPAROUND FOR STRAIGHT INSERTION Voltage Hazard. INSERTION STRIP STRIP 5/16 IN. (8 MM). 7/16 IN. (11 MM). Can cause electrical shock or equipment damage. Disconnect power before beginning installation. M4826 1. Loosen the terminal screws on the wallplate and Fig.
- Page 4 JUMPERS. Power-closed/ Spring-open (Model ARD) M13430B Fig. 7. T8635L/W8703A/W8635A with Outdoor Temperature Sensor. IMPORTANT Connect outdoor sensor to only one thermo- stat and configure that thermostat Installer Setup No. 45 to 1. See Table 6. Connecting more than one outdoor sensor or configuring...
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Page 5: Mounting Thermostat On Wallplate
T8635L MICROELECTRONIC COMMUNICATING PROGRAMMABLE THERMOSTAT Single transformer heating/cooling systems require a jumper to be installed connecting R and R HEAT COOL PURGE EM. HT. COMM ZONE 1 ZONE 2 ZONE 3 (factory installed). PURGE DISCOVERY BOOT OVERRIDE HVAC Equipment HP Fault... -
Page 6: Thermostat Keys
Heat: The thermostat controls the heating. When the thermostat is calling for heat, a IMPORTANT indicated in the display. • The T8635L has an adjustable compressor protection setting it can be set from 0 to 5 Cool: The thermostat controls the cooling. When minutes. -
Page 7: Temperature Settings
T8635L MICROELECTRONIC COMMUNICATING PROGRAMMABLE THERMOSTAT Em.Ht: Emergency Heat output is controlled as a. Press the Fan key during normal operation to stage 1 heat. Cooling system is off, and change the fan setting only for the current pro- compressor is de-energized. Em.Ht and gram period. -
Page 8: Installer Setup
— Global: All thermostats are affected by the change. Zoning The installer can use the Installer Setup options to change factory settings to customize installations. See Using the T8635L in a zoned application enables these Table 6. features: — Time synchronization. -
Page 9: Stage Configuration
— see Table 5 for typical cycle rate settings. pressed. — enter Installer Setup and select the desired cycle — The W8635 EIM transmits information to T8635L rate settings for each stage. (All stages can be set Thermostat that indicates maximum number of between 1 and 12 cph.) -
Page 10: Backlight Option
Backlight Option — all display segments appear for approximately three seconds before Installer Setup No.1 is displayed. The T8635L has a backlight that is activated: — see Fig. 15 and 16. — on-demand: the thermostat is pre-set to turn on the backlight when any key is pressed. - Page 11 T8635L MICROELECTRONIC COMMUNICATING PROGRAMMABLE THERMOSTAT Table 6. Installer Setup Numbers and Default Settings and Options. (Continued) Installer Setup Number (Press Other Options (Press Default Setting key to change key to change) Description Scope Display Description Display Description Number of heating...
- Page 12 T8635L MICROELECTRONIC COMMUNICATING PROGRAMMABLE THERMOSTAT Table 6. Installer Setup Numbers and Default Settings and Options. (Continued) Installer Setup Number (Press Other Options (Press Default Setting key to change key to change) Description Scope Display Description Display Description Field calibration Local...
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Page 13: Setting Current Day And Time
T8635L MICROELECTRONIC COMMUNICATING PROGRAMMABLE THERMOSTAT Table 7. Advanced Setup Options. (For reference only. Do not change any of these settings.) Advanced Installer Setup Number (Press Other Options Press Default Setting key to change) key to change) Description Display Description Display... -
Page 14: Installer System Test
T8635L MICROELECTRONIC COMMUNICATING PROGRAMMABLE THERMOSTAT INSTALLER SYSTEM TEST 3. Press until the current time is dis- played. Use the Installer System Test to check the thermostat Time and W8635 Equipment Interface Module operation for Set Day/Time each thermostat in the system. Table 8 lists the avail- able system tests. -
Page 15: Outdoor Temperature Sensor
T8635L MICROELECTRONIC COMMUNICATING PROGRAMMABLE THERMOSTAT Table 9. Installer System Test Options. (Continued) Key to Press Test Number Description Emergency Heat System Test (available only when using W8635B) Enter Emergency Heat Equipment system test. Emergency Heat turns on. Emergency Heat turns off. - Page 16 T8635L MICROELECTRONIC COMMUNICATING PROGRAMMABLE THERMOSTAT Table 10. Troubleshooting Information. Symptom Possible Cause Action Display does not Thermostat is not being powered. Check if the thermostat is mounted and latched on the come on. wallplate; if not: —mount and latch the thermostat on the wallplate.
- Page 17 T8635L MICROELECTRONIC COMMUNICATING PROGRAMMABLE THERMOSTAT Table 10. Troubleshooting Information. (Continued) Symptom Possible Cause Action Cooling does not Communication is not being End and repeat the call for cool. Check the Flash Com OK come on. System completed. LED on the W8635 EIM or W8835 while the call is being made.
- Page 18 T8635L MICROELECTRONIC COMMUNICATING PROGRAMMABLE THERMOSTAT Table 10. Troubleshooting Information. (Continued) Symptom Possible Cause Action Outdoor Outdoor temperature setting is not Install one C7089B Outdoor Temperature Sensor to OT temperature not enabled in Installer Setup. terminals on one thermostat in the system and configure displayed or is Installer Setup No.
- Page 19 T8635L MICROELECTRONIC COMMUNICATING PROGRAMMABLE THERMOSTAT 69-1331—5...
- Page 20 T8635L MICROELECTRONIC COMMUNICATING PROGRAMMABLE THERMOSTAT Automation and Control Solutions Honeywell International Inc. Honeywell Limited-Honeywell Limitée 1985 Douglas Drive North 35 Dynamic Drive Golden Valley MN 55422 Scarborough, Ontario M1V 4Z9 69-1331—5 G.H. Rev. 02-03 Printed in Taiwan R.O.C. www.honeywell.com/yourhome...