Honeywell T8635L, W8835A, W8835E, W8635A, W8635B Installation Instructions Manual

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Page 1

T8635L Microelectronic

Communicating Programmable

Thermostat

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 conventional) or W8635B (up to 2H/1C heat pump) Equipment Interface Module (EIM). See Table 1.

Table 1. T8635L Thermostat Description.

Model System Changeover

T8635L and W8835A,E Heat-Cool or

T8635L and W8635A Heat-Cool Automatic or

T8635L and W8635B Heat Pump

See System and Fan Keys section for specific information.

Heat Pump

Automatic or Manual

Manual

System Selection

Heat-Off-Cool-Auto Em. Ht

Heat-Off-Cool-Auto On-Auto

Heat-Off-Cool-Auto Em. Ht

Fan Selection

On-Auto

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 instructions to check out the product operation.

CAUTION

Vol tage Ha z a r d. 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.

69-1331-5

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T8635L MICROELECTRONIC COMMUNICATING PROGRAMMABLE THERMOSTAT

YES

5 FEET

[1.5 METERS]

Fig. 1. Selecting thermostat location.

M10106

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. — radiant heat from sun or appliances. — concealed pipes and chimneys. — unheated (uncooled) areas such as an outside wall

behind the thermostat.

Wallplate Installation

The thermostat can be mounted horizontally on the wall or on a 2 in. by 4 in. wiring box. Position wallplate horizontally on the wall or on a 2 in. by 4 in. wiring box.

1. Position and level the wallplate (for appearance only). The thermostat functions properly even when not level.

2. Use a pencil to mark the mounting holes. See Fig. 2.

3. Remove the wallplate from the wall and drill two 3/16-in. holes in the wall (if drywall) as marked. For firmer material such as plaster, drill two 7/32-in. holes. Gently tap anchors (provided) into the drilled holes until flush with the wall.

4. Position the wallplate over the holes, pulling the wires through the wiring opening.

5. Loosely insert the mounting screws in the holes.

6. Tighten the mounting screws.

WALL ANCHORS (2)

WALL

WIRES THROUGH WALL

Fig. 2. Mounting the wallplate.

MOUNTING HOLES

MOUNTING SCREWS

M6530A

69-1331—5 2

WIRING

All wiring must comply with local electrical codes and ordinances. See Fig. 5 through 8 wiring diagrams for specific equipment applications. Refer to Table 2 for terminal designations.

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T8635L MICROELECTRONIC COMMUNICATING PROGRAMMABLE THERMOSTAT

F I 7

CAUTION

Voltage Hazard. Can cause electrical shock or equipment

OR WRAPAROUND

NSERTION STRIP

/16 IN. (11 MM).

damage.

Disconnect power before beginning installation.

1. Loosen the terminal screws on the wallplate and connect the system wires. See Fig. 3 and 4.

Fig. 3. Correct wiring technique.

IMPORTANT

Use 18-gauge color-coded thermostat cable for proper wiring. Shielded cable is not required.

2. Securely tighten each terminal screw.

3. Push excess wire back in the hole.

WIRE NUT

4. Plug the hole in the wall with non-flammable insulation to help prevent drafts from adversely affecting thermostat operation.

Fig. 4. Using wire nut to pigtail a

connection when three or more wires

are terminated at one terminal.

Table 2. Terminal Designations.

T8635L Terminal Designations Function

1 Data – Connect to terminal 1 on W8835 or W8635.

2 Power – Connect to terminal 2 on W8835 or W8635.

3 Power – Connect to terminal 3 on W8835 or W8635.

Use optional C7089B Outdoor Temperature Sensor.

Outdoor Temperature Sensor

FOR STRAIGHT INSERTION STRIP 5/16 IN. (8 MM).

M482

M1337

L1 (HOT)

SYSTEM

TRANSFORMER

T8635L

C7089B OUTDOOR TEMPERATURE SENSOR

W8635A

FACTORY INSTALLER JUMPERS.

1 2 3

C R R

G W1 W2

Y1 Y2

Fig. 5. T8635L/W8635A with

Outdoor Temperature Sensor.

T8635L

C7089B OUTDOOR

SYSTEM

TEMPERATURE SENSOR

W8635B

FACTORY INSTALLER JUMPER.

FAN RELAY

HEAT 1 RELAY

HEAT 2 RELAY

COOL 1 RELAY

COOL 2 RELAY

M1342

L1 (HOT)

RANSFORMER

1 2 3

C R R

AUX

COMPRESSOR

MONITOR

FAN RELAY

COMP. RELAY

AUX. HT. RELAY

EM. HT. RELAY

COOL CHANGEOVER

HEAT CHANGEOVER

M1343

W1/Y1

Fig. 6. T8635L/W8635B with

Outdoor Temperature Sensor.

3 69-1331—5

Page 4

T8635L MICROELECTRONIC COMMUNICATING PROGRAMMABLE THERMOSTAT

)

T8635L

C7089B OUTDOOR TEMPERATURE SENSOR

L1 (HOT)

SYSTEM

RANSFORMER

FACTORY

INSTALLER

JUMPERS.

IMPORTANT

Connect outdoor sensor to only one thermostat and configure that thermostat Installer Setup No. 45 to 1. See Table 6. Connecting more than one outdoor sensor or configuring more than one thermostat for outdoor sensor causes the thermostat to incorrectly display the outdoor temperature.

W8635A

1 2 3

C R R

G W1 W2

Y1 Y2

FAN RELAY

HEAT 1 RELAY

HEAT 2 RELAY

COOL 1 RELAY

COOL 2 RELAY

546Z

213

MODEL AOBD

ZONE DAMPER

Power-closed/ Spring-open (Model ZD)

Power-closed/ Spring-open (Model ARD)

W8703A

OPEN CLOSE

Fig. 7. T8635L/W8703A/W8635A with Outdoor Temperature Sensor.

ZONE AZONE B

TR1 TR2

COM

ZONE C

1 2

L1 (HOT

EXTERNAL 40 VA TRANSFORME

M13430

69-1331—5 4

Page 5

Single transformer heating/cooling

systems require a jumper to be

installed connecting RH and R (factory installed).

HVAC Equipment

HP Fault

HP Fault Common

Heating Transformer

24 VAC

Equipment

irst Stage Heating/Emergency Heat Relay

Third Stage Heating/Auxiliary Heat Relay

Reversing Valve (Cooling/Heating)

Golden Valley, MN 55422 www.honeywell.com/yourhome

Cooling Transformer

Second Stage Heating Relay

First Stage Cooling Relay

Second Stage Cooling Relay

This diagram shows the typical equipment, thermostat, and damper motor connections. For specific wiring, refer to the Installation Instructions.

Fan Relay

Auxiliary Equipment

Humidifier

Humidifier Dehumidifier Dehumidifier

Ventilator Ventilator

T8635L MICROELECTRONIC COMMUNICATING PROGRAMMABLE THERMOSTAT

14XZ253

Power-open/ Power-closed (Opposed Blade Damper Motors)

HEAT COOL PURGE FAN EM. HT. COMM ZONE 1 ZONE 2 ZONE 3

BOOTDISCOVERY

O N

2 3 4 5 6 7 8 9 10

#1 #2 CONV HT STG 1 1 1

1 0 2 0 1 3 0 0 HP

ENVIRACOM BUS

1 2 3 1 2 31 2 3 1 23

123

ZONE DAMPER MOTORS M1 - common M4 - power open M6 - power closed

ZONE 1

L C Rh Rc W1/E

LED STATES:

Heat LED Heating Mode Cool LED Cooling Mode

W3/AUX

Purge LED Purge Mode Fan LED Fan Mode

Em Heat LED Em Heat Mode

COMM LED Communications

G O/B

DIP SWITCH SETTINGS

1 SEE TABLE ON OFF 2 SEE TABLE 1 0 3 ENVIRACOM FURN NO YES

HUM

4 PURGE TIME 2.0 MIN 3.5 MIN

HUM

5 PURGE FAN HVAC PANEL 6 PURGE DAMPER NO CHG OPEN

DHUM

7 # COMP STAGES 1 2

DHUM

8 HEAT FAN HVAC PANEL 9 HP CHANGEOVER O B

VENT

10 UNUSED

VENT

DAMPERS

ZONE 2

M4 M1

M6 M4 M1

Power-closed/ Spring-open (Model ZD)

ZONE 3

M4 M1

ZONE LEDS:

On Damper open or opening Off Damper closed or closing

MOMENTARY PUSH BUTTONS

Boot Clears Microprocessor Purge Override Bypass Purge Mode Discovery Initiates Discovery Mode

(can connect to any set of 1,2,3 terminals)

Power-closed/ Spring-open (Model ARD)

PURGE

OVERRIDE

XFRM

Jumpers

Attach jumpers (factory installed in open position)

if using only

one transformer.

Enviracom

123123 12

XFRM R

C T1 T2

Damper

XFRM

24 VAC, 40 VA

Optional

Transformer

(required if

system load

is greater than single transformer

output.)

24 VAC, 40 VA

Panel

Transformer

32003618-00

M20850A

REV. B

Fig. 8. W8835 EnviraZone Panel wiring.

Mounting Thermostat on Wallplate

NOTE: To remove the thermostat from the wall, first

pull out at the bottom of the thermostat; remove the top last.

1. Engage tabs at the top of the thermostat and wallplate. See Fig. 9.

2. Press the lower edge of the case to close and latch.

ENGAGE TABS AT TOP OF THERMOSTAT AND WALLPLATE.

PRESS LOWER EDGE OF CASE TO LATCH.

M1462

Fig. 9. Mounting thermostat on wallplate.

5 69-1331—5

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T8635L MICROELECTRONIC COMMUNICATING PROGRAMMABLE THERMOSTAT

E O

S P

C D A

I S F I A

D O T S

SETTINGS

Thermostat Keys

The thermostat keys are used to: — Set current day and time. — Program times and setpoints for heating and cooling. — Temporarily override program temperatures. — Display present setting.

SET WAKE TIMES AND SETPOINTS

NCREASE TIME

ETTING OR SCROLL

ORWARD THROUGH

NSTALLER SETUP

ND SYSTEM TEST

SET CURRENT DAY AND TIME

RETURN TO NORMAL OPERATIONS

ET CURRENT OR ROGRAM DAY

NTER INDEFINITE

R TIMED HOLD MODE

ECREASE TIME SETTING

R SCROLL BACKWARD HROUGH INSTALLER ETUP AND SYSTEM TEST

HANGE BETWEEN

AYLIGHT SAVINGS

ND STANDARD TIME

Run

Program

Hold Temp

COPY ONE PROGRAMMED DAY TO ANOTHER DAY

INCREASE TEMPERATURE SETTING OR SCROLL FORWARD THROUGH INSTALLER SETUP OPTIONS

Set Current

Day/Time

Day

Daylight

Time

Copy

— Configure Installer Setup. — Perform Installer System Test.

— Display outdoor temperature (when C7089B is

connected). — Set the System key setting. — Set the Fan key setting. — Set, view and clear the filter setting.

See Fig. 10 for key location.

DECREASE TEMPERATURE SETTING OR SCROLL BACKWARD THROUGH INSTALLER SETUP OPTIONS

DISPLAY INFORMATION SUCH AS PRESENT SETTINGS

SET RETURN TIMES AND SETPOINTS

Leave

Wake

Heat/Cool

Settings

CHANGE BETWEEN HEATING AND COOLING SETPOINTS

Set Program

Return Sleep

SystemFilter Fan

SELECT FILTER EXPIRATION IN NUMBER OF DAYS

SET SLEEP TIMES AND SETPOINTS

SET LEAVE TIMES AND SETPOINTS

SELECT FAN OPERATION

SELECT SYSTEM OPERATION (HEAT, COOL, OFF, AUTO)

M17765

Fig. 10. Thermostat key locations and descriptions.

System and Fan Keys

Use the System and Fan keys on the thermostat to select the system and fan settings.

1. Use the System key setting (Fig. 11) to control the thermostat operation:

Heat: The thermostat controls the heating. When

Cool: The thermostat controls the cooling. When

Auto: The thermostat controls heating and cool-

NOTE: Auto is an option on non-zoned systems

Off: Both Heating and cooling are off.

Em Heat: The thermostat controls heating. When

NOTE: Em Heat is an option on systems using

69-1331—5 6

the thermostat is calling for heat, a is indicated in the display.

the thermostat is calling for cool, a is indicated in the display.

ing, automatically switching from heat to cool based on room temperature and thermostat setpoints.

using W8635A,B or on zoned systems using W8835.

thermostat is calling for emergency heat, a and Em Ht are indicated in display.

the W8635B or W8835 and configured for a heat pump with auxiliary heat.

Run

Set Current

Leave

Wake

Program

Day/Time

Hold Temp

Day

Daylight

Time

Return Sleep

Set Program

Time

Heat/Cool Settings

Copy

SystemFilter Fan

System

Fig. 11. System key setting.

IMPORTANT

• The T8635L has an adjustable compressor



protection setting

it can be set from 0 to 5

minutes.

• The thermostat waits to call for cooling (or heating when used with the heat pumps): —when power is first established, —when a power outage occurs or —when the call has just ended and another

call is immediately attempted.

• “wait” is displayed during the compressor protection period.

• To override the compressor protection during installation, refer to the Installer System Test section.

• To permanently override the compressor protection, see Installer Setup No. 33 and change the setting to 0. See Table 6.

Auto: The thermostat automatically changes

between heating and cooling operation, depending on the indoor temperature.

System

M1776

Heat

Off Cool Auto

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T8635L MICROELECTRONIC COMMUNICATING PROGRAMMABLE THERMOSTAT

M13375

CHECK

FILTER

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.

a. Press the Fan key during normal operation to

change the fan setting only for the current program period.

b. To program the fan to operate in Auto or On

for each program period individually, see the Owner’s Guide, 69-1332.

2. Use the Fan key setting (Fig. 12) to control the system fan:

Auto: The fan operates with the heating and

cooling equipment.

Run

Set Current

Leave

Wake

Program

Day/Time

Hold Temp

Day

Daylight

Time

Return Sleep

Set Program

Time

Heat/Cool

SystemFilter Fan

Settings

Copy

Fan

On: The fan temporarily operates continu-

ously for the current program period. The

is displayed any time the thermostat is

Fig. 12. Fan key setting.

calling for fan operation.

Temperature Settings

NOTE: When used with the W8835 or W8703A

Damper Interface Module, a flashing is displayed when one thermostat is calling for fan operation while a thermostat in another zone is calling for heat or cool. After the call ends from the other thermostat, the stops flashing and the re-quested call for fan is honored for this zone.

Table 3. Default Program Settings.

Period Time Heat Setpoint Cool Setpoint Fan Setting

Wake 6:00 am 70°F (21°C) 78°F (25.5°C) Auto

Leave 8:00 am 62°F (16.5°C) 85F (29.5°C) Auto

Return 6:00 am 70°F (21°C) 78F (25.5°C) Auto

Sleep 10:00 am 62°F (16.5°C) 82F (28°C) Auto

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.

Fan

M1776

Auto

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.

(RED) LED

(GREEN) LED

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 communication status after installation. Communication codes 4-6 can be used during initial system zoning installation when more than one thermostat is connected. See Table 4.

Fig. 13. Check and filter LED locations.

7 69-1331—5

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T8635L MICROELECTRONIC COMMUNICATING PROGRAMMABLE THERMOSTAT

Table 4. Communication Code Numbers.

Thermostat

Displays This

Communication

Code Number Possible Cause Action

1 COM Terminal 1 is not connected at the thermostat or

the Equipment Interface Module in a single zone system.

Terminal 1 is not connected correctly at the thermostat in a zoned system.

Terminal 1 is incorrectly wired with either terminal 2 or terminal 3.

2 COM Communication messages are not being sent or

received correctly.

Thermostat component may be defective Replace thermostat.

3 COM Terminal 1 is not connected correctly at the

thermostat or the Equipment Interface Module in a single zone system.

Terminal 1 is not connected correctly at the Equipment Interface Module in a zoned system.

The system is not configured correctly. Enter Installer Setup and run Manual

Communication messages are not being sent or received correctly.

NOTE: During initial installation of system with more than one thermostat connected, codes 4 COM, 5 COM and

6 COM are intended to assist the installer.

4 COM Duplicate zone numbers. More than one thermo-

stat was configured with the same zone number.

5 COM The system found a thermostat with its zone

number set to zero. When more than one thermostat is connected to the zoning system, no thermostat can have its zone number set to zero.

6 COM The system does not have a thermostat with a

zone number one. When more than one thermostat is connected to the zoning system, there must be a thermostat with a zone number of one.

7 COM The system is configured to use an external filter

timer. This is feature that is not yet system-supported.

Check the connection on terminal 1 at the thermostat or the Equipment Interface Module. Check for broken wire if the connection is good.

Check the connection on terminal 1 at the thermostat. Check for broken wire if the connection is good.

Ensure terminals 1, 2 and 3 are connected to the correct terminals at all devices.

Check the connection on terminal 1 at the thermostat or the Equipment Interface Module. Check for broken wire if the connection is good.

Check the connection on terminal 1 at the Equipment Interface Module. Check for broken wire if the connection is good.

Discovery.

Check the connection on terminal 1 at the thermostat or the Equipment Interface Module. Check for broken wire if the connection is good.

Configure each thermostat in the system with a different zone number beginning with one.

Configure the thermostat zone numbers to begin with one.

Configure Installer Setup No. 43 to 0.

INSTALLER SETUP

The installer can use the Installer Setup options to change factory settings to customize installations. See Table 6.

NOTE: The Advanced Setup options in Table 7 are for

reference only and should remain as set at the factory.

Scope

The installer can determine if the scope of the Installer Setup change will be globally applied to all thermostat locations in the system (when used in a zoned system); or locally applied to only one thermostat location.

— Local: Only the thermostat where the installer setup

option is changed is affected by the change.

69-1331—5 8

— Global: All thermostats are affected by the change.

Zoning

Using the T8635L in a zoned application enables these features: — Time synchronization. — Shared filter indication. — Outdoor temperature display in all zones with only

one temperature sensor connected. — Vacation hold in all zones. — Check LED in all zones (when used with the

W8635B or W8835 configured for heat pump). — System switch setting automatically changed for all

zones when used with W8635A or W8635B. — System switch on each T8635 can be set

individually when used with a W8835. — Individual fan control by zone.

Page 9

T8635L MICROELECTRONIC COMMUNICATING PROGRAMMABLE THERMOSTAT

Up to three T8635 Thermostats can be connected to the W8835 or W8703A Damper Interface Module. Up to nine T8535 Thermostats can be used with two additional W8703 Damper Interface Modules:

1. Select zone number for each thermostat in the system.

2. If there is only one thermostat in the system, set the Installer Setup No. 1 to 0. See Table 6.

3. When more than one thermostat in the system, set Installer Setup No.1 at first thermostat to 1, second thermostat to 2, third thermostat to 3, etc, up to nine zones. Do not set more than one thermostat in the system to the same zone number.

4. Then match each thermostat with the corresponding zone on the W8703 Damper Interface Module or W8835 EnviraZone Panel.

5. Attach the zone number stickers, included with the thermostat, onto the thermostat case on the inside of the thermostat cover. See Fig. 14.

Zone 2

IMPORTANT

Notice that if more than one thermostat is set to the same zone number, the thermostat displays “4 COM”.

Zone 3

Place one label inside each thermostat door.

Fig. 14. Zone stickers included

with T8635L Thermostat.

Zone 1

M1342

NOTE: While in Discovery mode, the thermostat dis-

plays “wait” for 20 seconds.

To change these and other installer settings: — Follow the instructions in Table 6. — Manually changing the stage configuration and cycle

rate settings locks Discovery mode so if power is lost, all custom settings are retained in memory.

If at any time (such as adding new equipment or modules) it is necessary to run Discovery mode: — Enter Installer Setup and follow the instructions in

Table 6.

— Manually running Discovery mode unlocks it until

the stage configurations or cycle rates are changed.

Stage Configuration

To configure thermostat stages: — W8835 EnviraZone Panel:

a. automatically configures staging based on the

W8835 configuration.

b. set Installer Setup No. 5, 8, and 9 to the num-

ber of stages controlled. See Table 6.

— W8635A EIM and T8635L:

a. automatically configures for two stages of

heat and two stages of cool.

b. set Installer Setup No. 5 and No. 8 to 1 for

one stage heat /one stage cool conventional application. See Table 6.

— W8635B EIM and T8635L:

a. automatically configures for two stages of

heat and one stage of cool.

b. set Installer Setup No. 5 to 1 and Installer

Setup No. 9 to 0 for single-stage heat pump application. See Table 6.

Discovery Mode

Discovery mode begins when T8635L Thermostat and the modules are first installed and power is connected: — The W8835 transmits data based on its configuration

on initial powerup and when its Disovery switch is pressed.

— The W8635 EIM transmits information to T8635L

Thermostat that indicates maximum number of stages that are enabled and type of EIM connected.

— The thermostat receives information from the W8635

and then sets the cycle rates and equipment types automatically.

Default Cycle Rate Settings.

1st Stage Heat

W8635A Equipment Interface Module, or W8835 configured for conventional heat

6 cph 6 cph 3 cph 3 cph

Stage Heat/Cool 2nd Stage Heat (Auxiliary) Emergency Heat

W8635B Equipment Interface Module or W8835 configured for heat pump

3 cph 9 cph 9 cph

Stage Heat and 3rd

Stage Heat, W8835 1

Cycle Rate

The thermostat automatically sets the cycle rate based on the information it received during Discovery mode.

To change the default cycle rate settings: — see Table 5 for typical cycle rate settings. — enter Installer Setup and select the desired cycle

rate settings for each stage. (All stages can be set between 1 and 12 cph.)

Stage Cool 2nd Stage Cool

9 69-1331—5

Page 10

T8635L MICROELECTRONIC COMMUNICATING PROGRAMMABLE THERMOSTAT

t f l

(COLUMN 1 OF TABLE 5)

Table 5. Typical Heating Cycle Rate Settings.

System Cycles Per Hour

Steam, Gravity 1

Hydronic Heat, Condensing Gas Furnaces

, Compressor Stages

Gas or Oil Forced Air, Auxiliary Heat 6

Electric Heat, Emergency Heat 9

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 Discovery 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 to scroll to the 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 , ▲ and ▼ keys

until Installer Setup No. 1 is displayed.

— all display segments appear for approximately three

seconds before Installer Setup No.1 is displayed.

— see Fig. 15 and 16.

Wait Recovery

Hold for

Filter

Em Ht

Mon

TueWed Thu Fri Sat Sun

Wake Leave Return Sleep

Set Day/TimeSet Program

Aux Ht

Days

Temporary Setting

Repl Batt

DST

Heat

OutdoorRoom

Cool

System

Em Hea

Coo Auto

Fan

Auto

Fig. 15. LCD segments display.

INSTALLER SETUP NUMBER DISPLAY

FACTORY SETTING OR OTHER CHOICE DISPLAY (COLUMN 4 OR 5 OF TABLE 5)

M13376

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 key.

3. To change an Installer Setup, use the ▲ or ▼ key.

4. To exit Installer Setup, press Run Program key.

Table 6. Installer Setup Numbers and Default Settings and Options.

Installer

Setup

Number

(Press

key to

change) Description Scope

1 Zone number Local 0 No zoning. 1 to 9 Zone numbers can be set

LOC Lock/Unlock the system

to Automatic Discovery

mode

dIS Runs Automatic

Discovery mode.

4 Fan operation (only

when used with W8635A).

69-1331—5 10

Default Setting

Display Description Display Description

Global LOC

off.

Automatic Discovery mode occurs.

Global dIS Press the ▲ key to

start Automatic Discovery mode.

Global 0 Conventional

applications where equipment controls fan operation in heat mode.

Other Options (Press ▲ or

▼ key to change

to zones 1 through 9.

LOC on Automatic Discovery

mode does not occur.

——

1 Electric heat applications

where thermostat controls fan operation in heat mode.

Page 11

T8635L MICROELECTRONIC COMMUNICATING PROGRAMMABLE THERMOSTAT

Table 6. Installer Setup Numbers and Default Settings and Options. (Continued)

Installer

Setup

Number

(Press

key to

change) Description Scope

5 Number of heating

Global 1, 2 Number of heating

stages.

Default Setting

Display Description Display Description

stages found during Automatic Discovery

Other Options (Press ▲ or

▼ key to change

0, 1, 2, 3 Select the number of

heating stages for this application.

mode.

8 Number of cooling

stages (maximum for W8635B is one).

Global 1, 2 Number of cooling

stages found during Automatic Discovery

0, 1, 2 Select the number of

cooling stages for this application.

mode.

9 Number of emergency

heat stages (only when used with W8835 or

Global 1 Number of

emergency heating stages.

0, 1, 2 Select the number of

emergency heat stages for this application.

W8635B).

13 Adaptive Intelligent

Recovery™ (system starts early so setpoint

Global 0 Adaptive Intelligent

Recovery™ is activated.

1 Conventional recovery

(system starts recovery

at period start time). is reached by start of program period).

14 Temperature indication

scale (°F or °C)

Global 0 Temperature is

indicated in °F.

1 Temperature is indicated

in °C.

16 Clock format Global 0 12-hour clock format 1 24-hour clock format.

19 Fan overrun in heating

(not implemented for gas/oil heat).

20 Fan overrun in cooling. Global 0 0 seconds of fan

Global 0 0 seconds of fan

operation after heating turns off.

operation after cooling turns off.

1 90 seconds of fan

operation after heating

turns off.

1 90 seconds of fan

operation after cooling

turns off.

25 Keypad lockout. Local 0 No lockout 1 1—Locks out all except

▲ ▼ i, run, dst, and set

current day/time.

2—Locks out all except i,

run, dst, and set current

day/time.

(In all cases, the

combination to enter the

Installer Setup and the

Installer Test is

available.)

30 Minimum deadband

between heating and cooling.

33 Minimum off time for

cooling and compressor.

34 Maximum setpoint

range stop for heating.

35 Minimum setpoint range

stop for cooling.

Global 3 Heating and cooling

setpoints can be set no closer than 3°F (1.5°C) to 10°F (5 °C).

Global 5 Five-minute minimum

off time for the compressor.

Global 90°F

(32°C).

Heating setpoint range can be set no higher than 90°F (30°C).

Global 45°F

(7°C).

Cooling setpoint range can be set no lower than 45°F.

4 to 10 Heating and cooling

setpoints can be set no

closer than the chosen

value between 3° F and

10 °F (1.5 and 5 °C).

0, 1, 2, 3, 4 or 5

Choose 0, 1, 2, 3, 4 or 5

minute minimum off time

for the compressor.

40°F through 90°F (4.5°C to 32°C).

45°F through 99°F (7°C to 37°C).

Maximum setpoint range

stop can be set

anywhere between 40° F

and 90°F in 1°F (0.5°C)

increments.

Minimum setpoint range

stop can be set

anywhere between 45°F

and 99°F in 1°F (0.5°C.)

increments.

11 69-1331—5

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T8635L MICROELECTRONIC COMMUNICATING PROGRAMMABLE THERMOSTAT

Table 6. Installer Setup Numbers and Default Settings and Options. (Continued)

Installer

Setup

Number

(Press

key to

change) Description Scope

37 Field calibration

Local 0 No difference

adjustment.

Default Setting

Display Description Display Description

between displayed temperature and actual room

Other Options (Press ▲ or

▼ key to change

-3, -2, -1, 1, 2, 3

Display adjusts to the

chosen °F higher or

lower than room

temperature.

43 Filter timer. Global 0 Thermostat filter timer

is used.

44 Backlight operates

continuously or with a

Local 0 Backlight operates

with a key press.

1 External filter timer is

used.

1 Backlight operates

continuously. key press.

45 Outdoor temperature

sensor.

Local 0 Outdoor temperature

sensor is not

1 Outdoor temperature

sensor is configured.

configured.

46 Enable humidity display. Global 0 Humidity display

disabled.

51 Stage 1 heat cycle rate. Global

52 Stage 2 heat cycle rate.

Cycle rate of equipment (cph).

1 Humidity display

enabled.

1, 2, 3, 4, 5, 6, 7, 8,

Cycle rate of equipment

(cph).

9, 10, 11, or 12

55 Emergency heat cycle

rate.

Global 9 Cycle rate of

equipment (cph).

1, 2, 3, 4, 5, 6, 7, 8,

Cycle rate of equipment

(cph).

9, 10, 11, or 12

57 Stage 1 cool cycle rate. Global 3 Cycle rate of

58 Stage 2 cool cycle rate.

equipment (cph).

0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10,

Cycle rate of equipment

(cph).

11, or 12

ADV Advance configuration

menu to review/modify equipment ID and type.

ADV off.

No access to Advanced Installer Setup No. 61-63,

ADV on Access to Advanced

Installer Setup No. 61-63,

65-69, 71-73, 75-79.

This value is not installer adjustable. If any of these Installer Setup No. are changed: 4, 5, 8, 9, 51, 52, 55-ADV from Table 6 and 62-63, 65-69, 71-73, 75-80 from Table 7, the settings are locked and Automatic Discovery cannot occur. To unlock Discovery, advance to “dIS” and press the ▲ key to manually initiate Discovery mode. During Discovery, “wait” appears in the display for approximately 20 seconds and the thermostat is not functional.

3 cph when used with W8635B or W8835 configured for heat pump; 9 cph when used with the T8635 set for electric heat.

IMPORTANT

Review the settings to confirm that they are correct for your application. Press Run Program key to exit Installer Setup. The settings will be saved indefinitely in memory. Upon exiting Installer Setup, “wait” appears in the display for approximately 20 seconds.

Set the time and day on the last thermostat configured after exiting Installer Setup. See Setting Current Day and Time section.

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T8635L MICROELECTRONIC COMMUNICATING PROGRAMMABLE THERMOSTAT

Advanced

Installer

Setup

Number

(Press

key to

change) Description

Equipment Type 1 of Heat

Equipment Type 2 Stage of Heat

Equipment Type 3 of Heat

Equipment Type 1 of Emergency Heat

Equipment Type 2 Stage of Emergency Heat

Equipment Type 1 of Cool

Equipment Type 2 Stage of Cool

Equipment Type 3 of Cool

Equipment ID 1 Heat

Equipment ID 2 Heat

Equipment ID 3 Heat

Equipment ID 1 Emergency Heat

Equipment ID 2 Emergency Heat

Equipment ID 1 Cool

Equipment ID 2 Cool

Equipment ID 3 Cool

(For reference only. Do not change any of these settings.)

Table 7. Advanced Setup Options.

Default Setting

Display Description Display Description

Stage

1, 2, 3, 4 or 5

1 - Natural gas or oil heating. 2 - Free heating (outside) air

1, 2, 3, 4 or 5

without ventilation.

3 - Free heating (outside) air

with ventilation.

Stage

4 - Compressor heating (heat

pump). 5 - Electric heating. Default display indicates the equipment that was found

Stage

1, 2, 3, 4 or 5

during Discovery mode.

1 - Evaporative cooling. 2 - Free cooling (outside) air

without ventilation. 3 - Free cooling (outside) air

with ventilation.

Stage

4 - Compressor cooling. Default display indicates the equipment that was found during Discovery mode.

Stage of

0, 1, 2 or 3

This is a unique identification number corresponding to the equipment assigned the same number.

Default display indicates the equipment that was found during Discovery mode.

0, 1, 2 or 3

Other Options Press ▲ or

▼ key to change)

1 - Natural gas or oil

heating.

2 - Free heating (outside)

air without ventilation.

3 - Free heating (outside)

air with ventilation.

4 - Compressor heating

(heat pump). 5 - Electric heating. Default display indicates the equipment that was found during Discovery mode.

1 - Evaporative cooling. 2 - Free cooling (outside)

air without ventilation. 3 - Free cooling (outside)

air with ventilation. 4 - Compressor cooling. Default display indicates the equipment that was found during Discovery mode.

This is a unique identification number corresponding to the equipment assigned the same number.

SETTINGS

Setting Current Day and Time

1. Press Set Current Day/Time key.

Run

Set Current

Leave

Wake

Set Current

Day/Time

Program

Day/Time

Hold Temp

Day

Daylight

Time

Return Sleep

SystemFilter Fan

Mon

Set Program

Time

Heat/Cool

Settings

Copy

Set Day/Time

NOTE: On initial powerup or after an extended

power loss, 1:00pm flashes in the display until a key is pressed.

2. Press Day key until the current day is displayed.

Set Day/Time

Run

Set Current

Leave

Wake

Program

M1776

Day

Day/Time

Hold Temp

Day

Daylight

Time

Return Sleep

Set Program

Time

Heat/Cool

SystemFilter Fan

Settings

Copy

Tue

13 69-1331—5

M17768

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T8635L MICROELECTRONIC COMMUNICATING PROGRAMMABLE THERMOSTAT

TEST NUMBER

3. Press or until the current time is dis- played.

Time

Run

Set Current

Leave

Wake

Program

Day/Time

Hold Temp

Day

Daylight

Time

Return Sleep

Set Program

Time

Heat/Cool

SystemFilter Fan

Settings

Copy

Set Day/Time

Tue

M17769

NOTE: Tapping the Set Current Day/Time key

changes the time in one-hour increments.

4. If the current time is Daylight Savings Time, press Daylight Time key to display DST.

Set Day/Time

Run

Set Current

Leave

Wake

Daylight

Time

Program

Day/Time

Hold Temp

Day

Daylight

Time

Return Sleep

Set Program

Time

Heat/Cool

SystemFilter Fan

Settings

Copy

Tue

M17770

5. Press Run Program key.

System

Run

Program

Run

Set Current

Leave

Wake

Program

Day/Time

Hold Temp

Day

Daylight

Time

Return Sleep

Set Program

Time

Heat/Cool

SystemFilter Fan

Settings

Copy

Tue

Wake

Room

DST

Fan

M1777

Hea

Auto

INSTALLER SYSTEM TEST

Use the Installer System Test to check the thermostat and W8635 Equipment Interface Module operation for each thermostat in the system. Table 8 lists the available system tests.

IMPORTANT

When used in zoning, you must exit Installer System Test before entering Installer System Test at another thermostat.

See Table 9 for Installer System Test descriptions.

Table 8. Installer System Tests.

Tes t

Number System Test Description

10-12 Heating stages can be turned on and off in

sequence.

20-21 Emergency heating can be turned on and off.

30-32 Cooling stages can be turned on and off in

sequence.

40-42 Fan and damper test.

60 Keyboard keys test.

70-74 Thermostat information, including date code

and software versions, are displayed.

Programming

See the Owner’s Guide, 69-1332, for complete programming instructions.

CAUTION

Equipment Damage Hazard. Minimum compressor off-time is bypassed during Installer System Test.

Do not allow compressor rapid cycling (on and off). Observe compressor protection period.

Starting Installer System Test

Press and hold the ▲ and ▼ keys at the same time until 10 appears. All segments of the display are shown before the test number 10 appears. See Fig. 15 and 17.

Table 9. Installer System Test Options.

Key to Press Test Number Description

Heating Equipment System Test

10 Enter Heating Equipment system test.

M10257

Fig. 17. Test number display.

▲

▼

11 First Stage Heat turns on.

12 Second Stage Heat turns on.

11 Second Stage Heat turns off.

10 First Stage Heat turns off.

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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)

20 Enter Emergency Heat Equipment system test.

▲

▼

Cooling Equipment System Test

▲

▼

Fan and Damper Test Damper Test available only when using W8703A)

▲

▼

Key Operation Test

21 Emergency Heat turns on.

20 Emergency Heat turns off.

30 Enter Cooling Equipment system test.

31 First Stage Cool turns on.

32 Second Stage Cool turns on (W8635A only).

31 Second Stage Cool turns off (W8635A only).

30 First Stage Cool turns off.

40 Enter Fan and Damper test.

41 Fan turns on; damper for this zone opens.

42 Damper closes for this zone (if not already closed); fan stays on.

41 Damper opens for this zone.

40 Fan turns off.

60 Enter Key Operation test.

Press any key to test if the key is functional. Each time a key is pressed, a different number is displayed. This indicates the key is functioning properly. Pressing enters the next test.

Thermostat Information

70 Enter Thermostat Information mode.

▲

Exit Installer Test Mode

Run Program key Thermostat returns to normal operating mode.

71 Production date code is displayed. The first two large digits are the month

and the third digit is the last digit of the year (example: 031 = March 2001).

72 Software identification code is displayed.

73 Software revision number is displayed.

74 EEPROM identification code is displayed.

CHECKOUT

Outdoor Temperature Sensor

Allow the C7089B Outdoor Temperature Sensor to absorb the outdoor air for a minimum of five minutes before taking a reading.

TROUBLESHOOTING GUIDE

Refer to Table 10 for troubleshooting information.

15 69-1331—5

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T8635L MICROELECTRONIC COMMUNICATING PROGRAMMABLE THERMOSTAT

Table 10. Troubleshooting Information.

Symptom Possible Cause Action

Display does not come on.

Thermostat is not being powered. Check if the thermostat is mounted and latched on the

wallplate; if not:

—mount and latch the thermostat on the wallplate.

Check if the circuit breaker is tripped; if it is:

—reset the circuit breaker.

Check if the fuse in the fuse box is blown; if it is:

—replace the fuse.

Check if the power switch at the equipment is in the Off position; if it is:

—set to the On position.

Check for 24 vac on terminals 2 and 3:

—replace any broken wires.

If 24 Vac is present on terminals 2 and 3, replace the thermostat.

“1 COM”, “2 COM”, or “3 COM” is displayed.

Thermostat is not communicating correctly with the W8835 or W8635A,B.

Check the connection to terminal 1 at the thermostat and W8835 or W8635 EIM:

—replace any broken wires. —cycle power.

“4 COM” is displayed on left side of the display.

5 COM Zone 0 was found in a zoned

More than one thermostat is set to the same zone number.

system

Enter Installer Setup and change Installer Setup Number 1 to another value (1-3) that is different from the thermostat with the same zone number.

Enter Installer Setup and change Installer Setup Number 1 to another value (1-9) that corresponds to the zone it is controlling.

6 COM Zone 1 was not found. Enter Installer Setup on the Zone 1 Thermostat and

change Installer Setup Number 1 to 1.

7 COM System is configured to use

external timer.

System switch setting displays “off only.”

During Automatic Discovery mode, the thermostat did not correctly set the number of heat or cool stages.

The external timer function is not currently available. Enter Installer Setup and change Installer Setup 43 to 0.

Run Automatic Discovery mode by cycling power to the equipment.

Manually run Discovery mode in Installer Setup.

Manually configure heat and/or cool stages (Installer Setups 5, 8 and 9).

Thermostat is calling for heat or

cool; or displays and the

corresponding damper does not open.

Heating does not come on. System

on indicator displays.

Thermostat zone number is not set to the corresponding W8703 zone number.

Terminal 1 on W8703 Damper Interface Module is not properly connected.

W8703 Damper Interface Module is defective.

Communication is not being completed.

Set zone number at the thermostat to correspond with the correct zone number for the W8703 Damper Interface Module.

Properly connect terminal 1 on the W8703 Damper Interface Module.

If the W8703 indicates the damper is closed (red LED lights), replace the W8703 Damper Interface Module.

End the call and repeat the call. Check the Flash Com OK LED on the W8835 or W8635 EIM while the call is being made. If the Flash Com OK LED does not blink:

—check communication bus wiring. Heat load at W8635 EIM is not connected correctly.

If the Flash Com OK LED blinks correctly:

—check that 24 Vac is present at W1 or W1/Y1 terminal,

depending on which equipment module is being used.

If 24 Vac is not present, check the R to Rh connection. If the connection is good, replace the W8835 or W8635 EIM.

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T8635L MICROELECTRONIC COMMUNICATING PROGRAMMABLE THERMOSTAT

Table 10. Troubleshooting Information. (Continued)

Symptom Possible Cause Action

Cooling does not come on. System

on indicator displays.

Communication is not being completed.

End and repeat the call for cool. Check the Flash Com OK LED on the W8635 EIM or W8835 while the call is being made. If the Flash Com OK LED does not blink:

—check communication bus wiring. Cool load at W8635 EIM is not connected correctly.

If the Flash Com OK LED blinks correctly:

—check that 24 Vac is present at Y1 or W1/Y1 terminal, depending on which EIM is being used. If 24 Vac is not present, check R to Rc and/or Rh connections. If the R to Rc and/or Rh connections are good, replace the W8635 EIM or W8835.

“wait” is displayed and the call for Cool (or Heat when used in a heat pump application) has not

Compressor protection is in effect. Compressor protection can be set from 0 to 5 minutes to

prevent compressor damage due to rapid cycling. Wait until the compressor protection period expires. To bypass compressor protection during the installation phase, see the Installer System Test section.

started.

stage heat or

2 cool does not energize (only when used with W8635A).

Stage configuration is not set correctly to match the number of selected stages.

Cool load at W8635 EIM is not connected correctly.

Set the Stage configuration in Installer Setup for two stages of heat and/or two stages of cool.

Check that 24 Vac is present at Y2, W2 or Aux. Terminal, depending on EIM used. If 24 Vac is not present, all connections are good and the thermostat is properly configured, replace W8635A EIM or W8835.

Emergency Heat does not energize (only when used

Emergency Heat load at W8635 or W8835 is not connected correctly.

Check that 24 Vac is present at E terminal. If 24 Vac is not present, all connections are good, and the thermostat is properly configured, replace W8635B or W8835.

with W8635B or W8835).

Emergency Heat can not be selected with the System

Stage configuration is not set correctly to match the number of stages selected.

Set the Stage configuration, Installer Setup No. 9 to 1, see table 5 for one stage of Emergency Heat.

switch (W8635B only).

Fan does not come on with a call for

Electric heat setting is not configured.

Set Installer Setup No. 4 to 1 for electric heat, see Table 6.

electric heat.

Fan load at the W8835 or W8635 EIM is not connected correctly.

Check that 24 Vac is present at G terminal. If 24 Vac is not present, all connections are good, and the thermostat is configured, replace the W8635 EIM or W8835.

The is flashing and the damper does not open.

Temperature setting does not change (example: cannot set the heating higher or the cooling lower).

Fan runs continuously.

Thermostat is waiting for a call for heat or cool to end in another zone before opening this zone damper.

The upper or lower temperature limits are reached.

Fan setting set to On or programmed to On.

Wait until call from other zone ends.

Check temperature setpoint limits; setpoint limit ranges are:

—heating: 40° to 90°F (4.5° to 32°C).

—cooling: 45° to 99°F (7° to 37°C). See Installer Setup no. 34 and no. 35 to change the setpoint limits, see Table 6.

Pressing the Fan key changes the fan from On to Auto or vice versa for the duration of the current program period. To set the fan to run continuously for all periods, program the fan to On for each period and day.

The green LED is on.

Filter expired. Replace filter or clean electronic air cleaner cells. Press

and hold the filter key to reset the timer. To disable the filter timer, select 0 as the timer value.

The red LED is on. Check LED. 24 Vac is present at

Check heat pump manufacturer instructions.

the L terminal on the W8835 or W8635B EIM.

17 69-1331—5

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T8635L MICROELECTRONIC COMMUNICATING PROGRAMMABLE THERMOSTAT

Table 10. Troubleshooting Information. (Continued)

Symptom Possible Cause Action

Outdoor temperature not displayed or is incorrect.

Outdoor temperature setting is not enabled in Installer Setup.

Install one C7089B Outdoor Temperature Sensor to OT terminals on one thermostat in the system and configure Installer Setup No. 45 to 1, see Table 6, only at the zone where the outdoor sensor is connected.

Heat or cool turns on before programmed time.

Outdoor sensor is not connected, is connected incorrectly or is outof-range.

Outdoor sensor is configured at more than one thermostat zone location.

Filter expired.

Adaptive Intelligent Recovery™ is on.

If the outdoor sensor is not connected or is out-of-range (below –40°F or above 120°F) “- -” is displayed on the thermostat where the outdoor sensor is located. All other thermostats do not display an outdoor temperature until the sensor is in range or connected correctly.

Outdoor temperature alternates between displaying outdoor temperature and “- -” . Configure only the thermostat where the outdoor sensor is connected.

Press key twice for outdoor temperature when filter expiration displays. Refer to the Filter Indication section.

Adaptive Intelligent Recovery™ brings on the heat or cool early to meet the temperature set for the programmed period. To disable Adaptive Intelligent Recovery™, configure Installer Setup No. 13 to 1, see Table 6.

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T8635L MICROELECTRONIC COMMUNICATING PROGRAMMABLE THERMOSTAT

19 69-1331—5

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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

69-1331—5 G.H. Rev. 02-03 Printed in Taiwan R.O.C. www.honeywell.com/yourhome

M1V 4Z9

Honeywell T8635L, W8835A, W8835E, W8635A, W8635B Installation Instructions Manual

Specifications and Main Features

Frequently Asked Questions

User Manual