Honeywell THM5421C1008 User Manual

VisionPRO® IAQ Total Home Comfort System

FEATURES

• Large, clear display with backlight shows the current and set temperature and time—even in the dark.

• Touchscreen interaction

• Real-time clock keeps time during power failures and automatically updates to daylight savings.

• Change/check reminders let you know when to service or replace filters.

• Various Hold options allow you to override the program schedule, as desired.

• Controls humidification to increase homeowner comfort while protecting woodwork and furnishings.

• Controls dehumidification using air conditioner with high or low speed fan or a whole house dehumidifier.

• Controls ventilation with other HRV, ERV, or Freshair damper. Vent on demand and automatically using patented advanced ventilation control.

APPLICATION

• Advanced heat pump control featuring balance point plus 2°F droop to increase homeowner comfort.

PRODUCT DATA

The VisionPRO® IAQ Total Home Comfort System features an effortless, 7-Day programmable touchscreen thermostat that provides control of temperature, humidification, dehumidification, and ventilation.

Contents

Application/Features.......................................................... 1

Specifications/Ordering Information .................................. 2

Installation ........................................................................ 4

Wiring ............................................................................... 5

Power the Thermostat ...................................................... 8

Installer Setup .................................................................. 12

Operation .......................................................................... 19

Programming .................................................................... 25

Troubleshooting ................................................................ 35

68-0287-1

VISIONPRO® IAQ TOTAL HOME COMFORT SYSTEM

SPECIFICATIONS

Thermostat Description:

Feature Description

Powering method • Common wire only

System types (up to 4 heat/2 cool)

• Gas, oil or electric heat with air

conditioning

• Warm air, hot water, high-efficiency

furnaces, heat pumps, steam and gravity

• Heat only with fan

• Cool only

Changeover Manual or Auto changeover selectable

System setting Heat-Off-Cool-Auto

Fan setting Auto-On-Circ

Electrical Ratings:

Terminal Voltage (50/60 Hz) Running Current

W1 Heating 20 - 30 Vac .02 - 1.0A

W2/Aux Heating 20 - 30 Vac .02 - 1.0A

W3/Aux2 Heating 20 - 30 Vac .02 - 1.0A

Y Cooling 20 - 30 Vac .02 - 1.0A

Y2 Cooling 20 - 30 Vac .02 - 1.0A

G Fan 20 - 30 Vac .02 - 1.0A

Temperature Setting Range:

Heating: 40°F to 90°F(4.5°C to 32°C). Cooling: 50°F to 99°F (10°C to 37°C).

Operating Ambient Temperature:

VisionPRO

IAQ Thermostats: 0°F to 120°F

(-18°C to 49°C). THM5421C1008: -30°F to 150°F (-34°C to 66°C). C7089U1006: -40°F to 120°F (-40°C to 49°C). C7189U1005: 45°F to 88°F (7°C to 32°C).

Shipping Temperature:

VisionPRO

IAQ Thermostats: -30°F to 150°F

(-34°C to 66°C). THM5421C1008: -30°F to 150°F (-34°C to 66°C).

Operating Relative Humidity (Non-condensing):

VisionPRO

IAQ Thermostats: 5% to 90%. THM5421C1008: 5% to 90%. C7089U1006: 5% to 95%. C7189U1005: 5% to 95%.

Humidification Setting Range:

Heating: 10% to 60% RH.

Dehumidification Setting Range:

Heating: 40% to 80% RH.

Humidity Display Range:

0% to 99%.

Finish:

VisionPRO THM5421C1008: Premier White C7189U1005 Wall Mount Remote Indoor Sensor: Premier

White

IAQ Thermostats: Premier White® color.

color.

Clock Accuracy: +/- 1 minute per year.

Resistance Characteristics of Remote Sensors:

C7089U1006 Outdoor Sensor: Negative temperature coeffi-

cient (NTC) means that resistance decreases as the temperature increases. See Table 12 in the Operation section for sensor resistance characteristics.

C7189U1005 Remote Indoor Sensor: Negative temperature

coefficient (NTC), means that resistance decreases as the temperature increases. See Table 13 in the Operation section for sensor resistance characteristics.

Cool Indication:

VisionPRO

IAQ Comfort Systems show “Cool On” on the

thermostat screen when Cool is activated.

Heat Indication:

VisionPRO

IAQ Comfort Systems show “Heat On” on the

thermostat screen when Heat is activated.

Auxiliary Heat Indication:

VisionPRO

IAQ Comfort Systems show “Aux. Heat On” on

the thermostat screen when Auxiliary Heat is activated.

Calibration:

C7089U1006, C7189U1005 and VisionPRO® IAQ Comfort Sys-

tems are factory-calibrated and require no field calibration.

Interstage Differential:

VisionPRO

IAQ Comfort Systems operate with droopless control. Once the thermostat senses that 1st stage is running at 90% capacity, the thermostat energizes 2nd stage.

Mounting Means:

VisionPRO

IAQ Comfort System: Thermostat mounts directly on the wall in the living space using mounting screws and anchors provided. Fits a vertical or horizontal 2 x 4 in. junction box.

THM5421C1008 Equipment Interface Module (EIM) mounts on

HVAC equipment or on a wall in the equipment room.

C7089U1006 Outdoor Sensor: Mounts outside of living space

with mounting clip and screws provided.

C7189U1005 Remote Indoor Sensor: Mounts directly on the

wall using mounting screws and anchors provided.

Cover Plate:

32003796-001 Cover Plate is used to cover marks left on the

wall by the old thermostat.

Dimensions:

VisionPRO

IAQ Comfort System: see Fig. 1.

THM5421C1008: see Fig. 2 C7089U1006 Outdoor Sensor Mounting Clip: see Fig. 3. 32003796-001 Cover Plate: see Fig. 4. C7189U1005 Remote Indoor Sensor: see Fig. 5.

Cycle Rates (at 50% Load):

Heating: Selectable 1 - 12 cycles per hour. Cooling: Selectable 1 - 6 cycles per hour.

68-0287—1 2

VISIONPRO® IAQ TOTAL HOME COMFORT SYSTEM

WALLPLATE

3-3/8 (86)

THERMOSTAT

6 (152)

3-3/8 (86)

THERMOSTAT

AND WALLPLATE

4-9/16

(116)

1-3/8 (35)

M23539

1-1/2 (38)

M4488

Fig. 3. C7089U1006 Outdoor Sensor Mounting Clip

dimensions in in. (mm).

7-7/8 (200)

3-5/16 (84)

5-1/2

(140)

3-5/16

(84)

Fig. 1. VisionPRO® IAQ Comfort System

dimensions in in. (mm).

7-9/32

(185)

6-57/64

(175)

4-35/64

(116)

FRONT VIEW SIDE VIEW

1-21/64

(34)

M22139

Fig. 4. 32003796-001 Cover Plate dimensions in in. (mm).

M23544

Fig. 2. THM5421C1008 Equipment Interface Module

dimensions in in. (mm).

3 68-0287—1

VISIONPRO® IAQ TOTAL HOME COMFORT SYSTEM

2-9/32

(58)

1-1/2 (38)

M23522

FRONT VIEW SIDE VIEW FRONT VIEW (COVER OFF)

Fig. 5. C7189U1005 Remote Indoor Sensor dimensions in in. (mm).

INSTALLATION

When Installing this Product...

1. Read these instructions carefully. Failure to follow the

instructions can damage the product or cause a hazardous condition.

2. Check the ratings given in the instructions 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

verify the product operation.

Selecting Location

Install the thermostat about 5 ft. (1.5m) above the floor in an area with good air circulation at average temperature. See Fig. 6.

2-9/32

(58)

45/64

(18)

1-1/2 (38)

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.

Installing Wallplate

CAUTION

Electrical Hazard. Can cause electrical shock or equipment damage.

Disconnect power before wiring.

The thermostat can be mounted horizontally on the wall or on a 4 in. x 2 in. (101.6 mm x 50.8 mm) wiring box.

M19925

YES

5 FEET

[1.5 METERS]

Fig. 6. Selecting thermostat location.

68-0287—1 4

1. Position and level the wallplate (for appearance only).

2. Use a pencil to mark the mounting holes.

3. Remove the wallplate from the wall and, if drywall, drill

two 3/16-in. holes in the wall, 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.

VISIONPRO® IAQ TOTAL HOME COMFORT SYSTEM

4. Position the wallplate over the holes, pulling wires

through the wiring opening. See Fig. 7.

5. Insert the mounting screws into the holes and tighten.

WALL

WIRES THROUGH WALL AND WIRE SLOT

WALL ANCHORS (2)

MOUNTING HOLES

M23541

MOUNTING SCREWS (2)

M23543

Fig. 7. Mounting wallplate.

Installing Equipment Interface Module (EIM)

NOTE: It is normal for the LED to blink continuously during

startup, and while checking equipment status (Auto Discover mode).

WALL ANCHOR

COMMUNICATION LED

DRILL 3/16 IN. HOLES FOR DRYWALL. DRILL 7/32 IN. HOLES FOR PLASTER

CAUTION

Electrical Hazard. Can cause electrical shock or equipment damage.

Disconnect power before wiring.

The EIM can be mounted vertically on the HVAC equipment or on a wall in the equipment room.

1. Position the EIM.

2. Use a pencil to mark the mounting holes.

3. Remove the wallplate from the wall and, if drywall, drill

two 3/16-in. holes in the wall, 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 wires

through the wiring opening.

5. Insert the mounting screws into the holes and tighten.

See Fig. 8.

Communication LED

The EIM has an LED (see Fig. 8) that communicates the EIM status as follows.

• LED blinks rapidly: Normal information transfer.

• LED blinks once: Incoming message to EIM.

• LED blinks continuously: Wiring problem. Check wiring to

terminals 1, 2, 3.

• LED always off: Wiring problem. Check wiring to terminals

1, 2, 3.

• LED always on: EIM may need replacement.

MOUNTING SCREW

M23484

Fig. 8. Mounting EIM.

WIRING

All wiring must comply with local electrical codes and ordinances. See Fig. 10–20.

1. Select set of terminal identifications (Table 1) that corre-

sponds with system type.

2. Loosen the screws for the appropriate system type

selected; see Table 1. See Table 2 for terminal designation descriptions. Insert wires in the terminal block under the loosened screw. See Fig. 9.

3. Securely tighten each screw.

4. Push excess wire back into the hole.

5. Plug the hole with nonflammable insulation to prevent

drafts from affecting the thermostat.

6. See Fig. 10–20 for typical wiring hookups.

Table 1. Selecting Terminal Identifications for System Type.

Wallplate Terminal

System Type

Identifications

Standard Heat/Cool Conventional 10, 11

Standard Multistage

Conventional 12

up to 3 Heat/2 Cool

Heat Pump with

Heat Pump 13

Auxiliary Heat

Wiring Diagram

Reference

5 68-0287—1

VISIONPRO® IAQ TOTAL HOME COMFORT SYSTEM

M23541

Fig. 9. Inserting wires in terminal block.

NOTES:

1. When used in a single-transformer system, leave the metal jumper wires in place between R and Rc, and Rc and Rh. If used on a two-transformer system, remove metal jumper wire between Rc and Rh.

2. If thermostat is configured for a heat pump system in the Installer Setup, configure changeover valve for cool (O-factory setting) or heat (B).

For wiring to a W8835 Zone panel please refer to the product data sheet included with the panel.

IMPORTANT

Use 18-gauge thermostat wire.

Table 2. Terminal Designation Descriptions.

THM5421C1008

Terminal

Designations Function

1 Terminal 1—data to/from thermostat

2 Terminal 2—power from thermostat (24Vac)

3 Terminal 3—common from thermostat

(24Vac)

C 24 Vac Transformer Common

R 24 Vac Transformer

RC 24 Vac Cooling Transformer

RH 24 Vac Heating Transformer

HUM1/HUM2 Humidification Connection (normally open)

DHM1/DHM2 Dehumidification Connection (normally

open or closed based on installer setup)

VNT1/VNT2 Ventilation connection (normally open)

W1/O/B Stage 1 Heating Relay (Conventional)

Change-over Relay (Heat Pump)

W2/AUX Stage 2 Heating Relay (Conventional)

Auxiliary Heat (fossil fuel or electric) (Heat Pump)

W3/AUX2 Stage 3 Heating Relay (Conventional)

Auxiliary Heat (fossil fuel or electric) (Heat Pump)

Y Stage 1 Compressor Relay

Y2 Stage 2 Compressor Relay

GFan Relay

L Heat Pump Equipment Monitor

OUT1/OUT2 Outdoor Temperature Sensor

IN1/IN2 Remote Indoor Temperature Sensor

DATS1/DATS2 Discharge Air Temperature Sensor

FACTORY INSTALLED JUMPER BETWEEN R, RC AND RH

WIRE TO TERMINALS ON THERMOSTAT.1

COMMUNICATION LED

COMMUNICATION TERMINALS

24 VAC

CONV. HP

O/B

AUX

AUX2

M23485

Fig. 10. Typical hookup of conventional single-stage heat

and cool system with single transformer

(1H/1C conventional).

OIL PRIMARY/ AQUASTAT

WIRE TO TERMINALS ON THERMOSTAT.1

FACTORY INSTALLED JUMPER BETWEEN R, AND RC (REMOVE FACTORY INSTALLED JUMPER BETWEEN RC AND RH

COMMUNICATION LED

COMMUNICATION TERMINALS

24 VAC

CONV. HP

O/B

AUX

AUX2

M23486

Fig. 11. Typical hookup of conventional single-stage heat

and cool system with oil primary (1H/1C conventional).

68-0287—1 6

VISIONPRO® IAQ TOTAL HOME COMFORT SYSTEM

KEY

= NORMALLY OPEN, DRY CONTACTS

= NORMALLY CLOSED, DRY CONTACTS

M23685

COMMUNICATION LED

FACTORY INSTALLED JUMPER BETWEEN R, RC AND RH

WIRE TO TERMINALS ON THERMOSTAT.

COMMUNICATION TERMINALS

24 VAC

CONV. HP

O/B

AUX

AUX2

HEAT 1 RELAY

HEAT 2 RELAY

HEAT 3 RELAY

COOL 1 RELAY

COOL 2 RELAY

FAN RELAY

M23487

Fig. 12. Typical hookup of conventional system with up to

three-stage heat and two-stage cool with one transformer

(3H/2C, 2H/2C, 2H/1C, 1H/2C, 1H/1C conventional).

FACTORY INSTALLED JUMPER BETWEEN R, RC AND RH

WIRE TO TERMINALS ON THERMOSTAT.

COMMUNICATION LED

COMMUNICATION TERMINALS

24 VAC

CONV. HP

O/B

AUX

AUX2

CHANGEOVER

AUX 1 (HEAT 3)

AUX 2 (HEAT 4)

COMP 1

COMP 2

FAN RELAY

M23488

Fig. 13. Typical hookup of heat pump system

(up to 4H/2C heat pump).

24 VAC

FIELD INSTALLED JUMPER BETWEEN R AND HUM 1

NON-POWERED

HUMIDIFIER

H1 U M2

D1 H M2

V1 N T2

M23489

24 VAC

POWERED

HUMIDIFIER

H1 U M2

D1 H M2

V1 N T2

M23490

Fig. 15. Typical hookup of powered humidifier.

24 VAC

FIELD INSTALLED JUMPER BETWEEN R AND DHM 1

LOW SPEED

FAN

H1 U M2

D1 H M2

V1 N T2

M23491

Fig. 16. Typical hookup of variable speed blower for

dehumidification in low speed (contacts normally closed).

NOTE: Connect DHM2 to low-speed fan terminal on air han-

dler for dehumidification with air conditioner and a low-speed fan.

24 VAC

H1 U M2

POWERED

DEHUMIDIFIER

D1 H M2

V1 N T2

M23492

Fig. 17. Typical hookup of powered whole house

dehumidifier (contacts normally open).

Fig. 14. Typical hookup of non-powered humidifier.

7 68-0287—1

VISIONPRO® IAQ TOTAL HOME COMFORT SYSTEM

24 VAC

FIELD INSTALLED JUMPER BETWEEN R AND VNT 1

NON-POWERED

VENTILATOR

H1 U M2

D1 H M2

V1 N T2

M23493

Fig. 18. Typical hookup of fresh air damper.

NOTE: Use this hookup for ventilation using a fresh air

damper.

24 VAC

H1 U M2

D1 H

POWERED

VENTILATOR

V1 N T2

M23494

Fig. 19. Typical hookup of powered ventilation.

POWER THE THERMOSTAT

• 24 Vac common wire only to EIM or zone panel.

Wiring 24 Vac Common

• Single-Transformer System—Connect the common side of the transformer to the C screw terminal of the EIM. Leave the metal jumper wires in place between R, Rc, and RH.

• Two-Transformer System—Connect the common side of the cooling transformer to the C screw terminal of the EIM. Remove the metal jumper wire between Rc and Rh. Connect the hot side of heating transformer to Rh and leave the jumper wire between R and Rc and connect the hot side of cooling transformer to R or Rc.

1. Locate and remove the tab labeled, Remove, in the

lower left corner on the thermostat back. See Fig. 21.

REMOVE TAB

INSTALLATION

REMOVE DURING

INSTALLATION

REMOVE DURING

M19920

Fig. 21. Remove tab labeled, Remove, on thermostat back

Mount Thermostat to Wallplate

1. Align the terminal screw blocks with the pins on the back

of the thermostat. Push the thermostat straight onto the wallplate until it snaps into place. See Fig. 22.

24 VAC

FIELD INSTALLED JUMPER BETWEEN DHM 1 AND VNT 1

BLUE

YELLOW

DH90

GREEN

RED

WHITE

FRESH

AIR

DAMPER

H1 U M2

D1 H M2

V1 N T2

M23495

Fig. 20. Hookup of Honeywell DH90 with fresh air intake for

ventilation.

68-0287—1 8

WALLPLATE

TERMINAL SCREW BLOCK

Fig. 22. Mount thermostat to wallplate.

PINS ON

BACK OF

THERMOSTAT

M23542

VISIONPRO® IAQ TOTAL HOME COMFORT SYSTEM

Locate and Mount C7089U1006 Outdoor Temperature Sensor (Optional)

Mount the sensor where (see Fig. 23):

• cannot tamper with settings.

• there is good air circulation.

• it can measure true outdoor ambient temperature.

• surface is flat.

• wire distance between C7089U1006 and EIM is less than 200 feet.

Do not mount the sensor:

• in direct sunlight.

• where hot or cold air blows on the sensor. Discharge line from an outdoor compressor unit, vent or fan causes inaccurate temperature readings.

• where snow, ice or debris can cover it.

Use the following steps to mount the sensor:

1. Remove the sensor from the mounting clip.

2. Mark the area on the location selected for mounting the

sensor mounting clip.

3. Mount the clip.

IMPORTANT

Erratic temperature readings from a sensor can occur as a result of any of the wiring practices described below. Avoid these practices to assure correct operation. Use shielded cable to reduce interference if rerouting sensor wiring is not possible.

— Be sure wires have a cable separate from the thermo-

stat cable.

— Do not route temperature sensor wiring with building

power wiring, next to control contactors or near light dimming circuits, electric motors or welding

equipment. — Avoid poor wiring connections. — Avoid intermittent or missing building earth ground.

CAUTION

Electrical Shock Hazard. Can cause electrical shock or equipment damage.

Disconnect power supply before connecting wiring.

Wiring must comply with applicable codes, ordinances and regulations:

1. Wire C7089U1006 Outdoor Sensor to OUT1and OUT2

terminals on the EIM. If leadwire provided is not long enough (60 in.), run a cable to a hole at C7089U1006 location. a. Using color-coded, 18-gauge thermostat wire is

recommended. For example of general wiring of C7089U1006, see Fig. 24.

b. Pigtail wiring can be used.

2. Mount C7089U1006 in its mounting clip.

3. Plug wiring hole using nonhardening caulk or putty.

M7514

Fig. 23. Typical locations for C7089U1006 Outdoor Sensor.

Wire C7089U1006 Outdoor Sensor

CAUTION

Electrical Interference (Noise) Hazard. Can cause erratic system operation.

Keep wiring at least one foot away from large inductive loads such as motors, line starters, lighting ballasts and large power distribution panels. Use shielded cable to reduce interference when rerouting is not possible.

WIRING HOLE

C7089

USE APPROPRIATE MOUNTING MEANS FOR THE TYPE OF STRUCTURE.

PLUG WIRING HOLE WITH NON-HARDENING CAULK OR PUTTY.

THROUGH STRUCTURE

M23525

Fig. 24. Wire C7089U1006 Outdoor Sensor to the EIM.

If an outdoor temperature sensor is installed, the thermostat displays the outside temperature in the lower right corner of the Home Screen.

9 68-0287—1

VISIONPRO® IAQ TOTAL HOME COMFORT SYSTEM

MON

THUSASUN

SCHED

HOLD

Insi

AUT

SYSTEM

HEAT

SCHED HOLD CLOCK SCREEN MORE

t T

Following

Schedule

Outside

M22453

If thermostat is set to Auto Changeover System mode, press the More key until the outside temperature is shown on the screen.

TUE WED THU FRI SAT SUN

MON

YES

5 FEET

(1.5 METERS)

Fig. 25. Typical location for C7189U1005 Indoor Sensor.

Wire C7189U1005 Indoor Sensor

CAUTION

Electrical Interference (Noise) Hazard. Can cause erratic system operation.

Keep wiring at least one foot away from large inductive loads such as motors, line starters, lighting ballasts and large power distribution panels.

M4476

Outside

SCHED

HOLD

CLOCK SCREEN

DONE

WAKE

LEAVE RETURN SLEEP CANCEL

M22448

Locate and Mount C7189U1005 Remote Indoor Temperature Sensor (Optional)

1. Choose a location (see Fig. 25) for mounting the sensor

on an inside wall about 5 ft (1.5m) above the floor.

2. Be sure wire distance between C7189U1005 and EIM is

less than 200 feet.

3. Make sure there is good air circulation at average tem-

perature at the chosen location. Avoid the following locations because they can introduce errors in sensor measurements. See Fig. 25. a. Hot areas caused by:

(a)Concealed pipes or ducts. (b)Drafts from fireplaces or other heat sources. (c)Convection or radiant heat from the sun or

electrical equipment.

b. Cold areas caused by:

(a)Concealed pipes or ducts. (b)Drafts from windows and doors. (c)Unheated areas on the other side of the wall

c. Dead air areas:

4. Mark the area on the wall selected for mounting the

C7189U1005 Sensor.

5. Run wire cable to a hole at the selected wall location.

Pull approximately three inches of wire through the opening. Color-coded, 18-gauge thermostat wire is recommended.

location.

(a)Behind doors, furniture and curtains. (b)In corners and alcoves.

IMPORTANT

Erratic temperature readings from a sensor can occur as a result of any of the wiring practices described below. Avoid these practices to assure correct operation.

— Be sure wires have a cable separate from the thermo-

stat cable.

— Do not route temperature sensor wiring with building

power wiring, next to control contactors or near light

dimming circuits, electric motors or welding equipment. — Avoid poor wiring connections. — Avoid intermittent or missing building earth ground.

CAUTION

Electrical Shock Hazard. Can cause electrical shock or equipment damage.

Disconnect power supply before connecting wiring.

Wiring must comply with applicable codes, ordinances and regulations.

1. Wire C7189U1005 Indoor Sensor to IN1and IN2 termi-

nals on the EIM. For an example of general wiring of C7189U1005, see Fig. 26 to wire one sensor and Fig. 27 to wire multiple sensors.

2. Push excess wire back into the hole. Plug the hole using

nonhardening caulk, putty or insulation to prevent drafts from affecting performance.

3. Remove C7189U1005 cover.

4. Mount C7189U1005 to the wall using the screws and

anchors provided.

5. Level the C7189U1005 for appearance only. Device

functions correctly even when not level.

6. Install C7189U1005 cover.

68-0287—1 10

1 OUT 2 OUT

1 IN

2 IN

C7189

M23523

Fig. 26. Wiring a single C7189U1005 Indoor Sensor.

1 OUT 2 OUT

1 IN 2 IN

C7189 C7189

VISIONPRO® IAQ TOTAL HOME COMFORT SYSTEM

• The thermostat will display the temperature measured at

the sensor locations (internal thermostat sensor is

disabled). Sensors must be in square numbers (e.g., 4, 9,

16, and so on) and the displayed temperature will be an

average of the temperatures measured at each location.

• The thermostat will display a 50-50 average of the

temperature measured at the thermostat location and the

average of the temperatures measured at the remote indoor

sensor locations. In this case, the thermostat sensor still

carries a 50% weighting of the displayed temperature.

Install Discharge Air Temperature Sensor (Optional):

Prior to installing Discharge Air Temperature Sensor (DATS) refer to the installation instructions included with the product for more information on placement and wiring.

When using a DATS with network zoning the DATS will monitor the duct air temperature and communicate with the thermostat and will disable the heating and/or cooling if installer set high or low temperature limits are reached.

1 OUT 2 OUT

1 IN 2 IN

C7189 C7189

C7189 C7189 C7189

C7189 C7189

C7189

M23524

Fig. 27. Wiring Multiple C7189U1005 Sensors.

If a remote indoor temperature sensor is installed, the thermostat has several options for displaying the current indoor temperature. This is configured in ISU 340. The thermostat can display either the temperature measured at the thermostat location, the sensor location, or a 50-50 average of both.

ONE REMOTE INDOOR SENSOR INSTALLED (OPTIONAL)

If one remote indoor temperature sensor is used, based on configuration during installer setup, either of the following options are available:

When using a DATS with an Equipment Interface Module the DATS is for testing only. When the installer is in any of the Installer Tests pressing the “More” button will display the temperature measured at the DATS. This allows the installer to view the temperature of each stage of heating and or cooling. The DATS will not be used for control and will not disable heating or cooling based on duct air temperature.

Set Calendar and Time

Thermostat keeps current time and day for up to ten years under normal use after the calendar is set.

When the thermostat is first powered, the display is ready to set the calendar and time.

NOTE: Calendar can also be set in the Installer Setup.

1. Press the arrow keys to set the year, month and day.

2. Press the Done key.

SET CURRENT DAY SET MONTH

WEWETHTHFRFRSSAASU

OK TO PICK MULTIPLE DAYS SCREEN LOCKED

CHANGE FILTER UV LAMP

• The thermostat will display the temperature measured at the sensor location (internal thermostat sensor is disabled).

• The thermostat will display a 50-50 average of the temperature measured at the thermostat location and the remote indoor sensor location.

MULTIPLE REMOTE INDOOR SENSORS INSTALLED (OPTIONAL)

If more than one remote indoor sensor is used, based on configuration during installer setup, either of the following options are available:

DONE

USE ARROWS TO SET YEAR AND TIME

M22424

3. Press the arrow keys to set the current time.

4. Press the Done Key.

11 68-0287—1

VISIONPRO® IAQ TOTAL HOME COMFORT SYSTEM

USE ARROWS TO SET YEAR AND TIME

1. Press and release the System Key.

DON

M22425

INSTALLER SETUP

Auto Discover is available when the TH9421C thermostat is connected to an EIM. The EIM communicates information to the thermostat. Thermostat settings can be specified using the up and down arrow keys on the screen or set to Auto Discover.

Using Auto Discover

Some Installer setups are defaulted to Auto Discover. If not defaulted, the installer can change the option to Auto Discover, however, it is always important that the installer verify that the auto discovered values are correct for the system that is present.

FAN

Inside

AUTO

SYSTEM

EM HEAT

OFF

COOL

SCHED HOLD CLOCK

THU

Following Schedule

A M

Humidity

SCREEN

M23498

2. Press and hold the two blank keys on either side of the

center blank key for approximately five seconds until screen changes.

TU WEWETHTHFRFRSSAASU

OK TO PICK MULTIPLE DAYS SCREEN LOCKED

CHANGE FILTER UV LAMP

SYSTE

HEAT

OFF

DONE

Inside

Set

Following Schedule

Humidity

CANCEL

When using the thermostat with an equipment interface module, Auto Discover will discover factory default settings and will not receive communications as to proper system settings. The equipment interface module is preprogrammed at the factory as a one heat one cool product and the thermostat will “auto discover” those settings. The equipment interface module will be reprogrammed when the installer manually changes the configuration in the installer set up. It is not recommended to use Auto Discover with an equipment interface module.

When using the VisionPRO® IAQ thermostat with a W8835 zone panel, configure the zone panel, using the DIP switches on the panel, for the proper system settings. Enter the installer setup on each thermostat and assign zone numbers, and change the system settings (ISU 172–180) to Auto Discover (E) then press the discover button on the zone panel. The zone panel will then communicate those settings back to the thermostats and the thermostats will automatically configure the ISU settings in Auto Discover, again it is important to verify that the auto discovered values are correct.

NOTE: When a VisionPRO® IAQ thermostat is being added

to an existing zoning system with T8635 Thermostats the new VisionPRO® IAQ must be set up as the Zone One Thermostat (master zone controller), and can only be used with a W8835 zone panel.

Follow these steps to enter the Installer Setup:

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3. Release the two blank keys when the screen on the ther-

mostat matches the screen below.

DONE

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