Honeywell THM5421C1008 Thermostat User Manual

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VisionPRO IAQ

Total Home Comfort System

PRODUCT DATA

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.

•

Advanced heat pump control featuring balance point

plus 2°F droop to increase homeowner comfort.

APPLICATION

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..........................................................

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

Installation ........................................................................

Wiring ...............................................................................

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

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

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

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

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

8-0287-1

VISIONPRO^®IAQ TOTAL HOME COMFORT SYSTEM

SPECIFICATIONS

Thermostat Description:

Finish:

VisionPRO IAQ Thermostats: Premier White color.

THM5421C1008: Premier White color.

C7189U1005 Wall Mount Remote Indoor Sensor: Premier

Feature

Description

Common wire only

Powering method

•

White color.

System types (up to • Gas, oil or electric heat with air

Clock Accuracy: +/- 1 minute per year.

heat/2 cool)

conditioning

•

Warm air, hot water, high-efficiency

furnaces, heat pumps, steam and

gravity

Heat only with fan

Cool only

Resistance Characteristics of Remote Sensors:

C7089U1006 Outdoor Sensor: Negative temperature coeffi-

cient (NTC) means that resistance decreases as the tem-

perature 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 sec-

tion for sensor resistance characteristics.

•

Changeover

System setting

Fan setting

Manual or Auto changeover selectable

Heat-Off-Cool-Auto

Auto-On-Circ

Electrical Ratings:

Cool Indication:

VisionPRO IAQ Comfort Systems show “Cool On” on the

thermostat screen when Cool is activated.

Terminal

Voltage (50/60 Hz) Running Current

W1 Heating

20 - 30 Vac

.02 - 1.0A

Heat Indication:

VisionPRO IAQ Comfort Systems show “Heat On” on the

W2/Aux Heating 20 - 30 Vac

W3/Aux2 Heating 20 - 30 Vac

thermostat screen when Heat is activated.

Y Cooling

Y2 Cooling

G Fan

20 - 30 Vac

Auxiliary Heat Indication:

VisionPRO IAQ Comfort Systems show “Aux. Heat On” on

the thermostat screen when Auxiliary Heat is activated.

Calibration:

Temperature Setting Range:

C7089U1006, C7189U1005 and VisionPRO IAQ Comfort Sys-

Heating: 40°F to 90°F(4.5°C to 32°C).

Cooling: 50°F to 99°F (10°C to 37°C).

tems are factory-calibrated and require no field calibration.

Interstage Differential:

Operating Ambient Temperature:

VisionPRO IAQ Comfort Systems operate with droopless

VisionPRO^®IAQ Thermostats: 0°F to 120°F

control. Once the thermostat senses that 1st stage is run-

(-18°C to 49°C).

ning at 90% capacity, the thermostat energizes 2nd stage.

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).

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. junc-

tion box.

Shipping Temperature:

VisionPRO^®IAQ Thermostats: -30°F to 150°F

(

-34°C to 66°C).

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.

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%.

C7189U1005 Remote Indoor Sensor: Mounts directly on the

wall using mounting screws and anchors provided.

C7089U1006: 5% to 95%.

C7189U1005: 5% to 95%.

Cover Plate:

2003796-001 Cover Plate is used to cover marks left on the

wall by the old thermostat.

Humidification Setting Range:

Heating: 10% to 60% RH.

Dimensions:

VisionPRO IAQ Comfort System: see Fig. 1.

Dehumidification Setting Range:

Heating: 40% to 80% RH.

THM5421C1008: see Fig. 2

C7089U1006 Outdoor Sensor Mounting Clip: see Fig. 3.

Humidity Display Range:

32003796-001 Cover Plate: see Fig. 4.

C7189U1005 Remote Indoor Sensor: see Fig. 5.

0% to 99%.

Cycle Rates (at 50% Load):

Heating: Selectable 1 - 12 cycles per hour.

Cooling: Selectable 1 - 6 cycles per hour.

8-0287—1

VISIONPRO^®IAQ TOTAL HOME COMFORT SYSTEM

WALLPLATE

-3/8 (86)

1-1/2 (38)

-3/8 (86)

M4488

THERMOSTAT

AND WALLPLATE

-3/8 (35)

Fig. 3. C7089U1006 Outdoor Sensor Mounting Clip

dimensions in in. (mm).

THERMOSTAT

(152)

-7/8 (200)

-5/16 (84)

4-9/16

(116)

-1/2

140)

(

-5/16

84)

(

M23539

Fig. 1. VisionPRO^®IAQ Comfort System

dimensions in in. (mm).

M22139

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

7-9/32

(185)

-57/64

175)

(

-35/64

116)

1-21/64

(34)

(

FRONT VIEW

SIDE VIEW

M23544

Fig. 2. THM5421C1008 Equipment Interface Module

dimensions in in. (mm).

68-0287—1

VISIONPRO^®IAQ TOTAL HOME COMFORT SYSTEM

-9/32

58)

2-9/32

(58)

(

-1/2 (38)

45/64

18)

1-1/2 (38)

(

M23522

FRONT VIEW

SIDE VIEW

FRONT VIEW (COVER OFF)

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

Do not install the thermostat where it can be affected by:

INSTALLATION

—

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.

When Installing this Product...

Read these instructions carefully. Failure to follow the

instructions can damage the product or cause a hazard-

ous condition.

Check the ratings given in the instructions to make sure

the product is suitable for your application.

Installer must be a trained, experienced service

technician.

After completing installation, use these instructions to

verify the product operation.

Installing Wallplate

CAUTION

Electrical Hazard.

Can cause electrical shock or equipment damage.

Disconnect power before wiring.

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.

The thermostat can be mounted horizontally on the wall or on a

in. x 2 in. (101.6 mm x 50.8 mm) wiring box.

Position and level the wallplate (for appearance only).

Use a pencil to mark the mounting holes.

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.

YES

5 FEET

[

1.5 METERS]

M19925

Fig. 6. Selecting thermostat location.

8-0287—1

VISIONPRO^®IAQ TOTAL HOME COMFORT SYSTEM

Position the wallplate over the holes, pulling wires

through the wiring opening. See Fig. 7.

Insert the mounting screws into the holes and tighten.

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

startup, and while checking equipment status (Auto

Discover mode).

WALL

WIRES THROUGH WALL

AND WIRE SLOT

WALL ANCHORS (2)

WALL ANCHOR

COMMUNICATION LED

MOUNTING

HOLES

DRILL 3/16 IN. HOLES

FOR DRYWALL. DRILL

M23541

/32 IN. HOLES FOR

PLASTER

MOUNTING

SCREWS (2)

M23543

Fig. 7. Mounting wallplate.

Installing Equipment Interface Module (EIM)

MOUNTING SCREW

M23484

CAUTION

Electrical Hazard.

Fig. 8. Mounting EIM.

Can cause electrical shock or equipment damage.

Disconnect power before wiring.

WIRING

The EIM can be mounted vertically on the HVAC equipment or

on a wall in the equipment room.

All wiring must comply with local electrical codes and

ordinances. See Fig. 10–20.

Position the EIM.

Use a pencil to mark the mounting holes.

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.

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

sponds with system type.

Loosen the screws for the appropriate system type

selected; see Table 1. See Table 2 for terminal designa-

tion descriptions. Insert wires in the terminal block under

the loosened screw. See Fig. 9.

Position the wallplate over the holes, pulling wires

through the wiring opening.

Insert the mounting screws into the holes and tighten.

See Fig. 8.

Securely tighten each screw.

Push excess wire back into the hole.

Plug the hole with nonflammable insulation to prevent

drafts from affecting the thermostat.

See Fig. 10–20 for typical wiring hookups.

Communication LED

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

status as follows.

Table 1. Selecting Terminal Identifications for System Type.

Wallplate Terminal Wiring Diagram

•

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.

System Type

Identifications

Reference

10, 11

Standard Heat/Cool Conventional

StandardMultistage Conventional

up to 3 Heat/2 Cool

•

LED always off: Wiring problem. Check wiring to terminals

, 2, 3.

Heat Pump with

Auxiliary Heat

Heat Pump

LED always on: EIM may need replacement.

68-0287—1

VISIONPRO^®IAQ TOTAL HOME COMFORT SYSTEM

NOTES:

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 sys-

tem, remove metal jumper wire between Rc and Rh.

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.

M23541

Fig. 9. Inserting wires in terminal block.

IMPORTANT

COMMUNICATION LED

COMMUNICATION

TERMINALS

Use 18-gauge thermostat wire.

CONV. HP

W1 O/B

Table 2. Terminal Designation Descriptions.

W2 AUX

4 VAC

W3 AUX2

THM5421C1008

Terminal

Designations

Y2 Y2

Function

Terminal 1—data to/from thermostat

Terminal 2—power from thermostat (24Vac)

Terminal 3—common from thermostat

FACTORY INSTALLED

JUMPER BETWEEN R,

RC AND RH

WIRE TO TERMINALS ON THERMOSTAT.

M23485

(24Vac)

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

and cool system with single transformer

24 Vac Transformer Common

24 Vac Transformer

(

1H/1C conventional).

24 Vac Cooling Transformer

24 Vac Heating Transformer

Humidification Connection (normally open)

HUM1/HUM2

DHM1/DHM2

COMMUNICATION LED

COMMUNICATION

TERMINALS

CONV. HP

W1 O/B

Dehumidification Connection (normally

open or closed based on installer setup)

W2 AUX

4 VAC

AUX2

VNT1/VNT2

W1/O/B

Ventilation connection (normally open)

Stage 1 Heating Relay (Conventional)

Change-over Relay (Heat Pump)

Y2 Y2

W2/AUX

Stage 2 Heating Relay (Conventional)

Auxiliary Heat (fossil fuel or electric) (Heat

Pump)

OIL PRIMARY/

AQUASTAT

FACTORY INSTALLED JUMPER BETWEEN R,

AND RC (REMOVE FACTORY INSTALLED

JUMPER BETWEEN RC AND RH

W3/AUX2

Stage 3 Heating Relay (Conventional)

Auxiliary Heat (fossil fuel or electric) (Heat

Pump)

WIRE TO TERMINALS ON THERMOSTAT.

M23486

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

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

Stage 1 Compressor Relay

Stage 2 Compressor Relay

Fan Relay

Heat Pump Equipment Monitor

Outdoor Temperature Sensor

Remote Indoor Temperature Sensor

OUT1/OUT2

IN1/IN2

DATS1/DATS2 Discharge Air Temperature Sensor

8-0287—1

VISIONPRO^®IAQ TOTAL HOME COMFORT SYSTEM

KEY

NORMALLY OPEN, DRY CONTACTS

4 VAC

NORMALLY CLOSED, DRY CONTACTS

M23685

POWERED

HUMIDIFIER

HEAT 1 RELAY

COMMUNICATION LED

COMMUNICATION CONV. HP

TERMINALS

W1 O/B

HEAT 2 RELAY

HEAT 3 RELAY

COOL 1 RELAY

COOL 2 RELAY

FAN RELAY

M23490

W2 AUX

4 VAC

W3 AUX2

Fig. 15. Typical hookup of powered humidifier.

Y2 Y2

FACTORY INSTALLED

JUMPER BETWEEN R,

RC AND RH

4 VAC

WIRE TO TERMINALS ON THERMOSTAT.

M23487

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

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

FIELD INSTALLED

JUMPER BETWEEN

R AND DHM 1

(

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

LOW SPEED

FAN

CHANGEOVER

COMMUNICATION LED

COMMUNICATION CONV. HP

TERMINALS

W1 O/B

AUX 1 (HEAT 3)

AUX 2 (HEAT 4)

COMP 1

M23491

W2 AUX

Fig. 16. Typical hookup of variable speed blower for

dehumidification in low speed (contacts normally closed).

4 VAC

W3 AUX2

Y2 Y2

COMP 2

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

dler for dehumidification with air conditioner and a

low-speed fan.

FAN RELAY

FACTORY INSTALLED

JUMPER BETWEEN R,

RC AND RH

WIRE TO TERMINALS ON THERMOSTAT.

M23488

Fig. 13. Typical hookup of heat pump system

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

4 VAC