Honeywell Home Thx9421r5021ww

Prestige® IAQ with Equipment Interface Module

Installation Guide



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RedLINK to Equipment Interface Module







TM


2 Wires for Power

######## OR

RedLINK to TrueZONE Wireless Adapter







TM


2 Wires for Power

Reference to key features


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###### * Password is date code.

Current display. Button pressed in signifies current display

Mode control buttons. Use to change settings for Fan or System Heat/Cool.

Menu. Select options to: set schedules, view equipment status, change IAQ settings, access installer options*, etc.

Current schedule. Shows desired temperature and schedule status.

Indoor conditions. Shows indoor temperature and humidity.

Current date and time. Current status. Shows system mode (heat/cool), outdoor temperature and humidity (with optional outdoor sensor). USB port. Use USB device to load settings and dealer information.

Getting started

Follow these basic steps to install this thermostat, link it with the equipment interface module (EIM) and wireless accessories and set installer options.

Thermostat (back view)

1624THX9421R5021WW

2

Residential/Résidentiel 1-800-468-1502 HoneywellHome.com 1-888-245-1051 ForwardThinking.HoneywellHome.com

Model: THX9421R02 FCC ID: HS9-THX9421R02 IC: 573R-THX9421R02

Resideo, Golden Valley, MN 55422 RoHs Compliant/Conformité RoHs Country of origin:/Pays d’origine : Mexico

Password (Date Code)

1624THX9421R5021WW

2

Residential/Résidentiel 1-800-468-1502 HoneywellHome.com 1-888-245-1051 ForwardThinking.HoneywellHome.com

Model: THX9421R02 FCC ID: HS9-THX9421R02 IC: 573R-THX9421R02

Resideo, Golden Valley, MN 55422 RoHs Compliant/Conformité RoHs Country of origin:/Pays d’origine : Mexico

1 Installing the equipment interface module (EIM)

NOTE: If an EIM is mounted inside a metal cabinet, it is recommended to use a THM4000R1000 Wireless Adapter for extended wireless range. Mount the Wireless Adapter outside the metal cabinet and connect to the ABCD terminals at the EIM.

NOTE: When installing multiple thermostats and EIMs, mount the EIMs at least 2 feet apart for best RedLINK 2.0 performance.

R C

Use screws and anchors as appropriate for the mounting surface.

B

WO/

Y Y2 G

A

AL/

MCR32389B

############ MCR34177

NOTE: If you are installing discharge and return air sensors, refer to the mounting instructions in the Alerts and Delta T Diagnostics Installation Instructions packed in the kit.

##### Terminal Designations

|Conventional System|Conventional System|Heat Pump|Heat Pump| |---|---|---|---| |Terminal|Description|Terminal|Description| |C|Common wire from 24 VAC transformer.|C|Common wire from 24 VAC transformer.| |R*|Power wire from 24 VAC transformer.|R|Power wire from 24 VAC transformer.| |RH*|Heating power.|RH|Heating power.| |RC*|Cooling power.|RC|Cooling power.| |W|Heat Stage 1|O/B|Changeover valve for heat pumps.| |W2|Heat Stage 2|AUX 1|Backup Heat Stage 1/Emergency Heat Stage 1| |W3|Heat Stage 3|AUX 2|Backup Heat Stage 2/Emergency Heat Stage 2| |Y|Compressor Stage 1|Y|Compressor Stage 1| |Y2|Compressor Stage 2|Y2|Compressor Stage 2| |G|Fan Relay|G|Fan Relay| |A|Connect to Economizer Module or Lighting Panel (TOD).|L/A|Connect to Compressor Monitor, Zone Panel, Economizer Module or Lighting Panel (TOD).|

##### Terminal Designations

|Conventional System|Conventional System|Heat Pump|Heat Pump| |---|---|---|---| |Terminal|Description|Terminal|Description| |U1 / U1
U2 / U2
U3 / U3
|Relay for humidification, dehumidification, ventilation, or a stage of heating/cooling. U terminals are dry contacts that require power.|U1 / U1
U2 / U2
U3 / U3
|Relay for humidification, dehumidification, ventilation, or a stage of heating/cooling. U terminals are dry contacts that require power.| |S1 / S1*
S2 / S2*
S3 / S3*
S4 / S4*
|Input for a wired indoor sensor, outdoor sensor, discharge sensor, return sensor, dry contact device for alerts or dry contact device for remote setback.|S1 / S1*
S2 / S2*
S3 / S3*
S4 / S4*
|Input for a wired indoor sensor, outdoor sensor, discharge sensor, return sensor, dry contact device for alerts or dry contact device for remote setback.| |A
B
C
D
|Connect to THM4000R1000 Wireless Adapter for extended wireless range.|A
B
C
D
|Connect to THM4000R1000 Wireless Adapter for extended wireless range.|

*** See wiring diagram below for wiring Dry Contact Devices to display alerts.

Wiring dry contact devices to display alerts

DISCONNECT POWER BEFORE INSTALLATION. Do not apply power to S1, S2, S3 or S4 terminals.

EIM

NOTE: The dry contact device must be rated for low voltage.

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Connect a dry contact device such as a water sensor to S1, S2, S3 or S4 terminals. The thermostat displays an alert when a problem is detected.

ONE DRY CONTACT DEVICE

MULTIPLE DRY CONTACT DEVICES ON ONE SET OF TERMINALS

M31488

Connecting a stage of heating or cooling to a relay (U1, U2, U3)

U1, U2, and U3 are normally open dry contacts when set up for a stage of heating or cooling. You must install a field jumper if the stage of heating or cooling is powered by the system transformer. Do NOT install a field jumper if the stage of heating has its own transformer.

U3

U3

U2

HEAT STAGE 3, COOL STAGE 3, COOL STAGE 4 OR GEOTHERMAL RADIANT HEAT

U2

U1

1

U1

2

RH

RC

TRANSFORMER

R

24 VAC

120 VAC

24 VAC

C

MCR34212

Wiring humidification, dehumidification and ventilation

Typical hookup of powered humidifier Typical hookup of non-powered humidifier

U3 U3 U2 U2 U1 U1

1

24 VAC

120 VAC

POWERED HUMIDIFIER

RH RC R C

|120 VAC| |---|

24 VAC

24 VAC

M32393A

U3 U3 U2 U2 U1 U1

1

NON-POWERED HUMIDFIER

FIELD INSTALLED JUMPER BETWEEN R AND U1

RH RC R C

120 VAC

24 VAC

24 VAC

MCR32397B

Typical hookup of powered ventilation

U3 U3

M32396A

24 VAC

120 VAC

24 VAC

120 VAC

1

POWERED DEHUMIDIFIER

RH RC R C

U3 U3

POWERED VENTILATOR

RH RC R C

24 VAC

Typical hookup of non-powered ventilation

U3 U3 U2 U2 U1 U1

1

NON-POWERED HUMIDFIER

FIELD INSTALLED JUMPER BETWEEN R AND U1

RH RC R C

120 VAC

24 VAC

24 VAC

MCR32397B

Typical hookup of powered dehumidifier (whole house dehumidifer)

24 VAC

120 VAC

24 VAC

24 VAC

|120 VAC| |---|

M32398A

Typical hookup of variable speed blower for dehumidification in low speed

U3 U3 U2 U2 U1 U1

1

2

DEHUMIDIFICATION WITH LOW SPEED FAN

OR

FIELD INSTALLED JUMPER BETWEEN R AND U1

RH RC R C

120 VAC

24 VAC

24 VAC

MCR32392A

Any combination of relays (U1, U2, U3) can be used. They are set in the thermostat installer setup.

Wire the EIM relay to the low speed fan for dehumidification control at the equipment. The EIM relay can be set to be normally open or normally closed in the thermostat installer setup.

Normally open, dry contacts Normally closed, dry contacts

2 Installing the thermostat

Drill 3/16-in holes for drywall.

Drill 7/32-in holes for plaster.

NOTE: Coin cell battery saves time and date during a power loss.

Thermostat (back view)

1324

M34203

Wallplate (back view)

Wallplate

R C

MCR34204

Wallplate

MCR34222

Coin cell battery

1324

########### MCR34205

Thermostat (back view)

2.5 Mount thermostat on wallplate. Align thermostat to wallplate and snap into place.

Wallplate

R C

M34206

Thermostat

3.2b

3.2a

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M36568A

4 Performing initial setup

Initial setup options define the type of system you are installing:

4.1 Follow prompts on the screen to select appropriate options. NOTE: If you are connecting the thermostat to the TrueZONE Wireless Adapter (THM4000), refer to the TrueZONE instructions to link the thermostat and RedLINK 2.0 accessories. Then go to step 4.5. Next


NOTE: If the “Connected” light does NOT flash green, another system may be in the listening mode. Please exit the listening mode at the other system and then try again.

CONNECTED

CONNECT

MCR34176A


Next


Next

##### 4.3 When you see the prompt Do youhave RedLINK 2.0 accessories toconnect? Touch Yes or No.


##### 4.4 Connect each RedLINK 2.0accessory.

NOTE: Make sure accessories are at least 2 feet away from the EIM during the linking process.

NOTE: The thermostat displays a countdown timer while in listening mode. If it detects no activity for 15 minutes, it exits listening mode.

###### 4.5 Finish the initial setup.Finish the setup by selecting thedesired options. Touch Done after youselect the last option you want tochange.


Listening mode



Done

Listening mode


The thermostat now displays its Home screen and the thermostat setup is complete.


5 Finding your password (Date Code)

Thermostat (back view)

##### Finding your password

1624THX9421R5021WW

2

Residential/Résidentiel 1-800-468-1502 HoneywellHome.com 1-888-245-1051 ForwardThinking.HoneywellHome.com

You can find the Date Code on the back of the thermostat, or

Model: THX9421R02 FCC ID: HS9-THX9421R02 IC: 573R-THX9421R02

Resideo, Golden Valley, MN 55422 RoHs Compliant/Conformité RoHs Country of origin:/Pays d’origine : Mexico

Password (Date Code)

1624THX9421R5021WW

2

Residential/Résidentiel 1-800-468-1502 HoneywellHome.com 1-888-245-1051 ForwardThinking.HoneywellHome.com

Model: THX9421R02 FCC ID: HS9-THX9421R02 IC: 573R-THX9421R02

Resideo, Golden Valley, MN 55422 RoHs Compliant/Conformité RoHs Country of origin:/Pays d’origine : Mexico


Dealer Informa on


1624

OK

Linking RedLINK 2.0 accessories to the thermostat

NOTE: Accessories must be at least 2 feet away from the EIM during the linking process.

NOTE: Thermostat displays a countdown timer while in listening mode. If it detects no activity for 15 minutes, it exits listening mode.


Installer Op ons


######### Done


Wireless Device Manager


Add Device


Listening mode



########## Done

Listening mode

Making changes to Installer Setup and performing Installer Test

Follow these steps to set system options after initial installation.

NOTE: Use a USB device to save set up time. See page 14.


Installer Op ons


Done


Mounting outdoor and indoor sensors

##### Mounting an outdoor sensor

M28491B

M28849A

##### Mounting an indoor sensor

M32936B

Indoor sensor operation

##### Temperature control

The thermostat can be set to respond to its internal temperature sensor, or to an optional remote indoor sensor. If multiple sensors are selected, the thermostat will respond to an average of temperatures detected at each sensor.


##### Humidification control

If optional remote indoor sensors are installed, you can choose which sensor you want to use for humidification control. You can use a different sensor for dehumidification.


##### Dehumidification control

If optional remote indoor sensors are installed, you can choose which sensor you want to use for dehumidification control. For example, you can use one sensor for humidification control, and another for dehumidification.


Using a USB device for setup, data logs and software upgrades

NOTE:Modern USBs with over 8 MB may have compatibility issues.

Use a USB device to save set up time by loading Installer Setup settings, Dealer Information, Holiday Schedules, and Custom Reminders to multiple thermostats. For troubleshooting help, you can save the thermostat Data Logs (Alerts Log, User Interactions Log and Performance Logs) to a USB device - then view them on your computer. Also use the USB device to upgrade the thermostat software.

To use the USB device in the thermostat:

M34201

When you replace a thermostat, you must reset the RedLINK 2.0 accessories before connecting them to the new thermostat. Follow the instructions below.

At the Portable Comfort Control:

Press and hold the blank space (or arrow) in the lower right corner of the screen until the display changes (hold for about



Load Installer Setup into Thermostat

To replace a thermostat

Portable Comfort Control

At the Indoor Sensor, RedLINK 2.0 Internet Gateway, Entry/ Exit Remote, Vent-Filter Boost Remote or TrueSteam Wireless Adapter:

Press and hold the CONNECT button on the accessory until the status light glows amber (hold for about 10 seconds). To reconnect the thermostat, go to Step 4.3.

MCR32958C

Press and hold

##### At the Equipment Interface Module (EIM):

Press and hold the CONNECT button on the EIM until the CONNECTED LED glows amber (hold for about 10 seconds). Follow the prompts on the screen to connect the new thermostat to the EIM. To reconnect the thermostat, go to Step 4.2.

#### Specifications and replacement parts

Operating Ambient Temperature Thermostat: 32 to 120° F (0 to 48.9° C) Portable Comfort Control: 32 to 120° F (0 to 48.9° C) Wireless Outdoor Sensor: -40 to 140° F (-40 to 60° C) Wireless Indoor Sensor: 0 to 120° F (-17.8 to 48.9° C)

-For Optimal Battery Life: 35 to 114° F (1.7 to 45.6° C) Equipment Interface Module: -40 to 165° F (-40 to 73.9° C) Return Air Sensor: 0 to 200° F (-17.8 to 93.3° C) Discharge Air Sensor: 0 to 200° F (-17.8 to 93.3° C) RedLINK 2.0 Internet Gateway: 32 to 120° F (0 to 48.9° C)

Operating Relative Humidity Thermostat: 5% to 90% (non-condensing) Portable Comfort Control: 5% to 90% (non-condensing) Wireless Outdoor Sensor: 0% to 100% (condensing) Wireless Indoor Sensor: 5% to 90% (non-condensing) Equipment Interface Module: 5% to 95% (non-condensing) RedLINK 2.0 Internet Gateway: 5% to 95% (non-condensing)

Physical Dimensions (height, width, depth) Thermostat: 4-1/2 x 3-1/2 x 7/8 inches (115 mm x 88 mm x 22 mm) Equipment Interface Module: 9-5/16 x 4-13/16 x 1-19/32 inches (91 x 147 x 42 mm) Wireless Outdoor Sensor: 5 x 3-1/2 x 1-11/16 inches (127 x 89 x 43 mm) Wireless Indoor Sensor: 2-7/8 x 1-7/8 x 15/16 inches (74 x 48 x 24 mm) Portable Comfort Control: 6-1/4 x 3-1/8 x 1-5/8 inches (158 x 80 x 38 mm) RedLINK 2.0 Internet Gateway: 3-7/8 x 3-9/16 x 1-1/8 (99 x 91 x 29 mm)

RedLINK 2.0 Communication Frequency: 900 Mhz frequency range Re-Sync Time: RedLINK devices re-establish communication within 6 minutes after AC power resumes.

Electrical ratings

|Terminal|Voltage (50/60 Hz)|Max. Current Rating| |---|---|---| |W - OB|18 to 30 VAC and 750 mVDC|1.00A| |Y (cooling)|18 to 30 VAC|1.00A| |G (fan)|18 to 30 VAC|0.50A| |W2 - Aux 1 (heating)|18 to 30 VAC|0.60A| |W3 - Aux 2|18 to 30 VAC|0.60A| |Y2 (cooling)|18 to 30 VAC|0.60A| |A-L/A (output)|18 to 30 VAC|1.00A| |U1|30 VAC max.|0.50A| |U2|30 VAC max.|0.50A|

|U3|30 VAC max.|0.50A|

Accessories and replacement parts

|Accessories / Replacement Parts|Part Number| |---|---| |Equipment Interface Module|THM5421R1021| |Wireless Adapter for TrueZone, TrueSteam, or extend wireless range of EIM|THM4000R1000| |RedLINK Internet Gateway|THM6000R7001| |Wireless Entry/Exit Remote|REM1000R1003| |Wireless Vent and Filter Boost Remote|HVC20A1000| |Portable Comfort Control|REM5000R1001| |Wireless Outdoor Sensor|C7089R1013| |Wireless Indoor Sensor|C7189R1004| |Wired Outdoor Sensor 10k ohm NTC|C7089U1006| |Wired Wall-mount Indoor Sensor 10k ohm NTC|C7189U1005| |Supply or Return Air Sensor 10k ohm NTC|C7735A1000| |Occupancy Sensor for Remote Setback|WSK-24| |Cover Plate (covers marks left by old thermostats)|THP2400A1027W|

DISCONNECT POWER BEFORE INSTALLATION. Can cause electrical shock or equipment damage.

This thermostat contains a Lithium battery which may contain Perchlorate material. Perchlorate Material—special handling may apply. See www.dtsc.ca.gov/hazardouswaste/perchlorate

CAUTION: MERCURY NOTICE: If this product is replacing a control that contains mercury in a sealed tube, do not place the old control in the trash. Contact your local waste management authority for instructions regarding recycling and proper disposal.

CAUTION: ELECTRONIC WASTE NOTICE: The product and batteries should not be disposed of with other household waste. Check for the nearest authorized collection centers or authorized recyclers. The correct disposal of end-of-life equipment will help prevent negative consequences for the environment and human health.

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Must be installed by a trained, experience technician. Read these instructions carefully. Failure to follow these instructions can damage the product or cause a hazardous condition.

Need Help? For assistance please visit http://customer.resideo.com,

or call toll-free: 800-468-1502

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############# TM

Resideo Inc., 1985 Douglas Drive North Golden Valley, MN 55422

www.resideo.com 69-2739—09 SA Rev. 05-23 | Printed in United States

©2023 Resideo Technologies, Inc. This product is manufactured by Resideo Technologies, Inc., Golden Valley, MN, 1-855-733-5465. The Honeywell Home trademark is used under license from Honeywell International Inc. All rights reserved. 69-2739-09