Honeywell YTHX9421, THX9421R5021WW User Manual

Prestige® IAQ
with Equipment Interface Module

Installation Guide

TM

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

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).

* Password is date code.

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.

Installing the Equipment Interface

1

Module (EIM)

Installing the thermostat

2

Powering optional RedLINK accessories

3

Performing initial setup

4

Finding your password (Date Code)

5

• To add or remove RedLINK accessories

• To make changes to Installer Setup

• To perform an Installer Test

• To view Data Logs

USB port. Use USB device to load
settings and dealer information.

Thermostat (back view)

1624

Password
(Date Code)

1624

2

Installing the equipment interface module (EIM)

1

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 performance.

1.1 Mount EIM.
Mount the EIM near the HVAC
equipment or on the equipment
itself.

Use screws and anchors as
appropriate for the mounting
surface.

1.2 Wire EIM as shown.
Refer to the table and wiring diagrams on pages 35.

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.

R

C

W

O/B

W2

AUX1

W3

AUX2

Y

Y2

G

A

L/A

Terminal Designations

Conventional System Heat Pump

Terminal Description Terminal Description

R*

Common wire from 24 VAC

C

transformer.

Power wire from 24 VAC
transformer.

Common wire from 24 VAC

C

transformer.

Power wire from 24 VAC

R

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

W3 Heat Stage 3 AUX 2

Backup Heat Stage 1/Emergency
Heat Stage 1

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

Connect to Economizer Module or

A

Lighting Panel (TOD).

L/A

Connect to Compressor Monitor,
Zone Panel, Economizer Module
or Lighting Panel (TOD).

* Remove jumpers when separate transformers are used.

3

Terminal Designations

2

ONE DRY CONTACT DEVICE

Conventional System Heat Pump

Terminal Description Terminal Description

Universal relay for
humidification,
dehumidification, ventilation,
or a stage of heating/cooling. U
terminals are dry contacts that
require power.

Universal input for a wired
indoor sensor, outdoor sensor,
discharge sensor, return sensor,
dry contact device for alerts or
dry contact device for remote
setback.

U1 / U1**
U2 / U2**
U3 / U3**

S1 / S1***
S2 / S2***
S3 / S3***
S4 / S4***

Universal relay for humidification,
dehumidification, ventilation,
or a stage of heating/cooling. U
terminals are dry contacts that
require power.

Universal input for a wired indoor
sensor, outdoor sensor, discharge
sensor, return sensor, dry contact
device for alerts or dry contact
device for remote setback.

U1 / U1**
U2 / U2**
U3 / U3**

S1 / S1***
S2 / S2***
S3 / S3***
S4 / S4***

A
B
C
D

** See wiring diagrams on pages 45.
*** See wiring diagram below for wiring Dry Contact Devices to display alerts.

Connect to THM4000R1000
Wireless Adapter for extended
wireless range.

A
B
C
D

Connect to THM4000R1000
Wireless Adapter for extended
wireless range.

Wiring dry contact devices to display alerts

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

NOTE: The dry contact device must

EIM

be rated for low voltage.

MULTIPLE DRY CONTACT DEVICES

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.

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

U3

1

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 trans-

1

former. Do NOT install a field
jumper if the stage of heating
has its own transformer.

4

VAC

U3

U2

HEAT STAGE 3,

U2

COOL STAGE 3,

COOL STAGE 4 OR

U1

GEOTHERMAL

RADIANT HEAT

U1

2

RH

RC

R

24

C

ON ONE SET OF TERMINALS

TRANSFORMER

24

VAC

120
VAC

VA

24

VA

VA

24

1

2

Wiring humidification, dehumidification and ventilation

Typical hookup of powered humidifier Typical hookup of non-powered

humidifier

U3

1

U3
U2

U2

U1

POWERED

HUMIDIFIER

U1

RH

RC

R

24

C

C

VAC

24

VAC

24

120

VAC

120

VAC

Typical hookup of powered ventilation

U3

1

U3
U2

U2

U1

POWERED

VENTILATOR

U1

RH

RC

R

24

C

C

VAC

24

VAC

24

120

VAC

120
VAC

Typical hookup of powered dehumidifier
(whole house dehumidifer)

U3

1

U3

U2

U2

U1

POWERED

DEHUMIDIFIER

U1

RH

RC

R

24

C

C

VAC

24

VAC

24

VAC

120
VAC

120

Typical hookup of variable speed blower
for dehumidification in low speed

U3

1

U3
U2

U2

NON-POWERED

U1

HUMIDFIER

U1

RH

RC

R

VAC

24

VAC

C

120
VAC

FIELD INSTALLED
JUMPER BETWEEN
R AND U1

Typical hookup of non-powered
ventilation

U3

1

U3
U2

U2

NON-POWERED

U1

VENTILATOR

VAC

OR

24 VAC

U1

RH

RC

R

C

24

VAC

U3

1

U3
U2

U2

U1

WITH LOW SPEED FAN

U1

RH

RC

R

C

DEHUMIDIFICATION

120
VAC

24

VAC

FIELD INSTALLED
JUMPER BETWEEN
R AND U1

2

FIELD INSTALLED
JUMPER BETWEEN
R AND U1

120
VAC

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

Wire the universal 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

5

2

Installing the thermostat

2.1 Separate wallplate
from thermostat.

2.2 Mount wallplate as shown.

Mount new wallplate
using screws and
anchors included with the
thermostat.

Drill 3/16-in holes for
drywall.

Drill 7/32-in holes for
plaster.

2.3 Connect power to
thermostat.

2.3a Connect thermostat to

the R and C terminals at
the EIM or to a separate
24 volt transformer (not
provided).

2.3b Push excess wire back

into the wall opening.

Thermostat (back view)

1324

R

C

Wallplate

Wallplate (back view)

Wallplate

2.4 Insert coin cell battery.

Place coin cell battery in
thermostat as shown with +
side up.

NOTE: Coin cell battery

saves time and date during a
power loss.

6

Coin cell
battery

1324

Thermostat (back view)

M36568

2.5 Mount thermostat on
wallplate.

Align thermostat to wallplate
and snap into place.

Powering optional RedLINK accessories

3

3.1 Install batteries in RedLINK
accessories.

• Portable Comfort Control

• Wireless Outdoor Sensor*

• Wireless Indoor Sensor*

• Wireless Entry/Exit Remote*

• Wireless Vent and Filter Boost
Remote*

* Requires setup. See Installer
Setup options in Step 4.5.

3.2 Connect gateway to internet
and connect to power.

3.2a Connect RedLINK Internet

Gateway to router or
modem with Ethernet
cable (RJ45).

3.2b Connect gateway’s power

cord to an electrical outlet
that is not controlled by a
wall switch.

Thermostat

LINK

RED

POWER

INTERNET

Wallplate

R

C

3.2a

3.2b

7

CONNECT

CONNECTED

Performing initial setup

4

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

• Residential or commercial

• Non-zoned or zoned

• Used with or without an Equipment Interface Module (THM5421)

• Used with or without the TrueZONE Wireless Adapter (THM4 000)

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
accessories. Then go to step 4.5.

4.2 Link the thermostat to the
equipment interface module.

4.2a Press and quickly release the

CONNECT button on the EIM.
Make sure the “Connected” light
is flashing green.

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.

• Green Flashing: In Listening
Mode - system is ready to add
RedLINK devices.

• Green Steady: RedLINK devices are
communicating.

• Red: RedLINK device(s) are NOT
communicating. Check EIM and
RedLINK devices.

Next

Next

4.2b While the “Connected” light is
flashing green on the EIM, press

Next on the thermostat. After

a short delay, the screen will
display Device Connected.

8

Next

4.3 When you see the prompt Do you
have RedLINK accessories to
connect? Touch Yes or No.

• If you select Ye s, you will be
prompted to Press Connect on all
new accessories. Continue to Step

4.4.

• If you select No, continue to Step 4.5.

4.4 Connect each RedLINK accessory.

NOTE: Make sure accessories are at

least 2 feet away from the EIM during
the linking process.

4.4a While the Add Device screen
is displayed (listening mode),

press and quickly release the

CONNECT button on each new
RedLINK accessory.

4.4b After a short delay (up to 20
seconds), check the thermostat
to confirm the connection of
each RedLINK accessory.

4.4c Touch Done at the thermostat
after all new RedLINK
accessories are connected.

NOTE: The thermostat displays a

countdown timer while in listening
mode. If it detects no activity for 15
minutes, it exits listening mode.

Listening mode

Done

Listening mode

4.5 Finish the initial setup.
Finish the setup by selecting the
desired options. Touch Done after you
select the last option you want to
change.

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

complete.

9

5

Finding your password (Date Code)

• To add or remove RedLINK accessories

• To make changes to Installer Setup

• To perform Installer Test

• To view Data Logs

Thermostat (back view)

Finding your password

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

1 Touch Menu.

2 Select Dealer Information.

1624

Password
(Date Code)

1624

Dealer Informaon

10

1624

OK

Linking RedLINK accessories to the thermostat

1 Touch Menu.

2 Select Installer Options.

3 Enter password (date code) and

touch Done.

4 Select Wireless Device Manager.

Installer Opons

Done

Wireless Device Manager

5 Select Add Device to display the Add

Device screen. The thermostat is
now in listening mode.

NOTE: Accessories must be at

least 2 feet away from the EIM
during the linking process.

5a Press and quickly release the

CONNECT button on each new
RedLINK accessory.

5b After a short delay (up to 20

seconds), check thermostat to
confirm the connection of each

RedLINK accessory.

5c Touch Done at the thermostat

after all new RedLINK
accessories are connected.

NOTE: Thermostat displays a

countdown timer while in listening
mode. If it detects no activity for
15 minutes, it exits listening mode.

11

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.

1 Touch Menu.

2 Select Installer Options.

Installer Opons

3 Enter password (date code)

and touch Done.

4 Select Create Setup or Installer Test.

Done

5 Follow prompts on the screen to

select the desired setup options
or to perform an equipment test.

Mounting outdoor and indoor sensors

Mounting an outdoor sensor

1 Mount the sensor on a vertical

exterior wall, at least 6 inches below
any overhang. Choose a location
protected from direct sunlight.

2 Place sensor securely in bracket,

facing away from wall.

12

Mounting an indoor sensor

1 Remove the wallplate and mount

it 4 to 6 feet above the floor on an
interior wall. Drill 3/16-inch holes
for drywall, 7/32-inch for plaster.

2 Attach sensor securely to wallplate

as shown.

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.

13

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

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.

• Visit http://thermostatsetup.honeywell.com to enter your dealer
information and contractor logo or load new thermostat software.

• After setup is complete, save Installer Setup, Holiday Schedules, and
Custom Reminders to a USB device.

To use the USB device in the thermostat:

1 Slide USB device into the bottom of

thermostat.

2 Select the item to load or save.

3 Follow the prompts on the screen for the

item you selected.

• To add information from the USB
device to the thermostat, select

Load into Thermostat.

• To put thermostat information on
the USB device, select Save to USB.

Load Installer Setup

into Thermostat

To replace a thermostat

When you replace a thermostat, you must reset the RedLINK 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 4
seconds). Press REMOVE, then YES to disconnect the old ther­mostats. To reconnect the thermostat, go to Step 4.3.

At the Indoor Sensor, RedLINK 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.

At the Equipment Interface Module (EIM):

Press and hold the CONNECT button on the EIM until the CON
NECTED 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.

14

Portable Comfort

Control

Press and hold

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 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 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 Internet Gateway: 37/8 x 39/16 x 11/8 (99 x 91 x 29 mm)

RedLINK Communication

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

Electrical ratings

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

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

Wireless Outdoor Sensor 10k ohm NTC C7089U1006

Wired Wall-mount Indoor Sensor 10k ohm NTC C7189U1005

Wired Flush-mount Indoor Sensor 20k ohm NTC C7772A1004, C7772A1012

Wired Wall-mount Indoor Sensor 20k ohm NTC TR21

Wired Wall-mount Indoor Sensor 10k ohm NTC TR21A

Supply or Return Air Sensor 10k ohm NTC C7735A1000

Supply or Return Air Sensor 20k ohm NTC C7041

Supply or Return Air Sensor 20k ohm NTC C7770A1006

Occupancy Sensor for Remote Setback WSK24

Cover Plate (covers marks left by old thermostats) THP2400A1027W, THP2400A1027G,

15

Terminal Voltage (50/60 Hz) Max. Current Rating

Accessories / Replacement Parts Part Number

THP2400A1027B

69-2739-05

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

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 the Thermostat
Recycling Corporation at www.thermostat-recycle.org or 8002388192 for
information on how and where to properly and safely dispose of your old thermostat.

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.honeywell.com,

or call toll-free:

18004681502 (residential installation)
18882451051 (commecial installation)

Home and Building Technologies

In the U.S.:

Honeywell

1985 Douglas Drive North

Golden Valley, MN 55422

http://customer.honeywell.com

® U.S . Registered Tradem ark.
© 2016 Ho ney well I nternation al Inc .
69-27 39 —0 5 M. S. Rev. 12-16
Print ed in U. S.A.

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