Honeywell YTHX9421 User Manual

System
Installation
Guide

2-wire Prestige® IAQ and RF EIM

With wireless accessories

Control for up to 4 Heat/2 Cool heat pump systems or up to
3 Heat/2 Cool conventional systems.

Installation guide for:

• THX9000 Prestige IAQ thermostat

• Equipment Interface Module

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

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.

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

Need Help?

For assistance with this product please visit http://customer.honeywell.com

or call Honeywell Customer Care toll-free at 1-800-468-1502

® U.S. Registered Trademark.
Copyright © 2011 Honeywell International Inc.
All rights reserved.

• Portable Comfort Control

• Wireless Outdoor Air Sensor

69-2445EFS-03

2-wire Prestige® IAQ and RF EIM

Mount and wire thermostat

1

Pull wiring through hole in wall plate and install as shown below.
Strip 1/4" insulation and connect wires to screw terminals as shown.

Wall anchor

Drywall: 3/16" hole
Plaster: 7/32" hole

Mounting

screw

MCR29241

MCR32386

MCR32387

Connect the two wires from the thermostat to the Equipment Interface
Module R and C terminals or to a separate 24 volt transformer (not pro­vided).

Wiring must comply with local electrical codes.

Mount and wire Equipment Interface Module

2

Use screws & anchors (not included) as appropriate for mounting surface.
Mount Equipment Interface Module on wall near HVAC equipment, or on
the equipment itself.

Do not install inside HVAC equipment.

Strip 1/4” insulation, then insert wires as shown.

R
C

W

O/B

W2

AUX1

W3

AUX2

Y
Y2
G
L

69-2445EFS—03

MCR32389

MCR32388

2

2-wire Prestige® IAQ and RF EIM

Wiring guide

Typical hookup of conventional system with up to three-stage heat and two-stage cool with single
transformer.

FURNACE

TO THERMOSTAT

TRANSFORMER

R

24

C

VAC

120

VAC

STATUS

LEDS

POWER

HEAT

COOL

FAN

U1
U2
U3

SENSORS

CONV

W
W2
W3

G

Y

Y2

1

3

RETURN AIR SENSOR

2

DISHARGE AIR SENSOR

INDOOR SENSOR

OUTDOOR SENSOR

RETURN AIR SENSOR

DISHARGE AIR SENSOR

INDOOR SENSOR

2

OUTDOOR SENSOR

STAGE 1 HEAT

STAGE 2 HEAT

STAGE 3 HEAT

FAN

COMPRESSOR

(STAGE 1)

COMPRESSOR

(STAGE 2)

JUMPERS

1

SEE WIRING GUIDE—EQUIPMENT SECTION FOR IAQ EQUIPMENT WIRING.

WIRE A MAXIMUM OF TWO SENSORS USING THE S1, S1, S2, S2

2

TERMINALS.

REMOVE JUMPER(S) FOR SEPARATE TRANSFORMERS.

3

3

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M32390

2-wire Prestige® IAQ and RF EIM

Wiring guide

Typical hookup of heat pump system with up to four-stage heat and two-stage cool with single
transformer.

TO THERMOSTAT

O/B

AUX1
AUX2

Y

Y2

G

L

CHANGEOVER VALVE

BACKUP HEAT

STAGE 1

BACKUP HEAT

STAGE 2

COMPRESSOR

(STAGE 1)

COMPRESSOR

(STAGE 2)

FAN RELAY

COMPRESSOR

MONITOR OR

ZONE PANEL

STATUS

LEDS

POWER

HEAT

COOL

FAN

U1
U2
U3

HEAT PUMP

O/B
AUX1
AUX2

3

1

69-2445EFS—03

JUMPERS

AIR HANDLER

TRANSFORMER

R

24

C

VAC

RETURN AIR SENSOR

2

DISHARGE AIR SENSOR

SENSORS

1

SEE WIRING GUIDE—EQUIPMENT SECTION FOR IAQ EQUIPMENT WIRING.

WIRE AT MAXIMUM OF TWO SENSORS USING THE S1, S1, S2, S2

2

TERMINALS.

L TERMINAL SENDS CONTINUOUS OUTPUT WHEN THERMOSTAT IS SET TO

3

EM. HEAT MODE.

OUTDOOR SENSOR

RETURN AIR SENSOR

DISHARGE AIR SENSOR

2

OUTDOOR SENSOR

120

VAC

INDOOR SENSOR

INDOOR SENSOR

4

M32391

2-wire Prestige® IAQ and RF EIM

VA

24

VA

Wiring guide—equipment

Any combination of Universal relays (U1, U2, U3) can be used.

With power supply Without power supply

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

U3

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

U3
U2

U2
U1

POWERED

VENTILATOR

U1

RH
RC
R

24

C

C

VAC

24

VAC

24

VAC

120

120
VAC

Typical hookup of powered dehumidifier
(whole house dehumidifier).

U3

U3
U2

U2

24

VAC

U1

U1

RH
RC
R
C

POWERED

DEHUMIDIFIER

VAC

24

VAC

24

120

VAC

VAC

120

M32393

M32396

M32398

U3

U3
U2

U2

NON-POWERED

U1

HUMIDIFIER

VAC

U1

RH
RC
R
C

24

VAC

120

VAC

FIELD INSTALLED
JUMPER BETWEEN
R AND U1

M32394

Typical hookup of non-powered ventilation.

U3

U3
U2

U2

NON-POWERED

U1

VENTILATOR

24 VAC

U1

RH
RC
R

24

VAC

C

120
VAC

FIELD INSTALLED
JUMPER BETWEEN
R AND U1

M32397

Typical hookup of variable speed blower for
dehumidification in low speed.

U3

1

U3

OR

24 VAC

U2

U2
U1

U1

RH
RC
R
C

2

DEHUMIDIFICATION

WITH LOW SPEED FAN

120

24

VAC

VAC

FIELD INSTALLED
JUMPER BETWEEN
R AND U1

M32392

ANY COMBINATION OF UNIVERSAL RELAYS (U1, U2, U3) CAN BE USED. THEY ARE SET IN THE THERMOSTAT

1

INSTALLER SETUP.

WIRE THE EIM’S UNIVERSAL RELAY TO THE LOW SPEED FAN FOR DEHUMIDIFICATION CONTROL AT THE

2

EQUIPMENT. THE EIM’S RELAY CAN BE SET TO NORMALLY OPEN OR NORMALLY CLOSED IN THE
THERMOSTAT INSTALLER SEUP.

= NORMALLY OPEN, DRY CONTACTS

= NORMALLY CLOSED, DRY CONTACTS

KEY

5

M32409

69-2445EFS—03

2-wire Prestige® IAQ and RF EIM

CONNECT

Link all devices to wireless network

3

The following instructions detail the connection process of the Prestige
IAQ thermostat, Equipment Interface Module (EIM), and wireless
RedLINK™ accessories.

NOTE: If the system is zoned using a TrueZONE™ panel with
RedLINK™, the thermostat and accessories are connected to the Wireless
Adapter. For more information, follow the connection process in the
TrueZONE™ instructions.

Connection of Prestige IAQ Thermostat to the Equipment Interface
Module

1. Connect 24 V power to the
Prestige IAQ and EIM.

2. Select language and press NEXT.

Next

MCR32400

3. If zoned, select zone number and
press NEXT; If not zoned, select
Not Zoned and press NEXT.

CONNECTED

CONNECT

69-2445EFS—03

Next

MCR32401

4. Name thermostat and press NEXT.

Next

MCR32402

LED

S2

CONNECT

S2
S1

BUTTON

S1

5. Press and release the CONNECT
button at the Equipment Interface
Module (EIM). The CONNECT LED
on EIM will flash green.

M32399

6

2-wire Prestige® IAQ and RF EIM

6. Press NEXT to connect the
Prestige IAQ thermostat to the
Equipment Interface Module
(EIM).

Next

MCR32403

7. Press Done. Thermostat will
advance to the Home Screen.

Done

MCR32404

Install batteries in wireless accessories

If no wireless accessories are being connected, skip to step 13.

Outdoor air sensor
(optional; steps 8–9)

Install 2 fresh AA
lithium batteries

M28800

Portable Comfort Control
(optional; steps 10–12)

Install 3 fresh AA
batteries

M29863

Connect Wireless Accessories: Outdoor Sensor and Portable Comfort
Control

8. Press and release the CONNECT
button on the Wireless Outdoor
Sensor.

9. Check thermostat to verify that
the outdoor sensor is working.
After about 15 seconds, the
thermostat should display outdoor
temperature and humidity.

MCR28847A

7

69-2445EFS—03

2-wire Prestige® IAQ and RF EIM

M28846

CONNECT

CONNECT

CONNECT

WIRELESS SETUP

10. Press the CONNECT button on
the Portable Comfort Control.

11. When the screen displays
"Connected," press DONE.

Press to link to
another thermostat

Press to save
and exit

NOYES

CONNECT MORE?

CONNECTED

CONNECT

Install outdoor sensor

4

S2
S2
S1
S1

M28481

M28482

LED

BUTTON

M32399

12. Press NO at the next screen
to save and exit. (Or press
YES and repeat steps 3-5 to
link another thermostat.)

The linking procedure at the Portable
Comfort Control may time out if there is no
keypress within 30 minutes. To begin again,
press and hold the blank space (or arrow,
if present) in the lower right corner of the
screen until the display changes (about 3
seconds).

13. Press and release the
CONNECT button at the EIM
to exit (CONNECT LED on
Equipment Interface Module
[EIM] will be steady green).
NOTE: The connection will
time out automatically in 15
minutes.

69-2445EFS—03

M28491

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.

M28849A

8

Customize thermostat (installer options)

MCR28998

5

2-wire Prestige® IAQ and RF EIM

Installer Options

MENU

HELP

HELP

Note: Press HELP for
more information on
these and other options.

MENU

MCR29794

MCR28799

Press MENU.

Press t to scroll down, then press
INSTALLER OPTIONS. Enter security code
when prompted.

Security code is the thermostat date
code (printed on back of thermostat).
Or press MENU > EQUIPMENT STATUS to
find code.

Press CREATE SETUP to set all system
settings one by one.

Press VIEW/EDIT to select a specific
function and make quick changes.
(See complete list of system settings
on pages 10-11.)

Press INSTALLER TEST to run system
tests. You should always test the sys­tem after making changes to settings.

9

69-2445EFS—03

2-wire Prestige® IAQ and RF EIM

Installer setup tables

Setup functions (factory default setting listed, other options available)

100 Language English
110 Zone Number Not Zoned
112 Device name Thermostat
130 Date Month, Date, Year
160 Schedule options Programmable
172 System selection Conventional
173 Heat Pump Type Air To Air
174 Stages 1 Heat/1 Cool
175 Series 20 Control No
180 Fan operation System (gas/oil/heat)
190 Reversing valve O/B on Cool
200 Backup heat Electric
210 External fossil fuel Yes
220 Compressor cycle rate(s) 3
240 Heat stage cycle rate(s) 5
300 Changeover Manual
310 Deadband 2° F
320 Temperature display Fahrenheit
330 Daylight savings time Auto change: On
1350 Configurable S1 Sensor Input None
1355 Configurable S2 Sensor Input None
342 Outdoor temperature sensor? No
346 Upstage timer Off
347 Droop Temperature 2
349 Backup Heat Control Comfort
350 Compressor lockout (balance point) Off
360 Auxiliary lockout Off
365 Discharge Air Temperature Sensor No
1400 Configurable U1 Relay None
1405 Configurable U2 Relay None
1410 Configurable U3 Relay None
371 Humidification equipment None
372 Indoor humidity control Off
374 Humidifier fan action Humidify only with fan
379 Dehumidification equipment None
1500 Low Speed Fan Position Normally Closed
383 Overcooling limit 3° F (1.5° C)
384 Dehumidification fan control Forces fan on
386 Whole house Dehumidification Lockout Off
390 Dehumidification away mode Off
391 Away mode fan operation Automatic
392 Away mode low temp. setting 76° F (24.5° C)
393 Away mode high temp. setting 85° F (29.5° C)
394 Away mode dehumidification 65% relative humidity
400 Ventilation Control Off
401 Number of Bedrooms/Size of home 2 (1000 sq. ft.)
403 Ventilation levels 160 cfm (50%)
405 Ventilation Fan Action Ventilation Forces Fan On
406 Ventilation in High Humidity On

69-2445EFS—03

10

2-wire Prestige® IAQ and RF EIM

Installer setup tables

Setup functions (factory default setting listed, other options available)

431 Ventilation Lockout Temperatures None
433 Ventilation Lockout High Outdoor Humidity Off; 75° dewpoint if On
450 A-Coil Low Temperature Cutoff None
500 Replacement reminders Off
502 Furnace filter runtime counter Count heat and cool
525 Installer Custom Reminders Add Customer Reminder
530 Adaptive Intelligent Recovery On
540 Number of schedule periods 4
580 Minimum compressor off time 5 minutes
600 Temperature range stops 90° F (32° C); 60° F (15.5° C)
640 Clock format 12-hour
650 Extended fan on time(s) Off
670 Keypad lock Unlocked
680 Temp. control (heat) Standard
690 Temp. control (cool) Standard
695 Finish on High Heat Stage No
696 Finish on High Cool Stage No
700 Indoor display offsets No offset

Customer contact information (optional, but recommended)

1100 Dealer name Your company name
1150 Dealer phone number Your telephone contact
1200 Dealer email address Your email address
1250 Dealer website Your web site
1300 Dealer Message Edit

Note: All installer options, including Dealer name, contact information and message can
be set up as a file and downloaded via the USB port on the thermostat.

Restore Factory Defaults

Under the Menu, Installer Options and Advanced Options is a button to
“restore factory defaults.”

If pressed, it will reset the program schedule and most installer setup
options (exceptions: 1350, 1355, 1400, 1405, 1410, 1500 and 450) and
disconnect the thermostat from the Equipment Interface Module.

11

69-2445EFS—03

2-wire Prestige® IAQ and RF EIM

Accessories

Wireless Outdoor Sensor – Displays outdoor temperature and outdoor
humidity on other RedLINK devices. Use for temperature lockouts in heat
pump applications, condensation protection with humidification control and
temperature and/or dewpoint lockouts for ventilation control.

Portable Comfort Control – Senses temperature; use to change thermo­stat settings.

Discharge Air Temperature Sensor – Use for desert humidification con­trol to help prevent condensation in duct system. Also used to control
coil freeze protection: it will cut off condenser and keep the blower fan
running to prevent freezing the coil. If used with a Return Air Temperature
Sensor the Delta T can be viewed in thermostat’s installer test.

Return Air Temperature Sensor – Use for backup control. If power
is lost at thermostat, the Equipment Interface Module sets temperature
to 62° F (16.7° C) in Heat and 82° F (27.8° C) in Cool until power is
restored to the thermostat. If used with a Discharge Air Temperature
Sensor the Delta T can be viewed in thermostat’s installer test.

Wired Indoor Temperature Sensor – Use to sense and control tempera­ture at remote location(s); can be averaged between the thermostat and
sensor location(s). See sensor instructions for installation details.

Wired Outdoor Temperature Sensor – Sends outdoor temperature for
display on thermostat. Use for temperature lockouts in heat pump appli­cations, condensation protection with humidification control and tempera­ture lockouts for ventilation systems.

69-2445EFS—03

12

2-wire Prestige® IAQ and RF EIM

Replacing system components

Equipment Interface Module

After installing a new Equipment Interface Module, you must re-link all
devices to the new EIM, as described below:

1. Install and wire new Equipment Interface Module.

2. Disconnect thermostat from the old Equipment Interface Module.

Installer Options

Wireless Device

MENU

HELP

Manager

Remove Device

MENU

MCR28801

MCR28998

MCR28802

Press MENU.

Press t to scroll down, then press
INSTALLER OPTIONS. Enter security code
when prompted.

Security code is the thermostat date
code (printed on back of wallplate). Or
press MENU > EQUIPMENT STATUS to find
code.

Press t to scroll down, then press
WIRELESS DEVICE MANAGER.

Press REMOVE DEVICE.

Remove This

Thermostat

MCR32405

MCR32406

Press REMOVE THIS THERMOSTAT.

13

69-2445EFS—03

2-wire Prestige® IAQ and RF EIM

CONNECT

Replacing system components

Equipment Interface Module (Continued)

Press YES.

Yes

MCR32407

M32408

3. Link thermostat to the new Equipment Interface Module (see pages
6–7)

Thermostat

After installing a new thermostat, you must link the new thermostat to the
Equipment Interface Module, as described below.

1. Install and wire new thermostat (see pages 3-7).

2. Link thermostat to Equipment Interface Module (see pages 6–7).

Portable Comfort Control

1. Press and hold the blank space (or arrow if present) in the lower
right corner of the screen until the display changes (see page 8).

2. Press REMOVE, then yes to disconnect from old Equipment Interface
Module.

3. Follow the procedure on pages 7–8 to link to new Equipment
Interface Module.

Outdoor air sensor

1. Press the connect button to link to the new Equipment Interface
Module (see page 7).

How to disconnect all devices from the wireless network
at the same time

Press and hold the Connect button at the
Equipment Interface Module until the LED flashes
amber (about 10 seconds).

NOTE: To get the Portable Comfort Control back
to the connect screen, follow the instructions

M32399

below.

CONNECTED

CONNECT

LED

S2

CONNECT

S2
S1

BUTTON

S1

M28846

69-2445EFS—03

Portable Comfort Control

Press and hold the blank space (or arrow, if
present) in the lower right corner of the screen
until the display changes (about 3 seconds).

14

2-wire Prestige® IAQ and RF EIM

Specifications & 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 Air Sensor: -40 to 140° F (-40 to 60° 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)

Operating Relative Humidity

Thermostat: 5% to 90% (non-condensing)
Portable Comfort Control: 5% to 90% (non-condensing)
Wireless Outdoor Air Sensor: 0% to 100% (condensing)
Equipment Interface Module: 5% to 95% (non-condensing)

Physical Dimensions (height, width, depth)

Thermostat: 3-9/16 x 5-13/16 x 1-1/2 inches (91 x 147 x 38 mm)
Wireless Outdoor Air Sensor: 5 x 3-1/2 x 1-11/16 inches (127 x 89 x 43 mm)
Equipment Interface Module: 9-5/16 x 4-13/16 x 1-19/32 inches (91 x 147 x 38 mm)

Electrical Ratings

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

W - O/B 18 to 30 VAC 1.00A
Y (cooling) 18 to 30 VAC 1.00A
G (fan) 18 to 30 VAC 0.60A
W2 - Aux 1 (heating) 18 to 30 VAC 0.60A
Y2 (cooling) 18 to 30 VAC 0.60A
W3 - Aux 2 18 to 30 VAC 1.00A
L (Output) 18 to 30 VAC 0.60A
U1 30 VAC max. 0.50A
U1 30 VAC max. 0.50A
U2 30 VAC max. 0.50A
U2 30 VAC max. 0.50A
U3 30 VAC max. 0.50A
U3 30 VAC max. 0.50A
S1 30 VAC max. 0.50A
S1 30 VAC max. 0.50A
S2 30 VAC max. 0.50A
S2 30 VAC max. 0.50A

Accessories & Replacement Parts

Item Part Number

Portable Comfort Control REM5000R1001
Wireless Outdoor Air Sensor C7089R1013
Cover Plate (covers marks left by old thermostats) 50028399-001
Wired Indoor Sensor C7089U1005
Discharge Air Sensor C7735A1000
Return Air Sensor C7735A1000
Wired Outdoor Temperature Sensor C7089U1006

15

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