Pentax THX9421R, YTHX9421R Installation Guide

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

* 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.

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

2

Thermostat (back view)

1324

Password
(Date Code)

1324

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 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

Common wire from 24 VAC

C

transformer.

Power wire from 24 VAC

R*

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

ONE DRY CONTACT DEVICE

Conventional System Heat Pump

Terminal Description Terminal Description

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***

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.

A

Connect to THM4000R1000

B

Wireless Adapter for extended

C

wireless range.

D

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

A

Connect to THM4000R1000

B

Wireless Adapter for extended

C

wireless range.

D

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.

Connect a dry contact device such as a
water sensor to S1, S2, S3 or S4 terminals.

MULTIPLE DRY CONTACT DEVICES

ON ONE SET OF 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.

2

Youmustinstallaeldjumperif

the stage of heating or cooling is
powered by the system trans-

former.DoNOTinstallaeld

jumper if the stage of heating has
its own transformer.

4

1

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

TRANSFORMER

24

VAC

120
VAC

VA

VA

VA

24

Wiring humidification, dehumidification and ventilation

Typicalhookupofpoweredhumidier Typical hookup of non-powered

humidier

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dehumidier
(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

U3

1

U3
U2

U2

NON-POWERED

U1

HUMIDFIER

24 VAC

U1

RH

RC

R

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

U1

RH

RC

R

VAC

24

VAC

C

120
VAC

FIELD INSTALLED
JUMPER BETWEEN
R AND U1

Typical hookup of variable speed blower

fordehumidication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

1

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

2

WiretheuniversalEIMrelaytothelowspeedfanfordehumidication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