Johnson Controls NXT-INT-01 Bedienungsanleitung

INSTALLATION GUIDE

Installing and Operating the NXT-INT-01 Intelligent Thermostat

Introduction

The Intelligent Thermostat has a space

temperature sensor, five user push buttons,

and a 2 line x 8 character dot matrix LCD

to show room temperature, time, outside air

temperature, setpoint, and other optional

parameters (depending upon the operation).

NXT-INT-01 Intelligent Thermostat

OVERRIDE

ROOM/

OUTSIDE

72 ° F

RoomTemp

Figure 2 - Wiring connection for the Intelligent Thermostat

www.johnsoncontrols.com

LIT-TD-2006 11/2002

Literature Part # 24-9869-5 Rev. A

Figure 1 - NXT-INT-01 Intelligent Thermostat

Installation

The thermostat connects to the controllers

via a 2-wire (#22 AWG, single twisted pair)

cable. The NexSys thermostat communica-

tions bus carries power and communica-

tions for the Intelligent thermostat.

Wiring

WARNING - TO PREVENT ELECTRI-

CAL SHOCK OR DAMAGE TO THE

EQUIPMENT, YOU MUST DISCON-

NECT THE POWER SUPPLY TO THE

ELECTRONICCONTROLLER

BEFORE YOU MAKE THE WIRING

CONNECTIONS.

All wiring is low voltage and should be in

accordance with local regulations and the

National Electrical Code.

Use shielded cable only when it is required.

Most applications do not require shielding

and will benefit from unshielded cable.

When using the optional shielded cable,

ground only one end of the shield. Low

voltage control wiring should not be run in

the same conduit as line voltage wiring or

other conductors that supply highly-

inductive loads (such as contactors, coils,

motors, generators, etc.).

CAUTION - MAKE ALL CONNEC-

TIONS AND CHECK ALL CONNEC-

TIONS BEFORE APPLYING

POWER. IMPROPER WIRING MAY

CAUSE PERMANENT DAMAGE TO

THIS EQUIPMENT.

Wiring Recommendations

Unshielded

Stranded, 22AWG: Belden #8442(2-

wire), Belden #8444(4-wire)

Plenum-rated, Stranded, 22AWG: Belden

#82442(2-wire), 82444(4-wire)

Stranded, 18AWG: Belden #8461(2-

wire), Belden #8489(4-wire)

Plenum-rated, Stranded, 18AWG: Belden

#87740(2-wire), 82489(4-wire)

Shielded

Stranded: Belden #8761

Solid: Belden #8450

Plenum-rated, Stranded: Belden

#88761other equipment.

To Wire the Intelligent Thermotat:

1. Connect the Red wire of the stat’s pigtail

to the STAT + terminal of the controller.

2. Connect the Black wire of the stat’s

pigtail to the controller’s STAT - terminal.

Refer to Figure 2 below.

Mounting

Mount the thermostat where it is exposed

to normal air circulation and where it senses

the average temperature of the space being

controlled (normally about 5 feet above the

floor). Do not mount it where it could be

affected by heat or cold from windows,

pipes, doors, lamps, sunlight, outside walls,

or other sources. See Figure 3 for dimen-

sions.

Figure 3 - Intelligent Thermostat dimensions

ST- ST+ NET- NET+

RED

BLACK

Electronic Systems USA, Inc.

OVERRIDE

ROOM/

OUTSIDE

72 ° F

RoomTemp

Room Sensor Installation - Page 2

Installation and Operation - Page

Repairs and Replacement

Do not make field repairs. Please

contact Johnson Controls at (800) 765-

7773 for replacement and other services.

Johnson Controls, Inc. reserves the

right to update specifications when

appropriate. Information contained in

this document is based on specifica-

tions believed to be correct at the

time of publication.

Figure 4 - Mounting the Intelligent Thermostat

LIT-TD-2006 11/2002

Literature Part # 24-9869-5 Rev. A

To mount the thermostat:

1. Install a 2” x 3” outlet box and the wiring

from the NexSys controller.

2. Pull the wiring from the outlet box and

insert it through the mounting bracket.

3. Assemble the mounting bracket to the

outlet box.

4. Connect the 2-wire pigtail from the

thermostat to the wires in the wall and

secure them with wire nuts. Obey wiring

polarity (see Figure 2).

5. Push excess wire into the outlet box.

6. Snap the cover onto the mounting

bracket.

Operation

Startup

Once activated, the Intelligent Thermostat

will display “ESUSA” then “Init. . .”

(initializing) on the LCD display window.

After five seconds, the thermostat will

send the current temperature and request

the Home Page parameter to update its

display.

If the thermostat detects a communica-

tions failure, “Com Fail” will display in the

display window for five seconds. “Retry”

will display when the thermostat attempts

to communicate again. Should the

thermostat detect a hardware or EEPROM

error, “Error” displays in the window.

Modes

The Intelligent Thermostat has three

operating modes: User, Configuration, and

Balance.

User Mode - In User Mode, the thermo-

stat samples the space temperature and

allows the occupant to adjust the setpoint,

display parameters, and activate the

Override function.

Configuration Mode - A technician

accesses this mode by entering a password

value using the buttons on the thermostat.

In this mode, the thermostat becomes a

basic configuration tool that allows a

technician to view and/or edit the

controller’s configuration and all its

operating parameters.

Balance Mode - A technician accesses

this mode by entering a password value

using the buttons on the thermostat. This

mode allows a technician to adjust the

mechanical attributes of the entire VAV

system in order to bring the system into

proper operation.

This thermostat also provides an access

point to connect a PDA or laptop to the

thermostat communications bus. These

devices can then be used to command the

thermostat to Standby mode for one

minute periods.

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