Johnson Controls NXA-FCU-01 Installation guide

NXA-FCU-01NXA-FCU-01

NXA-FCU-01

FAN COIL UNIT CONTROLLER

Installation Guide

Part # 24-9884-26 Rev A

The documentation contained in this publication is the exclusive property of

Johnson Controls, Inc., and its use is restricted to the licensed software with

which it is furnished. This publication may not be used for any other purpose

without the express written consent of Johnson Controls, Inc. Johnson

Controls, Inc., reserves the right to update specifications when appropriate.

Information contained in this document is based on specifications believed to

be correct at the time of publication.

Echelon

©

, Coactive

©,

Windows NT

©

, and General Electric

©

are registered

trademarks and service marks of companies other than Johnson Controls, Inc.

FSC™, CPL™ and NexSys™ are trademarks of Johnson Controls, Inc.

www.johnsoncontrols.com

Revised 12/2002

Published in U.S.A.

FCC WARNING

The Federal Communications Commission (FCC) requirements prescribe

certification of personal computers and any interconnected peripherals in the

FCC rules and regulations.

This device complies with Part 15 of the FCC rules. Operation is subject to

the following two conditions: This device may not cause harmful interference,

and this device must accept any interference received, including interference

that may cause undesired operation.

This equipment generates and uses radio frequency (RF) energy for its

operation and, if not installed and used in accordance with the installation and

operation manual, may cause interference to radio and television reception. It

has been found to comply with the limits for a Class A computing device

pursuant to the aforementioned regulations. These are designed to provide

reasonable protection against such interference when operated in a residential

area. Only peripherals (computer input/output devices) certified to comply

with the Class A limits may be connected to this device. Operation with

noncertified computer peripherals is likely to result in interference with radio

and television reception. If this equipment does cause interference to radio or

television reception, the user is encouraged to correct the situation by one or

more of the following measures:

• Relocate the receiver with respect to the computer.

• Move the computer away from the receiver.

• Plug the equipment into a different outlet, so that the computing device

and receiver are on different branch circuits.

• Disconnect and remove any unused cables that may be acting as a transmis

sion source.

• Make certain that the computing device is plugged into a grounded outlet

receptacle.

If necessary, contact Johnson Controls Inc., for additional suggestions.

Installation Guide FCU Controller

4

SYMBOLS

This is the symbol for Electro-Static Discharge. Electro-Static

Discharge (ESD) can damage certain electronic devices. ESD is a

transfer of electrostatic charge between bodies at different

electrostatic potentials caused by direct contact or induced by a electrostatic

field. The threshold for feeling an electro-static discharge is approximately 900

to 1000 volts. The average spark produced by a static discharge from a human

body varies from about 10,000 to 25,000 volts.

ESD can cause damage to integrated circuits (IC). Due to the small size of

these complex devices, the ESD sensitivity has increased so much that some

of these devices can be destroyed or damaged by as little as 20 volts. ESD

damage is easy to induce, hard to detect, and is expensive to repair. Workers

could be subjecting an electronic device to lethal voltages without being aware.

The following is a list of precautions when handling static sensitive devices.

•

A conductive ground strap should be worn to assure that you are at ground

potential. If a ground strap cannot be used, you should ground yourself

before touching the device and remain in contact with a grounded metallic

object during the entire time while working with the device.

•

Containers, tools, test equipment, and fixtures that come into contact with

the device should be properly grounded. Grounding of electrical equip-

ment should be done by a grounded plug, not through the conductive

surface of the grounded workstation.

•

Workers clothing should never make contact with the device and workers

should avoid activities that cause friction in the area of the workstation

(wiping feet, rubbing of hands, etc.).

• Workers should avoid touching leads or contacts.

This is the symbol for caution and represents possible equipment

damage. When this symbol appears, follow the succeeding text to

prevent possible equipment damage.

This is the symbol for danger and represents possible bodily injury or

threat to life and limb. When this symbol appears, follow the

succeeding text closely for safe operation.

FCU Controller Installation Guide

5

Table of Contents

FCU-01 Overview ..................................................................................... 6

Inspection ................................................................................................... 7

Requirements .............................................................................................. 7

Location ...................................................................................................... 7

Mounting .................................................................................................... 8

Wiring Connections .................................................................................. 9

Power Connections ....................................................................................... 9

Network Wiring ............................................................................................ 10

Thermostat Wiring ....................................................................................... 12

Input Wiring .................................................................................................. 13

Input Labeling ....................................................................................... 14

Input Jumper Blocks ............................................................................ 14

Input 1 (I1) - Discharge Air Temperature Wiring ........................... 15

Input 2 (I2) - Mixed Air Temperature Wiring .................................. 16

Input 3 (I3) - Space/Return Air Temperature Wiring ..................... 17

Input 4 (I4) - Outside Air /Supply Water Temperature Wiring .... 18

Input 5 (I5) - Fan Status ...................................................................... 19

Input 6 (I6) - Emergency Shutdown .................................................. 20

Digital Outputs ............................................................................................. 21

Digital Output DO1 - Fan Wiring ..................................................... 22

Digital Outputs DO2 and DO3 - Cooling Inc/Dec or Stage 1/2

Wiring ..................................................................................................... 23

Floating Control .......................................................... 23

Discrete Control ......................................................... 24

Digital Outputs DO4 and DO5 - Heating Inc/Dec or Stage 1/2

Wiring ..................................................................................................... 25

Floating Control .......................................................... 26

Discrete Control ......................................................... 27

Analog Output .............................................................................................. 28

Analog Output AO1 - Damper Actuator Wiring ............................ 29

Warranty ...................................................................................................... 30

Installation Guide FCU Controller

6

FCU-01 OVERVIEW

The NXA-FCU-01 Fan Coil Unit Controller is an Application Specific

Controller (ASC) in the NexSys product line. The FCU-01 controller is a 4” x

6” circuit board using SMT (surface mount technology) components. The

board is snap-track mountable, has 5 triac outputs, 1 analog output, 6 inputs, a

free topology transceiver, a STAT/Configuration port and is powered by 24

VAC. The FCU-01 controller can support stand-alone operation but is best

utilized when used in conjunction with network communications.

GND I5 I4 GND I3 I2

VOUTI1GND

I6

DO5 DO4 HOT DO3 DO2 HOT

AGNDAO1DO1

HOT

GND

HOT

NEU

24 VAC

STATUS

RESET

SERVICE

ST- ST+ NET- NET+

Analog

Output

24VAC

Power

Input

Inputs

Cover

Status

LED

Output

Test

Pushbutton

Service

LED

RESET

Pushbutton

Network

Connection

Thermostat

Connection

}

Service

Pushbutton

}

Digital

Outputs

}

Configuration

Port Plug

Figure 1. FCU-01 Controller.

FCU Controller Installation Guide

7

INSPECTION

Inspect the carton for possible damage. If damaged, notify the appropriate

carrier immediately. Inspect the components for obvious damage. Contact

Johnson Controls, Inc. before returning damaged products.

REQUIREMENTS

• Job wiring diagrams.

• Tools (not provided):

- Appropriate screwdrivers for wiring terminals and mounting screws.

- Digital Volt/Ohm Meter (DVM).

• Training: Installer must be a qualified, experienced technician.

• FCU-01 enclosure for conduit applications (not provided).

• UL

®

listed Class 2 power transformer (not provided) supplying a nominal 24

VAC (20.4 to 30 VAC) with a minimum rating of 5 VA at 50/60 Hz and 5 VA

plus DO load ( 24 VA total max.) at 50/60 Hz.

LOCATION

AVOID LOCATIONS WHERE EXCESSIVE MOISTURE, CORRO-

SIVE FUMES, EXPLOSIVE VAPORS, OR VIBRATIONS ARE

PRESENT.

AVOID ELECTRICAL NOISE INTERFERENCE. DO NOT INSTALL NEAR

LARGE CONTACTORS, ELECTRICAL MACHINERY, OR WELDING

EQUIPMENT.

JCI FCU-01 CONTROLLERS ARE INTENDED FOR INDOOR USE ONLY.

LOCATE WHERE AMBIENT TEMPERATURES DO NOT EXCEED 131°F

(55°C) OR FALL BELOW 32°F (0°C) AND RELATIVE HUMIDITY DOES

NOT EXCEED 95% OR FALL BELOW 5%, NON-CONDENSING.

Installation Guide FCU Controller

8

MOUNTING

The JCI FCU-01 Controller can be mounted in any direction and on any plane.

Mounting dimensions are 4” x 6” overall board size for snap-track mounting.

For applications requiring mounting using standoffs the .150” circuit board

mounting holes are spaced 3.5” x 5.5”. Dimensions shown in Figure 2 below

are in inches and (mm).

When mounting the JCI FCU-01 Controller in the snap-track railing be careful

not to exert too much pressure when inserting the FCU-01 board into the

snap-track.

NOTE: Follow static electricity precautions when installing, servicing,

or operating the system.

4.00"

(102)

3.50"

(89)

.25"

(6)

.25"

(6)

5.50"

(140)

6.00"

(152)

1.315"

(33)

GND 15 14 GND 13 12 VOUT11GND16 DO5 DO4 HOT DO3 DO2 HOT AGNDAO1DO1HOT

GND

HOT

NEU

24 VAC

STATUS

RESET

SERVICE

ST- ST+ NET- NET+

FCU Controller Installation Guide

9

WIRING CONNECTIONS

POWER CONNECTIONS

Use a UL



listed Class 2 power transformer supplying a nominal 24 VAC (+/-

10%). The supply to the transformer must be provided with a breaker or

disconnect.

NOTE: The UL



listed Class 2 power transformer may be used to

power multiple UL



listed Class 2 powered devices provided

that the transformer is properly sized to power all equipment

simultaneously.

WHEN POWERING MULTIPLE UL





LISTED CLASS 2 DEVICES

FROM THE SAME CLASS 2 POWER TRANSFORMER, POLAR-

ITY MUST BE OBSERVED (24VAC HOT CONNECTED TO

24VAC HOT AND 24VAC NEUTRAL CONNECTED TO 24VAC

NEUTRAL).

DO NOT GROUND THE SECONDARY OF THE POWER TRANS-

FORMER. THE TRANSFORMER FRAME MUST BE GROUNDED.

The power connections to the FCU-01 are shown in Figure 3. To connect

power to the FCU-01:

1. Connect the Hot wire of the transformer to the HOT terminal on

the FCU-01 board.

2. Connect the Neutral wire of the transformer to the NEU terminal

on the FCU-01 board.

3. Connect the GND terminal on the FCU-01 board to a properly

grounded metal chassis.

Installation Guide FCU Controller

10

J1

24VAC HOT

CHASSIS GROUND

24VAC NEUTRAL

HOT

NEU

24 VAC

GND

Figure 3. Power Connections.

NETWORK WIRING

NOTE: The following wiring types are recommended for all network

wiring:

1. Belden 85102 or equivalent - 16 AWG plenum rated, unshielded,

stranded.

2. Belden 8471 or equivalent - 16 AWG non-plenum rated,

unshielded, stranded

3. Generic equivalent - Any Level IV 22 AWG twisted pair, typically

solid and unshielded.

Terminations can be made as daisy chain or T-Tap. The Network wiring is

shown in Figure 13. To connect the LON to the FCU-01:

NOTE: Network wiring is polarity independent. Typical wiring is Black -

and Red +.

1. Connect one lead of the twisted pair to NET+ on the FCU-01

board.

FCU Controller Installation Guide

11

2. Connect the other lead of the twisted pair to NET- on the FCU-01

board.

The network connections (Daisy Chain and T-Tap) to the FCU-01 are shown

in Figure 4 below:

NOTE: Doubly-terminated bus topology provides maximum wiring

distance. To achieve this, T-Tap wiring is allowed, but Daisy

chain wiring is preferred (Figure 4). If the T-Tap exceeds the

specified length (6 inches), then free topology wiring rules

apply.

LON To

Next Device

LON From

Previous Device

LON From

Previous Device

LON To

Next Device

Note:

T-Tap length must not

exceed 6 inches.

Daisy chain

wiring example

T-Tap

wiring example

J10

ST- ST+ NET- NET+

J10

ST- ST+ NET- NET+

Figure 4. Network Wiring to FCU-01.

Installation Guide FCU Controller

12

THERMOSTAT WIRING

DO NOT WIRE ANY THERMOSTAT OTHER THAN THE JCI

THERMOSTATS LISTED BELOW TO THE STAT+ AND STAT-

TERMINALS ON THE FCU-01 BOARD.

••

•

••

•

JCI INTELLIGENT THERMOSTAT NXT-INT-01

•

JCI TSO THERMOSTAT NXT-TSO-01

THE THERMOSTAT CAN ONLY BE CONNECTED TO STAT+

AND STAT-. ANY OTHER CONNECTIONS WILL DAMAGE THE

THERMOSTAT AND VOID THE WARRANTY.

To connect a thermostat to the FCU-01:

1. Connect the black wire to the STAT - terminal.

2. Connect the red wire to the STAT + terminal.

The Intelligent STAT connections to the FCU-01 are shown in Figure 5 below:

NOTE: The Intelligent STAT and TSO STAT are both wired the same.

RED

BLACK

J10

Electronic Systems USA, Inc.

OVERRIDE

*

ROOM/

OUTSIDE

72 ° F

RoomTemp

ST- ST+ NET- NET+

Figure 5. Thermostat Wiring.

FCU Controller Installation Guide

13

INPUT WIRING

Inputs allow a user to connect thermistors and dry contacts to the FCU-01

controller. There are 6 inputs on the FCU-01 controller and the inputs must

be jumpered to allow for thermistors or dry contacts. The Inputs are shown in

Figure 6 below and must be wired as follows:

• UI1

must be wired to Discharge Air Temperature

• UI2

must be wired to Mixed Air Temperature

• UI3

must be wired to Space/Return Air Temperature

• UI4 must be wired to Outside Air/Supply Water Temperature

• UI5

must be wired to Fan Status

• UI6 must be wired to Emergency Shutdown

J2

UI1

Disharge Air

Temp

UI2

Mixed Air

Temp

UI3

Space/Return

Air Temp

UI4

OutsideAir/

Supply

Water Temp

UI5

Fan Status

UI6

Emergency

Shutdwon

J4

J5

J6

J7

J8

J9

GND I5 I4 GND I3 I2 VOUTI1GNDI6

Figure 6. Inputs.

Installation Guide FCU Controller

14

INPUT LABELING

The inputs are labeled I1-I6 and are located on terminal block J2. The

jumpers for the inputs are labeled J4-J9. The following table lists the input

number with its corresponding jumper block number:

Jumper Block # Input #

JP4 I6

JP5 I5

JP6 I4

JP7 I3

JP8 I2

JP9 I1

Jumper Block # Input #

JP4 I6

JP5 I5

JP6 I4

JP7 I3

JP8 I2

JP9 I1

Table 1. Inputs and Corresponding Jumper Block Numbers.

INPUT JUMPER BLOCKS

The inputs are jumper selectable for thermistors or dry contacts, and the

jumper setting is the same for both. Figure 7 is an example of one of the

jumper blocks for the inputs.

JP4

Figure 7. Jumper Block for Input Selection.

FCU Controller Installation Guide

15

INPUT 1 (I1) - DISCHARGE AIR TEMPERATURE WIRING

Input 1 must be wired to the Discharge Air Temperature. Wiring for I1 is

shown in Figure 8. To wire I1 to a thermistor:

1. Select the correct jumper setting for a thermistor on J9.

2. Connect one lead of the thermistor to input terminal I1 on terminal

block J2.

3. Connect the other lead to one of the GND terminals.

NOTE: Only a 10K Type II (CP Curve) thermistor may be used.

J9

J4

J5

J6

J7

J8

J9

J2

THERMISTOR

GND I5 I4 GND I3 I2 VOUTI1GNDI6

Figure 8. I1 - Thermistor Wiring.

Installation Guide FCU Controller

16

INPUT 2 (I2) - MIXED AIR TEMPERATURE WIRING

Input 2 must be wired to the Mixed Air Temperature. Wiring for I2 is shown

in Figure 9. To wire I2 to a thermistor:

1. Select the correct jumper setting for a thermistor on J8.

2. Connect one lead of the thermistor to input terminal I2 on terminal

block J2.

3. Connect the other lead to one of the GND terminals.

NOTE: Only a 10K Type II (CP Curve) thermistor may be used.

J9

J8

J4

J5

J6

J7

J8

J9

J2

THERMISTOR

GND I5 I4 GND I3 I2 VOUTI1GNDI6

Figure 9. I2 - Thermistor Wiring.

FCU Controller Installation Guide

17

INPUT 3 (I3) - SPACE/RETURN AIR TEMPERATURE

WIRING

Input 3 must be wired to the Return Air Temperature if a JCI thermostat

(Intelligent or TSO STAT) is used. If a JCI sensor (Room or Room Override

Sensor) is used, Input 3 must be wired to Space Temperature. Wiring for I3 is

shown in Figure 10. To wire I3 to a thermistor:

1. Select the correct jumper setting for a thermistor on J7.

2. Connect one lead of the thermistor to input terminal I3 on terminal

block J2.

3. Connect the other lead to one of the GND terminals.

NOTE: Only a 10K Type II (CP Curve) thermistor may be used.

J4

J5

J6

J7

J8

J9

J2

THERMISTOR

J9

J7

GN I5 I4 GN I3 I2 VOUI1GNI6

Figure 10. I3 - Thermistor Wiring.

Installation Guide FCU Controller

18

INPUT 4 (I4) - OUTSIDE AIR /SUPPLY WATER TEMPERA-

TURE WIRING

Input 4 must be wired to the Outside Air Temperature or the Supply Water

Temperature. Wiring for I4 is shown in Figure 11. To wire I4 to a thermistor:

1. Select the correct jumper setting for a thermistor on J6.

2. Connect one lead of the thermistor to input terminal I4 on terminal

block J2.

3. Connect the other lead to one of the GND terminals.

NOTE: Only a 10K Type II (CP Curve) thermistor may be used.

J9

J6

J4

J5

J6

J7

J8

J9

J2

THERMISTOR

GND I5 I4 GND I3 I2 VOUTI1GNDI6

Figure 11. I4 - Thermistor Wiring.

FCU Controller Installation Guide

19

INPUT 5 (I5) - FAN STATUS

Input 5 must be wired to the Fan Status. Wiring for the I5 is shown in Figure

12. To wire I5 to a dry contact:

1. Select the correct jumper setting for a dry contact on J5.

2. Connect one lead of the normally open dry contact to input terminal I5

on terminal block J2.

3. Connect the other lead to one of the GND terminals.

J9

J5

J4

J5

J6

J7

J8

J9

J2

DRY CONTACT

GND I5 I4 GND I3 I2 VOUTI1GNDI6

Figure 12. I5 - Dry Contact Wiring.

Installation Guide FCU Controller

20

INPUT 6 (I6) - EMERGENCY SHUTDOWN

Input must be wired to the Emergency Shutdown. Wiring for the I6 is shown

in Figure 13. To wire I6 to a dry contact:

1. Select the correct jumper setting for a dry contact on J4.

2. Connect one lead of the normally open dry contact to input terminal I6

on terminal block J2.

3. Connect the other lead to one of the GND terminals.

J9

J4

J5

J6

J7

J8

J9

GND I5 I4 GND I3 I2 VOUTI1GNDI6

J2

DRY CONTACT

Figure 13. I6 - Dry Contact Wiring.

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Johnson Controls NXA-FCU-01 Installation guide

Johnson Controls NXA-FCU-01 Installation guide

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