Johnson Controls NXA-FCU-01 User manual

NXA-FCU-01NXA-FCU-01
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.
© 2001 Johnson Controls, Inc. All Rights Reserved
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.

InstallationGuide 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 InstallationGuide
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

InstallationGuide 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
ower
Input
Inputs
Cover
Status
LED
Output
Test
ushbutton
Service
LED
RESET
ushbutton
Network Connection
Thermostat Connection
}
}
Service
ushbutton
}
Digital
Outputs
}
Configuration
ort lug
Figure 1. FCU-01 Controller.

FCU Controller InstallationGuide
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 VIBRATIONSARE
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.

InstallationGuide 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 InstallationGuide
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.

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

FCU Controller InstallationGuide
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
Previo s Device
LON From
Previo s Device
LON To
Next Device
Note:
T-Tap length m st 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.

InstallationGuide 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
THERMOSTATAND 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 InstallationGuide
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/Ret rn
Air Temp
UI4
O tsideAir/
S pply
Water Temp
UI5
Fan Stat s
UI6
Emergency
Sh tdwon
J4
J5
J6
J7
J8
J9
GND I5 I4 GND I3 I2 VOUTI1GNDI6
Figure 6. Inputs.

InstallationGuide 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 InstallationGuide
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
J9
J4
J5
J6
J7
J8
J9
J2
THERMISTOR
GND I5 I4 GND I3 I2 VOUTI1GNDI6
Figure 8. I1 - Thermistor Wiring.

InstallationGuide 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 InstallationGuide
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.

InstallationGuide 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 InstallationGuide
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.

InstallationGuide 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
J4
J5
J6
J7
J8
J9
GND I5 I4 GND I3 I2 VOUTI1GNDI6
J2
DRY CONTACT
Figure 13. I6 - Dry Contact Wiring.