NXA-VNXA-V
NXA-VNXA-V
NXA-V
AA
AA
A
V-01V-01
V-01V-01
V-01
VARIABLE AIR VOLUME
CONTROLLER
Installation Guide
TEC DOC # LIT-TD-2001 09/2001
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
System Products www.johnsoncontrols.com
9410 Bunsen Parkway Revised 09/2001
Louisville, KY 40220 Printed in U.S.A.
FCC WARNING
The Federal Communications Commission (FCC) requirements pre-
scribe 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
transmission source.
• Make certain that the computing device is plugged into a
grounded outlet receptacle.
If necessary, contact Johnson Controls, Inc., for additional sugges-
tions.
Installation Guide VAV-01 Controller NexSys
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 equipment 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.
NexSys VAV-01 Controller Installation Guide
5
Table of Contents
VAV-01 Overview ..................................................................................... 6
Inspection .................................................................................................... 7
Requirements .............................................................................................. 7
Location ...................................................................................................... 7
Mounting..................................................................................................... 8
Airflow Sensor Connections ............................................................ 9
Wiring Connections ................................................................................... 11
Power Supply ............................................................................................. 11
Power Connections............................................................................ 11
Thermistor Wiring ............................................................................. 12
Digital Outputs ................................................................................... 13
Digital Outputs DO-1 and DO-2 - Damper Wiring ................. 14
Digital Output DO-3 - Fan Wiring ................................................ 15
Digital Output DO-4 and DO-5 - Electric Staged Reheat ........ 16
Digital Output DO-4 and DO-5 - Floating Reheat .................... 18
Digital Output DO-4 and DO-5 - Pulse Width Modulation .... 19
Warranty ...................................................................................................... 20
Warranty Limitations ......................................................................... 20
Disclaimer of Warranties .................................................................. 20
Purchaser’s Responsibility.................................................................. 20
Installation Guide VAV-01 Controller NexSys
6
VAV-01 OVERVIEW
The JCI VAV-01 Controller consists of a Variable Air Volume (VAV)
controller integrated with a velocity pressure sensor. It provides
pressure dependent/independent cooling control for fan powered VAV
terminal boxes with or without reheat capacity.
The VAV-01 Controller is a 4”x 6” circuit board using SMT (surface
mount technology) components. The board is snap-track mountable
and has a built-in airflow sensor, 5 Triac outputs, 24 VAC input, a FTT-
10 free topology transceiver and a STAT/Configuration port. The VAV-
01 can support stand-alone operation but is best utilized when used
in conjunction with network communications. The unit is shown in
Figure 1 below:
Network
Connection
ESUSA
Thermostat
Connection
}
Analog
Input
24VAC
Power
Input
}
Digital
Outputs
VAV-01 Cover
}
}
Airflow
Sensor
Inputs
(Pneumatic)
}
RESET
Pushbutton
Service
Pushbutton
Service
Pushbutton
LED
Service
RESET
P2
(HI)
Stat
Port
Status
LED
OUT TEST
THERM
TEMP
GND DO5 DO4 D03 D02 D01 NET +NET -STAT +STAT-
Output
Test
Jumper
P1
(LO)
GND
HOT
NEU
24VAC
D5
S3
D1
S1
S2
J4
J3
J2
J1
Figure 1. VAV-01 Controller.
NexSys VAV-01 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 Electronic Systems USA 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.
• VAV-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
CAUTION
• AVOID LOCATIONS WHERE EXCESSIVE MOISTURE, CORROSIVE
FUMES, EXPLOSIVE VAPORS, OR VIBRATIONS ARE PRESENT.
• AVOID ELECTRICAL NOISE INTERFERENCE. DO NOT INSTALL NEAR
LARGE CONTACTORS, ELECTRICAL MACHINERY, OR WELDING
EQUIPMENT.
• JCI VAV-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
Installation Guide VAV-01 Controller NexSys
8
DOES NOT EXCEED 85% OR FALL BELOW 5%, NON-CONDENSING.
MOUNTING
The JCI VAV-01 Controller can be mounted in any direction and on
any plane. Mounting dimensions are 4”x6” overall board size for
snap-track mounting. For applications requiring mounting using
standoffs the .150” circuit board mounting holes are spaced 3.5”x5.5”.
Dimensions shown in Figure 2 below are in inches and (mm).
When mounting the JCI VAV-01 Controller in the snap-track railing be
careful not to exert too much pressure when inserting the VAV-01
board into the snap-track.
NOTE:
Follow static electricity precautions when installing, servicing,
or operating the system.
GND
HOT
NEUTRAL
Service
RESET
HIGHLOW
THERM
TEMP
GND DO5 DO4 D03 D02 D01 NET +NET -STAT +STAT-
OUT TEST
4.00"
(102)
3.50"
(89)
.25"
(6)
.25"
(6)
5.50"
(140)
6.00"
(152)
1.315"
(33)
NexSys VAV-01 Controller Installation Guide
9
Figure 2. Mounting dimensions
.
AIRFLOW SENSOR CONNECTIONS
Use either 1/4 in. O.D. FRPE polyethylene tubing or 1/8 in. I.D.
Tygon tubing for piping connections. Maximum run of tubing is 5
feet.
1. Remove the yellow plastic fitting caps from the barbed fittings of
the VAV-01 airflow sensor inputs. See Figure 3 below.
2. Connect the tube from the low pressure fitting on the controller
to the low pressure tap on the airflow sensor. See Figure 3
below.
3. Connect the tube from the high pressure fitting on the controller
to the high pressure tap on the VAV terminal. See Figure 3
below.
Installation Guide VAV-01 Controller NexSys
10
Service
RESET
P2
(HI)
OUT TEST
THERM
TEMP
GND DO5 DO4 D03 D02 D01 NET +NET -STAT +STAT-
GND
HOT
NEU
24VAC
To HIGH pressure fitting on the airflow sensor.
To LOW pressure fitting on the airflow sensor.
P1
(LO)
Figure 3. Airflow Sensor Connections.
NexSys VAV-01 Controller Installation Guide
11
WIRING CONNECTIONS
POWER SUPPLY
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.
CAUTION
• WHEN POWERING MULTIPLE UL
LISTED CLASS 2 DEVICES FROM
THE SAME CLASS 2 POWER TRANSFORMER, POLARITY MUST BE
OBSERVED (24VAC HOT CONNECTED TO 24VAC HOT AND 24VAC
GND CONNECTED TO 24VAC GND).
• DO NOT GROUND THE SECONDARY OF THE POWER TRANS-
FORMER. THE TRANSFORMER FRAME MUST BE GROUNDED.
Specifications may change without notice as design improvements are
implemented.
POWER CONNECTIONS
The power connections to the VAV-01 are shown in Figure 4 below:
Installation Guide VAV-01 Controller NexSys
12
Service
RESET
GND
HOT
NEU
24VAC
D1
S1
S2
J2
24VAC HOT
NEUTRAL
CHASSIS GROUND
Figure 4. Power Connections.
THERMISTOR WIRING
The Thermistor wiring to the VAV-01 is shown in Figure 5 below:
NOTE: Only a 10K Type II (CP Curve) thermistor may be used.
Shielded Cable
Analog Input
Thermistor
Tie Shield To Chassis Ground
Ground
OUT TEST
THERM
TEMP
GND DO5 DO4 D03
D5
S3
NexSys VAV-01 Controller Installation Guide
13
Figure 5. Thermistor Wiring.
DIGITAL OUTPUTS
Digital outputs shown in Figure 6 below must be wired as follows:
• DO1 must be wired to Damper Increment.
• DO2 must be wired to Damper Decrement.
• DO3 must be wired to the fan, if one is used.
• DO4 must be wired to heating element 1 for staged reheat, incre-
ment for floating reheat, or the pulse width modulator.
• DO5 must be wired to heating element 2 (and heating element 3, if
it is used) for staged reheat, or decrement for floating reheat. If pulse
width modulation is used, DO5 is a spare output.
Installation Guide VAV-01 Controller NexSys
14
DAMPER
INCREMENT
DAMPER
DECREMENT
FAN
REHEAT 1/
INCREMENT/PWM
REHEAT 2/
DECREMENT
THERM
TEMP
GND
DO5 DO4
D03
D02
D01
Figure 6. Digital Outputs.
DIGITAL OUTPUTS DO-1 AND DO-2 - DAMPER WIRING
NexSys VAV-01 Controller Installation Guide
15
Wiring for Damper Activator Motor Increment and Decrement is
shown in Figure 7 below:
NOTE: The rating for these outputs is 0.5 amps at 24VAC.
THERM
TEMP
GND
DO5 DO4
D03
D02
D01
24VAC
INCREMENT
DECREMENT
COMMON
BELIMO
Made in Switzerland
NM24 US
123
blk red wht
COM + +
24 VAC/DC
50/60 Hz
2W
53 in-lb (6Nm)
L
R
LR 92800
LISTED
94D5
TEMP.IND. &
REG. EQUIP.
class 2 supply
U
L
R
5/16
1/2
5/8
8
12
16
Figure 7. Damper Wiring.
DIGITAL OUTPUT DO-3 - FAN WIRING
Wiring for a Fan is shown in Figure 8 below:
NOTE: The rating for this output is 0.5 amps at 24VAC.
Installation Guide VAV-01 Controller NexSys
16
= RELAY
THERM
TEMP
GND
DO5 DO4
D03
D02
D01
R
24VAC HOT
R
Figure 8. Fan Wiring.
DIGITAL OUTPUT DO-4 AND DO-5 - ELECTRIC
STAGED REHEAT
Wiring for Staged Reheat is shown in Figure 9 below:
NexSys VAV-01 Controller Installation Guide
17
Digital Outputs DO-4 and DO-5 can also be used for Floating Reheat
or Pulse Width Modulation. If you are using two stage reheat, each
heating element is wired to a digital output. If three heating elements
are used for three stage reheat, the first element is wired to DO-4,
and the second and third elements are wired to DO-5. If two heating
elements are used for three stage reheat, the smaller heating element
is wired to DO-4, and the larger heating element is wired to DO-5.
NOTE: The rating for these outputs is 0.5 amps at 24VAC.
Installation Guide VAV-01 Controller NexSys
18
THERM
TEMP
GND
DO5 DO4
D03
D02
D01
24VAC
R2
R1
= RELAY
R
Two Wire Reheat Three Wire Reheat
DO4 (R1) Heating Element 1 Heating Element2
DO5 (R2) Heating Element 2 Heating Element 2 & 3
NOTE: This applies to two and three stage electric reheat.
Figure 9. Staged Reheat.
DIGITAL OUTPUT DO-4 AND DO-5 - FLOATING
REHEAT
Floating Reheat uses the Increment and Decrement commands and is
shown in Figure 10 below:
NOTE: The rating for these outputs is 0.5 amps at 24VAC.
NexSys VAV-01 Controller Installation Guide
19
24VAC HOT
THERM
TEMP
GND
DO5 DO4
D03
D02
D01
INCREMENT
DECREMENT
COMMON
Figure 10. Floating Reheat.
DIGITAL OUTPUT DO-4 AND DO-5 - PULSE WIDTH
MODULATION
Pulse Width Modulation uses the DO-4 and is shown in Figure 11
below. DO5 is a spare output when Pulse Width Modulation is used.
NOTE: The rating for these outputs is 0.5 amps at 24VAC.
24VAC
THERM
TEMP
GND
DO5 DO4
D03
D02
D01
TO PULSE WIDTH
TRANSDUCER
+
-
24VAC COMMON
Figure 11. Pulse Width Modulation.
WARRANTY
Johnson Controls, Inc., warrants this
product to be free from defects in
workmanship and materials for two (2)
years from the date of purchase. If the
product does not operate as warranted
during the applicable warranty period, it
will be repaired or replaced by Johnson
Controls, Inc., at no charge to you.
JOHNSON CONTROLS, INC. EXPRESSLY
RESERVES THE RIGHT TO REPAIR OR
REPLACE THIS EQUIPMENT WITH NEW
OR REFURBISHED PARTS OR EQUIP-
MENT.
The original purchaser must notify
Johnson Controls, Inc., in writing if there
is a defect in material or workmanship.
Written notice in all events must be
received by Johnson Controls, Inc. before
expiration of the warranty period.
WARRANTY LIMITATIONS
This warranty covers normal use.
Johnson Controls, Inc. does not warrant:
-Damage caused by misuse, mishandling,
accident, or acts of God
-Damage caused by the use of this
product for purposes other than those for
which it was designed
-Damage caused by improper installation
-Compatibility with the equipment from
any other manufacturer
-Damage caused by unauthorized
attachments, alterations, or modifications
made to the equipment to make it
compatible with the equipment of any
other manufacturer
DISCLAIMER OF WARRANTIES
THE WARRANTY STATED ABOVE IS
THE ONLY WARRANTY APPLICABLE
TO THIS PRODUCT. ALL OTHER
WARRANTIES, INCLUDING THE
IMPLIED WARRANTY OF MERCHANT-
ABILITY AND OF FITNESS FOR A
PARTICULAR PURPOSE GIVEN TO
YOU BY LAW ARE HEREBY LIMITED
IN DURABILITY TO THE DURATION
OF THIS WARRANTY. UNDER NO
CIRCUMSTANCES WILL JOHNSON
CONTROLS, INC. BE LIABLE FOR
DIRECT, INDIRECT, SPECIAL, INCIDEN-
TAL, OR CONSEQUENTIAL DAMAGES
ARISING OUT OF THE USE OF THIS
PRODUCT.
Some states do not allow limitation on
how long an implied warranty lasts, so
the above limitation may not apply to
you. Some states do not allow the
exclusion or limitation of incidental or
consequential damages, so the above
limitation or exclusion may not apply to
you. This warranty gives you specific
legal rights, and you may also have other
rights which vary from state to state.
PURCHASER’S RESPONSIBILITY
In order to obtain service under this
warranty, you must deliver the equipment
to the place of purchase or to JCI and
provide proof of the original purchase
date along with the returned equipment.
Failure to provide adequate proof of the
original purchase date could result in
denial of warranty service.
You may obtain copies of this document
by ordering document number LIT-TD-
2001.
/