Johnson Controls METASYS VAV110, METASYS VAV111, METASYS VAV101, METASYS VAV100, METASYS VAV141 Technical Manual
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Application Specific Controllers Technical Manual 636.3
VAV Controller Section
Technical Bulletin
Issue Date 0309
Variable Air Volume (VAV) Controller
Introduction Page 5
Description 5
OEM Applications 8
Standards Compliance *
Coordination of Factory Mounted VAV Systems
8
8
Configuring the Controller 11
Using HVAC PRO for Windows Configuration Tool 11
Defining a VAV Control Device Object in Metasys Software 13
Installation Procedures 17
Tools Needed 17
Environmental Information 17
Mounting the Controller 18
Power Line Wiring Transient Noise Precautions 21
I/O and Communication Lines Wiring Transient Noise Precautions 23
* Indicates those sections where changes have occurred since the last printing.
© 2009 Johnson Controls, Inc. 1
Code No. LIT-6363040
Wiring Details Page 25
Power Source and Loads 26
Grounding and Isolation 27
I/O and Communication Terminals 29
Power, Zone Bus, and N2 Connections 36
Analog Inputs 36
Binary Inputs 38
Binary Outputs 38
Analog Outputs 38
Zone Bus
Wiring to RLY50/002 Relays
39
39
Wiring Sensors and Actuators 40
Networking the Controller 45
N2 Bus Overview 45
Installing the N2 Bus 46
Zone Bus Commu nications 49
Application Examples 51
Single Duct Applications 51
Dual Duct Applications 63
Downloading/Commissioning 71
Via Zone Bus 71
Via N2 Bus
71
Incremental Valve Actuator Stroke Time
Incremental Damper Actuator Stroke Time
Zone Terminal Setup for Balancing Contractors
* Indicates those sections where changes have occurred since the last printing.
2 VAV Controller—Variable Air Volume (VAV) Controller
72
73
73
Troubleshooting Page 75
Hardware Installation Inspection 75
Tools Needed for Troubleshooting 75
Installation Checkout 76
Troubleshooting the VAV Controller with HVAC PRO for Windows 81
Troubleshooting the N2 Bus and Networked VAV Controller 82
Zone Bus Troubleshooting -- HVAC PRO for Windows 83
Ordering Information 85
Johnson Controls Code Numbers 85
Vendor Code Numbers
87
Specifications *89
* Indicates sections where changes occurred since the last printing.
VAV Controller—Variable Air Volume (VAV) Controller 3
4 VAV Controller—Variable Air Volume (VAV) Controller
12FIntroduction
Description
The Variable Air Volume (VAV) Controller is an electronic device for
digital control of single duct, dual duct, fan powered, and supply/exhaust
VAV box configurations. See 50HFigure 1. You may use the VAV as a
standalone controller or connected to the Metasys network through a
Network Control Module (NCM) or Companion system.
When connected to the Metasys Network, the VAV provides all point and
control information to the rest of the network. The devices communicate
through an N2 Bus.
Each VAV Controller application uses a different sequence of operation,
all of which are covered in the HVAC PRO for Windows User’s Manual
(FAN 637.5).
VAV Controller—Variable Air Volume (VAV) Controller 5
T
R
1 2 3 4 5 6
1 2 3 4 5 6
ANALOG INPUTS
1 2 3 4 5 6 1 2 3 4
ANALOG INPUTS
COMMON
BINARY INPUT
BINARY COM
BINARY INANALOG INPUTS BINARY OUTPUTS
R
DSI
P5
Z BUS
P6
TO
ZONE
STAT
BINARY OUTPUT
1 2 3 4 5 6 7 8
1 2 3 4 5 6 1 2 3 4
1 2 3 4 5 6
ANALOG INPUTS
1 2 3 4 5 6
COMMON
ANALOG INPUTS
Figure 1: VAV110 (top) and VAV111 (bottom) Controller
6 VAV Controller—Variable Air Volume (VAV) Controller
BINARY INPUTANALOG INPUTS
BINARY COM
BINARY IN
DSI
Z BUS
BINARY OUTPUT
TO
1 2 3 4 5 6
ZONE
STAT
BINARY OUTPUTS
ANALOG
OUTPUT
1 2
ANA OU
110-111
Table 1: VAV Controller Model Features
Feature VAV100/101
(Discontinued)
Ambient
Temperature
Rating
Analog Inputs
Binary Inputs
Analog
Outputs
Binary
Outputs
N2 Bus
Zone Bus
24 VAC Power
Terminations
I/O
Terminations
N2
Terminations
* VAV Controller model feature differences
32 to 122F
(0 to 50C)
6
RTD temperature
elements (1000 ohm
nickel, platinum, or
silicon)
2k ohm setpoint
potentiometers
0 to 10 VDC or
0 to 2 VDC
transmitters
4
(4) Dry contacts
(1) Momentary push
button from zone
sensor for temporary
occupancy mode
BI 4 may be used as
an accumulator input
for frequencies less
than 100 Hz.
0/2
0 to 10 VDC
@ 10 mA
8/6
24 VAC Triacs
@ 0.5 amperes
Not Isolated * Isolated Isolated
Discrete connections
at controller
8-pin phone jack on
controller
6-pin phone jack at
zone sensor
LED Indication * LED Indication *
Quick Connects
(Spade Lugs) *
Quick Connects
(Spade Lugs)
Fixed Screw Terminal
Block *
VAV110/111 VAV140/141
32 to 122F
(0 to 50C)
6
RTD temperature
elements (1000 ohm
nickel, platinum, or
silicon)
2k ohm setpoint
potentiometers
0 to 10 VDC or
0 to 2 VDC
transmitters
4
(4) Dry contacts
(1) Momentary push
button from zone
sensor for temporary
occupancy mode
BI 4 may be used as
an accumulator input
for frequencies less
than 100 Hz.
0/2
0 to 10 VDC
@ 10 mA
8/6
24 VAC Triacs
@ 0.5 amperes, or
0.8 amperes if total
power is limited
Discrete connections
at controller
8-pin phone jack on
controller
6-pin phone jack at
zone sensor
Removable Screw
Terminal Block
Quick Connects
(Spade Lugs)
Removable Screw
Terminal Block
32 to 122F
(0 to 50C)
6
RTD temperature
elements (1000 ohm
nickel, platinum, or
silicon)
2k ohm setpoint
potentiometers
0 to 10 VDC or
0 to 2 VDC
transmitters
4
(4) Dry contacts
(1) Momentary push
button from zone
sensor for temporary
occupancy mode
BI 4 may be used as
an accumulator input
for frequencies less
than 100 Hz.
0/2
0 to 10 VDC
@ 10 mA
8/6
24 VAC Triacs
@ 0.5 amperes, or
0.8 amperes if total
power is limited
Discrete connections
at controller
8-pin and 6-pin phone
jack on controller *
6-pin phone jack at
zone sensor
Removable Screw
Terminal Block
Fixed Screw Terminal
Block *
Removable Screw
Terminal Block
VAV Controller—Variable Air Volume (VAV) Controller 7
3F4F5FOEM
Applications
6F7F8FStandards
Compliance
9F10F11FCoordination of
Factory
Mounted VAV
Systems
When providing VAVs for projects which use Trane or TITUS
terminal boxes, consider using the AS-VAVDPTx-1 product (refer to
Building VAVDPT Applications Application Note (LIT-6363042) in the
Application Specific Controllers Technical Manual (FAN 636.3). Trane
and TITUS are both Original Equipment Manufacturers (OEMs) who
provide VAV terminal boxes for projects. Trane typically provides the
damper actuator with their terminal box, and TITUS provides the damper
actuator with their QFPC Series Fan Powered Box. The VAVDPT comes
in two models, which include a VAV Controller and a DPT-2015 Velocity
Pressure Transducer. The DPT is mounted and prewired to the cover of
the VAV. Refer to the OEM Reference Manual (FAN 638).
The VAV Controller complies with the following standards:
z FCC Part 15, Subpart J, Class A
z IEEE 472, IEEE 518
z IEEE 587 Category A
z UL 916 Listed
z VDE 0871 Class B
A factory mounted VAV box control system requires close coordination
between a variety of different disciplines. Refer to the OEM Reference
Manual (FAN 638) for factory manufacturer’s details. Although the
responsibilities may differ per city or region, the following parties are
usually involved on the job:
z controls contractor
z mechanical contractor
z local VAV box manufacturer’s representative
z balancing contractor
z electrical contractor
Typically, the mechanical contractor is the focal point for coordinating the
entire process. The basic responsibilities under the domain of the
mechanical contractor are:
1. Purchasing the VAV box system. Most specifications include the
OEM mounting fees and enclosures for the control system in the
mechanical contractor’s price. Mounting fees vary per box
manufacturer but ranges can be found in the OEM Reference Manual
(FAN 638).
2. Providing the release schedule for the VAV boxes to the job.
3. Contracting, or working closely with, the balancing contractor to
ensure the system is set up per the mechanical prints.
Note: The owner often directly hires the balancing contractor. This
ensures neutrality in dealing with other contractors involved in the
project.
8 VAV Controller—Variable Air Volume (VAV) Controller
In conjunction with the mechanical contractor, the controls contractor’s
responsibilities include:
1. Coordination of the control system release schedule to the box
manufacturer to ensure the mechanical system delivery schedule can
be met. Coordination with the local box manufacturer representative is
normally required.
2. Coordination with the electrical contractor to ensure the following
steps are covered.
z 24 VAC power is provided at each VAV Controller.
z N2 Bus wiring is pulled and terminated.
z Valve actuator wiring is pulled and terminated.
z Zone sensor cables are pulled. The use of phone cable for
terminating zone sensor wiring allows basically anyone to
terminate zone sensors in certain locales.
z If desired, the N2 address switches can be set by the electrical
contractor.
3. Initial loading of the HVAC PRO for Windows configuration files is
done once the electrical contractor’s functions are completed in
preparation for the final system balancing.
4. Training of the balancing contractor to ensure the balancing contractor
knows how to use the Zone Terminal (ZT) or HVAC PRO for
Windows Commissioning mode so they can perform the final system
balancing.
5. Mounting and terminating the cable connections for the zone
temperature sensor. Set the N2 address switch if the electrical
contractor was not contracted to perform this function.
6. Configuring, downloading, and commissioning the controller.
VAV Controller—Variable Air Volume (VAV) Controller 9
10 VAV Controller—Variable Air Volume Controller
12F13F14FConfiguring the Controller
Using
HVAC PRO
for Windows
Configuration
Tool
Use HVAC PRO for Windows to configure the VAV. VAV110/111 and
VAV140/141 models require HVAC PRO for Windows. HVAC PRO for
Windows also works with the VAV100/101 models. This easy-to-use
software tool configures, commissions, and downloads the VAV
Controller’s data base.
51HFigure 2 illustrates the HVAC PRO for Windows configuration process.
Refer to the HVAC PRO for Windows User’s Manual (FAN 637.5) for
specific information when configuring the VAV Controller.
VAV Controller—Variable Air Volume (VAV) Controller 11
Sta rt HVAC PRO for Wind ows
Sele ct F il e -Ne w
1. Select VAV Applications.
2. Select Single or Dual Duct.
Complete Q/A Session
Complete Configuration Process
1. Fill in job information.
- O p tion - Jo b In fo rma tio n
2. Review and change inputs/outputs.
3. Review and change default parameters.
Save Co nfiguration
1. File - Save As
2. Select device type.
Download Controller
1. Attach MM-CVT101-1 Converter
or AS-CBLPRO-2.
2. Select Download - Current Configuration.
Comm ission Controller
1. Attach MM -CVT101-1 Converter
or A S-C BLP RO - 2 .
2. Select Commission - Current Configuration.
3. Sele c t Bus ty p e , c o mm. po rt, a n d
N 2 a ddre ss (if N2 Bus ).
4. Select OK.
5. View / Adjust parameter values.
3. Enter file name for configuration file.
3. S elec t Bus type, c o mm . p o rt, a n d
N 2 address (if N2 Bus).
4. Select OK.
6. Re v ie w contr o ller in fo rma t io n .
7. Exit Co mm is s ioning.
8. If adjustments were made, save
changes to controller and to file.
9. Unplug MM-CVT101-1 or AS-CBLPRO-2..
PRO FLO 40
Figure 2: Steps in Configuring a VAV Controller Using
12 VAV Controller—Variable Air Volume Controller
Exit HVAC PRO for Windows
HVAC PRO for Windows
Note: You can load and commission the controller either locally with the
AS-CBLPRO-2 interface at the zone sensor (Figure 15) or from a
central location where the N2 has been pulled, controller’s field
hardware addressed, and an MM-CVT101-1 interfaced to the laptop.
15F16F17FDefining a VAV
Control Device
Object in
Metasys
Software
Using a Metasys Network system, you need to define a VAV Controller
device object by entering data into the Attribute menu as seen on the
Operator Workstation.
1. Go to the Network Map.
2. Double-click the system name in which you want to add the new VAV
object.
3. Click New in the Item pull-down menu.
4. Click on Type: N2 devices in the Item New dialog box.
VAV - Item New
Type
Accumulator
Analog data
Analog input
Analog output digital
Analog output setpoint
Binary data
Binary input
Binary output
MS data
MS input
Hardware system name:
MS output
Control system
DL/LR group
LC group
PID loop
Fire Zone
L2 devices
N2 devices
S2 devices
Card Reader
OK
CANCEL
Hardware object name:
Copy of (System\Object):
ITEM NEW
Figure 3: Item New Dialog Box
Note: The Hardware System and Hardware Object text fields are not
used for this object type.
5. Click OK to display the Add N2 Device dialog box.
VAV Controller—Variable Air Volume (VAV) Controller 13
c
j
Hardware -- Add N2 Device
Device Type
A
HU
D
600
DCM
DR
9100
DX91 00
IFC-2020
LCD
VAV
OK
CANC
EL
n2dv
Figure 4: Add N2 Device Dialog Box
6. Highlight VAV.
7. Click OK to display the VAV Definition window (52HFigure 5).
VAV Definition
Item Ed
Towe
it View Action Go To Accessory
r_ I
Floor
1
Bookmark
Help
System Nam e
Ob
ject
Name
Expanded I
NC
Graphic Symbol #
Ope
Name
rating Instr.
D
#
Hardware
NC #5
1
1
Hardware
N2 Trunk Numbe
N2 Device
Po
ll Priorit
Addres
y
Comm Disabled
Flag
r
s
1
0
3
s
Auto Dialou
N
t
N
windob
Figure 5: VAV Control Device Object Definition Window
Note that some of the fields in the window are blank and some are already
filled in. You must fill in the blank attribute fields of required attributes.
An N2 device address from 1 to 255 must also be specified. Attribute
fields that are already filled in contain default values that may be accepted
or changed.
14 VAV Controller—Variable Air Volume Controller
Table 2 explains the blank attributes. The Operator Workstation User’s
Manual (FAN 634) describes the general procedures for entering and
modifying data.
Table 2: Blank VAV Object Attributes
Attribute Description Entry Values . . .
Object Name
Expanded ID
Identifies the object
(i.e., ILC). The object name
cannot be duplicated in the
system.
Further identifies the object
(i.e., LC Device 1)
1 to 8 alphanumeric
characters
0 to 24 alphanumeric
characters
(Optional)
8. To save the new VAV object, select Save from the Item pull-down
menu. The object is added to the NCM data base.
9. Upload the NCM to make an archive copy of the new object following
the instructions in the Operator Workstation User’s Manual (FAN
634), the Advanced User’s Guide tab, the Uploading and Downloading
Data Bases chapter, the Uploading from the NCM section.
Modifying and
Monitoring the
VAV Object
Once you have defined the VAV object, you can modify or monitor its
attribute values online using the VAV object Focus window. See the
Operator Workstation User’s Manual (FAN 634) for more information on
using Focus windows.
VAV Controller—Variable Air Volume (VAV) Controller 15
16 VAV Controller—Variable Air Volume Controller
18F19F20FInstallation Procedures
Instructions for the installation of the VAV Controller and its accessory
devices are detailed in this section. The types and numbers of components
(sensors and actuators) selected for use with the VAV vary according to
application. Analyze the proposed installation for logical places to locate
these devices and draw up an inventory based on that study. Information
on types of accessory devices available is in the Ordering Information
section of this technical bulletin.
Most VAV installation should be coordinated with the VAV box
manufacturer for factory mounting. The OEM Reference Manual
(FAN 638) describes the steps and pricing to coordinate a factory mount
solution.
Tools Needed
21F22F23FEnvironmental
Information
Tools needed for a typical installation include:
HVAC PRO for Windows currently released software
IBM PC-compatible laptop computer
Windows 3.x or Windows 95
two screwdrivers (1/8 in. and 1/4 in. flat-blade)
AS-CBLPRO-2 (Zone Bus communication tool)
MM-CVT101-0 (N2 Bus communication tool)
AS-ZTU100-1 (Zone Bus interface to application specific controllers)
The installation site of the VAV Controller must meet the following
environmental standards.
The atmosphere must be free of explosive vapors or escaping gases.
The atmosphere must be free of exposure to corrosive chemical or salt
vapors, which might damage electrical equipment.
The temperature must be maintained between 32 to 122F (0 to 50C)
with the relative humidity (non-condensing) maintained between 10 and
90%.
The power line must be “clean,” without electrical noise transients that
are often present in industrial environments. Commercial and
residential buildings typically have clean power, but may not, depending
on the location, nearby equipment, etc. Follow the power line wiring
transient noise precautions.
VAV Controller—Variable Air Volume (VAV) Controller 17
24F25F26FMounting the
Controller
Factory Mounting
Typically the most cost effective and highest quality installation of the
VAV Controller, EDA-2040 Damper Operator, and DPT-2015 Velocity
Pressure Transducer can be accomplished by the box manufacturer. The
OEM Reference Manual (FAN 638) describes the relationship, pricing, and
process to accomplish factory mounting of the VAV control system at most
of the key box manufacturers.
If the job cannot be factory mounted, check with the VAV box
manufacturer to determine if a control enclosure for the VAV Controller
and Actuator/Velocity Pressure Transducer combination is already
available on the VAV box. If there is not an available enclosure, the
common packaging for the VAV Controller is an enclosure provided by the
contractor or the Johnson Controls EN-EWC10, EN-EWC15, BZ1000, or
AS-ENC enclosure. The controller requires a flat mounting surface area to
match its dimensions:
6.5 x 6.4 x 2.2 in./165 x 163 x 56 mm (H x W x D) without enclosure
6.8 x 7.3 x 4.7 in./173 x 185 x 119 mm (H x W x D) with the
AS-ENC100-0 enclosure
7 x 13 x 6 in./180 x 330 x 150 mm (H x W x D) with the
EN-EWC10-0 and EN-EWC15-0 enclosure
Make sure you allow enough room to install the enclosure and conduit for
wiring terminations to the controller. 53HFigure 7 shows a common packaging
configuration for the VAV Controller.
18 VAV Controller—Variable Air Volume Controller
TM
+15VDC
+15VDC
24VAC
24VAC
TRACS
COMMON
COMMON
COMMON
COMMON
Low Voltage
Wiring Trough
COMMON
vavpwer
Figure 6: EWC10 Enclosure with VAV Controller
and 50 VA Transformer
Mounting the
VAV into a
Universal
Packaging
Module
Field Mounting
The VAV can be directly mounted into an EWC10/15 enclosure. You may
also purchase the VAV premounted in a EWC10 enclosure with a
50 VA transformer. Refer to the Application Specific Controllers
Technical Manual (FAN 636.3) for instructions on mounting the enclosure
to a wall.
To mount the VAV in the EWC10:
1. Orient the VAV so that its terminals face the low voltage wiring
trough (Figure 6).
2. Align the three mounting holes in the base of the controller with the
holes in the back of the enclosure. On the side with four mounting
holes, use the two outside holes for mounting in the EWC. See the
Universal Packaging Module Technical Bulletin (FAN 636.3) for a
more detailed explanation.
3. Secure the controller with three No. 8 x 1 in. screws. For best results,
use a plastite-type thread. A thread-forming or sheet metal thread type
may also be used.
Position the controller (or controller’s enclosure) on the mounting surface
before installation to ensure the calculated mounting area is correct. You
can make precise measurements for distance between controller terminals
and sensor/actuator mounting points on the VAV terminal. Confirm
electrical power source and conduit requirements prior to mounting.
VAV Controller—Variable Air Volume (VAV) Controller 19
(
)
You can install a VAV Controller into a control panel or an AS-ENC100-0
enclosure.
Do not use this knockout.
Otherwise, controller wil l
be in the way of wiring.
2
Top / Bottom
3
3
VAV Controller
1
VAV Enclosure
5
vavencl2
Cover
4
Side
Figure 7: Installing the VAV Controller in an Enclosure Kit
Mount the VAV in any convenient location using the predrilled mounting
holes. The controller must be mounted on a wall or panel where it can be
easily wired through the enclosure cover. Mount the VAV vertically for
best DPT (differential pressure transmitter) performance. The same
instruction applies to remote location packages. Refer to
54HFigure 7 when
installing a VAV Controller.
1. Secure the VAV inside the enclosure kit , using three screws
through the mounting tabs on the sides of the controller board base.
2. Position the VAV and enclosure so that it rests firmly against the
mounting surface.
3. Using a flat-blade screwdriver and pliers, remove the necessary wire
passage knockouts .
Note: Do not use knockouts on the opposite sides of enclosure, as you
will not be able to remove the VAV board.
4. Attach the enclosure cover after installing wiring.
20 VAV Controller—Variable Air Volume Controller
27F28F29FPower Line
Wiring
Transient Noise
Precautions
Surge Levels
The standard VAV Controller, when powered by any typical separate
isolation transformer or step-down transformer, operates reliably in an
electrical environment defined as Location Category A by the IEEE 587
Standard, that is, when installed more than 30 feet/9 meters from
electrical distribution panels or major bus and feeder systems in industrial
plants.
IEEE 587 Location Category A power line surge/noise level is specified at
6 kV, 500A (Normal Mode Ringwave).
In addition, the VAV Controller actually exceeds this category
specification by meeting these surge levels as well:
IEEE-587 style Common Mode Pulse: 1.5 kV, 3 kA
IEEE-587 style Normal Mode Pulse: 3 kV, 3 kA
IEEE-472 style Common Mode Ringwave: 1.5 kV
IEEE-472 style Normal Mode Ringwave: 500V
You must take further precautions to prevent unwanted Binary Output
cycling or other possible controller malfunctions, such as resetting, when
the controller is installed within 30 feet/9 meters of electrical distribution
panels or major bus and feeder systems in industrial plants. This electrical
environment is defined as Location Category B by the IEEE 587 Standard.
To prevent electrical noise from adversely affecting the controller:
1. Connect an MOV (Metal Oxide Varistor) across the VAV supply
transformer primary. The MOV must be rated appropriately for the
line voltage.
2. Use the list in Table 3 to select the correct MOV sold through your
electronics parts distributor.
The VAV Controller meets the following power line surge/noise standards
when you correctly apply the MOV as described.
IEEE-577 Common Mode Pulse 1.5 kV, 3 kA
Normal Mode Pulse 6 kV, 3 kA
Normal Mode Ringwave 6 kV, 500A
IEEE-472 Common Mode Ringwave 1.5 kV
Normal Mode Ringwave 500V
VAV Controller—Variable Air Volume (VAV) Controller 21
Table 3: MOV Selection
Power Transformer Primary Voltage
Minimum Continuous
Voltage Rating
Minimum Energy Rating
Minimum Peak Current
(8 x 20 second pulse)
UL Recognized
Harris
Iskra
Malda
Mallory
Marcon
Oneida (CKE)
Panasonic
Phillips
Siemens
Stetron
Thomson
* Indicates the preferred model if several are listed.
120 VAC 208 to 240 VAC 277 VAC 347 VAC
130 to 135 VRMS 250 to 280 VRMS
Only 250V types listed
30 Joules 55 Joules 80 Joules 85 Joules
4,000 Amperes 4,000 Amperes 4,000 Amperes 4,000 Amperes
Required Required Required Required
V130LA10A
V130LA20A*
V130LA20B*
V130K14
V130K20*
D6321ZOV131RA15*
D6521ZOV131RA20*
D6921ZOV131RA09
VSAC14DK201U
VSAC20DK201U*
TNR15G211KM
TNR23G201KM*
TNR23G211KM*
OZ130LA10A
OZ130LA20A*
OZ130LA20B*
OZ21L221
0216NR14-3
0216NR20-4*
ERZ-C14DK201U
ERZ-C20DK201U*
2322-595-51316 2322-595-52516 2322-595-53016 2322-595-53816
S14K130
S20K130*
0216NR14-3
0216NR20-4*
0216NR20DB*
VE17M00131K
VD24M00131K
V250LA20A
V250LA40A*
V250LA40B*
V250K14
V250K20*
D6321ZOV251RA90*
D6521ZOV251RA130*
D6921ZOV251RA72
VSAC14DK391U
VSAC20DK391U*
TNR15G391KM
TNR23G391JM*
TNR23G391KM*
OZ250LA20A
OZ250LA40A*
OZ250LA40B*
ERZ-C14DK391U
ERZ-C20DK391U*
S14K250
S20K250*
0390NR14-3
0390NR20-4*
0416NR14-3
0416NR20-4*
VE17M00251K
VD24M00251K
300 to 320 VRMS 385 VRMS
None None
V300K14
V300K20*
D6321ZOV301RA105*
D6521ZOV301RA150*
D6921ZOV301RA80
VSAC14DK471U
VSAC20DK471U*
TNR15G471K
TNR23G471K*
OZ21L471 None
ERZ-C14DK471U
ERZ-C20DK471U*
S14K300
S20K300*
0620NR14-3
0620NR20-4*
VE17M00301K
VD24M00301K
V385K14
V385K20*
None
VSAC14DK621U
VSAC20DK621U*
None
ERZ-C14DK621U
ERZ-C20DK621U*
S14K385
S20K385*
0620NR14-3
0620NR20-4*
None
22 VAV Controller—Variable Air Volume Controller
I/O and
Communication
Lines Wiring
Transient Noise
Precautions
The I/O wiring and N2 Bus must be clean, without electrical noise
transients from nearby lightning, heavy equipment switching, or inductive
loads being driven.
For the N2 Bus, the Transient Eliminator, model TE/JC04C12, made by
Advanced Protection Technologies (APT) is recommended. Refer to the
Metasys Network Technical Manual (FAN 636), the N2 Communications
Bus Technical Bulletin (LIT-636018) for more information.
VAV Controller—Variable Air Volume (VAV) Controller 23
24 VAV Controller—Variable Air Volume Controller
30F31F32FWiring Details
Take special precautions and follow certain grounding procedures when
installing the VAV Controller.
!
CAUTION: Possible Equipment Damage or Electrical Shock.
To avoid damaging equipment or possible electrical
shock, ensure that all power supplies to the system
have been disconnected prior to wiring installation.
The CMOS (Complimentary Metal Oxide
Semiconductor) circuits used in the controller are
static sensitive. Use static protection (anti-static mats
and/or grounding straps) when working on or near
internal circuitry.
Follow these precautions:
z Make all wiring connections in accordance with the National Electrical
Code (NEC) as well as within local regulations.
z Locate equipment and route the wiring so that signal wiring is twisted
pair, and separated from power wiring to the maximum extent possible.
To establish tight, reliable electrical connections, use the correct wire
sizes for the terminals.
z Make all wiring connections to the VAV Controller using only copper
conductors.
z The N2 must be daisy-chained. The use of Y or T connections without a
repeater installed in the T tap may cause loss of communications.
z Do not run N2 Bus, Zone Bus, Analog Input (AI), Binary Input (BI), or
Binary Output (BO) wiring in the same conduit as line voltage wiring
(above 30 VAC), or with wiring that switches power to highly inductive
loads such as contactors, coils, motors, or generators.
z Do not run non-shielded N2 Bus wiring in the same conduit or bundle as
24 VAC power wiring.
z You may run Zone Bus, Analog Input, Analog Output, and Binary Input
wiring in the same bundle or conduit where convenient. If the Binary
Output wiring is not wired through other switches or contacts, you may
also bundle it with the other I/O wiring where convenient.
VAV Controller—Variable Air Volume (VAV) Controller 25
Power Source
and Loads
Use a separate isolation transformer or step-down transformer for each
VAV Controller. Refer to Standards Compliance in the Introduction
section of this technical bulletin. The power transformer used must comply
with:
z CSA 22.2 No. 205
z NEMA ICS 2, Part 2, 230
Limit the power to each VAV to 3 amperes or less. However, if you use
one low voltage power trunk to power multiple controllers, follow these
precautions:
z Ensure polarity is maintained at each 24 VAC connection.
z As per NEC code, you must enclose 24 VAC power trunks with
greater than 4 amperes (100 VA) in conduit.
Note: See NEC Article 725/Class 2 (30 VRMS Max) and (100 VA Max).
Any individual binary output (triac) can drive up to 800 mA when you
limit the total 24 VAC power draw. You must limit the power draw of a
controller and its load to avoid heat dissipation problems. You must limit
the total 24 VAC power draw of a VAV Controller installed in an
enclosure to a maximum of 40 VA. You must limit the total 24 VAC
power draw of a VAV Controller mounted in an open air environment to a
maximum of 75 VA.
When you determine the system load, consider all the actual loads as well
as the basic load of the controller. The following tables assist you in
determining the total 24 VAC power draw of your system.
Table 4: VAV Power and Load Specifications
System Loads Power Draw
VAV Controller with sensors/transmitters 10 VA (400 mA)
BO Load
Relay, Contactor, Solenoid, Incremental Actuator*
Maximum allowable load for any individual binary output
(triac) is 19 VA** (800 mA at 24 VAC)
Minimum required load for each binary output (triac)
used is 1.2 VA (50 mA at 24 VAC)
Note: Relay loads less than 50 mA may cause
triac/relay chattering. If necessary, use a
1000 ohm 2W resistor across the binary output.
AO Load
Actuator
Maximum allowable load for each AO is 10 mA with a
minimum load resistance of 1000 ohm.
Zone Terminal or CBLPRO 1.2 VA (50 mA)
*Actuator VA requirements are found in Table 5.
**With total controller power draw limited as described previously.
Refer to specific product
documentation.
Refer to Table 5.
26 VAV Controller—Variable Air Volume Controller
Table 5: Actuator VA Requirements
Actuator Type VA Requirements
for 24 VAC Supply
EDA-2040 (ATP-2040)
VA-7150
VA-7200
VA-8020
VA-8050
J Series Electric Zone Valve
M9100-A, M9200-A
M9100-G, M9200-G
VA-7152
VA-7202
VA-8022
VA-8052
Incremental 3 VA
Incremental 2.7 VA
Incremental 5.5 VA
Incremental 4 VA
Incremental 6 VA
On-Off 7 VA
Floating 6.5 VA
Proportional (Voltage or Current) 6.5 VA
Voltage (0 to 10 VDC) 4.7 VA
Voltage (0 to 10 VDC) 7.5 VA
Voltage (0 to 10 VDC) 4 VA
Voltage (0 to 10 VDC) 6 VA
33F34F35FGrounding and
Isolation
VAV100/101
On unit mounted controls, OEMs typically minimize
wiring between digital controls and equipment interface
relays by using one leg of the stepdown transformer
as common.
Isola tio n
Transformer
L
P
ower
Transformer
24/24
N
ZBUS
AREF
24VAC
24VAC
24VAC
24VAC
24VAC
24VAC
24VAC
24VAC
+15VDC
N2+
N2-
See the
below Figure 9
To
Load
CAUTION
Contactor
+15VDC
ZBUS
AREF
N2+
N2-
Isola tio n
Relay
VAV100 / 101
Figure 8: Transformer and Relay Isolation Wiring Diagram for Series
100/101 VAV Controllers
R
visoxfmr
VAV Controller—Variable Air Volume (VAV) Controller 27
All VAV100/101 connections must be isolated from earth ground to protect
the CBLPRO, laptop PC, or other system components from damage. Due
to OEM system designs and/or electrical codes, the VAV may become
earth grounded unless you take isolation measures. Typically, the VAV
box manufacturer supplies a step-down isolation transformer as part of
their mounting service.
!
CAUTION: Potential Equipment Damage and Improper
Functioning. Do not earth ground the 24 VAC high
side of the VAV’s transformer or any of the VAV’s
BO terminals. If you do, the VAV’s N2 Bus
communications will cycle online and offline. You
will also damage all of the interface components that
are connected, including the CBLPRO, laptop PC,
Companion PC, and MM-CVT101.
Depending on the primary voltage of the power transformer and the
prevailing electrical code, the 24 VAC secondary might be earth grounded.
Earth ground on one side of the secondary destroys hardware by creating a
short circuit path through the CBLPRO and laptop PC serial card during a
download. Earth ground on either side of the secondary can disrupt the
isolation required for N2 communication integrity.
N2 Bus Isolation
VAV 100/101
Power
Transformer
Isolation
VAV100/101
Load Isolation
VAV100/101
36F37F38FVAV110/111 and
VAV140/141
The box manufacturer supplies fan or electric heat relays that might also be
earth grounded. This also disrupts the isolation required for N2
communication integrity.
Note: The Troubleshooting section of this technical bulletin contains a
detailed process that will reduce installation errors by ensuring
proper isolation.
If the secondary of the power transformer is grounded, you must use a
separate 24 VAC to 24 VAC isolation transformer such as the Y65GS
(see Figure 8).
If VAV output loads are grounded, such as a driven contactor or solenoid
coil, you must use a separate isolation relay for each load (see Figure 8).
28 VAV Controller—Variable Air Volume Controller
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