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Technical Bulletin
Issue Date July 1, 2003
© 2003 Johnson Controls, Inc. www.johnsoncontrols.com
Code No. LIT-1162360 M-Tool Release 5.3
Mounting and Wiring VMA1200 Series Controllers
Mounting and Wiring VMA1200 Series Controllers............................2
Introduction......................................................................................................... 2
Key Concepts...................................................................................................... 3
VMA Position and Orientation ........................................................................................... 3
Determine and Set Damper Polarity ................................................................................. 3
Wiring and Cabling Precautions........................................................................................ 4
VMA Internal Schematic Diagram ..................................................................................... 6
Phone Jack Polarization.................................................................................................... 8
Detailed Procedures......................................................................................... 10
Preparing the VMA for Mounting..................................................................................... 10
Mounting the VMA........................................................................................................... 11
Setting the Damper Position ...........................................................................................12
Wiring the VMA ...............................................................................................................14
Connecting the L
ON
W
ORKS
Network Bus........................................................................ 15
Mounting and Wiring VMA1200 Series Controllers Technical Bulletin2
Mounting and Wiring VMA1200
Series Controllers
Introduction
The integrated Variable Air Volume Modular Assembly (VMA),
which is a controller/actuator/pressure sensor, mounts on the Variable
Air Volume (VAV) terminal box and fastens to the damper shaft.
Instructions for wiring the VMA and its accessory devices are also
provided in this document.
This document describes how to:
•
prepare the VMA for mounting
•
mount the VMA
•
set the damper position
•
wire the VMA
•
connect the L
ON
W
ORKS
® Network Bus
Mounting and Wiring VMA1200 Series Controllers Technical Bulletin 3
Key Concepts
VMA Position and Orientation
Note: Extra mounting brackets, linkage, or couplers are not
required for standard mounting.
Consider the following when positioning and orienting the VMA:
•
Mount the VMA on a vertical and flat surface where it functions
best, such as the side of the VAV box.
•
Route the tubing so a portion of it is lower than the pressure sensor
or loop the tubing. This creates a moisture trap that prevents any
condensation from entering the sensor.
•
Do not make any sharp bends in the tubing. This could collapse the
tube and block the pressure path.
•
Ensure that wiring terminals and service pin are accessible.
•
Make sure the VMA1200 Installation Bulletin (Part No. 24-9310-5)
is available for properly identifying terminals.
•
Locate the VMA so that it has adequate clearance for future
servicing and is protected from moisture and corrosive fumes.
Determine and Set Damper Polarity
Damper polarity is established upon installation. Incorrect damper
positions in a zone easily result in misdiagnosis of readings, resulting
in unnecessary repetition of setup and diagnostics.
Many dampers seal properly only when closed in the rotation direction
specified by the manufacturer. To simplify maintenance, use the same
direction to close on all boxes of the same type.
To determine whether the damper is closed Clockwise (CW) or
Counterclockwise (CCW):
● Visually verify which direction opens the damper before duct work
is completed and note the information for future reference.
● Look up the manufacturer’s damper model specifications.
● Once there is airflow in the zone, use a commissioning tool to
command the actuator to 100%. If this causes the flow to decrease,
it is an indication that the Damper Polarity configuration property
must be reversed from its current setting.
Mounting and Wiring VMA1200 Series Controllers Technical Bulletin4
● To change the damper polarity, set the Damper Polarity
configuration property to Reverse, using a Palm™ compatible
handheld device (Version 2.0 or higher operating system) with the
VMA1200 Balancing Tool (VBT) software, the Comm Pro
commissioning tool, or a L
ON
W
ORKS
Network Services (LNS™)
network management tool.
Note: The default setting for damper polarity is set to normal,
which rotates the damper CCW to close. If it closes in a CW direction,
the damper polarity must be changed.
Wiring and Cabling Precautions
!
WARNING: Risk of Electrical Shock.
Disconnect each of multiple power supplies before making electrical
connections. More than one disconnect may be required to completely
de-energize equipment. Contact with components carrying hazardous
voltage can cause electrical shock and may result in severe personal injury
or death.
IMPORTANT: Disconnect all power supplies, as shorting of binary outputs
while energized destroys the VMA triac.
Read these precautions before touching the terminals or wiring the
VMA and its accessories:
•
Make all wiring connections in accordance with the National
Electrical Code (NEC) and state and local regulations. For
transformer primaries above 150 VAC, the secondary must be
earth grounded at the transformer to meet NEC. You can use
Terminal 1 as the earth ground.
Notes: 24 VAC to 24 VAC isolation transformers are not necessary.
The power supply is internally isolated. See VMA Internal Schematic
Diagram in this section.
For specific methods for wiring the VMA to meet
Underwriters Laboratories®, Inc. (UL) 864 requirements, refer to the
Metasys® Smoke Control Wiring Technical Bulletin (LIT-636331).
•
Locate equipment and route the wiring so that sensor signal wiring
is separated from power wiring by at least 150 mm (6 in.).
•
Make all wiring connections to the VMA using only copper
conductors. To establish tight, reliable electrical connections, use
the correct wire sizes for the terminals. Avoid very thin wire, such
as 26 AWG (less than 0.6 mm solid), which tends to break.
•
Follow LONWORKS Network Bus installation rules for either the
Bus topology or Free topology bus types.
Mounting and Wiring VMA1200 Series Controllers Technical Bulletin 5
•
Do not run L
ON
W
ORKS
Network Bus, Zone Bus,
Analog Input (AI), Binary Input (BI), Analog Output (AO), 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.
•
Run Zone Bus, AI, AO, and BI wiring in the same bundle or
conduit where convenient. If the BO wiring is not wired through
other switches or contacts, such as actuator end-of-travel switches,
you may also bundle it with the other I/O (Input/Output) wiring
where convenient.
The following are additional general wiring considerations:
•
The VMA includes an isolated LONWORKS Network Bus, isolated
binary outputs, and isolated 24 VAC. See VMA Internal Schematic
Diagram in this section.
•
The 24 VAC power input is internally transformer isolated by the
VMA. To meet NEC requirements for line voltage greater than
150 VAC, Terminal 1 (24 VAC) can be earth grounded.
•
Up to 14 cooling-only VMAs (Model VMA1210) are powered
from one 100 VA low voltage power limited, Class 2 transformer.
The number of VMA1220s per transformer varies, depending on
power requirements of the valve actuators and relays. Conduit is
not needed for 24 VAC at 100 VA or less.
•
Large insulated spade lugs with a polarizing tab (for high voltage)
do not fit on the VMA.
Mounting and Wiring VMA1200 Series Controllers Technical Bulletin6
VMA Internal Schematic Diagram
Figure 1 is a key diagram showing the different regions of the larger
schematic diagram in Figure 2. This detailed diagram displays the
following elements as shown in the key diagram below:
1.
Isolated Power Supply
2.
Earth Ground Connection
3.
Airflow and High Temperature Safety Switches
4.
Isolated Triacs and Power Wiring for the Airflow and High
Temperature Safety Switches
5.
Isolated LONWORKS Network Bus
6.
Valve Actuators
7.
Zone Bus
1. Isolated Power Supply
2. Earth Ground Connection
3. Airflow and
High Temperature
Safety Switches
4. Isolated Triacs
and Power Wiring
6. Valve Actuators
7. Zone Bus
vma_small
5. Isolated
Network Bus
LW
ON ORKS
Figure 1: Key to Internal Schematic Diagram (Figure 2)
Mounting and Wiring VMA1200 Series Controllers Technical Bulletin 7
vma_large
Primary
Manual
Reset
AFS
Earth ground is required
by NEC if primary is
greater than 150 VAC.
1
2
XFR
Synchronous Motor
(Actuator)
COM
Water
Valve
1
2
4
3
In
L
ON
W
ORKS
Network
Bus
VMA
+15V
+5V
Triacs
COM
COM
AO
15
23
14
OPTO
24 VAC
BCOM
CablePRO or
CVTPRO
Laptop
R
R
Reheat
BO-3
Reheat
BO-2
Fan
Relay
BO-1
24 VAC
4
6
8
BI18
AI26
5
= Optical or
Magnetic
Isolation
3
0.01 uF
High
Temperature
+15 VDC
AO
uP
R
Figure 2: VMA Internal Schematic Diagram
Mounting and Wiring VMA1200 Series Controllers Technical Bulletin8
Phone Jack Polarization
The figure below illustrates the polarization of the 6-pin and 8-pin
phone jacks on the VMA or room sensor. Pin 1 is to the extreme left as
you face the jack opening, tab notch down.
If you need to create your own cable, refer to Fabricating Your Own
Interconnection Cable in Appendix A: Reference Information located
in the Variable Air Volume Modular Assembly (VMA) 1200 Series
Overview and Engineering Guidelines Technical Bulletin
(LIT-1162350).
8-pin 6-pin
VMA
Room Sensor
Pin 1
phonejack
Figure 3: Phone Jack Polarization
Table 1: VMA Phone Jack Pinouts
Pin Signal
1
BI-1 Temp Occ/LED (Light-Emitting Diode)
2
AI-2 Setpoint
3
AI-1 Temperature Sensor
4
AI-1 COM (sensor)
5
+15 VDC
6
+15 COM/ZB COM
7
COM (setpoint)
8
ZB
Mounting and Wiring VMA1200 Series Controllers Technical Bulletin 9
Table 2: TE-6700 Phone Jack Pinouts
8-Pin Jack 6-Pin Jack
Pin Signal Pin Signal
1
Heating Setpoint or LED and Manual
Override
1
Not Used
2
Setpoint (Cooling)
2
+15 VDC
3
Temperature Sensor
3
COM
4
Temperature Sensor Common
4
Not Used
5
+15 VDC
5
Zone Bus
6
Power Common or Zone Bus Common
6
Not Used
7
Setpoint Common
8
Zone Bus
Table 3: TE-6700 Room Sensor Terminal Block Wiring Identification
Terminal Signal Destination
1
2
Temperature Sensor and Manual Override*
3
Setpoint Common
4
Setpoint
5
+15 VDC
6
Power Common and Zone Bus Common and Manual Override Common and LED Common*
7
Zone Bus
8
LED and Manual Override*
* Manual Override for Temporary Occupied Mode is selected using DIP switches for either Terminals 1 and
2 or 6 and 8 with LED. For more information, see the TE-6700 Series 2nd Generation Temperature Elements
Installation Bulletin (LIT-216332).
Note: A dual setpoint is not available with terminal block versions of the TE-6700.
Table 4: TMZ Phone Jack Pinouts
8-Pin Phone Jack on VMA 6-Pin Phone Jack on TMZ
Pin Signal Pin Signal
1
Not Used
1
Not Used
2
Not Used
2
Supply: +15 VDC
3
AI-1, Zone Temperature Sensor
3
Supply/Zone Bus Common
4
AI-1, Sensor Common
4
Not Used
5
Supply: +15 VDC
5
Zone Bus
6
Supply/Zone Bus Common
6
Not Used
7
Not Used
8
Zone Bus
Mounting and Wiring VMA1200 Series Controllers Technical Bulletin10
Detailed Procedures
Preparing the VMA for Mounting
To prepare the VMA for mounting:
1.
Check that you have the following equipment:
•
VMA
•
TE-6700, TE-7000 (Europe only), or the TMZ1600 room
sensor
•
room sensor cable or wire for connecting the room sensor to
the VMA
2.
Check that you have the following tools:
•
8 mm (5/16 in.) square wrench or 10 mm (3/8 in.) 12 point
socket for actuator collar screw
•
pliers to turn the damper shaft (if needed)
•
8 mm (5/16 in.) hex nut driver or 4 in. extension for 5/16 in.
socket and power screwdriver for self-drilling screw
•
3.5 mm (9/64 in.) drill bit (optional)
Note: The VMA requires a damper shaft protrusion of at least
44 mm (1-3/4 in.) from the VMA mounting surface.
3.
Ensure the VMA installation site meets the following
environmental requirements:
•
The VMA location is protected from direct contact with water
caused by leaking pipes, condensation, or solder from sweating
reheat pipes.
•
The atmosphere is free of explosive vapors or escaping gases.
•
The atmosphere is free of exposure to corrosive chemical or
salt vapors, which might damage electrical equipment.
•
The temperature is maintained between 0 to 50°C
(32 to 122°F), with the relative humidity (non-condensing)
maintained between 10 and 90%. These are operating limits.
Flow measurement accuracy suffers if the ambient temperature
varies widely within this band.
4.
Make sure the VMA mounting location has adequate clearance for
future servicing.
Mounting and Wiring VMA1200 Series Controllers Technical Bulletin 11
Mounting the VMA
To mount the VMA:
1.
Place the VMA in the desired mounting position on the damper
shaft so the wiring terminals are easily accessible.
To allow space for VMA movement during damper rotation,
locate the shoulder washer at the center of the slot.
Make sure the VMA is parallel and mounted flat with the VAV
box. If needed, use a spacer to offset tipping of the VMA created
by shaft bushings that protrude beyond the box surface.
2.
Secure the self-drilling No. 10 screw provided into the VMA
mounting slot, using a power screwdriver and socket with 4 in.
extension.
Alternate mounting:
1.
Perform Step 1 as shown previously.
2.
Use a punch to mark the position of the shoulder washer, then
drill a hole into the VAV box through the mark using a 3.5 mm
(9/64 in.) bit.
3.
Position the VMA so the shoulder washer is over the hole; insert
the mounting screw and tighten against the washer.
Note: The mounting screw is threaded into sheet metal and the
threads can strip. Do not overtighten. Make sure the screw does not
interfere with full damper rotation.
Shoulder
Washer
Mounting
Screw
Mounting Slot
Mount
Bar Code
(Neuron ID)
Phone Jack
(for Sensor)
Service Pin
(Broadcasts
Neuron ID)
Figure 4: Mounting Screw with Shoulder Washer
Mounting and Wiring VMA1200 Series Controllers Technical Bulletin12
Setting the Damper Position
To set the damper position:
1.
Locate the damper position. The following figure shows
three possible icons on the end of the damper shaft.
damposit
Figure 5: Typical Damper Shaft End Icons
2.
Grasp the damper shaft firmly with a pliers and manually position
it to fully closed (icon perpendicular to airflow) for 90° boxes.
(Use the fully open position for 45° or 60° boxes.)
3.
For 90° boxes, push the VMA gear release lever down and
position the actuator collar against its internal stop corresponding
to the fully closed position. This provides a hard stop for this
position. The hard stop for the open position is provided by the
VMA.
For 45° and 60° boxes, push the VMA gear release down and
position the actuator to the fully open damper position. By
installing the VMA at the fully open position, the VMA provides
the open stop for 45° and 60° boxes. The closed damper seal
provides the fully closed stop.
Gear Release
Lever
Damper shaft is in
fully closed position.
Set Screw
Collar is rotated to its
fully closed position.
(CW to close in this example.)
Endstop
LON A
LON B
SHLD
Figure 6: Positioning the End Stop
Mounting and Wiring VMA1200 Series Controllers Technical Bulletin 13
4.
Tighten the set screw to the shaft using a 8 mm (5/16 in.) wrench
or 10 mm (3/8 in.) 12 point socket wrench. Tighten to
17 to 21 N⋅m (150 to 180 lb⋅in [14 lb⋅ft]).
Default configuration for the VMA is 90° rotation in 90 seconds.
Adjust the Damper Time configuration property for 45 seconds
when using a 45° box.
5.
Push the gear release lever down, and turn the VMA coupler by
hand to ensure that the damper can rotate from full closed to full
open positions without binding.
6.
Plug or seal the end of a hollow damper shaft to stop cold duct air
from affecting the circuitry when the VMA is mounted in another
enclosure.
7.
Attach the pneumatic tubing to the pressure sensor with the
HI (red) tubing connected to the inlet or high pressure side, and
clear tubing connected to the low pressure side.
8.
Route the tubing as shown below, or tape a loop in the tubing.
This provides a low spot for collecting condensation.
Low Spot for
Collecting Condensation
Stdmount
Figure 7: Standard Mounting
Mounting and Wiring VMA1200 Series Controllers Technical Bulletin14
Wiring the VMA
All field wiring, with the exception of the L
ON
W
ORKS
Network Bus,
must be kept in the same room with the controllers, to comply with
UL smoke control requirements. Refer to the Metasys Smoke Control
Wiring Technical Bulletin (LIT-636331) for details on smoke control
requirements.
Refer to the project engineering drawings for wiring details.
To wire the VMA:
1.
Disconnect all power to the VMA.
2.
Determine if spade lugs or removable 2- or 3- position screw
terminals or phone cable is to be used. See the Variable Air
Volume Modular Assembly (VMA) 1200 Series Overview and
Engineering Guidelines Technical Bulletin (LIT-1162350) for
screw terminal kit order number.
2-position Removable Screw Terminal Connector
Snapons
Figure 8: Optional Removable Screw Terminals, 2- or 3-position
(Accessory)
3.
Terminate wiring per engineering drawings.
Table 5: Terminations for Cooling Only Applications (VMA1210)
Name Description
AI-1 *
Zone temperature
AI-2 *
Zone setpoint
BI-1 *
Temporary occupied (TE-6700 and TE-7000 [Europe only])
BI-2
Comfort (occupied)
BI-3
Window, off (shutdown)
Zone Bus *
Local communication bus
* Connected through an 8-pin phone cable from the room sensor.
Mounting and Wiring VMA1200 Series Controllers Technical Bulletin 15
Table 6: Terminations for Cooling with Reheat Applications (VMA1220)
Name Description
AI-1 *
Zone temperature
AI-2 *
Zone setpoint
AI-3
Humidity transmitter, sideloop, or CO
2
AI-4
Discharge air temperature
AO-1
Primary or Secondary proportional heat
BI-1 *
Temporary occupied (TE-6700)
BI-2
Comfort (occupied) or occupancy sensor
BI-3
Window, off (shutdown)
BO-1, BO-2, BO-3,
BO-4, and BO-5
Fan, primary heat, secondary heat, humidity
Zone Bus*
Local communication bus
* Connected through an 8-pin phone cable from the room sensor
Note: AI-5 (velocity pressure) and the damper actuator motor are
not listed in either of the above tables because they are internal and no
wiring is required.
Connecting the L
ON
W
ORKS
Network Bus
A connection between the VMA and the Network Control
Module (NCM) is required if the VMA is to communicate with the
Metasys Network. For more information on LONWORKS Networks, see
the L
ON
W
ORKS
Network Layout Technical Bulletin (LIT-1162150).
To connect the LONWORKS Network Bus:
1.
Connect the LonWorks Network Bus wires to the VMA, and
continue to the next VMA. Repeat this process for each VMA.
Notes: The FTT-10 LONWORKS Network Bus is polarity insensitive.
LON A and LON B terminal connections to the FTT-10 bus may be
swapped between controllers.
A doubly terminated bus gives the greatest wiring distance and
requires two terminators on each FTT-10 segment. Free topology
requires only one terminator.
Contact Johnson Controls® customer service at 1-800-275-5676, for
more information about LONWORKS network needs.
Mounting and Wiring VMA1200 Series Controllers Technical Bulletin16
To N ex t
LW
Compatible
Device
ON ORKS
SHLD
Shield
LON A
LON B
LON A
LON B
NCMConnect
To Next
LW
Compatible
Device or NCM
ON ORKS
Figure 9: Connecting the VMA to an NCM
2.
Apply power. Locate and observe the VMA LEDs. See Tables 7
and 8 for details on the Service and Running LED.
NewLedvm
Green LED (Running)
Red LED (Service
)
Figure 10: VMA LED Indicator Location
Mounting and Wiring VMA1200 Series Controllers Technical Bulletin 17
(18) BI-1
(19) COM
(20) BI-2
(21) COM
(22) BI-3
(23) COM
(24) +15 VDC*
(25) +15 VDC
(26) AI-1
(27) COM
(28) AI-2
(29) COM
(30) AI-3*
(31) COM*
(32) AI-4*
(33) COM*
(34) ZB+
Primary
24 VAC
Class2
Energy Limited
Transformer**
3-wire
Incremental
Valve
Actuator
2-wire Proportional
Valve Actuator
Set Screw
HI
(Red)
Screw Numbers
Fan
Relay
6
5
1
2
4
7
Coupler
open
close
3-wire
Baseboard
Heat
open
close
BCOM
(1) 24 VAC
(2) 24 VAC
(3) Earth Gnd.
(optional)
(4) BO-1*
(5) BCOM*
(6) BO-2*
(7) BCOM*
(8) BO3*
(9) BCOM*
(10) BO-4*
(11) BCOM*
(12) BO-5*
(13) BCOM*
(14) AO-1*
(15) COM*
24-18 AWG
(0.8 mm - 1.5 mm
2
)
To L W
Network Bus
ON ORKS
To Ne xt
Compatible
Device
LW
ON ORKS
LO
Red
LED
Green
LED
SHLD
Description
LED Color
Included on VMA1220 Only
Safety Isolation Transformer in Europe
*
**
Earth Ground
COM
CW End Stop
3
Controller operating properly
The network table is not configured.
Use Comm Pro or a Network
Management tool to configure the
controller.
Response to Wink command from
VBT, Comm Pro, or LNS tool
Controller problem.
Download new firmware.
Application is running normally,
LED blinks at 1 second interval.
Application is not running. Check
the power and download a new
application. Replace the unit if
necessary.
Off
Blinking
3 Blinks
then Off
On
On
Off
Blinking
Red
(Service)
Green
(Running)
Pneumatic Tubing
(differential pressure)
TB2-7
TB2-8
TB1-3
TB1-4
TB1-2
TB2-5
8TB1-1
TE-6700*** TE-7000
(Europe
Only)
(35) COM
TB2-6
120 VAC
-277 VAC
State
CCW
End Stop
*** Preferred DIP Switch
O N
1 2 3
Position for TE-6700
Figure 11: Connections to VMA1200 Series Controllers
Mounting and Wiring VMA1200 Series Controllers Technical Bulletin18
Table 7: Service LED
Color Name State Description
Off Controller is operating properly (lights
momentarily on power up and when service pin
is pressed).
Blinking Unconfigured. Use a network management tool
to configure into a network or download new
firmware.
Red
Service
LED
On Controller problem. Download new firmware.
3 Blinks “Wink” command has been received.
Table 8: Running LED
Color Name State Description
Blinking Application is running normally, LED blinks at
one second interval.
On
Steady
Application is not running. Try the following:
1. Check the power.
2. Download a new application.
If Steps 1 and 2 do not resolve the problem,
replace the VMA controller.
Green
Running
LED
Off
Steady
Application is not running. Try the following:
1. Check the power.
2. Download a new application.
If Steps 1 and 2 do not resolve the problem,
replace the VMA controller.
Controls Group
507 E. Michigan Street
P.O. Box 423 www.johnsoncontrols.com
Milwaukee, WI 53201 Published in U.S.A.
/