Johnson Controls VMA1200 Series User manual

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 LONWORKS 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 LONWORKS® 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 LONWORKS 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 LONWORKS 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
30.01 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
1BI-1 Temp Occ/LED (Light-Emitting Diode)
2AI-2 Setpoint
3AI-1 Temperature Sensor
4AI-1 COM (sensor)
5+15 VDC
6+15 COM/ZB COM
7COM (setpoint)
8ZB

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
1Heating Setpoint or LED and Manual
Override
1Not Used
2Setpoint (Cooling) 2+15 VDC
3Temperature Sensor 3COM
4Temperature Sensor Common 4Not Used
5+15 VDC 5Zone Bus
6Power Common or Zone Bus Common 6Not Used
7Setpoint Common
8Zone Bus
Table 3: TE-6700 Room Sensor Terminal Block Wiring Identification
Terminal Signal Destination
1
2Temperature Sensor and Manual Override*
3Setpoint Common
4Setpoint
5+15 VDC
6Power Common and Zone Bus Common and Manual Override Common and LED Common*
7Zone Bus
8LED 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
1Not Used 1Not Used
2Not Used 2Supply: +15 VDC
3AI-1, Zone Temperature Sensor 3Supply/Zone Bus Common
4AI-1, Sensor Common 4Not Used
5Supply: +15 VDC 5Zone Bus
6Supply/Zone Bus Common 6Not Used
7Not Used
8Zone 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.