Johnson Controls VMA1200 Series Mounting And Wiring Instruction

Brand: Johnson Controls

Model: VMA1200 Series

Type: Mounting And Wiring Instruction

Technical Bulletin

Issue Date July 1, 2003

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

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

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

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

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:

Isolated Power Supply

Earth Ground Connection

Airflow and High Temperature Safety Switches

Isolated Triacs and Power Wiring for the Airflow and High

Temperature Safety Switches

Isolated LONWORKS Network Bus

Valve Actuators

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

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.

XFR

Synchronous Motor

(Actuator)

COM

Water

Valve

ORKS

Network

Bus

VMA

+15V

+5V

Triacs

COM

OPTO

24 VAC

BCOM

CablePRO or

CVTPRO

Laptop

Reheat

BO-3

Reheat

BO-2

Fan

Relay

BO-1

24 VAC

BI18

AI26

= Optical or

Magnetic

Isolation

0.01 uF

High

Temperature

+15 VDC

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

BI-1 Temp Occ/LED (Light-Emitting Diode)

AI-2 Setpoint

AI-1 Temperature Sensor

AI-1 COM (sensor)

+15 VDC

+15 COM/ZB COM

COM (setpoint)

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

Heating Setpoint or LED and Manual

Override

Not Used

Setpoint (Cooling)

+15 VDC

Temperature Sensor

COM

Temperature Sensor Common

Not Used

+15 VDC

Zone Bus

Power Common or Zone Bus Common

Not Used

Setpoint Common

Zone Bus

Table 3: TE-6700 Room Sensor Terminal Block Wiring Identification

Terminal Signal Destination

Temperature Sensor and Manual Override*

Setpoint Common

Setpoint

+15 VDC

Power Common and Zone Bus Common and Manual Override Common and LED Common*

Zone Bus

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

Not Used

Supply: +15 VDC

AI-1, Zone Temperature Sensor

Supply/Zone Bus Common

AI-1, Sensor Common

Not Used

Supply: +15 VDC

Zone Bus

Supply/Zone Bus Common

Not Used

Zone Bus

Mounting and Wiring VMA1200 Series Controllers Technical Bulletin10

Detailed Procedures

Preparing the VMA for Mounting

To prepare the VMA for mounting:

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

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.

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.

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:

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.

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:

Perform Step 1 as shown previously.

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.

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:

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

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.)

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

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.

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.

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.

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.

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

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:

Disconnect all power to the VMA.

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)

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

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

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

ORKS

Network Layout Technical Bulletin (LIT-1162150).

To connect the LONWORKS Network Bus:

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

Compatible

Device

ON ORKS

SHLD

Shield

LON A

LON B

LON A

LON B

NCMConnect

To Next

Compatible

Device or NCM

ON ORKS

Figure 9: Connecting the VMA to an NCM

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

(Red)

Screw Numbers

Fan

Relay

Coupler

open

3-wire

Baseboard

Heat

open

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

)

To L W

Network Bus

ON ORKS

To Ne xt

Compatible

Device

ON ORKS

Red

LED

Green

LED

SHLD

Description

LED Color

Included on VMA1220 Only

Safety Isolation Transformer in Europe

Earth Ground

COM

CW End Stop

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

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.

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.

Johnson Controls VMA1200 Series Mounting And Wiring Instruction

Johnson Controls VMA1200 Series Mounting And Wiring Instruction

Johnson Controls VMA1200 Series Mounting And Wiring Instruction

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