Johnson Controls VMA1200 Series Manuale utente

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 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

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

15 23

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

30.01 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

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

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.

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