Johnson Controls VMA18 Series User manual

VMA1826/1832 VAV Controller Installation Guide

Applications

The VMA18 Series programmable VAV box

controllers are intended for use as functional

replacements for the VMA1410, VMA1415, VMA1420,

and the VMA1440 controllers.

VMA1826 controllers are well-suited for commercial

zoning applications and can be used for pressure

dependent VAV box applications where no

differential pressure tranduser (DPT) is required.

Note: At Controller Configuration Tool (CCT)

13.0 or later, using Release Mode 10.1, VMA18

Series controllers can be configured as either

N2 devices or as standard BACnet® MS/TP

devices. This ability provides a potential cost-

effective protocol upgrade path for existing

customers and should be considered when you

install the controller.

Important: When you receive a VMA18 Series

controller from the factory or upgrade the

firmware or main code, the controller defaults

to using the MS/TP communications protocol.

The Load Summary screen of CCT shows the

connection as Wired Field Bus, indicating that

the MS/TP protocol is in use. If you have an N2

application, the Load Summary screen indicates

that you need to switch the communications

protocol to N2.

These VMA controllers feature an integral digital

pressure sensor, a damper actuator, and a 32-bit

microprocessor. The controller's small package size

facilitates quick field installation and efficient use

of space for field replacements, while still enabling

precision control performance.

Note: Connecting an IOM to the VMA via the SA

Bus connection is not supported.

For information about sensor compatibility and

replacement, see Sensor replacement and reuse

scenarios.

North American emissions

compliance

United States

This equipment has been tested and found to

comply with the limits for a Class A digital device

pursuant to Part 15 of the FCC Rules. These limits

are designed to provide reasonable protection

against harmful interference when this equipment

is operated in a commercial environment. This

equipment generates, uses, and can radiate radio

frequency energy and, if not installed and used in

accordance with the instruction manual, may cause

harmful interference to radio communications.

Operation of this equipment in a residential area

may cause harmful interference, in which case the

users will be required to correct the interference at

their own expense.

Canada

This Class (A) digital apparatus meets all the

requirements of the Canadian Interference-Causing

Equipment Regulations.

Cet appareil numérique de la Classe (A) respecte

toutes les exigences du Règlement sur le matériel

brouilleur du Canada.

Installation

Observe these guidelines when installing a VMA18

Series controller:

• Transport the VMA controller in the original

container to minimize vibration and shock

damage to the VMA controller.

• Do not drop the VMA controller or subject it to

physical shock.

Parts included

• One VMA18 Series controller with removable N2/

FC bus terminal block

• One installation instructions sheet

• Two 6.35 mm x 6.35 mm (1/4 in. x 1/4 in. ) brass

fittings

*2410143373K*

Part No. 24-10143-373 Rev. K

2019-10-18

(barcode for factory use only)

MS-VMA1826-x, MS-VMA1832-x

• One self-drilling No. 10 x 25 mm (1 in.) screw

• Two 12-in. (30.48 cm.) pieces of flexible tubing

• One controller/sensor Y cable adapter

• One 8-pin to 6-pin single-socket cable adapter

Note: Remove the cap plug from the TSTAT port

of the controller and save for future use. The

cap plug is used on existing sensor ports that

are no longer used.

Materials and special tools needed

Note: You may not require all the materials

listed for your controller installation.

• Several 6 mm (1/4 in.) female spade terminals

for input and output wiring and crimping tool or

spade mounted terminal blocks

• Small straight-blade screwdriver for securing

wires in the terminal blocks

• 8 mm (5/16 in.) wrench or 10 mm (3/8 in.) 12-point

socket to tighten the square coupler bolt

• Several shims or washers to mount the VMA

• Power screwdriver, 100 mm (4 in.) extension

socket, punch, drill, and 3.5 mm (9/64 in.) drill bits

to mount the VMA

• Pliers to open and close the damper

• Required length of 3.97 mm (5/32 in.) ID

pneumatic tubing and barbed fittings

Physical features

Figure 1: VMA18 Series Controller Wiring Terminations and Physical Features

Table 1: VMA18 Series Controller feature callout numbers and descriptions

Physical features: description and references

1 24 VAC, Class 2 Supply Power Spade Terminals (see Supply power spade terminals)

2 Device Address DIP Switch Block (see Setting the device address)

VMA1826/1832 VAV Controller Installation Guide2

Table 1: VMA18 Series Controller feature callout numbers and descriptions

Physical features: description and references

3 Binary Outputs, 24 VAC Triacs (see Table 4)

4 Configurable Outputs: Voltage Analog Output (0–10 VDC) and Binary Output (24 VAC Triac) (see Table 4)

5Dual Port Fitting (see Figure 1)

Not included in the VMA1826 model.

6 Manual Override Switch (see Mounting)

7 Controller Coupler (see Mounting)

8 Coupler Bolt (see Mounting)

Universal Input: Voltage Analog Input (0–10 VDC)

Resistive Analog Inputs (0–600k ohm) (see Table 4):

0–2k Potentiometer

RTD: 1k Nickel, 1k Platinum, or A99B SI

NTC: 10K Type L (10K JCI Type II is equivalent to Type L) or 2.252K Type II

Dry Contact Binary Input

10 N2/FC Bus Pluggable Screw Terminal Block (see N2/FC bus terminal block)

11 EOL (End-of-Line) Switch (see Setting the EOL switch)

12 SA Bus Spade Terminals (see SA bus spade lugs)

13 TSTAT Modular Port: RJ-45 8-Pin Modular Jack (see Modular port)

14 Captive Spacer and Screw (see Figure 1)

15 LED Status Indicators (see Table 8)

Mounting

Observe these guidelines when mounting a VMA:

Important: When the air supply to the VAV

box is below 10°C (50°F), make sure that any

condensation on the VAV box, particularly on

the damper shaft, does not enter the VMA

electronics. Mount the VMA vertically above the

damper shaft to allow any shaft condensation

to fall away from the VMA. Additional measures

may be required in some installations.

• Ensure the mounting surface can support the

VMA and any user-supplied enclosure.

• Mount the VMA on a hard, even surface whenever

possible.

• Use shims or washers to mount the VMA securely

and evenly on the mounting surface.

• Mount the VMA in an area free of corrosive

vapors that matches the ambient conditions

specified in the VMA1832 Technical Specifications

section.

• Provide sufficient space around the VMA for cable

and wire connections and adequate ventilation

through the controller (50 mm [2 in.] minimum

on the top, bottom, sides, and front of the

controllers).

• Do not mount the VMA in areas where

electromagnetic emissions from other

devices or wiring can interfere with controller

communication.

• Avoid mounting the VMA on surfaces with

excessive vibration.

• Because the VMA controller is smaller than the

VMA1410, VMA1415, VMA1420, and the VMA1440

controllers, we recommend plugging the unused

open hole with the screw from the original VMA14

mounting when using the VMA18 to replace a

VMA14 Series controller.

On panel or enclosure mount applications, observe

these additional guidelines:

• Do not install the VMA in an airtight enclosure.

• Mount the VMA so that the enclosure walls do not

obstruct cover removal or ventilation through the

controller.

• Mount the VMA so that the power transformer

and other devices do not radiate excessive heat to

the controller.

VMA1826/1832 VAV Controller Installation Guide 3

To mount the VMA18 Series controller, complete the

following steps:

1. Place the VMA18 Series controller in the proper

mounting position on the damper shaft so that

the wiring connections are easily accessible.

Note: The line from the captive spacer and

screw through the center of the damper

shaft must be either horizontal or vertical,

and the wall plate must be wall-mounted

to comply with UL requirements. See the

following figure for possible mounting

positions.

Figure 2: Possible VMA18 Series Controller

Mounting Positions

Make sure the VMA controller base is parallel

to the VAV box (perpendicular to the damper

shaft). If needed, use a spacer to offset tipping

of the VMA controller caused by the shaft

bushings.

Note: Using the alignment marks to center

the captive spacer ensures sufficient

VMA18 controller movement in either

direction.

2. Secure the self-drilling No. 10 screw through

the shoulder washer (Figure 1) with a power

screwdriver and 100 mm (4 in.) extension

socket. Otherwise, use a punch to mark the

position of the shoulder washer, and then drill a

hole into the VAV box using a 3.5 mm (9/64 in.)

drill bit. Insert the mounting screw and tighten

against the washer.

Note: The mounting screw for the VMA

controller does not use the same hole

as the screw for the VMA1410, VMA1415,

VMA1420, and the VMA1440 controller.

We recommend plugging the unused

open hole with the screw from the original

VMA14 mounting when using the VMA18

to replace a VMA14 Series controller.

Important: Do not overtighten the screws,

or the threads may strip. If mounting to

the VAV box, make sure the screws do not

interfere with damper blade movement.

3. Locate the damper position using the typical

marking on the end of the damper shaft. See

the following figure.

Figure 3: Typical damper end shaft icons

4. Note the direction, clockwise (CW) or

counterclockwise (CCW), required to close the

damper. Grasp the damper shaft firmly with

pliers, and either manually close the damper

(for 90° boxes) or manually open the damper

(for 45° or 60° boxes).

5. Push down and hold the Manual Override

button (Figure 1) and turn the VMA controller

coupler until it contacts the mechanical end-

stop at either the fully closed (90° boxes) or

fully open (45° and 60° boxes) position.

6. If the damper for a 90° box closes CCW, rotate

the coupler to the CCW mechanical limit. If the

damper for a 90° box closes CW, rotate the

coupler to the CW mechanical limit. The open

end-stop is automatically set for 90° boxes. For

45° and 60° boxes, hard stops must be provided

at both fully closed and fully open damper

positions. By installing the VMA controller at the

fully open position, the VMA controller provides

the open stop for 45° and 60° boxes. The closed

damper seal provides the fully closed stop.

Important: The integrated actuator has

a stroke time of 60 seconds for 90° of

travel. The stroke time is the amount of

time (in seconds) that it takes the actuator

to move from the fully closed to fully

opened position or from fully open to fully

closed position. For proper operation, the

actuator stroke time must be configured

in the CCT application based on the actual

time it takes the actuator to drive the

damper. The default setting is 60 seconds

VMA1826/1832 VAV Controller Installation Guide4

(for 90° VAV boxes). For 45° and 60° VAV

boxes, the actuator stroke time must be

adjusted. Refer to the Controller Tool Help

(LIT-12011147) for instructions on setting

the actuator stroke time in the application.

7. Tighten the square coupler bolt to the shaft

using an 8 mm (5/16 in.) wrench or 10 mm (3/8

in.) 12-point socket. Tighten to 10.5 to 11.5 N·m

(95 to 105 lb·in).

8. Loop the pneumatic tubing to include a trap for

condensation. If needed, use the included brass

fittings and attach the included pieces of tubing

to the tubing of the VMA controller. Attach the

tubing from the VMA controller to the dual port

fitting on the VMA controller and the other ends

of the tubing to the pressure transducer in the

VAV box application (Figure 1). The VMA1826

does not come with the tubing pieces.

Note: The VMA uses a digital non-flow

pressure sensor with bidirectional flow

operation, which allows the high- and

low-pressure DP tube connections to

be made to either barbed fitting on the

VMA controller. You do not need to make

a specific high- or low-side connection

when you attach the tubing to the barbed

fittings on the VMA.

9. Push the manual release button, and turn the

actuator coupling manually to ensure that the

actuator can rotate from full-closed to full-open

positions without binding.

10. Complete the mounting by rotating the damper

to the full-open position.

CAUTION

Risk of Property Damage

Rotate the damper to the full-open position before

starting the air handler. Failure to rotate the damper to

the full-open position may result in damage to the VAV

box or ductwork when the air handler is started.

ATTENTION

Mise En Garde: Risque de dégâts matériels

Faire pivoter le registre pour le placer en position

d'ouverture complète avant de démarrer l'unité de

traitement d'air. Le non-respect de cette directive

risque d'endommager le caisson de l'unité à volume

d'air variable (VAV) ou le réseau de conduites au dé-

marrage de l'unité de traitement d'air.

Wiring

WARNING

Risk of Electric Shock

Disconnect the power supply before making electrical

connections to avoid electric shock.

AVERTISSEMENT

Mise En Garde: Risque de décharge électrique:

Débrancher l'alimentation avant de réaliser tout rac-

cordement électrique afin d'éviter tout risque de

décharge

Important: Do not connect supply power

to the controller before finishing wiring and

checking all wiring connections. Short circuits

or improperly connected wires can result

in damage to the controller and void any

warranty.

Important: Do not exceed the controller

electrical ratings. Exceeding controller electrical

ratings can result in permanent damage to the

controller and void any warranty.

Important: Use copper conductors only. Make

all wiring in accordance with local, national, and

regional regulations.

Important: Electrostatic discharge can

damage controller components. Use proper

electrostatic discharge precautions during

installation, setup, and servicing to avoid

damaging the controller.

VMA1826/1832 VAV Controller Installation Guide 5

For detailed information on configuring and wiring

an N2 Bus, refer to the N2 Communications Bus

Technical Bulletin (LIT-636018).

VMA terminals and bus ports

See Figure 1 for input and output terminal and bus

port locations on the VMA18 Series controllers.

Observe the following guidelines when wiring a

VMA18 controller.

Input and Output terminals

The input spade terminals are located on the side

of the VMA near the N2/FC Bus terminal block. The

output spade terminals are located on the opposite

side of the controller near the power supply spade

terminals. See Table 4 for more information.

N2/FC bus terminal block

The N2/FC Bus terminal block is a blue, removable,

4-terminal plug that fits into a board-mounted jack.

Wire the removable N2/FC Bus terminal block plugs

on the VMA and other field controllers in a daisy-

chain configuration using 3-wire twisted, shielded

cable as shown in Figure 4. See Table 5 and Table 6

for more information.

Figure 4: N2/FC bus terminal block wiring

Note: The Shield terminal (SHLD) on the N2/FC

Bus terminal block is isolated and can be used

to connect the cable shields on the bus (Figure

4).

SA bus spade lugs

Wire the SA Bus spade lugs on the VMA and other

SA Bus devices in a daisy-chain configuration using

4-wire twisted, shielded cable as shown in Figure 5.

See Table 6 for more information.

Figure 5: SA bus spade lug wiring

Note: Connecting an IOM to the VMA by using

the SA Bus connection is not supported.

Modular port

The modular (TSTAT) port on the face of the VMA

(Figure 1) is an RJ-45, 8-position modular jack used

to connect your new or existing sensor to the VMA

using one of the two included adapters. Refer to

the Sensor Replacement section in the N2 VMA

Application Note (LIT-12011829).

Figure 6: Pin number assignments for the

modular port on VMA18 Controllers

Supply power spade terminals

Wire the 24 VAC supply power wires from the

transformer to the HOT and COM terminals on the

VMA1826/1832 VAV Controller Installation Guide6

spade terminal as shown in Figure 7. See Table 6 for

more information.

Figure 7: 24 VAC Supply Power Spade Terminal

Wiring

Important:

• The supply power terminal block on the

VMA18 is a two-position spade lug (Figure

7). Exercise caution while rewiring the power

plug when replacing an existing controller.

Stray wire strands may make contact and

cause a short circuit across the 24 VAC power

supply.

• To maintain proper phasing when replacing

the existing VMA14xx controller with the

VMA18 controller, connect the power wire

from 24 VAC: 1 terminal on the existing

controller to the HOT power terminal on

the VMA18. Also connect the power wire

from the 24 VAC: 2 terminal on the existing

controller to the COM power terminal on the

VMA18 controller.

The supply power wire colors may be different on

transformers from other manufacturers. Refer to

the transformer manufacturer’s instructions and

the project installation drawings for wiring details.

Important: Connect 24 VAC supply power to

the VMA and all other network devices so that

transformer phasing is uniform across the

network devices. Powering network devices

with uniform 24 VAC supply power phasing

reduces noise, interference, and ground loop

problems. The VMA does not require an earth

ground connection. However, when grounding

the secondary of the 24 VAC transformer

is required, only one connection to ground

should be made near the transformer.

Figure 8: Transformer Grounding

CAUTION

Risk of Personal Injury and Property Damage

Improper wiring of this terminal may cause a short cir-

cuit across the 24 VAC power supply on -1 models.

ATTENTION

Risque de blessure et dégâts matériels

Improper wiring of this terminal may cause a short cir-

cuit across the 24 VAC power supply on -1 models.

To wire the VMA18 Series controller, complete the

following steps:

1. Terminate wiring per engineering drawings.

2. Wire network sensors and other devices to the

VMA's SA Bus.

3. Wire the N2/FC Bus in a daisy chain (see Table

6).

4. Ensure that the VMA’s device address DIP

switches are set to the appropriate device

address. (See Setting the device address.)

5. Connect the VMA controller to 24 VAC, Class 2

power.

Refer to the N2 VMA Application Note (LIT-12011829)

for more information about replacing an existing

controller with an VMA18 controller.

VMA1826/1832 VAV Controller Installation Guide 7

VMA terminal functions, ratings,

requirements, and wiring guidelines

Input and Output wiring guidelines

Table 4 provides information about the functions,

ratings, and requirements for the VMA input and

output terminals, and Table 5 provides guidelines

for wire sizes and cable lengths.

In addition to the wiring guidelines in Table 4,

observe these guidelines when wiring VMA inputs

and outputs:

• Run all low-voltage wiring and cables separate

from high-voltage wiring.

• All input and output cables, regardless of wire

size or number of wires, should consist of twisted,

insulated, and stranded copper wires.

• Shielded cable is not required for input or output

cables.

• Shielded is recommended for input and output

cables that are exposed to high electromagnetic

or radio frequency noise.

• Cable runs of less than 30 m (100 ft) typically do

not require an offset in the input/output software

setup. Cable runs over 30 m (100 ft) may require

an offset in the input/output software setup.

Maximum cable length versus load

current

Use Figure 13 to estimate the maximum cable

length relative to the wire size and the load current

(in mA) when wiring inputs and outputs.

N2/FC and SA bus and supply power

wiring guidelines

Table 6 provides information about terminal block

functions, ratings, and requirements.

Table 6 also provides wire size, cable type, and

cable length guidelines for wiring the VMA

communication buses and supply power.

In addition to the guidelines in Table 6, observe

these guidelines when wiring the SA and N2/FC

Buses and supply power:

• Run all low-voltage wiring and cables separate

from high-voltage wiring.

• All N2/FC and SA Bus cables, regardless of wire

size, should be twisted, insulated, stranded

copper wire.

• Shielded cable is strongly recommended for all

N2/FC and SA Bus cables.

• Refer to the N2 Communications Bus Technical

Bulletin (LIT-636018) for detailed information

regarding wire size and cable length

requirements for the N2/FC and SA buses.

Termination diagrams

A set of Johnson Controls® termination diagrams

provides details for wiring inputs and outputs to

the VMA18 Series controllers. See the figures in this

section for the applicable termination diagrams.

Table 2: Termination details

Type of field device Type of Input/

Output Termination diagrams

Voltage Input -

External Source UI

VMA1826/1832 VAV Controller Installation Guide8

Table 2: Termination details

Type of field device Type of Input/

Output Termination diagrams

Voltage Input - Internal

Source UI

Voltage Input (Self-

Powered) UI

Temperature Sensor UI

Dry Contact UI

0–10 VDC Output to

Actuator (Internal

Source)

0–10 VDC Output to

Actuator (External

Source)

VMA1826/1832 VAV Controller Installation Guide 9

Table 2: Termination details

Type of field device Type of Input/

Output Termination diagrams

24 VAC Triac Output

(Switch Low, External

Source)

Note: Only applies to CO4 and CO5.

Incremental Control to

Actuator (Switch Low,

External Source)

Note: Applies to CO4 and CO5.

Analog Output

(Voltage) CO

24 VAC Binary Output

(Switch Low, Internally

Sourced)

Note: Applies to BO1, BO2, and BO3.

Incremental Control to

Actuator (Switch Low,

Internally Sourced)

Note: Only applies to BO1, BO2, and BO3.

Temperature Sensor

with Modular Jack SA Bus

Note: The bottom jack (J2) on the TE-700 and TE-6x00 Series Sensors are not usable as a

zone bus or an SAB connection.

VMA1826/1832 VAV Controller Installation Guide10

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