Johnson Controls VMA1615, VMA1626, VMA1628, VMA1630 Installation Manual

VMA1615/1626/1628/1630 VAV Controllers

Applications

The VMA1615/1626/1628/1630 programmable digital controllers are designed for Variable Air Volume (VAV) applications that communicate through the BACnet® MS/TP or N2 protocol. These Variable Air Volume Modular Assembly (VMA) controllers feature combinations of an integral digital pressure sensor (DPT), a damper actuator, and a 32-bit microprocessor. The VMA1626 has an actuator but does not contain a DPT. The VMA1628 model has a DPT but does not contain an actuator. The controllers' small package size facilitates quick field installation and efficient use of space without compromising high-tech control performance. These VMA controllers connect easily to the wired and wireless network sensors for zone and discharge air temperature sensing.

Switchable Communications protocols

Installation Guide

Part No. 24-10143-217 Rev. K

2019-10-18

• must be programmed with CCT, which has similar, but not identical programming capabilities as HVACPro, GX9100, GPL, and other legacy tools

• support SA Bus devices

• support WRZ wireless sensors from the controller using the WRZ-7860 receiver (most models)

• are available in Buy American versions (most models)

The N2-capable FEC family controllers:

• do not support Zone Bus (for example, TMZ sensors and M100 actuators) or XT-Bus (System

91) devices (for example, XT, XTM, and XP modules)

• do not support a wireless connection to the N2 bus

• do not support NxE passthrough

The Metasys® system Field Equipment Controller (FEC) family controllers and network sensors communicate using the standard BACnet® protocol, based on the ANSI/ASHRAE 135-2008. The BACnet protocol is a standard for ANSI, ASHRAE, and the International Standards Organization (ISO) for building controls.

VMA16, VMA18 controllers are BTL-listed as BACnet Application Specific Controllers (B-ASCs).

The Controller Configuration Tool (CCT) can be used to switch the Field Bus communications protocol in supported FEC, FAC, and VMA controllers to be either the standard BACnet MS/TP or the N2 protocol. All new controllers use either BACnet MS/TP as the default communications protocol, or BACnet/IP. Switchable communications protocols in the MS/ TP models provide a cost-effective upgrade and modernization path for customers with existing N2 controllers.

The N2-capable FEC Family Controllers can be used as functional replacements for legacy N2 controllers. The N2-capable FEC Family Controllers:

• have the input and output (I/O) quantities and characteristics of the FEC Family Controllers

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.

*2410143217K*

(barcode for factory use only)

MS-VMA1615,MS-VMA1626,MS-VMA

1628,MS-VMA1630

Installation

Observe the following guidelines when installing a VMA1615/1626/1628/1630 controller:

• Transport the controller in the original container to minimize vibration and shock damage to the controller.

• Do not drop the controller or subject it to physical shock.

• 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

Parts included

• One VMA1615/1626/1628/1630 controller with removable SA bus and power terminal blocks

• One installation instructions sheet

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

• The VMA1628 model includes a 1.25 inch extended length screw.

Materials and special tools needed

• Several 6 mm (1/4 in.) female spade terminals for input and output wiring, and crimping tool for spade mounted terminal blocks

• Pliers to open and close the damper

• Required length of 3.97 mm (5/32 in.) ID pneumatic tubing and barbed fittings

Physical features

The following figure displays the physical features of a VMA, and the accompanying table provides a description of the physical features and a reference to further information where required.

VMA1615/1626/1628/1630 VAV Controllers Installation Guide2

Figure 1: VMA1615/1626/1628/1630 Controller wiring terminations and physical features (VMA1630-1 Model shown)

Table 1: VMA1615/1626/1628/1630 Feature Callout Numbers and Descriptions

Physical Features: Description and References

5 Dual Port Fitting (see Figure 1)

24 VAC, Class 2 Supply Power Terminal Block (see Supply

power terminal block)

Device Address DIP Switch Block (see Setting the device

address)

Binary Outputs, 24 VAC Triacs (see Communication bus

and supply power table)

Configurable Outputs: Voltage Analog Output (0–10 VDC) and Binary Output (24 VAC Triac) (VMA1630, 1626, and 1628 only) (see Communication bus and supply power table)

Manual Override Button (see Mounting for information on using manual override Button)

Controller Coupler (see Mounting for information on using the controller coupler)

Coupler Bolt (see Mounting for information on setting the coupler bolt)

Table 1: VMA1615/1626/1628/1630 Feature Callout Numbers and Descriptions

Physical Features: Description and References

Universal Input: Voltage Analog Input (0–10 VDC) Resistive Analog Inputs (0–600k ohm) 0–2k Potentiometer

11 EOL (End-of-Line) Switch (see Setting the EOL switch) 12 SA Bus Terminal Block

15 Captive Spacer and Screw (see Figure 1) 16 LED Status Indicators (see Table 8)

RTD: 1k Nickel, 1k Platinum, or A99B SI NTC: 10K Type L (10K Johnson Controls Type II is

equivalent to Type L) or 2.252K Type II Dry Contact Binary Input

FC Bus Terminal Block. May also be used for N2 connections. (see FC bus terminal block (Or N2 protocol

as required))

Modular Port (FC Bus) RJ-12 6-Pin Modular Jack (see

Modular ports)

Modular Port (SA Bus) RJ-12 6-Pin Modular Jack (see

Modular ports)

VMA1615/1626/1628/1630 VAV Controllers Installation Guide 3

Mounting

Observe the following guidelines when mounting a VMA:

Note: 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

• Ensure that the mounting surface can support the controller and any user-supplied enclosure. electronics. Mount the controller vertically above the damper shaft to allow any shaft condensation to fall away from the controller. Additional measures may be required in some installations.

• Mount the controller on a hard, even surface whenever possible.

• Use shims or washers to mount the controller securely and evenly on the mounting surface.

• Mount the controller in an area free of corrosive vapors that matches the ambient conditions specified in the Technical specifications section.

• Provide sufficient space around the controller for cable and wire connections and adequate ventilation through the controller (at least 50 mm [2 in.] on the top, bottom, sides, and front of the controllers).

• electronics. Mount the controller vertically above the damper shaft to allow anyDo not mount the controller in areas where electromagnetic emissions from other devices or wiring can interfere with controller communication.

• Avoid mounting the controller on surfaces with excessive vibration.

• When using the VMA1615/1626/1628/1630 to replace a VMA1610 or VMA1620 controller, plug the unused open hole in the duct work from the original VMA mounting if possible. Plug the hole using the sheet metal screw from the original installation (preferred option).

On panel or enclosure mount applications, observe these additional guidelines:

• Do not install the controller in an airtight enclosure.

• Mount the controller so that the power transformer and other devices do not radiate excessive heat to the controller.

To mount the controllers, complete the following steps:

1. Set all the switches on the field controller to their known settings.

2. Place the controller in the proper mounting position on the damper shaft so that the wiring connections are easily accessible. Make sure the controller base is parallel to the VAV box (perpendicular to the damper shaft). If needed, use a spacer to offset tipping of the controller caused by the shaft bushings.

Note: Use the alignment marks to center the captive spacer to ensure sufficient movement in either direction.

3. Secure the self-drilling No. 10 screw through the captive spacer (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 spacer. For the VMA1628 models, use the additional 1.25 inch screw to mount to one of the two holes provided near the actuator opening (see Figure 1) to mount the controller.

Important: Do not overtighten the screw, or the threads may strip. If mounting to the VAV box, make sure the screws do not interfere with damper blade movement.

4. Locate the damper position using the typical marking on the end of the damper shaft as shown in the following figure.

Figure 2: Typical Damper End Shaft Icons

• Mount the controller so that the enclosure walls do not obstruct cover removal or ventilation through the controller.

VMA1615/1626/1628/1630 VAV Controllers Installation Guide4

5. 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.

6. Push down and hold the Manual Override button (see Physical features) and turn the controller coupler until it contacts the mechanical end-stop at either the full-closed (90° boxes) or full-open (45° and 60° boxes) position.

7. 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 full-closed and full-open damper positions. By installing the controller at the full-open position, the controller provides the open stop for 45° and 60° boxes. The closed damper seal provides the full-closed stop.

Note: 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 (for 90° VAV boxes). For 45° and 60° VAV boxes, the actuator stroke time must be adjusted. Refer to Controller Tool Help (LIT-12011147) for instructions on setting the actuator stroke time in the application.

8. All models are compact in size and can be easily installed on VAV boxes. The models have either a round shaft up to 13 mm in diameter or a 10 mm square shaft. 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).

9. (Skip this step if you are installing the VMA1626 model) Loop the pneumatic tubing (supplied by field personnel) to include a trap for condensation. Attach the needed length of tubing (supplied and installed by field personnel) to the dual port fitting on the controller and the other ends of the tubing to the pressure transducer in the VAV box application.

Note: The controller uses a digital nonflow pressure sensor (all models except the VMA1626) with bidirectional flow operation. You can connect the highand low-pressure DP tubes to either barbed fitting on the 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 controller.

10. Push the Manual Override button, and turn the actuator coupling manually to ensure that the actuator can rotate from full-closed to full-open positions without binding.

11. 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

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 démarrage de l'unité de traitement d'air.

VMA1615/1626/1628/1630 VAV Controllers Installation Guide 5

Wiring

CAUTION

Risk of Electric Shock

Disconnect the power supply before making electrical connections to avoid electric shock.

ATTENTION

Risque de décharge électrique

Débrancher l'alimentation avant de réaliser tout raccordement électrique afin d'éviter tout risque de décharge électrique.

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.

Input and Output terminals

The input spade terminals are located on the bottom of the VMA near the FC Bus terminal block. The output spade terminals are located on the top of the controller near the power supply . For more information, see Table .

FC bus terminal block (Or N2 protocol as required)

The FC Bus terminal block is a blue, removable, 4terminal plug that fits into a board-mounted jack.

Wire the removable FC Bus terminal block plugs on the VMA and other controllers in a daisy-chain configuration using 3-wire twisted, shielded cable as shown in Figure 3. See Communication bus and

supply power table for more information.

Figure 3: FC bus terminal block wiring

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.

For information on configuring and wiring a BACnet/IP network, refer to the Metasys IP

Networks for BACnet/IP Controllers Configuration Guide (LIT-12012458). For detailed information on configuring and wiring a SA Bus, refer to the MS/TP Communications Bus Technical Bulletin (LIT-12011034).

VMA terminals and bus ports

Note: The Shield terminal (SHLD) on the FC Bus terminal block is isolated and can be used to connect the cable shields on the bus (Figure

3).

SA Bus terminal block

The SA Bus terminal block is a brown, removable, 4-terminal plug with +15 VDC that fits into a boardmounted jack. Wire the removable SA Bus terminal block plugs on the VMA and other SA Bus devices in a daisy-chain configuration using 4-wire twisted, shielded cable as shown in Figure 4. See Table for more information.

See for input and output terminal and bus port locations on the controllers. Observe the following guidelines when wiring a VMA controller.

VMA1615/1626/1628/1630 VAV Controllers Installation Guide6

Figure 4: SA bus terminal block wiring

Modular ports

The modular and FC Bus ports on the face of the VMA are RJ-12 (6-position) modular jacks as shown in Figure 5.

Figure 5: Pin Number Assignments for Sensor (SA Bus and FC Bus) Ports on VMA1615/1626/1628/1630 Controllers

Wire the 24 VAC supply power wires from the transformer to the HOT and COM terminals on the terminal plug as shown in the following figure. See Table for more information.

Figure 6: 24 VAC supply power terminal block wiring

Important: Exercise caution while rewiring

the power plug when replacing a VMA1610 or VMA1620 controller with a VMA1615 or VMA1630 controller. The supply power terminal on a new VMA is a two-position terminal block (Figure 6). A VMA1610 or VMA1620 controller uses a three-position terminal block, and the center position is not used. Stray wire strands may make contact and cause a short circuit across the 24 VAC power supply.

The modular SA Bus port provides a connection for the Wireless Commissioning Converter (BTCVT), VAV Balancing Tool, DIS1710 Local Controller Display, WRZ78xx Series One-to-One Wireless Transmitter, and NS Series sensors. The modular FC Bus port provides a connection for the Wireless Commissioning Converter and the ZFR/ZFR Pro Wireless Router.

Note: Do not use the modular SA Bus port and the terminal block SA Bus simultaneously. Only use one of these connections at a time.

Supply power terminal block

The 24 VAC supply power terminal block is a gray, removable, 2-terminal plug that fits into a board-mounted jack on the upper left of the VMA 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 controller 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 controller 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. See the following figure.

VMA1615/1626/1628/1630 VAV Controllers Installation Guide 7

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