Distech Controls ECL-VAVS User manual

ECL-VAVS Controller

Figure1: ECL-VAVS Controller

Product Description

This document describes the hardware installation procedures for the ECL-VAVS Single Duct Variable Air Volume Controllers.

The Distech Controls Variable Air Volume product line is designed to control and monitor various types of HVAC equipment such as baseboards, single

and multi-stage duct heaters, fans, valves, lights, etc. When connected to a Wireless Receiver, this product line can be used with a variety of wireless

battery-less sensors and switches.

Each controller uses the LONWORKS® technology for peer-to-peer communication between controllers and are LONMARK certified.

General Installation Requirements

For proper installation and subsequent operation of the device, pay special attention to the following recommendations:

£It is recommended that the controller(s) be kept at room temperature for at least 24 hours before installation to allow any condensation that may

have accumulated due to low temperature during shipping/storage to evaporate.

£Upon unpacking, inspect the contents of the carton for shipping damages. Do not install a damaged device.

£The device is designed to operate under environmental conditions that are specified in its datasheet.

£Ensure proper ventilation of the device and avoid areas where corroding, deteriorating or explosive vapors, fumes or gases may be present.

£Record the 12-character Neuron® ID located on either end of the device (shown on a sticker below the barcode), for later commissioning.

£Allow for proper clearance around the device’s enclosure and wiring terminals to provide easy access for hardware configuration and maintenance.

£When installing in an enclosure, select one that provides sufficient surface area to dissipate any heat generated by the device and by any other de-

vices installed in the enclosure. A metal enclosure is preferred. If necessary, provide active cooling for the enclosure.

£The device’s datasheet specifies the power consumption (amount of heat generated), the operating temperature range, and other environmental

conditions the device is designed to operate under.

£Ensure that all equipment is installed according to local, regional, and national regulations.

£Do not drop the device or subject it to physical shock.

£If the device is used and/or installed in a manner not specified by Distech Controls, the functionality and the protection provided by the device may

be impaired.

Any type of modification to any Distech Controls product will void the product’s warranty

Before installation of the Wireless Receiver, verify that local communication regulations allow the installation of wireless devices and

available frequencies to be supported in your area. Refer to the Open-to-Wireless™ Application Guide for more information.

Take reasonable precautions to prevent electrostatic discharge to the device when installing, servicing or during operation. Discharge

accumulated static electricity by touching one’s hand to a well-grounded object before working with the device.

Installation Guide

2 / 14

Device Markings (Symbols)

Certain markings (symbols) can be found on the controller and are defined as follows:

Symbol Description

CE marking: the device conforms to the requirements of applicable EC directives.

UKCA marking: the device conforms to the requirements of applicable Great Britain regulations.

Products must be disposed of at the end of their useful life according to local regulations.

Read the Hardware Installation Guide for more information.

UL marking: conforms to the requirements of the UL certification.

FCC marking: This device complies with FCC rules part 15, subpart B, class B.

Warning Symbol: Significant information required. Refer to the Hardware Installation Guide.

Alternating Current

Direct Current

General Wiring Recommendations

Risk of Electric Shock: Turn off power before any kind of servicing to avoid electric shock.

£All wiring must comply with electrical wiring diagrams as well as national and local electrical codes.

£To connect the wiring to a device, use the terminal connectors. Use a small flat screwdriver to tighten the terminal connector screws once the wires

have been inserted (strip length: 0.25’’ (6mm), maximum tightening torque 0,4 Nm (3.45 in-lb)).

£Comply with all network and power supply guidelines outlined in the Network Guide.

£Keep wiring separate according to their function and purpose to avoid any ambient noise transmission to other wires. Use strapping to keep these

wires separated. For example, keep power, hazardous voltage, SELV, PELV, network, and input wiring separate from each other.

£Power cables must be between 18 and 14 gauge (0.82 to 2.1mm2 cross-sectional area). When connecting one wire to a controller’s terminal block

clamping cage (pole), the wire must be between 22 and 14 gauge (0.33 and 2.1mm2 cross-sectional area). When connecting two wires to a con-

troller’s terminal block clamping cage, both wires must be the same thickness, both wires must be between 22 and 16 gauge (0.33 to 1.3mm2 cross-

sectional area), and both wires must be of the same type (solid or stranded). Twist the wires together and insert then into the controller’s terminal

block clamping cage. For any other wiring combination (mixed wire thickness, mixed solid and stranded conductors, more than three wires, wire

thickness is out of range), twist the wires together and use a wire nut and a pig tail to connect to the controller’s terminal block connector as show

below.

Controller

Wire Nuts

Terminal Block

Connector

Wire Connections

Pigtails

Figure2: Using a Wire Nut and Pigtail to Wire the Controller

£Keep input and output wiring in conduits, trays or close to the building frame if possible.

£Always use unshielded cabling with a minimum Category 5 (CAT5) cable for ethernet communications.

£Do not connect the universal inputs, analog/digital outputs or common terminals to earth or chassis ground (unless stated otherwise and/or using

shielded Ethernet cable).

3 / 14

Controller Dimensions & Components

±0.20

[± 5]

2.27 [57.62]

7.90 [200.61]

6.09 [154.76]

0.55 [13.85]

0.86 [21.95]

5.51 [139.93]

2.75 [69.96] 3.70 [94.04]

Profile

0.40 [10.05]

1.25 [31.75]

Inches [Millimeters]

2.27 [57.62]

Sliding Grommet

FrontFront

Damper Shaft

Clamping

Mechanism

Opening for

Damper Shaft

Actuator

Clutch for

Manual

Adjustment

Pressure Sensor Inputs –

High-Low Sensor Connection

Polarity is Unimportant

Service Pin

Figure3: ECL-VAVS Dimensions and Components

7.90 [200.61]

6.09 [154.76]

0.55 [13.85]

0.86 [21.95]

3.70 [94.04]

Sliding Grommet

Front Profile

10.84 [275.26]

5.42 [137.63]

Ø 0.875 (7/8)

[Ø 22.23]

4 Positions

½-inch

knockout:

0.40 [10.05]

1.25 [31.75]

Inches [Millimeters]

±0.20

[± 5]

Figure4: ECL-VAVS Controller with Terminal Covers Dimensions

Mounting Instructions

Each controller is specially designed for easy installation either directly on an air duct or in a panel by using the integrated mounting collar and the screw

that is provided with the controller. This mounting arrangement opposes the torque applied to the damper shaft.

Mounting Position

To prevent condensation on the VAV box’s damper shaft from entering the controller’s electronics, the controller’s mounting orientation should be any

position above the damper shaft (between 0 and 180°) so that any condensation from the damper shaft will fall away from the controller’s electronics.

Further countermeasures may be required in some installations. This is important in hot, humid climates where the VAV box is located near exterior

doors or loading bays that may be blocked open or when the VAV box air supply is below 50°F.

4 / 14

VAV Box Shaft

0° 180°

90°

270°

Figure5: Recommended Mounting Position Angle Range

Mounting Procedure for Terminal Covers

Terminal covers can be added to any VAV controller to protect inadvertent contact with the controller’s electrical connections.

£A terminal cover kit can be added to both sides of the controller.

Controllers with terminal block covers can only be mounted on a flat surface that is sufficiently large to provide space around the installation. In this sce-

nario, conductors must be made inaccessible and wiring must comply with local wiring regulations and methods appropriate for fixed equipment installa-

tion in a building (the use of cable conduits and trunking for example).

1. Separate the cover from the base of the terminal covers.

2. Attach the base of the terminal cover(s) to the underside of the VAV controller’s body with the tabs shown in Figure 7 .

3. Install the VAV controller according to the next procedure, VAV Controller Mounting Procedure.

Tabs that latch to the VAV controller’s body

Figure6: Terminal Cover Attachment Tabs

4. Connect and wire the controller according to the procedures shown later in this document.

VAV Controller Mounting Procedure

Mount the controller as follows:

1. The VAV controller comes with the sliding grommet pre-installed.

2. Orient the controller into position on to the damper shaft so that wiring connections are easily accessible. The controller must be fitted onto the shaft

such that the base of the controller is parallel to the VAV box (perpendicular to the damper shaft). If the damper shaft has an external bushing that

prevents the controller from being mounted flush to the side of the VAV box, use a spacer of the same thickness to compensate and to ensure the

controller is at a right-angle to the shaft to prevent binding.

5 / 14

3. Screw the controller onto the VAV box through the controller’s Sliding Grommet. The sliding grommet allows the controller to move back and forth

when the VAV box’s damper shaft is off center. Ensure to center the grommet along its travel range and ensure that the screw enters the VAV box at

a right angle. Using a power screwdriver with a 6” extension (Figure 7), attach the controller to the VAV box with the 1” [25mm] screw provided with

the controller (Figure 8) through the controller's sliding grommet as shown in Figure 10. Otherwise, mark the positions for the screw on the VAV box

with a punch and then drill a hole the into the VAV box. Then attach the controller to the VAV box with the 1” [25mm] screw provided with the con-

troller.

Figure7: Screwdriver Shaft Extension

90°

Operational

Grommet

Travel

Range

At Installation,

Align

Grommet to

this Mark

Sliding Grommet

Figure8: Supplied Mounting Hardware – Drive the screw at a right-angle to the VAV Box

Avoid over-tightening the screw so as to not strip the threads. Make sure the screw does not pierce too far into the VAV box and interfere

with damper blade movement.

4. Find the damper position by the marking typically found on the end of the damper shaft.

Figure9: Typical Damper Shaft End Marking

5. Determine the direction required to close the damper: Clockwise (CW) or Counterclockwise (CCW). Turn the damper shaft with a pair of pliers to fully

close the damper for 90° boxes or fully open the damper for 45° or 60° boxes

6. Press and hold down the

Actuator Clutch for Manual Adjustment

button (see Figure 3), and turn the controller’s shaft coupler until it touches the me-

chanical end-stop to either the fully closed position (90° boxes) or the fully open position (45° and 60° boxes).

7. For 90° VAV boxes: If the damper closes CCW, turn the coupler to the CCW mechanical stop limit. If the damper closes CW, turn the coupler to the

CW mechanical stop limit. The open mechanical stop is factory preset for 90° boxes.

For 45° and 60° VAV boxes: The mechanical stops must be set for both the fully closed and fully open damper positions. By installing the controller at

the fully open position, the controller provides the open mechanical stop for 45° and 60° boxes. The closed damper seal provides the fully closed

stop.

8. Tighten the U-Bolt clamp on to the damper shaft using an 5/16 in. wrench or socket. Tighten the bolts between 100 and 130 lb-in.

9. Test for free damper shaft movement: Press and hold down the

Actuator Clutch For Manual Adjustment

button and manually turn the actuator cou-

pling to be certain that the actuator can rotate from full closed to full open positions without binding.

10. Connect the VAV box’s flow sensor tubing to the controller’s

Pressure Sensor Inputs

. The connection is polarity free (high-low ports are interchange-

able). Create a condensation trap in the pneumatic tubing by forming it into a vertical loop.

11. Finalize the installation by rotating the damper to the full open position.

6 / 14

Damper

Shaft

VAV Box

MillimetersInches

>40.00>1.50"

Minimum:

Sliding Grommet

Opening for

Damper Shaft

Mounting Screw

Figure10: Standard Mounting Method: Mounting a controller on a damper shaft

Power Wiring

Voltage: 24VAC/DC; ± 15%, Class 2

This is a Class 2 Product. Use a Class 2 transformer only (rated at 100VA or less at 24VAC) to power the

controller(s).

The Network Guide provides extensive information and requirements for powering a controller that uses a LONWORKS network for communications. It can

be downloaded from the Distech Controls’ Documentation and Resources Portal.

It is recommended to wire only one controller per 24VAC transformer.

When calculating a controller’s power consumption to size the 24VAC transformer, you must also add the external loads the controller is going to supply,

including the power consumption of any connected subnet module (for example, Allure™ Series Communicating Sensors).

If only one 24VAC transformer is available, determine the maximum number of daisy-chained VAVs that can be supplied on a single power cable sup-

plied by a 100 VA transformer, according to the controller’s expected power consumption including external loads, the cable’s wire gauge, and the total

cable length from the following figure. Any installation condition that is outside of the parameters of the following graph should be avoided.

To maximize daisy-chaining performance, the transformer should be installed as close as possible to the first VAV. If this is not possible, then use 14

AWG wire to power the first VAV which can help reduce a voltage drop at the end of the daisy-chain.

The recommended minimum peak input voltage is 27.2Vp

7 / 14

100 150 200 250 300 350 400 450 500

Max VAVS in Daisy-Chain

Total Wire Length

Daisy Chain Performance

VAVS + SmartVue (AWG18)

VAVS + SmartVue (AWG16)

VAVS + SmartVue + 2DO (1,6VA each) (AWG18)

VAVS + SmartVue + 2DO (1,6VA each) (AWG16)

VAVS + SmartVue + SmartVue CO2 + 2DO (1,6VA each) (AWG18)

VAVS + SmartVue + SmartVue CO2 + 2DO (1,6VA each) (AWG16)

(30) (45) (60) (75) (90) (105) (120) (135) (150)

Feet

(meters)

Figure11: Maximum Number of VAVS Devices on a Daisy-Chain at Evenly Spaced Intervals

Laboratory testing conditions for the above graph are as follows:

£Distance between each VAV is evenly spaced along the entire wire length

£Transformer specification: 100VA (120/24VAC)

£Tested at room temperature with low voltage line conditions: 108VAC (50Hz)

Daisy-Chain Wiring

Use an external fuse on the 24VAC side (secondary side) of the transformer, as shown below, to protect all controllers against power line spikes.

Maintain consistent polarity when connecting controllers and devices to the transformer. That is, the COM terminal of each controller and each peripheral

should be connected to the same terminal on the secondary side of the transformer.

Failure to maintain consistent polarity throughout the entire network will result in a short circuit and/or damage to the

controller!

The COM terminals of the controller are internally wired to the 24V COM terminal of the power supply. Connecting a

peripheral or another controller to the same transformer without maintaining polarity between these devices will

cause a short circuit.

8 / 14

Fuse: 4 A Max.

Fast Acting

24 VAC

Controller 1

24V AC

24V COM

Controller

24V AC

24V COM

Transformer

OPTIONAL GROUNDING:

All grounding is optional for

LON networks

Figure12: Power Wiring

Input Wiring

Before connecting a sensor to the controller, refer to the installation guide of the equipment manufacturer.

£For a wire length less than 75’ (23m), either a shielded or unshielded 18AWG wire may be used.

£For a wire up to 200’ (61m) long, a shielded 18AWG wire is recommended.

£The shield of the wire should be grounded on the controller side only and shield length should be kept as short as possible.

£COM inputs (UIx) are internally connected to 24V COM.

Table 2 shows the available universal input (UIx) wiring methods

Sensor Input Type Input Connection Diagram

£Dry Contact input.

UIx

COM

To Digital

Input

Digital Dry Contact

NO-NC

£Thermistor Input (for example, 10kΩ type II and III).

UIx

COM

To Analog-

To-Digital

Converter

RTD/

Thermistor

£Resistive input, maximum 350kΩ (for example, use with 10kΩ and 100kΩ poten-

tiometers).

UIx

COM

To Analog-

To-Digital

Converter

Potentiometer

10kΩ

£0 to 20mA input used with a 2-wire, 0 to 20mA sensor powered by an external 24

AC/DC power supply.

0-20mA

Sensor

UIx

COM

To Analog-

To-Digital

Converter

24VDC

249Ω ¼W

165Ω

£0 to 20mA input used with a 3-wire, 0 to 20mA sensor powered by an external 24

AC/DC power supply. It is recommended to supply the external power supply with

the same 24VAC as the controller.

Common

0-20mA

Sensor

UIx

COM To Analog-

To-Digital

Converter

24VAC

249Ω ¼W

165Ω

9 / 14

Sensor Input Type Input Connection Diagram

£0 to 20mA input used with a sensor powered by its own power source.

0-20mA

Sensor

UIx

COM

To Analog-

To-Digital

Converter

249Ω ¼W

165Ω

£Voltage input used with a 3-wire 0 to 10VDC sensor powered by an external 24

AC/DC power supply. It is recommended to supply the external power supply with

the same 24VAC as the controller.

Common

0-10V

Sensor

UIx

COM To Analog-

To-Digital

Converter

24VAC

£Voltage input used with a 0 to 10VDC sensor powered by its own power source.

0-10V

Sensor

UIx

COM

To Analog-

To-Digital

Converter

Output Wiring

Before connecting an output device (actuator, relay, etc.) to the controller, refer to the datasheet and installation

guide of the equipment manufacturer.

£For a wire length less than 75’ (23m) long, either a shielded or unshielded 18AWG wire may be used.

£For a wire length up to 200’ (61m) long, a shielded 18AWG wire is recommended.

£The shield of the wire should be grounded on the controller side and the shield length should be kept as short

as possible.

£For relay outputs (DOx); select appropriately-sized wiring suitable to the current load.

£All digital outputs (DOx) are internally powered by the controller’s 24VAC power supply.

£External power cannot be applied to any digital outputs (DOx)

£Digital outputs (DOx) do not support 24VDC power input

£COM outputs (UOx) are internally connected to 24V COM.

Control Output Type Output Designation Output Connection Diagram

£Discrete 0 or 12VDC digital, Pulse, or PWM output controlling

a 12VDC relay

UOx

From

Digital

Output

12VDC Relay

UOx

COM

£Linear 0 to 10VDC digital to analog output. UOx

0-10V

Common

From Digital-

To-Analog

Output

UOx

COM

£0 to 10VDC voltage output controlling an analog actuator that

is powered by an external 24VAC power source.

UOx

0-10V

~ or +

From Digital-

To-Analog

Output

UOx

COM

Actuator

or -

24VAC

£24VAC internally-powered triac output controlling a relay. DOx

24 VAC Relay

DOx

24VAC Out

£24VAC internally-powered triac output controlling a floating ac-

tuator1.

DOx

24VAC Out

Actuator

DOx ~

£1 to 10VDC voltage output controlling dimmable lighting bal-

lasts that require a current sink output (pull-down).

£This output can sink up to 2.5mA.

UOx

0-10V

Common

From Digital-

To-Analog

Output

UOx

COM

Ballast

Line

VAC

Neutral

1. Maximum output current for all digital triac outputs is 0.5A continuous or 1A @ 15% duty cycle for a 10-minute period.

10 / 14

Subnet Wiring

The subnet is used to connect a range of Allure Series Communicating Sensors:

£The Allure EC-Smart-Vue Series sensor is a communicating room temperature sensor with backlit display graphical menus and VAV balancing ca-

pabilities.

£The Allure EC-Smart-Comfort and Allure EC-Smart-Air Communicating Sensors are a range of communicating room temperature sensors.

Connect the Allure Series to the controller’s Subnet Port with a standard Category 5e Ethernet patch cable fitted with RJ-45 connectors. Refer to the Net-

work Guide for extensive information and requirements for the connection of the Allure Series. It contains information about network topology and length,

cable type, setting the Subnet ID, etc. It can be downloaded from the Distech Controls’ Documentation and Resources Portal. See also the Hardware In-

stallation Guide supplied with the Allure Series.

If you make your own patch cable, see the Allure Series Hardware Installation Guide.

Protect the controller’s connector from being pulled on when a cable to the Allure Series is connected. Create a

strain-relief by looping the cable and attaching it to a solid object with a nylon tie so that a tug on the cable will not

pull out the connector on the controller.

Communications Wiring

The recommended cable type for LONWORKS® communications is 22AWG (0.65 mm), twisted pair, unshielded. The LONWORKS communication wire is po-

larity insensitive and can be laid out in a bus, star, loop or free topology. For loop topology, polarity is important, special care must be taken when con-

necting the LONWORKS network to avoid short circuit.

It is recommended to use the bus topology network configuration for all LONWORKS communication wiring, as it allows

for easy network troubleshooting.

Connect both wires to the LON+ and LON‑ terminals of the controller. If inserting multiple wires in the terminals, ensure to properly twist wires together

prior to inserting them in the terminal connectors.

Front

LON

Front

LON

LON Network

To Next

Controller

Figure13: Communication Wiring

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