Johnson Controls LN Series User manual

LN Series Compact VAV Controllers Installation Instructions 1

Application

The LN Series Compact Variable Air Volume (VAV)

controller line is designed to meet the requirements of

single duct VAV or Variable Volume according to

Temperature (VVT) applications. You can directly

control a combination of up to two pieces of equipment

such as baseboards, duct heating/cooling, multi-stage

heaters, fans, valves, and lights. The LN Series

Compact VAV controllers are compatible with a wide

range of sensors and peripheral equipment.

The controllers are based on LONWORKS® technology

for peer-to-peer communication between controllers

and are LONMARK® network certified.

North American Emissions Compliance

United States

Canada

Installation

For proper installation and subsequent operation of the

LN Compact VAV/VVT controllers, follow these

recommendations:

• Upon unpacking your controller, inspect the

contents of the carton for shipping damage. Do not

install damaged devices.

• Allow for proper clearance of device casing, wiring

terminals, and service pin for easy access,

hardware configuration, and maintenance. Record

the Neuron® ID located on top of the device; you

need it for commissioning the device.

• Operate the controllers under the following

conditions:

- Ambient temperature between 32 to 158°F

(0 to 70°C)

- Relative humidity from 0 to 95%,

noncondensing

• Ensure proper ventilation of devices, and avoid

areas where corroding, deteriorating, or explosive

vapors, fumes, or gasses may be present.

Compliance Statement (Part 15.19)

This device complies with Part 15 of the FCC Rules.

Operation is subject to the following two conditions:

1. This device may not cause harmful interference, and

2. This device must accept any interference received,

including interference that may cause undesired

operation.

Warning (Part 15.21)

Changes or modifications not expressly approved by the

party responsible for compliance could void the user’s

authority to operate the equipment.

This Class (A) digital apparatus meets all the

requirements of the Canadian Interference-Causing

Equipment Regulations.

Industry Canada Statement

Le terme « IC » précédant le numéro d'accréditation/

inscription signifie simplement que le produit est conforme

aux spécifications techniques d'Industry Canada.

IMPORTANT: Work in a static-free area. Discharge

any static electricity you may have accumulated.

Discharge static electricity by touching a known,

securely grounded object. Do not handle the

controller without proper protection against static

discharge. Use a wrist strap when handling the

controller. Secure the wrist strap clamp to earth

ground.

LN Series Compact VAV Controllers

Installation Instructions

LN-VAVLFS-1, LN-VVTLFS-1, LN-VAVCFS-1 Code No. LIT-12011318

Release 4.1

Issued October 6, 2008

Supersedes November 9, 2007

LN Series Compact VAV Controllers Installation Instructions2

Dimensions

Mounting

Location Considerations

The LN Compact VAV/VVT controllers are designed for

easy installation. The integrated mounting brackets on

each controller have a diameter of 0.2 in. (5 mm) and

are designed to oppose the shaft torque.

Note: Units with a damper actuator only have one

screw.

To mount the controller:

1. Mount the device directly on an air duct or in a

panel by using the integrated damper brackets and

screws.

2. Remove the terminal blocks, and use the controller

mounting slots to mark the location of any holes to

drill.

3. Remove the device and drill holes.

4. Clean the perforated surface, and fasten the

device using the appropriate screw types.

5. Ensure the damper shaft is at least 1.5 in. (40 mm)

so the damper bracket can fit securely around the

damper shaft. If required, limit the maximum

damper shaft rotation by modifying the position of

the stroke end-stops in 5° increments.

Figure 1: LN Series Compact VAV Controller

Dimensions

Figure 2: Controller Components

LN Series Compact VAV Controllers Installation Instructions 3

Note: To connect the high- and low-pressure sensors

(see Figure 3), use flexible tubes with a 1/4 in.

(6.4 mm) external diameter and 5/32 in. (4 mm) internal

diameter.

Wiring

Recommendations

• Use the removable terminal connectors to make all

wiring connections.

• Disconnect the terminal connectors from the

device for wiring.

• Use a small, flat screwdriver to tighten the terminal

connector screws after inserting the wires.

• Keep analog type cables (for power, voltage,

current inputs, or triac outputs) apart from other

types of wiring to avoid any ambient noise

transmission among wires; however, unswitched

power wiring can be in the same conduit as the

LONWORKS communication cable.

The board connectors accept wires or flat cables

ranging from 22 to 12 AWG (0.645 to 2.052 mm

diameter) per pole; however, power cables must

remain between 18 and 14 AWG (1.024 to 1.628 mm

diameter).

Note: The transformer powering the controller must

be configured as a floating transformer. Do not ground

the transformer.

Power Wiring

Device power requirements: 24 VAC ±15%, Class 2

Note: To conform to Class 2 requirements in the

United States, use transformers of 100 VA or less to

power the controller.

For power and ground wiring, use the heaviest gauge

wire based on a maximum of 14 AWG and a minimum

of 18 AWG.

If powering more than one device, use the following

methods to calculate the power requirements of the

required transformer:

1. Add up the maximum power consumption of all

devices, and multiply this sum by 1.3.

2. If the resulting number is higher than 100 VA,

consider using multiple transformers.

Use an external fuse on the 24 VAC side (secondary

side) of the transformer to protect all devices against

power line spikes (Figure 4).

Maintain consistent polarity when connecting

controllers and devices to the transformer. Connect the

COM of each controller and each peripheral to the

same terminal on the secondary side of the

transformer.

IMPORTANT: Make all wiring connections in

accordance with the National Electrical Code and all

local regulations. User copper conductors only. Do

not exceed the control’s electrical rating.

CAUTION: Risk of Electric Shock.

Disconnect power supply before making

electrical connections to avoid electric

shock.

min.40mm(1.5")

Figure 3: Mounting a VAV or VVT Device on a

Damper Shaft

IMPORTANT: Do not connect the analog/digital

inputs or common terminals to the ground (only if

otherwise stated).

LN Series Compact VAV Controllers Installation Instructions4

Note: The LN Series Compact VAV/VVT controllers

are half wave rectified. Connecting two half wave power

supplies to the same transformer without maintaining

polarity causes a short circuit. The controller uses

24 VAC ±15%.

Note: Ensure the transformer is floating and not

grounded.

The triac outputs of the LN Series Compact VAV/VVT

controllers are protected against power surges and

short circuits by a standard 3 A removable glass fuse

(5 x 20 mm).

Input Wiring

The LN Series Compact VAV/VVT controllers have

physical connections for four inputs. The controller

inputs are software configurable from within the

device’s LNS® plug-in. Each input can be configured

for digital, resistive, current, or voltage signals. You

must configure the input types properly in the software

plug-in or wizard to ensure proper input readings.

Wiring Digital and Resistive 10k ohm Inputs

Use this input configuration to monitor digital dry

contracts and 10k ohm NTC thermistors.

Resistive 1k ohm Inputs

Use this input configuration to monitor 1k ohm platinum

Resistance Temperature Devices (RTDs).

Resistive PT100 Inputs

Use this configuration to monitor PT100 platinum

RTDs.

Wiring Current Inputs

Current inputs can have a range of 4 to 20 mA. Connect

the current input if the transducer is externally powered.

Use a transducer with 2-wire, 4-20 mA. See Figure 10.

IMPORTANT: The COM terminals of the controller

are internally wired to the 24 V COM terminal of the

power supply; therefore, if powering peripherals and

controllers with the same transformer, it is essential

to maintain polarity. Failure to do so results in a

short circuit and/or a damaged device.

Figure 4: Power Wiring

Fuse

24VAC

Transformer

Controller 2

Controller 1

24VAC

COM AC

24VAC

COM

Figure 5: 10k ohm NTC Thermistor Input

UIx

COM

NTC Thermistor

10kΩ

Figure 6: 10k ohm Potentiometer Input

UIx

COM

Potentiometer

10kΩ

Figure 7: Digital Dry Contact (Normally Open

[NO] and Normally Closed [NC])

UIx

COM

Digital DryContact

NO-NC

UIx

COM

PlatinumRTD

1kΩ

Figure 8: 1k ohm Platinum RTD Input

UIx

COM

PlatinumRTD

PT100

Figure 9: PT100 Platinum RTD Input

Figure 10: Current Input - 2-Wire Transducer

UIx

COM

24VDC

Resistor - 249Ω/ ¼W

4-20mA

Transducer

LN Series Compact VAV Controllers Installation Instructions 5

Connect the current input if the transducer is powered

by its own power source. See Figure 11.

Wiring Voltage Inputs

Voltage inputs have a range of 0 to 10 VDC, with +/-

0.5% accuracy. Connect the voltage input according to

Figure 11.

LN Series LN-VSTAT-1 Sensor Wiring

Each VAV controller is compatible with the LN Series

line of standard room sensors. Each controller is also

compatible with the LN-VSTAT Sensor, an advanced

sensor with an a Liquid Crystal Display (LCD) and VAV

balancing capabilities.

Output Wiring

The LN VAV/VVT controllers have physical

connections for four digital outputs and two universal

analog outputs. The digital outputs are all hardware

configurable and must be configured by changing the

jumper settings on the printed circuit board.

Wiring Digital Outputs

You can configure the digital outputs as either powered

outputs or non-powered outputs. When wiring digital

outputs:

• the non-powered output type does not have any

voltage on the output terminals when the output is

active. Power must be supplied externally.

• the powered output type has 24 VAC on the output

terminals when the output is active. Power is,

therefore, supplied internally by the controller.

Note: The LN VAV/VVT controllers are shipped with

all digital outputs configured as powered outputs.

Maximum output current for all digital outputs (powered

or non-powered) is 1A.

DO1 and DO2 are controlled by a single jumper and

must be set identically. Similarly, DO3 and D04 are

controlled by a single jumper and must be set

identically. The jumpers specify whether an internal or

external power source is in use. The C terminal

between DO1 and DO2 is common to DO1 and DO2

only. Similarly, the C terminal between DO3 and DO4

is common to DO3 and DO4 only.

Note: You must connect an external load to measure

the state of a digital output (TRIAC). See Figure 12 and

Figure 13.

When you control an external floating actuator, wire the

controller to the actuator (Figure 14).

Figure 11: Current Input with Internal Power

Source

UIx

COM

Resistor - 249Ω/ ¼W

4-20mA

Transducer

Figure 12: Voltage Input

UIx

COM

0-10V

Transducer

Figure 13: Digital Output with External Power

DOx

Cx-x

JUMPER

SETTINGS

Relay

Figure 14: Digital Output with Internal

Power Supply

DOx

Cx-x

JUMPER

SETTINGS Relay

Figure 15: Digital Output with Internal Power

Supply (for Floating Actuators)

DOx

Cx-x

Actuator

DOx ~

JUMPER

SETTINGS

LN Series Compact VAV Controllers Installation Instructions6

Wiring Universal Outputs

Universal outputs can be configured to provide either a

linear signal ranging from 0 to 10 VDC or a discrete

signal of 0 or 12 VDC. The discrete signal can be used

to generate a Pulse Wave Modulation (PWM) signal or

a simple two-state signal. These outputs are protected

by an auto-reset fuse.

When controlling a relay with a universal output, a

diode must be connected in parallel to protect the

controller from back-emf current that occurs when the

relay is turned off. It is recommended to use diodes

that are part of the 1N400x family; they should be

placed closer to the relay.

When controlling an analog actuator, wire the controller

to the actuator in Figure 18

Communications Wiring

Approved cable types for LONWORKS communications

are Level 4 22 AWG (0.65 mm), UNSHIELDED. You

can use both one pair and two pair wires. The

LONWORKS communication wire is polarity insensitive

and can be laid out in a bus, star, loop, or free

topology.

Note: The Bus topology network configuration allows

for easy network troubleshooting for LONWORKS

communication wiring.

Connect both wires to the LONWORKS Terminals 1 and

2 of the controller. If you are inserting multiple wires in

the terminals, make sure to properly twist the wires

together prior to inserting them in the terminal

connectors (Figure 18).

For additional information and detailed explanations on

network topology and wire length restrictions, refer to

the Echelon® Junction Box and Wiring Guideline for

Twisted Pair LONWORKS Networks

(Part No. 005-0023-01).

Note: Use proper network terminators depending on

the type of network topology used. Failure to do so may

result in communication errors between controllers. Do

not use multiple gauges of cable on the same

communication bus, as this may also result in

communication errors.

Selecting Network Terminators

For bus topology, two network terminators are required

(one at each end of the bus topology channel). For a

free topology, one network terminator is required. You

can put it anywhere on the channel.

Networking Guide

To commission a device and add it to a LONWORKS

network, you need to use the device plug-in as well as

the .xif and.apb files. To obtain the files:

Note: These commissioning steps only apply when

you are using an LNS network management tool, such

as LN-Builder 3.

1. Visit the Johnson Controls® intranet site

(www.my.johnsoncontrols.com) and download the

latest version of the plug-in installation setup. You

can also contact your Johnson Controls

representative to obtain the file.

2. Run the installation setup to install the device

plug-in and latest version of the .xif and.apb files.

The.xif and.apb files install in the

C:\LONWORKS\Import\JCI folder.

0-10VDC

Common

UOx

COM

Figure 16: 0 to 10VDC Analog Output

12VDCRelay

UOx

COM

Figure 17: 0 or 12 VDC Discrete Output

Actuator

24VAC

UOx

COM

0-10VDC

Figure 18: Connecting to an

External Analog Actuator

Figure 19: Communications WIring

Controller 2

Controller 1

LON1

LON2

LON Network

LON1

LON2

LN Series Compact VAV Controllers Installation Instructions 7

3. Register the plug-in in the network database. This

step creates a new device template that you use to

commission your device.

4. Add and commission the device with LN-Builder 3

using the proper device template and .apb file.

Neuron ID and Service Pin

To commission a device and add it to a LONWORKS

network, you need the Neuron ID of the device. To

obtain the Neuron ID:

• manual entry: the Neuron ID address and bar code

are located on a sticker on the device.

• service pin: pressing the service pin on the device

broadcasts the Neuron ID on the LONWORKS

network.

Memory Erase Jumper

The LN VAV/VVT controllers feature a memory erase

jumper which can be used to erase the Neuron chip. If

you load an incorrect .apb file into the controller, the

Neuron chip’s memory becomes corrupt. Use the

E-Blank jumper to correct the problem by returning the

chip to an application-less state. The E-Blank jumper is

labelled J9 on the PCB board.

To erase the Neuron chip’s memory using the E-Blank

jumper:

1. Disconnect the power to the controller.

2. Place a jumper on the pins labelled J9 on the board

(Figure 20).

3. Reconnect power to the controller.The orange-

colored service Light-Emitting Diode (LED) blinks

rapidly, indicating that it is erasing the Neuron

chip’s memory. When the light becomes solid (and

stops blinking), the erase procedure is complete.

4. Disconnect the power to the controller and remove

the jumper.

5. Reconnect the power. The service LED blinks

twice and becomes solid indicating the controller is

application-less.

6. Load the proper .apb file into the controller.

Note: If the device already exists in the LNS

database, you must use the Load or Commission

option in LN-Builder 3 to download the .apb file. Do not

use the Replace option.

Disposal

The Waste Electrical and Electronic Equipment

(WEEE) Directive sets out regulations for the recycling

and disposal of products. The WEEE2002/96/EG

Directive applies to stand-alone products. This

represents products that can function entirely on their

own and are not a part of another system or piece of

equipment.

For this reason, Johnson Controls products are exempt

from the WEEE Directive. Nevertheless,

Johnson Controls products are marked with the WEEE

symbol (Figure 21), indicating that disposal of the

devices shall not be done with municipal waste.

Products must be disposed of at the end of their useful

life according to local regulations and the WEEE

Directive.

IMPORTANT: Downloading an improper .apb file

into the device may damage the Neuron chip in your

controller. The controller may become unusable.

Figure 20: E-Blank Jumper (J9) Location

Figure 21:

WEEE

Symbol

LN Series Compact VAV Controllers Installation Instructions8

Troubleshooting

Table 1: Troubleshooting (Part 1 of 2)

Problem Possible Cause Solution

Device is powered but does

not turn on. Fuse is blown. Check the fuse integrity; also ensure the green power LED

next to the service pin is on.

Power supply polarity Verify consistent polarity is maintained between all

controllers and the transformer.

Device cannot

communicate on a Free

Topology Transceiver (FTT)

network.

Absent or incorrect supply

voltage Check power supply voltage between 24 VAC and COM

pins to ensure it is within acceptable limits. Check for a

tripped fuse or circuit breaker.

Overloaded power

transformer Verify the transformer used is powerful enough to supply all

controlled devices.

Network not wired property Double-check the wire connections are correct.

Absent or incorrect network

terminators Check the network terminators.

Device communicates well

over a short network but

does not communicate on a

large network.

Network length Check that the total wire length does not exceed the

specifications of the FTT User’s Guide.

Wire type Check that the wire type agrees with the specification of the

FTT User’s Guide. Verify your wire is UNSHIELDED.

Network wiring problem Verify the wire connections are correct.

Absent or incorrect network

terminators Check the network terminators. Incorrect or broken

terminators make the communication integrity dependent

upon a device’s location on the network.

Extra capacitance Verify that no extra capacitances are connected to the

network other than the standard FTT circuit, and a

maximum of 3 meter stub (in bus topology).

Number of devices on

network segment exceeded Use a router or a repeater in accordance to the FTT User’s

Guide. The number of devices on a channel should never

exceed 64.

Network traffic Query node statistics to check for errors. Use a LON

protocol analyzer to check network traffic.

Hardware Input is not

reading the correct value. Input wiring problem Check that the wiring is correct according to this manual

and according to the peripheral device’s manufacturer.

Open circuit or short circuit Using a voltmeter, check the voltage on the input terminal.

Short circuit (0 V) and open circuit (10 V).

Configuration problem Using a device configuration plug-in or wizard, check the

configuration of the input. Refer to the device’s user guide

for additional information.

Hardware output is not

operating correctly. Output wiring problem Check that the wiring is correct according to this manual

and according to the peripheral device’s manufacturer.

Configuration problem Using the device configuration plug-in, check the

configuration of the output. Refer to the device user’s guide

for more information.

0-10 V output, 24 VAC

powered actuator is not

moving.

Check the polarity of the 24 VAC power supply connected

to the actuator while connect to the device. Reverse the 24

VAC wire if necessary. Check the jumper setting for the

external power supply as shown in Figure 15.

Published in U.S.A. www.johnsoncontrols.com

LN Series Compact VAV Controllers Installation Instructions 9

Metasys® and Johnson Controls® are registered trademarks of Johnson Controls, Inc.

Building Efficiency

507 E. Michigan Street, Milwaukee, WI 53202

Service LED

Flow sensor is not giving

proper readings. Tubing connection problem Verify the tubing is installed properly and that the tubing is

not bent. Ensure the high and low pressure sensors are not

inverted.

Device is not calibrated

properly. Recalibrate the VAV controller. Refer to the controller user

guide for more information about VAV controller calibration.

Damper is not opening or

closing properly. Mechanical stops not in

proper position. The two mechanical stops must be positioned to stop the

damper motion when it is completely closed and

completely opened. The mechanical stops can be moved

by increments of 5°.

Rotation time not set up

correctly for external

damper.

Ensure the external damper drive time is set to the correct

value (in the plug-in or wizard).

VAV still in Calibration mode Complete the calibration process in LN-Builder 3.

Controller in Override Set the Override OFF in the object manage screen in

LN-Builder 3.

Table 1: Troubleshooting (Part 2 of 2)

Problem Possible Cause Solution

Table 2: Service LED (Amber Color)

Service LED Operation Status

OFF (does not apply to LN-VAVCF-1) The device is in normal operation.

Repeated Blink (LN-VAVCF-1 only) The device is in normal operation. The LED blinks according to the device

code execution time.

On The device is application-less. Reload the application file (.apb).

Slow Blink

(1 second On, 1 second Off) The device is unconfigured. Commission the device.

Fast Blink

(0.3 second On, 1 second Off) Watchdog time out. Application corrupted. Use the E-Blank jumper to

wipe the Neuron chip’s memory. Then load the proper .apb into the

device using a LN-Builder 3.

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