Johnson Controls LN-PFCU-1 Installation Instructions Manual

Brand: Johnson Controls

Model: LN-PFCU-1

Category: Networking

Type: Installation Instructions Manual

This manual is also suitable for

Johnson Controls LN-PFCU-1 is a line powered fan coil unit controller that offers advanced control capabilities for fan coil units in commercial and residential buildings. With its wide range of input and output options, the LN-PFCU-1 can monitor and control various aspects of a fan coil unit, including temperature, humidity, fan speed, and valve position. The controller's software configurability allows for customization to meet specific application requirements, making it a versatile solution for a variety of HVAC applications.

LN Series Line Powered Fan Coil Unit Controller (PFCU) Installation

Instructions

Application Requirements

Follow these recommendations for proper installation

and subsequent operation of each controller:

• Keep the controller at room temperature for at least

24 hours prior to installation to ensure evaporation

of condensation that may have accumulated due to

low temperature during shipping.

• Properly inspect the product for shipping damage.

Do not install damaged controllers.

• Record the Neuron® ID located on both sides of

the device to commission the device later.

• Ensure proper clearance and ventilation for the

controller. Position the controller with the

ventilation slots and power supply/output terminal

block connector towards the top for safety and to

allow proper heat dissipation.

• Operate the controller under the following

conditions:

- Ambient temperature: 32 to 158°F (0 to 70°C)

- Relative humidity: 0 to 90%, noncondensing

North American Emissions Compliance

United States

Canada

Mounting

You can mount each controller on a DIN rail, in a panel,

or on a wall. The controllers are equipped with

2 mounting holes measuring 0.25 x 0.165 in.

(6.35 x 4.191 mm).

DIN Rail

To mount the controller on a DIN rail:

1. Ensure the DIN rail is properly mounted on the

wall.

2. Clip the controller onto the DIN rail.

IMPORTANT: Prevent any static electric discharge

to the controller. Static discharge can damage the

controller and void the warranties.

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.

LN Series Line Powered Fan Coil Unit Controller (PFCU)

Installation Instructions

LN-PFCUA-1, LN-PFCU-1

Code No. LIT-12011319

Issued April 24, 2014

Supersedes November 9, 2007

LN Series Line Powered Fan Coil Unit Controller (PFCU) Installation Instructions2

Wall Mount

To mount the controller on a wall:

1. Use the side clips to separate the controller’s front

and back plates.

2. Use the holes on the back plate to mark the wall

location.

3. Drill the holes.

4. Clean the surface and mount the controller using

the appropriate screws.

Location Considerations

• Ensure you have proper clearance of controller

enclosures, wiring terminals, and service pin for

easy access, hardware configuration, and

maintenance.

• Ensure proper ventilation of each controller and

avoid areas where corroding, deteriorating, or

explosive vapors, fumes, or gases may be present.

Orient each controller with the ventilation slots and

power supply/output terminal block connector

towards the top to permit proper heat dissipation.

Wiring

Follow these wiring recommendations:

• Remove the front plate from the back plate to

facilitate in the wiring process. Use a small flat

screwdriver to tighten the terminal connector

screws once the wires are inserted.

• Keep power cables apart from other types of wiring

to avoid ambient noise transmission to other wires.

• Use wires or flat cables ranging from 22 to 14

(0.644 to 1.630 mm) AWG per pole. Power cables

must remain between 18 to 14 AWG

in diameter.

• Do not connect the universal inputs, analog/digital

outputs, or common terminals to earth or to chassis

ground unless otherwise stated.

Power Wiring

Voltage: 85-265 VAC; 50-60 Hz

Maximum Consumption: 33 VA (LN-PFCUA-1),

20 VA (LN-PFCU-1)

The controller is internally fuse-protected.

Note: The power wires must be at lease 18 AWG

(1.024 mm).

Input Wiring

Each controller has physical connections for inputs that

are software configurable from within the controller’s

LNS® plug-in. Each input can be configured properly in

the software plug-in to ensure proper input readings.

Wiring Digital and Resistive 10k ohm Inputs

Use this input configuration to monitor digital dry

contacts as well as 10k ohm potentiometers and

10k ohm Negative Temperature Coefficient

(NTC)

thermistors.

CAUTION: Risk of Electric Shock.

Disconnect power supply before making

electrical connections to avoid electric

shock.

MISE EN GARDE : Risque de décharge

électrique.

Débrancher l'alimentation avant de

réaliser tout raccordement électrique afin

d'éviter tout risque de décharge

électrique.

Controller 2

Controller 1

Neutral

85-265VAC

Neutral

85-265VAC

2-Line Main

Power Disconnect

Figure 1: Power Wiring

UIx

COM

NTC Thermistor

10k

Figure 2: 10k ohm Thermistor Input

UIx

COM

Potentiometer

10k

Figure 3: 10k ohm Potentiometer

Input

UIx

COM

Digital Dry Contact

NO-NC

Figure 4: Digital Dry Contact

(NO and NC)

LN Series Line Powered Fan Coil Unit Controller (PFCU) Installation Instructions 3

Resistive 1k ohm Inputs

Figure 5 shows an input configuration used to monitor

1k ohm platinum Resistive Temperature Detector

(RTDs).

Resistive PT100 Inputs

Figure 6 shows an input configuration used to monitor

PT100 platinum RTDs.

Wiring Current Inputs

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

current input according to Figure 7 if you are using a

2- or 4-wire 20 mA transducer.

Connect the current input according to Figure 9 if the

transducer is powered by its own power source.

Wiring Voltage Inputs

Voltage inputs have a range of 0 to 10 VDC. Connect

the voltage input according to Figure 10.

Connect the voltage input according to Figure 11 if a

0 to 10 V transducer with its own power source is being

used.

Note: You can use the onboard 24 VAC output with a

DC power supply on the LN-PFCUA-1 controllers to

supply the current loop (Figure 7). It can also be used

to supply the voltages (Figure 7 and Figure 10).

Output Wiring

The LN-PFCU-1 controller has physical connections for

four relay contact outputs and four triac outputs. In

addition to these outputs, the LN-PFCUA-1 controllers

have two universal outputs. The outputs are all

software configurable.

Note: Before you connect output equipment to the

controller, refer to the installation instructions from the

equipment manufacturer.

UIx

COM

Platinum RTD

1k

Figure 5: 1k ohm Platinum RTD

Input

UIx

COM

Platinum RTD

PT100

Figure 6: PT100 Platinum RTD

Input

UIx

COM

24VDC

Resistor - 249 / ¼W

4-20mA

Transducer

Figure 7: Current Input -

2-wire Transducer

UIx

COM

Resistor - 249  / ¼W

4-20mA

Transducer

24VAC

Common

24VAC

Figure 8: Current Input - 3-wire

Transducer

Figure 9: Current Input -

Transducer with Own

Power Source

UIx

COM

Resistor - 249  / ¼W

4-20mA

Transducer

Figure 10: Voltage Input -

Transducer with own

Power Source

UIx

COM

0-10V

Tr ansducer

24VAC

Com /

24VAC

UIx

COM

0-10V

Transducer

Figure 11: Voltage Input -

Transducer with Its Own Power

Source

LN Series Line Powered Fan Coil Unit Controller (PFCU) Installation Instructions4

Wiring Relay Contact Outputs

Three relay contact outputs (DO1-DO3) can switch 3A

(inductive/resistive) for fan speed control up to

277 VAC, and one relay contact output (DO4) can

switch 3A (inductive) and 10A (resistive) for heater

control up to 277 VAC. When wiring:

• relay contact output cables must remain between

18 and 14 AWG. Select the proper gauge

according to the current load.

• all digital relay contact outputs on LN-PFCU

controllers are normally open

• there is no voltage present on the digital output

terminals so use an external power supply

• it is recommended to use a 4A fast-acting,

high-breaking fuse to protect the relay contact

outputs (DO1-DO3) and a 15A fast-acting,

high-breaking fuse to protect the relay contact

output (DO4) against short circuiting when using

high voltage

Wiring Triac Outputs

The four triac outputs can switch 1A at 20.4 to 265 VAC

and can be used to turn the equipment and devices on

and off (two-state outputs) and to control valve and

damper actuators using stroke time or Pulse Width

Modulation (PWM). When wiring:

• use triac output cables between 20 and 18 AWG.

They must be at least 18 AWG if they are switching

high voltage.

• connect an external load to measure the state of a

triac output

• use a 4A fast-acting, high-breaking fuse to protect

the triac outputs against short circuiting when using

high voltage

• it is not necessary to use a fuse when the onboard

24 VAC output is being used with the triac outputs

since it already has built-in circuit protection

• the triac outputs work in pairs (DO5-DO6 and

DO7-DO8) and does work not with two different

voltages (for example, DO5-DO6 switch high

voltage [85 to 256 VAC] and DO7-DO8 switch the

onboard 24 VAC).

DO4

2-Line Main

Power Disconnect

Fuse

Reheat

DO3

DO1

DO2

C1-2-3

Fan

Fuse

LOW

MED

HIGH

Figure 12: Relay Contact Output -

Fan and Floating Actuator Powered

by External 85-265 VAC Power

Supply

2-Line Main

Power Disconnect

Fuse

DOx

Cx-x

DOx

Relay

Figure 13: Triac Output - Relay Powered by

External 85-265VAC Power Supply

DOx

Cx-x

Heat

DOx

24VAC OUT

COM

Figure 14: Triac Output - Floating

Actuator Powered by Onboard

24 VAC Power Supply

2-Line Main

Power Disconnect

Fuse

DOx

Cx-x

DOx

Heat

Figure 15: Triac Output -

Floating Actuator Powered by

External 85-265 VAC

Power Supply

LN Series Line Powered Fan Coil Unit Controller (PFCU) Installation Instructions 5

Wiring Universal Outputs

You can configure universal outputs to provide either a

linear signal ranging from 0 to 10 VDC or a discrete

signal of 0 to 12 VDC. You can use the discrete signal

to generate a Pulse Wave Modulation (PWM) or a

simple two-state signal. The Analog output cables

should be between 22 and 18 AWG.

You must connect a diode in parallel when controlling a

relay with a universal output to protect the controller

from back-emf current, which occurs when the relay is

turned off. Use diodes that are part of the 1N400x

family, and place them closer to the relay.

Onboard 24 VAC Output Specifications

Voltage: 24 VAC; ±15%; 55 Hz

Maximum Consumption: 300 mA (7.2 VA) @ 24 VAC

Note: A short circuit between the 24 VAC OUT and

COMM resets the controller periodically

(every 2 seconds).

Communications Wiring

The recommended cable type for LONWORKS®

communications is 22 AWG (0.65 mm), twisted pair,

unshielded. The LON communication wire is polarity

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

free topology. For the loop topology, polarity is

important, so take special care when connecting the

LON network to avoid a short circuit.

Note: Use the bus topology network configuration for

all LON communication wiring. It allows you to

troubleshoot the network easily.

Connect both wires to the LON 1 or 2 terminals of the

controller. When you insert multiple wires into the

terminals, ensure you properly twist the wires together

prior to inserting them into the terminal connectors.

For more information and detailed explanations on

network topology and wire length restrictions, please

refer to the Junction Box and Wiring Guideline for

Twisted Pair L

ONWORKS® Networks.

Two network terminators are required for the bus

topology network configuration: one at each end of the

bus topology channel.

One network terminator is required for the free

topology network configuration. You can put the

network terminator anywhere on the channel.

Memory Erase Jumper

Each controller features a memory erase jumper. Use

the memory erase jumper to erase the Neuron chip’s

memory. If an incorrect APB or NXE file is loaded into

the controller, the Neuron chip’s memory corrupts, and

no communication with the controller is possible. Use

the memory erase jumper to correct this problem by

resetting the Neuron chip’s memory; the chip is then in

an application-less state. The memory erase jumper is

labeled J5 on the LN-PFCU controllers.

IMPORTANT: Do not connect the 24 VAC OUT to

UIx or UOx.

UO9

24VAC OUT

COM

UO10

Heat

Cool

Figure 16: 0 to 10 VDC Analog

Output

UO9

24VAC OUT

COM

UO10

12VDC Relay

Figure 17: 0 or 12 VDC Discrete Output

IMPORTANT: Use the proper network terminators

for the network topology. Failure to use the correct

network terminators may result in communication

errors between controllers. Do not use multiple

gauges of cable on the same communication bus.

Controller 2

Controller 1

LON1

LON2

LON Network

LON1

LON2

Figure 18: Communications Wiring

LN Series Line Powered Fan Coil Unit Controller (PFCU) Installation Instructions6

To erase the Neuron chip’s memory using the memory

erase jumper, do the following:

1. Disconnect the power to the controller.

2. Place a jumper on the proper pins on the controller.

3. Reconnect power to the controller.

Note: The orange colored service Light-Emitting

Diode (LED) blinks rapidly indicating that it is erasing

the Neuron chip’s memory. When the service LED

stops blinking and remains solid, the erase procedure

is complete.

Note: The erase procedure normally takes between 2

and 10 seconds to 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. Download the correct APB file.

Note: You must use the Load or Commission option in

LN-Builder 3 if the controller already exists in the LNS

database to download the APB file. Do not use the

Replace option.

Strain Relief and Terminal Block Cover

Note: Strain reliefs are mandatory if the controller is

installed outside of a fan coil unit or an electrical

cabinet.

In certain jurisdictions, terminal block covers are

required to meet local safety regulations. Strain reliefs

and terminal block covers are available for controllers

housed in the large enclosures and are used to relieve

tension on the wiring and conceal the controllers’ wire

terminals. Strain reliefs and terminal block covers are

optional and are sold separately.

Prior to connecting all wires, install the strain relief.

Three screws are provided for its installation under the

bottom part of the enclosure. You can then use tie

wraps to group wires together and attach them

securely to the strain relief to relieve undue tension. If

necessary, clip the terminal block cover on to the strain

relief as shown in Figure 20.

Figure 19: Memory Erase Jumper Location (J5)

Figure 20: Large Enclosure Strain Relief and

Terminal Block Cover Installation

LN Series Line Powered Fan Coil Unit Controller (PFCU) Installation Instructions7

Maintenance

Each controller requires minimal maintenance, but it is

important to:

• clean the outside of the front plate and/or the inside

of the back plate, using a dry cloth

• verify the tension of all wires and cables each time

you service the controller

Disposal

The Waste Electrical and Electronic Equipment

(WEEE) Directive sets regulations for the recycling and

disposal of products. The WEEE2002/96/EG Directive

applies to stand-alone products that can function 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, they

are marked with the WEEE symbol, indicating the

devices are not disposed of with municipal waste.

Dispose of products at the end of their useful life

according to local regulations and the WEEE Directive.

CAUTION: Risk of Electric Shock.

Disconnect power supply before making

electrical connections to avoid electric

shock.

MISE EN GARDE : Risque de décharge

électrique.

Débrancher l'alimentation avant de

réaliser tout raccordement électrique afin

d'éviter tout risque de décharge

électrique.

LN Series Line Powered Fan Coil Unit Controller (PFCU) Installation Instructions8

Figure 21: Wiring Diagram - Typical Fan Coil Application

LN Series Line Powered Fan Coil Unit Controller (PFCU) Installation Instructions9

Troubleshooting

Table 1 describes some troubleshooting scenarios.

Table 1: Troubleshooting (Part 1 of 2)

Problem Possible Solution

Controller is powered but does not turn on.

Fuse Is Blown Check the fuse integrity. If the fuse has blown perform the following:

1. Turn off power from the controller.

2. Remove the front plate of the controller. The fuse is located close to

the power terminals.

3. Replace the fuse with a 2A fast-acting high-breaking capacity fuse

(1500 A at 250 VAC). Dimensions: 5 x 20.

4. Reattach the front plate to the controller.

Controller cannot communicate on a FTT network.

Absent or Incorrect Supply Voltage 1. Check power supply voltage between 24 VAC/DC ±15% and COM

pins, and ensure that it is between acceptable limits.

2. Check for tripped fuse or circuit breaker.

Network Not Wired Properly Double-check the wire connections are correct.

Absent or Incorrect Network

Termination

Check the network terminations.

Incorrect APB File Has Been

Downloaded

Use the memory erase jumper to reset the Neuron chip’s memory, then

load the proper APB into the controller using LN-Builder 3 or another

network management tool.

Service Pin Not Working

Controller communicates well over a short network but does not communicate on large network.

Network Length Check that the total wire length does not exceed the specifications of the

Junction Box and Wiring Guideline for Twisted Pair LONWORKS

Networks

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

Junction Box

and Wiring Guideline for Twisted Pair L

ONWORKS Networks.

Network wiring problem Double-check that the wire connections are correct.

Absent or Incorrect Network

Termination

Check the termination(s). Incorrect or broken termination(s) make the

communication integrity dependent upon a controller's position on the

network.

Extra Capacitance Ensure no extra capacitance is connected to the network other than the

standard FTT circuit, and a maximum of a 3 meter stub (in bus topology).

Number of Devices On Network

Segment Exceeded

Do not exceed 64 controllers on a channel. Use a router or a repeater in

accordance to the

Junction Box and Wiring Guideline for Twisted Pair

ONWORKS Networks.

Network Traffic Query node statistic to check 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.

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

LN Series Line Powered Fan Coil Unit Controller (PFCU) Installation Instructions10

Metasys® is a registered trademark of Johnson Controls, Inc.

All other marks herein are the marks of their respective owners.

Controls Group

507 E. Michigan Street

Milwaukee, WI 53202

Service Light Emitting Diode (LED) Operation Guide

Repair Information

If the LN Series Powered Fan Coil Unit controller fail to

operate within its specifications, replace the unit. For a

replacement controller, contact the nearest

Johnson Controls representative.

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

(0 V) and Open circuit (5 V).

Configuration Problem Using the controller configuration plug-in or wizard, check the

configuration of the input. Refer to the controller

’s user guide for more

information.

Hardware output is not operating correctly.

Output Wiring Problem Check that the wiring is correct according to this document and

according to the peripheral device's manufacturer.

Configuration Problem Using the controller configuration plug-in or wizard, check the

configuration of the input. Refer to the controller

’s user guide for more

information.

Table 2: Service LED Operation Guide (orange color)

Operation Service

Off The controller is in normal operation or not powered. If the controller is

powered and the LED is off, press the Service pin to light up the LED.

On The controller is application-less.

Appropriate action: reload the APB file.

Slow Blink

(1 second On, 1 second Off)

The controller is unconfigured.

Appropriate action: commission the controller.

Fast Blink

(0.3 seconds On, 1 second Off)

Watchdog time-out. Application corrupted.

Appropriate action: use the memory erase jumper to reset the Neuron

chip’s memory, then load the proper APB or NXE into the controller using

LN-Builder 3 or another network management tool.

Table 1: Troubleshooting (Part 2 of 2)

Problem Possible Solution

Johnson Controls LN-PFCU-1 Installation Instructions Manual

Brand: Johnson Controls

Model: LN-PFCU-1

Category: Networking

Type: Installation Instructions Manual

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Johnson Controls LN-PFCU-1 Installation Instructions Manual

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