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Johnson Controls LN Series - User Manual

Johnson Controls LN Series
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LN Series Free Programmable LN-PRGxxx-12 Controllers Installation Instructions 1
Applications
The LN Series Free Programmable LN-PRGxxx-12
Controllers are microprocessor-based and designed to
control various building automation systems, such as
multi-zone air handing units, lighting control, central
plant applications, and power measurement
applications.
The LN Free Programmable Controllers are built on a
similar platform, but have different numbers of inputs
and outputs. The LN PRG6x0-12 controllers are
compatible with the LN Input/Output (I/O) Extension
Module 400 Series models. For more information on
LN I/O Extension Modules, refer to LN Series Input/
Output (I/O) Extension Modules Installation Instructions
(LIT-12011693).
The LN Free Programmable Controllers use the
L
ONWORKS® communication protocol.
Follow these recommendations for proper installation
and subsequent operation of each controller:
Inspect the controller for shipping damages. Do no
t
ins
tall damaged controllers.
Keep the controller at room temperature for at leas
t
2
4 hours prior to installation to allow an
y
con
densation that may have accumulated during
shipping to evaporate.
If the controller is used in a manner not specifie
d
by
Johnson Controls, the functionality and th
e
pr
otection provided by the controller may become
impaired.
Record the 12-digit Neuron® ID located on either
end of the device (shown on the sticker below th
e
b
arcode) for commissioning.
Note: The controller’s plastic enclosure has a
back plate that is separate from the front plate
allowing the back plates to be shipped directly
to
the ins
tallation site while all the engineering is done
elsewhere.
North American Emissions Compliance
Canada
United States
Installation
Observe these guidelines when installing an LN Free
Programmable Controller:
Transport the controller in the original container to
minimize vibration and shock damage.
Verify that all parts shipped with the controller.
Do not drop the controller or subject it to ph
ysical
shock.
IMPO
RTANT: Prevent any static electric discharge
to the controller. Static discharge can damage the
controller and void the warranties.
Industry Canada Statement
The term IC before the certification/registration
number only signifies that the Industry Canada
technical specifications were met.
Le terme « IC » précédant le numéro d'accréditation/
inscription signifie simplement que le produit est
conforme aux spécifications techniques d'Industry
Canada.
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.
LN Series Free Programmable LN-PRGxxx-12 Controllers
Installation Instructions
LN-PRG203-12, LN-PRG300-12,
LN-PRG4x0-12, LN-PRG6x0-12
Code No. LIT-12011796
Issued April 24, 2014
Supersedes January 30, 3013

Questions and Answers

  • G
    gardnerbethAug 29, 2025
    How to check network length of Johnson Controls Controller?
    • J
      Jennifer BurgessAug 29, 2025
      To address network length issues in your Johnson Controls Controller, check that the total wire length does not exceed the specifications of the LONWORKS LN-Series Network Communication and Interface Guide Technical Bulletin (LIT-12011253).
  • J
    Jennifer PerezAug 30, 2025
    How to check wire type in Johnson Controls LN Controller?
    • M
      Melissa ArnoldAug 30, 2025
      To check the wire type for your Johnson Controls Controller, ensure it agrees with the specification of the LONWORKS LN- Series Network Communications and Interface Guide Technical Bulletin (LIT- 1201253) or Junction Box and Wiring Guideline for Twisted Pair LONWORKS Networks.
  • K
    Karla MeltonAug 30, 2025
    How to check wire type of Johnson Controls Controller?
    • J
      Janet TorresAug 30, 2025
      To check the wire type for your Johnson Controls Controller, ensure that the total wire type agrees with the specification of the LONWORKS LN-Series Network Communication and Interface Guide Technical Bulletin (LIT-12011253).
  • E
    Edward PetersenAug 25, 2025
    What to do if there is absent or incorrect supply voltage in Johnson Controls LN Controller?
    • B
      barreradarrenAug 25, 2025
      If you have absent or incorrect supply voltage in your Johnson Controls Controller: 1. Check the power supply voltage between the 24 VAC/DC ±15% and COM pins, ensuring it's within acceptable limits. 2. Check for a tripped fuse or circuit breaker.
  • T
    Tracy SantosSep 1, 2025
    How to check network traffic on Johnson Controls Controller?
    • K
      katiebaldwinSep 1, 2025
      To analyze network traffic issues with your Johnson Controls Controller, query node statistics to check for errors. You can also use a LONWORKS protocol analyzer to check network traffic.
  • S
    Stacy HarrisonSep 1, 2025
    What to do if there is another controller with the same Subnet ID on the subnetwork for Johnson Controls LN Controller?
    • K
      Kayla YoungSep 1, 2025
      If there is another controller with the same Subnet ID on the subnetwork of your Johnson Controls Controller, remember that each I/O Extension Module on the subnetwork must have a unique Subnet ID. Look at the Subnet ID DIP switch on the faceplate of each I/O Extension Module.
  • K
    Kevin BradshawSep 2, 2025
    How to troubleshoot open circuit or short circuit in Johnson Controls LN?
    • S
      sbrownSep 2, 2025
      To troubleshoot an open or short circuit in your Johnson Controls Controller, use a voltmeter to check the voltage on the input terminal. A short circuit will have a 0 V value, while an open circuit will have a 5 V value.
  • K
    Kenneth YoungSep 3, 2025
    What to do if input wiring problem in Johnson Controls LN?
    • M
      Mrs. Andrea SchneiderSep 3, 2025
      If you are experiencing an input wiring problem with your Johnson Controls Controller, check that the wiring is correct according to this manual and according to the peripheral device's manufacturer.
  • E
    Edward HatfieldSep 3, 2025
    What to do if output wiring problem in Johnson Controls LN Controller?
    • M
      Margaret WoodsSep 4, 2025
      If you are experiencing an output wiring problem with your Johnson Controls Controller, check that the wiring is correct according to this manual and according to the peripheral device's manufacturer.
  • W
    William HortonSep 4, 2025
    How to solve configuration problem in Johnson Controls LN?
    • T
      Tyler BairdSep 4, 2025
      To address a configuration problem with the input on your Johnson Controls Controller, use the controller configuration wizard (LN-GPI) to check the input's configuration. Refer to the controller's user guide for more information.

Johnson Controls LN Series Specifications

General IconGeneral
BrandJohnson Controls
ModelLN Series
CategoryController
LanguageEnglish

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