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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

  • C
    Cassie MendozaSep 23, 2025
    Why over-voltage or over-current at an input can affect Johnson Controls LN?
    • J
      Jacob BaldwinSep 23, 2025
      If you are experiencing issues related to over-voltage or over-current at an input of your Johnson Controls Controller, be aware that an over-voltage or over-current at one input can affect the reading of other inputs. Respect the allowed voltage/current range limits of all inputs.
  • E
    Erica MaysSep 23, 2025
    What to do if the temperature setpoint is not read properly on Johnson Controls Accessories?
    • A
      amanda05Sep 23, 2025
      If the temperature setpoint is not being read correctly, there are a couple of things to check: * First, ensure that all connections are properly wired. * Second, make sure that the setpoint is configured correctly in the software, especially in relation to the selected sensor model.
  • C
    colonhunterAug 31, 2025
    What to do if number of devices on network segment exceeded on Johnson Controls Controller?
    • J
      Jacqueline TorresAug 31, 2025
      If the number of devices on the network segment has been exceeded on your Johnson Controls Controller, remember that the number of controllers on a channel should never exceed 64. Use a router or a repeater in accordance with LONWORKS LN-Series Network Communications and Interface Guide Technical Bulletin (LIT-1201253) or Junction Box and Wiring Guideline for Twisted Pair LONWORKS Networks.
  • C
    Carrie GarrettAug 25, 2025
    What to do if fuse has blown (auto reset fuse) in Johnson Controls LN Controller?
    • B
      Brian ParkerAug 25, 2025
      If the auto-reset fuse has blown in your Johnson Controls Controller, disconnect the power and output terminals. Wait a few seconds to allow the fuse to cool down. Check the power supply and output wiring if necessary.
  • D
    David ChaneyAug 25, 2025
    Why is the power transformer overloaded in Johnson Controls LN?
    • A
      Anthony GibsonAug 26, 2025
      If you suspect the power transformer is overloaded in your Johnson Controls Controller, verify that the transformer is powerful enough to supply all controllers.
  • J
    Jamie MaddoxAug 26, 2025
    How to check power supply polarity in Johnson Controls LN Controller?
    • A
      Adam FosterAug 26, 2025
      To address power supply polarity issues with your Johnson Controls Controller, verify that consistent polarity is maintained between all controllers and the transformer. Make sure that the COM terminal of each controller is connected to the same terminal on the secondary side of the transformer.
  • P
    Patrick CarterAug 27, 2025
    What to do if network not wired properly in Johnson Controls LN Controller?
    • D
      David JimenezAug 27, 2025
      If the network is not wired properly in your Johnson Controls Controller, check that the wire connections are correct.
  • J
    Jeremy GrimesAug 27, 2025
    How to troubleshoot network wiring problem in Johnson Controls Controller?
    • M
      michellegillAug 27, 2025
      If you are experiencing a network wiring problem with your Johnson Controls Controller, check that the wire connections are correct.
  • S
    sean97Aug 27, 2025
    How to check for absent or incorrect network termination in Johnson Controls Controller?
    • M
      Michael NicholsonAug 28, 2025
      If there is absent or incorrect network termination in your Johnson Controls Controller, check the network terminations.
  • M
    Melanie TaylorAug 28, 2025
    How to check network length in Johnson Controls LN?
    • M
      Matthew WebsterAug 28, 2025
      To address network length issues in your Johnson Controls Controller, check that the total wire length does not exceed the specifications outlined in the Junction Box and Wiring Guideline for Twisted Pair LONWORKS Networks.

Johnson Controls LN Series Specifications

General IconGeneral
BrandJohnson Controls
ModelLN Series
CategoryController
LanguageEnglish

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