Johnson Controls LN-IO -1 Series User Manual

LN Series Free Programmable LN-PRGxxx-12 Controllers Installation Instructions4
Power Wiring
We recommend wiring only one controller per 24 VAC
transformer. When only one transformer is available,
determine the maximum number of controllers that can
be supplied using the following method for calculating
the required power transformer capacity:
1. Add up the maximum power consumption of all
controllers, including external loads, and multiply
this sum by 1.3.
2. If the resulting number is higher than 100 VA, use
multiple transformers.
Use an external fuse on the 24 VAC/DC side
(secondary side) of the transformer to protect all
controllers against power link spikes (Figure 3 and
Figure 4).
Note: Connecting the power source to an electrical
system ground is not a requirement for proper system
operation. However, it is a good installation practice in
order to maintain the same potential between all
controllers and Protective Earth.
Configuration Jumper Location and
Identification
Controllers have the following onsite configurable
jumpers.
IMPORTANT: Voltage: 24 VAC/DC; +
15%, Class 2.
This is a Class 2 Product. Use a Class 2 transformer
only (rated at 100 VA or less at 24 VAC) to power the
controller.
IMPORTANT: Maintain consistent polarity when
you connect the controllers and devices to the
transformer.
Figure 3: Power Wiring - DC
Figure 4: Power Wiring - AC
IMPORTANT: Connect the COM terminal of each
controller and each peripheral to the same terminal
on the secondary side of the transformer. One
terminal on the secondary side of the transformer
must be connected to the building’s ground. Failure
to maintain consistent polarity throughout the entire
network will result in a short circuit and damage to
the controller.
IMPORTANT: The COM terminals of the controller
are internally wired to the 24 V 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.
Figure 5: LN-PRG203-12 Controller Jumper
Locations
* Factory-
default position
Subnet
Port
Wireless
Port
Net to Subnet Settings
Enabled Disabled*

Johnson Controls LN-IO -1 Series Specifications

General

Brand	Johnson Controls
Model	LN-IO -1 Series
Category	Controller
Language	English