Johnson Controls LN Series User manual

LN Series LN-VSTAT and LN-PSTAT Sensors Installation Instructions 1
Applications
The LN Series LN-VSTAT and LN-PSTAT sensors are
specifically designed to connect to the SMRT ports of
the Johnson Controls’ LN Series controllers. The
LN-VSTAT-1 works with the LN-VAVFLFS-1 and
LN-VVTLFS-1 controllers. The LN PSTAT-1 works with
the LN-PFCU-1 and LN-PFCUA-1 controllers. The
SMRT ports supply power and serial communications
to the LN-VSTAT and LN-PSTAT sensors. The device
provides precision local temperature sensing and it
allows occupants to adjust the local setpoint and view
the occupancy status, local space temperature, and
outside air temperature.
North American Emissions Compliance
United States
Canada
Installation
For proper installation and subsequent operation of the
LN-VSTAT and LN-PSTAT sensors, follow these
recommendations:
• Allow for proper clearance of device casing and
wiring terminals for easy access, hardware
configuration, and maintenance.
• The sensor is designed to operate under the
following conditions:
• Ambient temperature between 32º to 158ºF
(Oº to 70ºC)
• Relative humidity from 0% to 95%,
non-condensing
• Ensure proper ventilation of devices and avoid
areas where corroding, deteriorating, or explosive
vapors, fumes, or gasses may be present.
IMPORTANT: Work in a static-free area. 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.
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.
To comply with FCC RF exposure requirements for mobile
transmitting devices, this transmitter should only be used
or installed at locations where there is at least 20cm
separation distance between the antenna and all persons.
Industry Canada Statement
This Class (A) digital apparatus meets all the requirements
of the Canadian Interference-Causing Equipment
Regulations.
Le terme «IC» précédant le numéro de d'accréditation/
inscription signifie simplement que le produit est conforme
aux spécifications techniques d'Industry Canada.
LN Series LN-VSTAT and LN-PSTAT Sensors
Installation Instructions
LN-VSTAT-1, LN-PSTAT-1 Code No. LIT-12011302
Issued November 9, 2007
Supersedes May 2, 2007

LN Series LN-VSTAT and LN-PSTAT Sensors Installation Instructions2
Dimensions
Mounting
Location Considerations
The LN-VAV/VVT controllers are designed for easy
installation. However, certain conditions apply when
choosing a location for the device:
• The LN-VSTAT and LN-PSTAT sensors should not
be installed on an outside wall
• Install the sensor away from any heat source
• Install the sensor away from discharge air grills
• Install the sensor away from areas where it can be
affected by the sun
• Install the sensor in an area that provides proper
device ventilation. Ensure nothing restrains air
circulation to the sensor.
Note: The LN-VSTAT and LN-PSTAT sensors are not
designed for outdoor use.
Figure 1: LN-VAVLF, LN-VAVCF, and LN-VVTLF Controller Dimensions

LN Series LN-VSTAT and LN-PSTAT Sensors Installation Instructions 3
Installation
1. Unscrew the security screw on the bottom of the
casing (Figure 2).
2. Open the cover by pulling the bottom side of the
casing outwards. Flip printed circuit board to
access mounting hole.
3. Pull cables 6 in. out of the wall and insert them in
the central hole of the base.
4. Align the base and mark the location of the two
mounting holes on the wall. Ensure the correct side
of the base is facing upwards.
5. Remove the device and drill holes, if necessary.
6. Install anchors into the wall, if necessary.
7. Ensure the mounting surface is flat and clean.
8. Insert screws in mounting holes of the base. Do not
overtighten the screws.
9. Strip each wire 1/4 in.
10. Gently push excess wiring back into the wall.
11. Flip the printed circuit board back into place.
12. .Flip down the front cover verify it clips tightly into
place.
13. Install the security screw (Figure 3).
FIG:mntng_bs
Figure 2: Mounting the LN-VSTAT and
LN-PSTAT sensors
Figure 3: LN-VSTAT and LN-PSTAT Sensors
Security Screw

LN Series LN-VSTAT and LN-PSTAT Sensors Installation Instructions4
Wiring
IMPORTANT: Make all wiring connections in
accordance with the National Electrical Code and all
local regulations. Use Copper conductors only. Do not
exceed the control’s electrical rating.
The LN-VSTAT and LN-PSTAT sensors draw power
and communicate with the associated controller over
the SMRT wiring using a serial communication protocol.
Figure 4 shows the terminal wiring details.)
Wiring the LN-VSTAT and LN-PSTAT Sensors
to a Controller
The LN-VSTAT and LN-PSTAT sensors use a serial
communication protocol and are designed to connect to
the serial inputs labelled SMRT+ and SMRT- on the
LN-VAVLF and LN-VVTLF controller.
Note: The LN-VAVCF controller does not support the
LN-VSTAT and LN-PSTAT sensors.
To wire a wall mounted LN-VAV/VVT controller:
1. Remove the faceplate.
2. Use a screwdriver to press down the tabs located
on the bottom of the sensor to remove the cover.
!
CAUTION: Risk of Electric Shock.
Disconnect power supply before making
electrical connections to avoid shock.
SMRT-
SMRT+
LON (Optional) LON (Optional)
1/8" Com.
Jack 1234
Figure 4: LN-VSTAT and LN-PSTAT Sensors
Terminal Wiring Details
Figure 5: SMRT+ and SMRT- Output Terminal
Location

LN Series LN-VSTAT and LN-PSTAT Sensors Installation Instructions 5
3. Connect the SMRT+ and SMRT- output terminals
of the LN-VSTAT to the SMRT+ and SMRT- input
terminals on the LN-VAV/VVT controller (Figure 6).
Using the LN-VSTAT as a Portable Device
You can use the LN-VSTAT sensors as a portable
device to perform VAV balancing. If an LN-Sensor is
already connected to the VAV that you intend to
balance, directly connect the LN-VSTAT to the
communication jack within the LN Series Sensor.
Note: Terminals 1 and 2 of the right most terminal
block within the LN Sensor must be connected to the
SMRT+ and SMRT- inputs of the VAV controller before
you can use the communication jack. Typically, these
connections should have been made when the VAV
controller and LN Sensor were first installed.
To connect the LN-VSTAT sensors to an LN-Sensor
using an 1/8 in. mono or stereo audio cable:
1. Use the taps on the bottom of thesensor to remove
the sensor face plate.
2. Connect the SMRT+ and SMRT- output terminals
of the LN-VSTAT sensors to two wires that
terminate in the 1/8 in. audio plug (Figure 7).
3. Remove the LN Sensor faceplate and insert the 1/8
in. audio plug into the communication jack. Ensure
the two output terminals on the right side of the
LN-Sensor are wired to the SMRT+ and SMRT-
terminals of the LN-Sensor (Figure 8).
Figure 6: LN-VSTAT and LN-PSTAT Sensors -
Wired to Controller
LN-VAV LN-VSTAT
Figure 7: SMRT+ and SMRT- Output Terminals
with Audio Plug

LN Series LN-VSTAT and LN-PSTAT Sensors Installation Instructions6
Connect 1/8 in. Audio Plug
from LN-VSTAT Sensor
Figure 8: LN Sensor Wiring
LN-VAV LN Sensor LN-VSTAT
Figure 9: LN-VSTAT and LN-PSTAT sensors Wired
to LN Sensor Using an Audio Plug

LN Series LN-VSTAT and LN-PSTAT Sensors Installation Instructions7
Communications Wiring
You can optionally wire Terminals 3 and 4 of the
LN-VSTAT and LN-PSTAT sensors to the LON
terminals of the controller. Before you insert multiple
wires into any of the terminals on the controller, ensure
you properly twist the wires together.
You can access the LON network with a laptop by
plugging into the communications jack on the
LN-VSTAT with a 1/8 in. audio plug.
Approved cable types for LON communication is Level
IV 22 AWG (0.65 mm), UNSHIELDED. You can use
both one pair and two pair wires. The LON
communication wire is not polarity sensitive and can be
laid out in a bus, star, loop, or free topology network
configuration. For loop topology, polarity is important,
take special care when connecting the LON network to
avoid a short circuit.
Note: The LN-VSTAT and LN-PSTAT sensors do not
have an effect on the network topology for LON
networks.
Note: The Bus topology network configuration allow
for easy network troubleshooting for LON
communication wiring.
Topology Wiring Choices
If the distance between the sensor and the controller
(stub length) is less than 3 meters a bus topology must
be used (Figure 11). If the stub length is greater than 3
meters, a free topology in a daisy-chain manner must
be used (Figure 12).
Note: In Figure 11 and Figure 12, the wire runs from
the two communication terminals of the LN-VSTAT and
LN-PSTAT sensors to the LON/NET terminals of a
controller. When you insert multiple wires into the
terminals, ensure you properly twist the wires together
prior to inserting them into the terminal connectors.
Figure 10: LN-Sensor to an LN-PSTAT Sensor Wiring Details
SMRT+ SMRT-
165432
+--++-
INPUT+
COM
INPUT+
OUTPUT+
(0-10 VDC or 24 VAC)
Com .1Com.2
TO SMRT+ TO SMRT-
OUTPUT-
LN-- SENSOR LN- PSTAT

LN Series LN-VSTAT and LN-PSTAT Sensors Installation Instructions8
Figure 11 shows a bus topology (wired in a daisy chain)
with stub length of less than 3 meters.
Figure 12 shows free topology (with stub) wired in
daisy chain manner.
The wiring scheme in figure is almost identical to a bus
topology network, but since the stub length exceeds 3
meters, it becomes a free topology network which
requires a free topology terminator.
CONTROLLER CONTROLLER CONTROLLER
Bus
Topology
Terminator
Stub Length
< 3 m
Bus
Topology
Terminator
Figure 11: Bus Topology, Stub < 3m
CONTROLLER CONTROLLER CONTROLLER
Free
Topology
Terminator
Stub Length
> 3 m
Figure 12: Free Topology, Stub > 3m

Published in U.S.A. www.johnsoncontrols.com
LN Series LN-VSTAT and LN-PSTAT Sensors Installation Instructions 9
Controls Group
507 E. Michigan Street
Milwaukee, WI 53202
Metasys® is a registered trademark of Johnson Controls, Inc.
All other marks herein are the marks of their respective owners.
© 2007 Johnson Controls, Inc.
For additional information and detailed explanations on
network topology and wire length restrictions, refer to
Echelon Corporation’s Junction Box and Wiring
Guideline for Twisted Pair LONWORKS Networks
(Part # 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.
Troubleshooting
Table 1: Troubleshooting
Problem Possible Cause Solution
Temperature is not read
properly Wrong connection Verify that every connection is properly wired.
Temperature setpoint is not
read properly
Wrong connection Verify that every connection is properly wired.
Software configuration Verify that the setpoint is configured correctly according to
the selected sensor model.