Installation Instructions
Issue Date September 1, 200
Supersedes December 1, 2004
LN Series Sensors
9
Application Requirements
The LN Series Sensor analog wall sensor family is
specifically designed to interface with fan coil, heat
pump, rooftop and other terminal unit building
automation controls. The units provide precise indoor
local temperature sensing. Local setpoint adjustment
with various scales is available.
The modern, attractive, low profile enclosure is
suitable for classrooms, hotels, executive areas, office
spaces, and other commercial areas.
Mounting
Location Consideration
Install the sensor away from any heat source.
Do not install the sensor:
• on an outside wall
• near an air discharge grill
• in a location affected by direct sun radiation
• in a location that restrains vertical air circulation to
the thermostat
Installation
Note: Wall surface must be flat and clean.
1. Remove security screw on the bottom of
thermostat cover.
2. Pull the bottom side of thermostat to open
(Figure 1).
3. Pull cables 6 inches out of the wall.
4. Insert cable in the central hole of the base.
5. Align the base and mark the location of the two
mounting holes on the wall. Install proper side of
base up.
6. Install anchors in the wall.
7. Insert screws in mounting holes on each side of
the base. Do not overtighten.
8. Strip each wire 1/4 inch.
9. Insert each wire ac cording t o wiring di agram.
10. Gently push excess wiring back into the hole in wall.
11. Press printed circuit board into place.
12. Install the cover, top side.
13. Install security screw.
Wall Anchor
Pull on plastic tab
to release the
printed circuit board
Figure 1: LN Series Sensor
© 2009 Johnson Controls, Inc.
Flip printed circuit
board to access
mounting hole
Figure 2: Sensor Installation
Security Screw
Code No. LIT-1201871 www.johnsoncontrols.com
1
Wiring
Figure 3 shows the terminals. Generic Sensor wiring is
in Figure 4; please check Table 1 and Table 2 to verify
models.
CN1
CN2
1
2
3
4
5
6
1
2
Normally open
Momentarily closed
Override button
7
8
1/8 inch L
10K type 2 NTC thermistor
5% precision
10K DA setpoint potentiometer
20% tolerance
Resistance increases on CW
rotation
24 Vac / Vdc externally powered LED
for occupied / unoccupied system
ONWORKS Network Port Connnection
status
LONWORKS Network Terminals 1-2 TP-FT10
or Smart Sensor +/- remote connection via
L
ONWORKS Network Port
Figure 3: Terminals
Table 1: Sensor Functions
Part Number Sensor Temperature
Override
LN-SENSOR-0
LN-SENSLO-0
LN-SENOCW-0
LN-SENOSC-0
LN-SENOSF-0
X 1, 2, 7, 8
X X 1, 2, 5, 6, 7, 8
X X X 1, 2, 3, 4, 5, 6, 7, 8
X X X 1, 2, 3, 4, 5, 6, 7, 8
X X X 1, 2, 3, 4, 5, 6, 7, 8
± Scale
3
4
Figure 4: Sensor Wiring
C. Scale F. Scale Terminals
2 LN Series Sensors Installation Instructions