Johnson Controls LN Series Sensors Installation Guide

Installation Instructions Issue Date September 1, 200 Supersedes December 1, 2004
LN Series Sensors

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
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