COMMERCIAL UNITS
KITS AND ACCESSORIES
E2018 Lennox Industries Inc.
Dallas, Texas, USA
504,603M
1/2018
Supersedes 11/2016
INDOOR REMOTE SENSORS
INSTALLATION INSTRUCTIONS FOR INDOOR REMOTE TEMPERATURE SENSORS
— 10K OHM (47W37) AND 20K OHM (47W36)
Electrical Wiring Practices
WARNING
Improper installation, adjustment, alteration, service or
maintenance can cause property damage, personal inju
ry or loss of life.
Installation and service must be performed by a licensed
professional HVAC installer (or equivalent) or service
agency.
When the remote indoor sensor is installed with a
commercial touch screen thermostat, use these
instructions to install the sensor. Also see the touch screen
instructions for more on wiring the sensor to the
thermostat.
PRE-INSTALLATION
Cover Removal
A snap-fit locking mechanism is used to attach the cover of
the remote indoor sensor to its sub-base. To remove the
cover from the sub-base:
1. Insert a thin, flat blade screwdriver into each of the two
slots at the bottom of the module to release the two
locking tabs (see figure 1).
LOCKING TAB
SLOTS (2)
Erratic System Operation Hazard.
Failure to follow proper wiring practices can introduce
disruptive electrical interference (noise).
All wiring must comply with local electrical codes and
ordinances, or as specified on installation wiring
diagrams.
Typical Commercial Touch Screen Thermostats
The following items are recommended for indoor remote
sensor installations:
1. Keep wiring at least one foot away from large inductive
loads such as motors, line starters, lighting ballasts,
and large power distribution panels.
2. Shielded cable is required in installations where these
guidelines cannot be met.
3. Ground shield only to grounded controller case.
4. When connecting to all other thermostats, remote
indoor sensor wiring can be sized from 16 to 22 AWG
(1.31 to .34 mm2) depending on the application.
5. The maximum length of wire from a thermostat or
remote indoor sensor to another remote indoor sensor
is 1000 feet (305 meters).
6. Twisted pair wire is recommended for wire runs longer
than 100 feet (30.5 meters).
ComfortSense 7500 Commercial Thermostat (13H15)
and ComfortSense 8500 (14X55 and 14X56)
1. Must keep wiring at least one foot away from large
inductive loads such as motors, line starters, lighting
ballasts, and large power distribution panels.
2. Do not use shielded cabling.
3. Use only standard two-wire thermostat wire.
4. Indoor (room) sensor wiring can be sized from 16 to 22
AWG depending on the application.
5. The maximum length of wire from the thermostat to all
remote sensors should not exceed 300 feet (100
meters).
CAUTION
IMPORTANT
Figure 1. Cover Removal
2. Tilt the cover out and away from the sub-base to
release the two locking tabs.
INSTALLATION
Install the remote indoor sensor on an inside wall
approximately 54 inches (1372 mm) from the floor (or in
the specified location) to allow exposure to the average
room temperature. Do not mount the remote indoor sensor
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on an outside wall, on a wall containing water pipes or near
air ducts. Avoid locations that are exposed to discharge air
from registers or radiation from lights, appliances, or the
sun.
The remote indoor sensor may be installed on a wall, on a
standard utility conduit box using no. 6 (3.5 mm) screws or
on a 60 mm wall outlet box (see figure 2). When installing
directly on a wall, use the type of screws appropriate for the
wall material. See figure 3 for remote indoor sensor
dimensions.
STANDARD UTILITY
CONDUIT BOX
SUBBASE
NO. 6 SCREW
FRONT COVER
60 MM
WALL
OUTLET
BOX
SUBBASE
FRONT
COVER
3.5 MM SCREW
Figure 2. Installing Remote Indoor Sensor on
Standard Utility Conduit Box or 60 mm Wall Outlet
Box
3” (76mm)
4-9/16”
(116mm)
CAUTION
Improper Electrical Contact Hazard.
Screw type terminal blocks are designed to accept no
more than one 16 AWG (1.31 sq. mm
Connect multiple wires that are 16-18 AWG (1.31 to .82
mm2) with a wire nut. Include a pigtail with this wire group
and attach the pigtail to the individual terminal block.
Wire the terminal blocks as follows:
1. For single wires, strip 3/16" (5mm); for multiple wires
going into one terminal, strip 1/2 in. (13 mm) insulation
from the conductor.
2. If two or more wires are being inserted into one
terminal, twist the wires together before inserting.
E-BUS
CONNECTOR
TERMINALS
1. STRIP 1/2 IN.
(13 MM)
FROM WIRES
TO BE
ATTACHED AT
ONE TERMINAL.
2. TWIST WIRES
TOGETHER
WITH PLIERS (A
MINIMUM OF
THREE TURNS)
3. CUT TWISTED END OF WIRES TO
3/16 IN. (5 MM) BEFORE INSERTING
INTO TERMINAL AND TIGHTENING
SCREW. THEN PULL ON EACH
WIRE IN ALL TERMINALS TO
CHECK FOR GOOD MECHANICAL
CONNECTION.
Figure 4. Multi-wire Installation
NOTE: When two or more wires are being inserted
into one terminal, be sure to twist them together.
Deviation from this rule can result in improper
electrical contact (see figure 4).
3. Insert the wire in the required terminal location and
tighten the screw to complete the termination.
4. Verify remote indoor sensor wiring per figure 5. Check
that thermistor is in place.
ZONE SENSOR (RT2)
2
) conductor.
THERMOSTAT (A2)
7/8”
(22mm)
Figure 3. Room Sensor Dimensions
WIRING
Attach the wires from the device sensor terminals to the
appropriate remote indoor sensor terminals on the
thermostat (see figure 5).
THERM
ISTOR
S1
S2
Figure 5. Room Sensor Wiring
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