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2018 Lennox Industries Inc.
Dallas, Texas, USA
COMMERCIAL UNITS
KITS AND ACCESSORIES
504,603M
1/2018
Supersedes 11/2016
INDOOR REMOTE SENSORS
INSTALLATION INSTRUCTIONS FOR INDOOR REMOTE TEMPERATURE SENSORS
— 10K OHM (47W37) AND 20K OHM (47W36)
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)
Figure 1. Cover Removal
2. Tilt the cover out and away from the sub-base to
release the two locking tabs.
Electrical Wiring Practices
CAUTION
Erratic System Operation Hazard.
Failure to follow proper wiring practices can introduce
disruptive electrical interference (noise).
IMPORTANT
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 mm
2
) 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).
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
