Installation - Lennox ComfortSense 7500 Commercial Installation And Setup Manual

Also, if a power loss occurs, the system will go into
compressor protection mode and display "waiting"
next to either a snow flake (compressor cooling), or
flame (compressor heating) in the display.
Internal and External Temperature Sensors
See information starting on page 9 for sensor
wiring and configuring sensor settings under
Installer Settings menu.
Improper installation, adjustment, alteration, ser­
vice or maintenance can cause property damage,
personal injury or loss of life.
Installation and service must be performed by a
licensed professional HVAC installer (or equiva­
lent) or service agency.
Always turn off power at the main power source
by switching the circuit breaker to the OFF posi­
tion before installing or removing this thermostat.
All wiring must conform to local and national build­
ing and electrical codes and ordinances.
WARNING
WARNING
This is a 24VAC low-voltage thermostat. Do not
install on voltages higher than 30VAC.
Do not short (jumper) across terminals on the gas
valve or at the system control to test installation.
This will damage the thermostat and void the war­
ranty.

Installation

Before beginning installation, note the type of
equipment, number of stages, and any accessories
being installed. This thermostat is a 24VAC
low-voltage thermostat and requires a common wire
to the thermostat to operate.
DO
S
Shut off all power to system before
installing.
S
Read this entire document, noting which
instructions pertain to your equipment and
system requirements.
S
Make sure that all wiring conforms to local
and national building and electrical codes and
ordinances.
S
Use thermostat wire between the
thermostat and any optional remote
3
CAUTION