Lennox ComfortSense 7500 Installation And Setup Manual page 5

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 instal­
lation. This will damage the thermostat and void
the warranty.
IMPORTANT
In all applications, the ComfortSense
7500 thermostat can only be used with all
residential units and approved commercial
split‐system matches, and those which meet
the following installation criteria:
S installation uses 18 GAUGE thermostat
wire or larger,
S thermostat wire run length DOES NOT
EXCEED 300' (91m),
S load from any thermostat connection is 1
AMP or LESS.
CAUTION
®
Model
Always turn off power at the main power source
by switching the circuit breaker to the OFF posi­
tion before installing or removing this thermo­
stat.
All wiring must conform to local and national
building and electrical codes and ordinances.
5
CAUTION