E
2017 Lennox Industries Inc.
Dallas, Texas, USA
THIS MANUAL MUST BE LEFT WITH THE OWNER
FOR FUTURE REFERENCE
WARNING
Improper installation, adjustment, alteration, service or
maintenance can cause property damage, personal injury
or loss of life. Installation and service must be performed
by a qualified installer, service agency or the gas supplier
OPERATION MANUAL
C0STAT05FF1L CS3000
Commercial Programmable
Thermostat
CONTROLS
507518-02
5/2017
Supersedes 507518-01
C0STAT05FF1L 5/2 Day Programmable
Thermostat
The Lennox ComfortSense
®
3000 Series Commercial
Programmable Thermostat, Model C0STAT05FF1L
(11Y05) is a 5/2 day programmable and 2-heat / 2-cool
electronic thermostat. It includes a programmable filter
change reminder, an equipment maintenance reminder,
and a system check indicator to notify the user when the
equipment requires service.
This thermostat is suitable for 2‐stage heat / 2‐stage cool
applications using a gas or electric auxiliary heat source and
can also be used with an economizer.
