Lennox C0STAT05FF1L Installation Instruction

©2017 Lennox Industries Inc.

Dallas, Texas, USA

THIS MANUAL MUST BE LEFT WITH THE OWNER

FOR FUTURE REFERENCE

Shipping and Packing List

Shipped with Product

1 - Thermostat
2 - Plastic wall anchors
2 - Screws
1 - Operation manual

Optional Accessories (not included)

Remote indoor sensor: 47W37
Wall Plate: X2659

INSTALLATION INSTRUCTION

C0STAT05FF1L CS3000

Commercial Programmable

Thermostat

CONTROLS

507517-02
6/2017
Supersedes 507517-01

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. This thermostat is suitable for the
following Lennox Commercial systems:

 Heat/cool systems (conventional)
 Packaged heat pumps (2-20 tons)
 Split heat pump systems (7-10 tons)

NOTE - Not for use with small 3-5 ton split heat pump
systems.

Page 2

It includes a programmable filter change reminder,
equipment maintenance reminder and a system check
indicator to notify the user when the equipment requires
service.

The remote indoor sensor when connected and configured
will act as a room temperature sensor instead of internal
temperature sensor available with the thermostat. The dip
switch is used to select either built-in or external remote
indoor temperature sensor used for temperature control.

WARNING

This product contains a chemical known to the State of
California to cause cancer, birth defects, or other
reproductive harm.

CAUTION

Do not short (jumper) across terminals on the gas valve
or at the system control to test installation. This will dam
age the thermostat and void the warranty.

IMPORTANT

Read all of the information in this manual before using this
thermostat.

All wiring must conform to local and national building and
electrical codes and ordinances.

This is a 24VAC low-voltage thermostat. Do not install on
voltages higher than 30VAC.

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

General

These instructions are intended as a general guide and do
not supersede local codes in any way. Consult authorities
having jurisdiction before installation.

Check equipment for shipping damage. If you find any
damage, immediately contact the last carrier.