Lennox ComfortSense 7500 Assembly instructions

Installation and Setup
Guide
Color Touchscreen
Programmable Commercial
Thermostat
ComfortSense®7500
Model: C0STAT06FF1L
Cat: 13H15
507506-01
10/2015
Supersedes 8/2015

2
Table of Contents
Shipping and Packing List 2...........
ComfortSense
®7500 Thermostat 3.....
Features 3.........................
INSTALLATION
Installing Thermostat 5...............
Wiring Thermostat 9.................
SETTINGS
Menu 10...........................
Installer Settings 10..................
Dehumidify 28......................
Unit Part (Catalog) and Serial
Number 32.........................
Memory Protection 32................
Appendix A. Humiditrol 34.............
Appendix B. Diagnostic Information 34..
Appendix C. Reminder Information 37...
Appendix C. Supported
Configurations 38....................
Appendix D. Installer Checklist 40......
Shipping and Packing List
1 - ComfortSense
®7500 touchscreen, 7-day
programmablethermostat with back plate
1 - Wall plate
2 - Mounting screws (M3.5x25mm self-tapping
screws)
2 - Wall anchors
1 - Warranty sheet
1 each - User and Installer Guides
IMPORTANT
Read this manual before programming the ther
mostat.
Use this thermostat only as described in this
manual.

3
ComfortSense®7500 Commercial
Thermostat (C0STAT06FF1L)
(Catalog No. 13H15)
Description
The ComfortSense®7500 commercial thermostat
(C0STAT06FF1L) is an electronic 7-day universal
multi‐stage programmable touch screen
thermostat. It also offers enhanced capabilities
which include:
Sdehumidification measurement and control,
Sequipment maintenance reminders,
Sworry-free memory storage feature,
Smenu-driven touch-screen display.
This thermostat supports heat pumps (single or
two stage) or non-heat pump units, with up to:
Stwo auxiliary stages
Stwo stages of heating and two stages of
cooling.
Unit Dimensions (H x W x D)
Case dimensions: 3-5/16 x 4-5/16 x 7/8 in. (84 x
110 x 22mm)
Wall Plate Dimensions (H x W)
Plate dimensions: 4-1/2” x 5-3/4” (114 x 146mm)
Features
Compressor Short Cycle Protection
This thermostat is equipped with automatic
compressor protection to prevent potential
damage due to short cycling or extended power
outages. The short-cycle protection provides a
5-minute delay between heating or cooling cycles
to prevent the compressor from being damaged.
A 5-minute compressor short cycle protection
timer begins when a compressor output is
de-energized. 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 11 for sensor
wiring and configuring sensor settings under
Installer Settings menu.

4
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
licensed professional HVAC installer (or equiv
alent) or service agency.
CAUTION
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®Model
7500 thermostat can only be used with all resi
dential units and approved commercial split‐
system matches, and those which meet the fol
lowing installation criteria:
Sinstallation uses 18 GAUGE thermostat
wire or larger,
Sthermostat wire run length DOES NOT
EXCEED 300' (91m),
Sload from any thermostat connection is 1
AMP or LESS.
CAUTION
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
THERMOSTAT 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
1. Shut off all power to system before installing.
2. Read this entire document, noting which
instructions pertain to your equipment and
system requirements.
3. Make sure that all wiring conforms to local
and national building and electrical codes and
ordinances.
4. Use thermostat wire between the thermostat
and the optional outdoor temperature sensor
(may be separate wire pair or two wires of a
multi-wire cable).
5. Ensure load from any thermostat connection
is less than 1 AMP.
DO NOT
1. Install On voltages higher than 30VAC.
2. Short (jumper) across terminals on the gas
valve or at the system control to test
installation. This will damage the thermostat
and void the warranty.
3. Install on outside walls or in direct sunlight.
4. Exceed thermostat wire run length greater
than 300 feet (91m).
INSTALLING THERMOSTAT
1. Unpacked the thermostat and open the case
with a thin-blade screwdriver. Place between
wall base and unit and twist to separate unit
from base.
2. Select a location for the thermostat about 5
feet (1.5m) above the floor in an area with
good air circulation at average temperature.
3. Do not install the thermostat where it can be
affected by:
SDrafts or dead spots behind doors
and in corners.
SNot close to entrance or automatic
doors.

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SNot close to heat generating
equipment such as kitchen
equipment.
SNot in an enclose environment unless
a remote indoor sensor is used.
SHot or cold air from ducts.
SRadiant heat from sun or appliances.
SConcealed pipes and chimneys.
SUnheated (uncooled) areas such as
an outside wall behind the thermostat.
Figure 1. Removing Back Plate
4. Use steps Athrough J (step Japplicable
when using provided wall plate) to install the
thermostat.
CUT OR DRILL A SMALL HOLE
FOR THERMOSTAT WIRING
¾” x ¾”
A
B
PULL ABOUT 3” OF THERMOSTAT
WIRE THROUGH OPENING AND RE
MOVE OUTER THERMOSTAT WIRE
JACKET.
THIS WILL HELP IN
ROUTING THE THER
MOSTAT WIRING TO
THE PROPER THER
MOSTAT TERMINALS

7
1/4”
TRIM 1/4” INSULATION FROM
END OF EACH WIRE
C
USE UNIT WALL PLATE AS TEMPLATE TO MARK
DESIRED MOUNTING HOLE LOCATIONS ON WALL
D
(USE A LEVEL) ALIGN WALL PLATE
DRILL 3/16” HOLES AT MARKED LOCATIONS
ON WALL FOR WALL ANCHORS
E
NOTE: INSTALLATION OF WALL PLATE
IS OPTIONAL.

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Thermostat Installation with Wall Plate
F- Place wall plate
over holes in wall.
G- Insert wall anchors
through wall plate into wall.
H - Attach back plate
to wall plate.
I- Insert provided screws through back and wall
plates into wall anchors.
J- Attach thermostat to
back plate.
Thermostat Installation without Wall Plate
G- Place back plate over wall
anchors in wall.
F- Insert wall anchors
through wall plate into wall.
H- Insert provided screws through
back plate into wall anchors.
I- Attach thermostat to
back plate.

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WIRING THERMOSTAT
Below are the terminal designations and a general
description of their purpose.
1. Connect wiring between thermostat, indoor
and outdoor units.
2. Connect internal and external sensors if
applicable. See information starting on page
11 for sensor wiring and configuring sensor
settings under the Installer Settings menu.
NOTE - Wire run should not exceed 300 feet
(100m).
3. Seal the hole in the wall with a suitable
material to prevent drafts from entering the
thermostat case.
4. Configure thermostat and equipment for
system type, program the thermostat, and
test system.
TERMINAL DESIGNATIONS
Ti - Remote indoor temperature sensor
Tc - Sensor common terminal
To - Outdoor or discharge air temperature
sensor
Ec - Economizer/Time-of-Day (TOD)
output-powered via R terminal.
D - Dehumidification relay
W2 - Second-stage heating (non-heat pump) or
fourth-stage (heat pump)
Y2 - Second-stage heating or cooling
O - Cool active reversing valve
B - Heat active reversing valve
C - Common 24VAC
G - Fan relay
W1 - First-stage heating (non-heat pump or
emergency heat) or third-stage heating
(heat pump)
Y1 - Compressor output
R - 24VAC power

10
Settings
menu
performance report
notifications 13
edit schedules
settings
Figure 2. Menu Screen
Menu
1. Touch menu option from the home screen.
2. Touch and hold the settings option on the
menu. This will display the installer settings
notice and then menu.
installer settings
confirm
<
installer settings must be set
by qualified person.
Figure 3. Installer Menu Screen Confirmation