Lennox CS7500 Assembly instructions

507506-03
02/2023
Supersedes 507506-02
Installation and Setup
Guide
CS7500 Commercial
Installation and Setup Guide

2
Table of Contents
Shipping and Packing List .....................................2
CS7500 Features ..................................................3
Product Dimensions ..............................................3
Installation .............................................................4
Menu......................................................................9
Installer Settings..................................................10
Dehumidify Mode.................................................25
Economizer..........................................................27
Unit Part (Catalog) & Serial Numbers..................28
Memory Protection ..............................................28
Start-Up Sequence of Operations .......................29
Diagnostic Information.........................................30
Reminder Information..........................................33
Supported Congurations....................................34
Installation Checklist............................................35
Shipping and Packing List
Verify the following items have been included
with in the packing:
Quantity Item
1
CS7500 touchscreen, 7-day
programmable thermostat with back
plate
1 Wall plate
2Mounting screws (M3.5x25mm self-
tapping screws)
2 Wall anchors
1 Warranty sheet
1 User Guide
1 Installation Guide

3
CS7500 Features
The CS7500 is a commercial, electronic, 7-day,
multi-stage, programmable, touchscreen thermo-
stat. It also o󰀨ers enhanced capabilities which in-
cludes:
• Dehumidication measurement and control
• Equipment maintenance reminders
• Worry-free memory storage feature
• Menu-driven touch-screen display
This thermostat supports heat pumps (single or two-
stage) or non-heat pump units, with up to:
• Two auxiliary stages
• Two stages of heating and three stages of
cooling
• Economizer support
Product Dimensions
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)
Compressor Short Cycle Protection
This thermostat is equipped with automatic com-
pressor protection to prevent potential damage due
to short cycling or extended power outages.
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ake (compressor cooling), or
ame (compressor heating) in the display.
Internal and External Temperature Sensors
See information starting on page 9 for sensor wir-
ing and conguring sensor settings under Installer
Settings menu.
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
equivalent) or service agency.

4
WARNING
Always turn o󰀨 power at the main power source by
switching the circuit breaker to the OFF position
before installing or removing this thermostat.
All wiring must conform to local and national
building and electrical codes and ordinances.
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 installation.
This will damage the thermostat and void the
warranty.
Installation
Before beginning installation, note the type of equip-
ment, number of stages, and any accessories being
installed. This thermostat is a 24VAC low-voltage
thermostat and requires a common wire to the ther-
mostat to operate.
DO
• Shut o󰀨 all power to system before installing.
• Read this entire document, noting which
instructions pertain to your equipment and
system requirements.
• Make sure that all wiring conforms to local
and national building and electrical codes and
ordinances.
• Use thermostat wire between the thermostat and
any optional remote temperature sensor (may
be separate wire pair or two wires of a multi-wire
cable for outdoor temperature sensor).
• Ensure load from any thermostat connection is
less than 1 AMP.
DO NOT
• Install on voltages higher than 30VAC.
• 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.
• Install on outside walls or in direct sunlight.
• Exceed thermostat wire run length greater
than 300 feet (91m).

5
Hardware Installation
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 oor in an area with good air
circulation at average temperature.
3. Do not install the thermostat where it can be
a󰀨ected by:
• Drafts or dead spots behind doors and in
corners.
• Not close to entrance or automatic doors.
• Not close to heat generating equipment
such as kitchen equipment.
• Not in an enclose environment unless a
remote indoor sensor is used.
• Hot or cold air from ducts.
• Radiant heat from sun or appliances.
• Concealed pipes and chimneys.
• Unheated (uncooled) areas such as an
outside wall behind the thermostat.
Figure 1. Removing Back Plate
4. Use steps A through J (step J applicable
when using provided wall plate) to install the
thermostat.

6
CUT OR DRILL A SMALL HOLE
FOR THERMOSTAT WIRING
¾” x ¾”
A
B
PULL ABOUT 3” OF THERMOSTAT
MOVE OUTER THERMOSTAT WIRE
JACKET.
THIS WILL HELP IN
MOSTAT WIRING TO
MOSTAT TERMINALS
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.

7
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.

8
Wiring Thermostat
Below are the terminal designations and a general
description of their purpose.
1. Connect wiring between thermostat, indoor,
and outdoor units. Connect external sensors
if applicable.
2. Connect internal and external sensors if
applicable. See information starting on page
9 for sensor wiring and conguring 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. Congure 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 - Dehumidication relay
W2 - Second-stage heating (non-heat pump) or
fourth-stage (heat pump)
Y2 - Second-stage heating or cooling
O/B/Y3 - Heat/Cool active reversing valve or third-
stage cooling
F - Economizer or other fault detection
C - Common 24VAC
G - Fan relay
W1 - First-stage heating (non-heat pump or emer-
gency heat) or third-stage heating (heat pump)
Y1 - Compressor output
R - 24VAC power
IMPORTANT!
In all applications, the commercial version of
the CS7500 thermostat can only be used if the
following installation criteria is met:
• Installation uses 18 GAUGE thermostat wire
or larger
• Thermostat wire run length DOES NOT
EXCEED 300’ (91m)
• Load from any thermostat connection is
1AMP or LESS

9
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 the installer settings menu.
Figure 3. Installer Menu Screen Conrmation
menu
performance report
notifications 13
edit schedules
settings installer settings
confirm
<
installer settings must be set
by qualified person.

10
Installer Settings
Sets the thermostat for operation with either a heat
pump or condenser unit and denes the number of
compressor stages, sets the stage 3 output congu-
ration, and the number of backup heat stages (gas,
electric or both).
Figure 4. System Setup
Sensors Settings
Use the following information to install sensors and
setup in the user interface.
Figure 5. Sensor Selections
system setup
Compressor settings
Indoor unit settings
no heat
<
Non heat pump
Heat pump
Compressor stage
indoor heat stage
electric
gas/oil
+
-
3
1
Stage 3 output
Y3
Y1 + Y2
Indoor Outdoor
Outdoor sensor
Indoor sensor
remote 10k
remote 20k
<
outdoor
discharge air
none
internal