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

11
Outdoor Sensor (small commercial split systems
only)
An outdoor temperature sensor (X2658) is required
for balance points and Humiditrol®unit operations.
Users has three options to select from (under Install-
er Settings > sensor settings > outdoor sensor):
• Option 1 is using a outdoor temperature sensor
(X2658) (default). Sensor connects to To and Tc
terminals on the thermostat.
• Option 2 is using a discharge air temperature
sensor (19L22). Connects to To and Tc terminals
on thermostat. This sensor is a non-adjustable
duct mount temperature sensor.
NOTE: The outdoor sensors use standard non-
shielded thermostat wiring; it may be wired
using two wires of a multiple wire cable.
Indoor Sensors (remote temperature
room sensor)
This thermostat can support one to ve remote in-
door temperature sensors. Users have three options
to select from under Installer Settings > sensor set-
tings > indoor sensor:
• Option 1 is remote 10k (47W37)
• Option 2 is remote 20k (47W36)
• Option 3 is internal (default)
NOTE: Both external sensors are purchase
separately. Wiring examples for
up to ve sensors are illustrated in
gure 6 on page 11. All examples
shown result in Option 2, 20k setting.
For detail installation requirements and
procedure, refer to the instructions provided
with either kit. Thermostat terminals Ti and
Tc are used for indoor sensor(s).
NOTE: All remote sensors use standard non-
shielded thermostat wiring; outdoor
sensors may be wired using two wires of a
multiple wire cable.
NOTE: Outdoor and indoor sensor wire runs
should not exceed 300 feet (100m).
NOTE: The discharge air sensor is for monitoring
and display only. There is no control based
on input from this sensor.

Figure 6. Indoor Sensor Congurations (Option 2, 20K Setting)
TcTi Tc
Ti
Ti Ti
Ti
Tc
Tc
Tc
One sensor
- (1) 47W36
Two sensors -
(2) 47W37
Three sensors -
(2) 47W36 and
(1) 47W37
Four sensors -
(4) 47W36
Five sensors - (3)
47W36 and (2)
47W37

13
Residual Cool
Default is 0 seconds. This is the time, in seconds,
that the fan runs after a call for cooling is satised in
order to deliver any residual cooling ability from the
coil and ductwork into the conditioned space. Op-
tions are 0, 30, 60, 90 and 120 seconds. Touch < to
return to previous menu.
Low and High Balance Points
These balance points are for heat pump systems
only with an outdoor sensor installed and enabled
plus a indoor unit setting enable. Either gas/oil or
electric will enable the balance point options in the
installer settings list.
1. When in heat mode and the outdoor
temperature is below the programmed Low
Balance Point, then heat pump heating is not
allowed and only backup heat will be used.
2. When in heat mode and the outdoor temperature
is above the programmed High Balance Point,
then heat pump heating is allowed and backup
heat will not be used.
3. When in heat mode and the outdoor
temperature is between the programmed Low
and High Balance Points, then heat pump
heating and backup heat can be used.
4. Options are enable or disable. Default for both
is disable. Once enabled, the following settings
are available.
5. Low Balance Point Default is 25°F. Adjustable
range is -40°F to 48°F.
6. High Balance Point Default is 50°F. Adjustable
range is -38°F to 75°F.
NOTE: The high balance point minimum range is
adjustable to within +2°F of the low balance
point setting. For example, if the low
balance point is set to 0°F, then the lowest
setting for the high balance point is 2°F.
Deadband
Default is 2°F. The deadband setting is the mini-
mum di󰀨erence between the cooling and heating
setpoints. This setting is used in cool/heat mode to
ensure smooth equipment operation. The deadband
is adjustable from 2 to 9°F. Use the + or - option to
select desired deadband. Touch < to return to pre-
vious menu.
Smooth Set Recovery(SSR)
Options are enable or disable. Default is Enabled.
When enabled, smooth set recovery begins recov-
ery up to two hours before the programmed time
so that the programmed temperature is reached at
the corresponding programmed event time. Assume
12°F per hour for rst stage gas/electric heating and
6°F per hour for rst stage compressor based heat-
ing or cooling. With Smooth Set Recovery disabled,
the control will start a recovery at the programmed
time.

14
NOTE: Smooth Set Recovery and SSR STG 2
Lock Out operations vary depending on
equipment (see table 1).
SSR Stage 2 Lock Out
Default is 20 minutes. Use the + or - option to set the
number of minutes before the programmed event
time that stage 2 is allowed to operate (20 to 120
minutes in 10 minute increments). Touch < to return
to previous menu.
Contractor Information
This allows the installer to add contractor name, ad-
dress, phone, email, website and number.
Touch <to return to previous menu.
Temperature O󰀨set
Default is 0°F. This setting can be used to o󰀨set the
displayed space temperature by up to +/- 5°F. This
o󰀨set also applies to the control temperature. Touch
< to return to previous menu.
Humidity O󰀨set
Default is 0%. This can be used to o󰀨set the dis-
played and controlled space relative humidity (RH)
by up to +/- 10% RH. Touch < to return to previous
menu.
Table 1. Smooth Set Recovery (SSR) & SSR Stage 2 Lock Out Operation
Equipment Available When SSR is enabled then SSR
Stage 2 lock out is enabled. Can be
set between 20 and 120 minutes.
Default is 20 minutes.
When SSR is disabled then
SSR Stg 2 lock-out setting is
disabled.
Single-stage heat pump with one or
two stages of electric backup
• Run heat pump (Y1) only
• All backup heat (W1/W2) is
enabled and SSR Stage 2 Lock
Out is set between 20 - 120
minutes before the wakeup set
point.
Run heat pump (Y1) and will
have available backup heat
(W1/W2) as needed.
Two-stage heat pump with one- or
two-stages of electric backup
• Run heat pump (Y1/Y2) only.
• All backup heat (W1/W2) is
enabled and SSR Stage 2 Lock
Out is set between 20 - 120
minutes before the wake-up set
point.
Run heat pump (Y1/Y2) and
will have available backup heat
(W1/W2) as needed.

15
Equipment Available When SSR is enabled then SSR
Stage 2 lock out is automatically
enabled.
When SSR is disabled then
SSR Stg 2 lock-out setting is
disabled.
Single-stage heat pump with
single-stage gas or oil backup
• Run heat pump (Y1) only
• All backup heat (W1) is enabled
and SSR Stage 2 Lock Out is set
between 20 - 120 minutes before
the wake-up set point.
• Run heat pump (Y1) until a
second stage heating demand is
needed which is determined by
the time / temperature di󰀨erential.
• Heat pump operation will stop and
gas or oil heat will start.
• Changeover and lock-in to W1
heat will occur until set point
reached.
Single-stage heat pump with:
• Two-stages of gas or oil backup
• Modulation furnace
• Run heat pump (Y1) only
• All backup heat (W1/W2) is
enabled and SSR Stage 2 Lock
Out is set between 20 - 120
minutes before the wakeup set
point.
• Run heat pump (Y1) until a
second stage heating demand is
needed which is determined by
the time / temperature di󰀨erential.
• Heat pump operation will stop and
changeover to W1/W2 heat as
needed
• Lock-in W1/W2 heat until set point
is reached.
Two-stage heat pump with one
stage gas/oil backup
• Run heat pump (Y1/Y2) only.
• All backup heat (W1/W2) is
enabled and SSR Stage 2 Lock
Out is set between 20 - 120
minutes before the wakeup set
point.
• Run heat pump (Y1/Y2) until a
second-stage demand is needed
which is determined by the time /
temperature di󰀨erential.
• Heat pump operation will stop and
gas or oil heat will start.
• Changeover and lock-in to W1
heat will occur until set point is
reached

16
Equipment Available When SSR is enabled then SSR
Stg 2 lock out is automatically
enabled.
When SSR is disabled then
SSR Stg 2 lock-out setting is
disabled.
Two-stage heat pump with:
• Two-stages of gas or
• Oil backup
• Modulation furnace
• Run heat pump (Y1/Y2).
• All backup heat (W1/W2) is enabled
and SSR Stage 2 Lock Out is set
between 20 - 120 minutes before
the wakeup set point.
• Run HP (Y1/Y2) until a second-
stage demand is needed which
is determined by the time /
temperature di󰀨erential.
• Heat pump operation will stop and
changeover and lock-in to W1/W2
heat until set point is reached.
Two stages of gas/oil heat or
modulation furnace
• Run W1 only; W2 is enabled and
SSR Stage 2 Lock Out is set
between 20 - 120 minutes before
the wake-up set point.
• Run W1 heat and bring on W2 heat
until set point is reached.
Single stage cooling • Run Y1 to wake up set point. • Run Y1 until set point is reached.
Two stage cooling • Run Y1 during recovery and enable
Y2 eld wake up set point.
• Run Y1 and Y2 as needed until set
point is reached.
Three stage cooling • Run Y1 during recovery and enable
Y2 and Y3 at eld wake up set
point.
• Run Y1, Y2, and Y3 as needed until
set point is reached.
Stage Delay Timer
Default ON. When ON, all stage delay timers (stag-
es 2, 3, and 4) are enabled and will serve to bring
on additional stage(s) of cooling or heating on a
timed basis (default 20 minutes) in cases when the
previous stage of heating or cooling will not raise
or lower the room temperature to the set point in a
given time. When OFF is selected all stage delay
timers are disabled. This means stages are changed
based on the temperature and not their timer delays.
Scroll to STG DELAY TIMERS; and touch to select
the applicable stage delay timer. Touch < to return to
previous menu.
Stage Delay Di󰀨erentials
Stage delays and di󰀨erentials are individual set in
the installer settings screen.
Stage 1 Di󰀨erential
Stage 1 di󰀨erential is used in all thermostats. The
default is 1.0°F but can be programmed between
0.5° and 8.0°F in 0.5°F increments. Touch < to
return to previous menu.
Stage 2 Through 4 Di󰀨erential
(Where applicable) The default is 1.0°F but can be
programmed between 0.5° and 8.0°F in 0.5°F incre-
ments. Touch < to return to previous menu.

17
Stage 2 Through 4 Delays
(Where applicable) If STG DELAY TIMERS is
turned ON, the default delay is 20 minutes but can
be programmed from 5 to 120 minutes in 5-minute
increments. If rst stage fails to advance the ambi-
ent temperature toward the setpoint by 1.0°F in the
programmed delay time, then the second stage is
activated.
Scroll to STG 2 DELAY (or 3 or 4); touch to select.
Select the desired delay. Touch < to return to previ-
ous menu.
H/C Stages Locked In
When disabled the heat/cool stages are turned o󰀨
separately). When enabled (default), heat/cool stag-
es are turned o󰀨 together. Touch < to return to pre-
vious menu.
Stage 2 HP Lock Temp
When disabled the heat pump stage 2 operates nor-
mally). Enable this setting in dual fuel applications to
lock in the 2nd stage compressor when the outdoor
temperature is at or less than the LOCK TEMP set
point. Scroll to STAGE 2 HP LOCK TEMP; touch
ENTER. Use - + option to select a LOCK TEMP be-
tween -40 and 75ºF. Touch < to return to previous
menu.
Conguration Figures
Multi-stage Cooling for Heat Pump/Non-Heat Pump 7
Three-stage Cooling for Non-Heat Pump 8
Heating - Non-Heat Pump (1 or 2 stages) 9
Heating - Heat Pump w/electric heat (3 stage: 2compr/1backup) 10
Heating - Heat Pump w/electric heat (3 stage: 1compr/2backup) 10
Heating - Heat Pump w/electric heat (4 stage: 2compr/2backup) 11
Heating - dual fuel (2-stage: 1compr/1backup) 12
Heating - dual fuel (3 stage: 1compr/2backup) 13
Heating - dual fuel (3 stage: 2compr/1backup) 14
Heating - dual fuel (4 stage: 2compr/2backup) 15

18
Figure 7. Cooling - 1 or 2 Stages
H/C
Stages
Locked =
YES
H/C
Stages
Locked =
NO
POINTS:
2nd stage
ON
2nd stage
OFF
1st stage
ON
1st stage
OFF
2nd stage
ON
2nd stage
OFF
1st stage
ON
1st stage
OFF
SP -1.5 SP -1.0 SP -0.5
SP
SP +1.5SP +1.0SP +0.5 SP +2.0
Stg1 Differential
Stg2 Differential
Stg2 Differential
Stg1 Differential
3rd stage
OFF
3rd stage
ON
Stg3 Differential
Stg3 Differential 3rd stage
ON
3rd stage
OFF
SP +2.5 SP +3.0
Figure 8. Three-Stage Cooling for Non Heat Pump
H/C
Stages
Locked =
YES
H/C
Stages
Locked =
NO
POINTS:
2nd stage
ON
2nd stage
OFF
1st stage
ON
1st stage
OFF
2nd stage
ON
2nd stage
OFF
1st stage
ON
1st stage
OFF
SP -1.5 SP -1.0 SP -0.5 SP SP +1.5SP +1.0 0.2+PS5.0+PS
Stg1 Differential
Stg2 Differential
Stg2 Differential
Stg1 Differential

19
Figure 9. Heating - Non-Heat Pump or Heat Pump w/o Backup Heat - 1 or 2 Stages
Figure 10. Heating - Heat Pump w/Electric - 3 Stage
(2 Compressor / 1 backup OR 1 Compressor / 2 Backup)
H/C
Stages
Locked =
YES
H/C
Stages
Locked =
NO
1st stage
ON
2nd stage
ON
1st stage
ON
2nd stage
ON
2nd stage
OFF
1st stage
OFF
1st stage
OFF
2nd stage
OFF
SP -1.5 SP -1.0 SP -0.5 SP SP +0.5SP -2.0
Stg1 Differential
Stg2 Differential
SP -2.5SP -3.0
Stg1 Differential
Stg2 Differential
POINTS:
H/C
Stages
Locked =
NO
H/C
Stages
Locked =
YES
POINTS:
3rd stage
ON
1st stage
ON
2nd stage
ON
3rd stage
ON
1st stage
ON
2nd stage
ON
2nd stage
OFF
3rd stage
OFF
1st stage
OFF
1st stage
OFF
2nd stage
OFF
3rd stage
OFF
SP -1.5 SP -1.0 SP -0.5 SP SP +0.5SP -2.0
Stg1 Differential
Stg3 Differential
Stg2 Differential
SP -2.5SP -3.0SP -3.5
Stg1 Differential
Stg3 Differential
Stg2 Differential

20
Figure 11. Heating - Heat Pump w/Electric - 4 Stage (2 Compressor / 2 Backup)
Figure 12. Heating - Dual Fuel - 2 Stage (1 Compressor / 1 Backup)
H/C
Stages
Locked =
YES
H/C
Stages
Locked =
NO
3rd stage
ON
1st stage
ON
2nd stage
ON
4th stage
ON
3rd stage
ON
1st stage
ON
2nd stage
ON
4th stage
ON
2nd stage
OFF
3rd stage
OFF
4th stage
OFF
1st stage
OFF
Stg4 Differential
1st stage
OFF
2nd stage
OFF
3rd stage
OFF
4th stage
OFF
POINTS:
SP -1.5 SP -1.0 SP -0.5 SP SP +0.5SP -2.0
Stg1 Differential
Stg3 Differential
Stg2 Differential
SP -2.5SP -3.0SP -3.5
Stg1 Differential
Stg3 Differential
Stg2 Differential
Stg4 Differential
H/C
Stages
Locked =
NO or
YES
2nd stage
ON
1st stage
ON
2nd stage
OFF
1st stage
OFF
SP -1.5 SP -1.0 SP -0.5
SP
SP +0.5SP -2.0
Stg1 Differential
SP -2.5SP -3.0
Stg2 Differential
POINTS: