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.

6
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.

8
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.

9
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

11
Installer Settings
SYSTEM SETUP
Sets the thermostat for operation with either a heat
pump or condenser unit and defines the number of
compressor stages and the number of backup
heat stages (gas, electric or both).
system settings
compressor settings
indoor unit settings
no heat
<
non heat pump
heat pump
compressor stage
indoor heat stage


+
+
1
1
electric
gas/oil
Figure 4. System Setup
SENSORS SETTINGS
Use the following information to install sensors
and setup in the user interface.
Indoor Outdoor
outdoor sensor
indoor sensor
remote 10k
remote 20k
<
outdoor
discharge air
none

internal
Figure 5. Sensor Selections

12
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
Installer Settings > sensor settings > outdoor
sensor):
SOption 1 is using a outdoor temperature
sensor (X2658) (default). Sensor connects
to To and Tc terminals on the thermostat.
SOption 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 discharge air sensor is for
monitoring and display only. There is no
control based on input from this sensor.
Indoor Sensors (remote temperature room
sensor)
This thermostat can support one to five remote
indoor temperature sensors. Users has three
options to select from under Installer Settings >
sensor settings > indoor sensor:
SOption 1 is remote 10k (47W37)
SOption 2 is remote 20k (47W36)
SOption 3 is internal (default)
NOTE: Both external sensors are purchase
separately. Wiring examples for up to five sensors
are illustrated in figure 6 on page 13. 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 - The outdoor sensor uses standard
thermostat wiring; it may be wired using two wires
of a multiple wire cable.
NOTE - Wire run should not exceed 300 feet
(100m).

13
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
Figure 6. Indoor Sensor Configurations (Option 2, 20K Setting)

14
RESIDUAL COOL
Default is 0 seconds. This is the time, in seconds,
that the fan runs after a call for cooling is satisfied
in order to deliver any residual cooling ability from
the coil and ductwork into the conditioned space.
Options are 0, 30, 60, 90 and 120 minutes. 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.

15
DEADBAND
Default is 2°F. The deadband setting is the
minimum difference between the cooling and
heating set points. 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 previous menu.
SMOOTH SET RECOVERY(SSR)
Options are enable or disable. Default is Enabled.
When enabled, smooth set back begins recovery
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 first stage gas/electric
heating and 6°F per hour for first stage
compressor based heating or cooling. With
Smooth Set Back disabled, the control will start a
recovery at the programmed time.
NOTE - Smooth Set Back and STG2 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,
address, phone, email, website and number.
Touch <to return to previous menu.
TEMPERATURE OFFSET
Default is 0°F. This setting can be used to offset
the displayed space temperature by up to +/- 5°F.
This offset also applies to the control temperature.
Touch <to return to previous menu.
HUMIDITY OFFSET
Default is 0%. This can be used to offset the
displayed and controlled space relative humidity
(RH) by up to +/- 10% RH. Touch <to return to
previous menu.

16
Table 1. Smooth Set back Recovery (SSR) & SSR Stage 2 Lock Out Operation
Equipment Available SSR = Enabled;
SSR Stage 2 lock out =
enabled
SSR = Enabled;
SSR Stage 2 lock-out = disabled (off)
1 stage HP with 1 or 2
stages electric backup
Run HP (Y1) only; all backup
heat (W1/W2) enabled 20 -
120 min before wake up set
point
Run HP (Y1) and have available backup
heat (W1/W2) as needed.
2 stage HP with 1 or 2
stages electric backup
Run HP (Y1/Y2) only; all
backup heat (W1/W2) en
abled 20 - 120 min before
wake up setpoint
Run HP (Y1/Y2) and have available
backup heat (W1/W2) as needed.
1 stage HP with 1 stage
gas/oil backup
Run HP (Y1) only; all backup
heat (W1) enabled 20 - 120
min before wake up setpoint
Run HP (Y1) until a 2nd stage demand is
needed (by time/temp. differential); then
HP operation must stop and changeover
and lock in to W1 heat until setpoint
reached.
1 stage HP with 2 stages
gas/oil backup or modula
tion furnace
Run HP (Y1) only; all backup
heat (W1/W2) enabled 20 -
120 min before wake up set
point
Run HP (Y1) until a 2nd stage demand is
needed (by time/temp differential); then
HP operation must stop and changeover
to W1/W2 heat as needed; lock in
W1/W2 heat until setpoint reached.

17
Table 1. Smooth Set back Recovery (SSR) & SSR Stage 2 Lock Out Operation (continued)
Equipment Available SSR = Enabled;
SSR Stage 2 lock out =
enabled
SSR = Enabled;
SSR Stage 2 lock-out = disabled (off)
2 stage HP with 1 stage
gas/oil backup
Run HP (Y1/Y2) only; all
backup heat (W1/W2) en
abled 20 - 120 min before
wake up setpoint.
Run HP (Y1/Y2) until a 2nd stage de
mand is needed (by time/temp. differen
tial); then HP operation must stop &
changeover and lock in to W1 heat until
setpoint reached.
2 stage HP with 2 stages
gas/oil backup or modula
tion furnace
Run HP (Y1/Y2), all backup
heat (W1/W2) enabled 20 -
120 min before wake up set
point.
Run HP (Y1/Y2) until a 2nd stage de
mand is needed (by time/temp. differen
tial); then HP operation must stop &
changeover and lock in to W1/W2 heat
until setpoint reached.
2 stages gas/oil heat or
modulation furnace
Run W1 only; W2 enabled 20
- 120 min before wake up set
point.
Run W1 heat and bring on W2 heat until
setpoint reached.
1 stage cooling Run Y1 to wake up set point. Run Y1 heat until setpoint reached.
2 stage cooling
Run Y1 during recovery en
able Y2 field wake up set
point.
Run Y1 & Y2 heat as needed until set
point reached.

18
STAGE DELAY TIMER
Default ON. When ON, all stage delay timers
(stages 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 DIFFERENTIALS
Stage delays and differentials are individual set in
the installer settings screen.
STAGE 1 DIFF
Stage 1 differential 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 DIFF
(Where applicable) 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 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 first stage fails to advance the
ambient 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
previous menu.
H/C STAGES LOCKED IN
When disabled the heat/cool stages are turned off
separately). When enabled (default), heat/cool
stages are turned off together. Touch <to return to
previous menu.

19
STAGE 2 HP LOCK TEMP
When disabled the heat pump stage 2 operates
normally). 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 between -40 and 75ºF.
Touch <to return to previous menu.
Configuration Figures
Multi-stage Cooling for Heat Pump/Non-Heat Pump 7
Heating - Non-Heat Pump (1 or 2 stages) 8
Heating - Heat Pump with NO backup heat 10
Heating - Heat Pump w/electric heat (2-stage: 1compr/1backup) 10
Heating - Heat Pump w/electric heat (3 stage: 2compr/1backup) 11
Heating - Heat Pump w/electric heat (3 stage: 1compr/2backup) 11
Heating - Heat Pump w/electric heat (4 stage: 2compr/2backup) 12
Heating - dual fuel (2-stage: 1compr/1backup) 13
Heating - dual fuel (3 stage: 1compr/2backup) 14
Heating - dual fuel (3 stage: 2compr/1backup) 15
Heating - dual fuel (4 stage: 2compr/2backup) 16

20
H/C
Stages
Locked =
YES
H/C
Stages
Locked =
NO
SET
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
Figure 7. Cooling - 1 or 2 Stages
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
SET
POINTS:
Figure 8. Heating - Non-Heat Pump or Heat Pump w/o Backup Heat - 1 or 2 stages