Lennox ComfortSense 7500 Assembly instructions

Installation and Setup
Guide
Color Touchscreen
Programmable Thermostat
ComfortSense®7500
Model: 13H14
507504-02
5/2017
Supersedes 507504-01

2
IMPORTANT
Read this manual before programming the ther
mostat.
Use this thermostat only as described in this man
ual.
TABLE OF CONTENTS
Shipping and Packing List 2.....................
Overview 3...................................
Installation 5..................................
System Settings 21.............................
Humidify 37....................................
Dehumidify 39.................................
Unit Part (Catalog) & Serial Numbers 42............
Memory Protection 43...........................
User Settings 43...............................
WARNING
This product contains a chemical known to the
State of California to cause cancer, birth
defects, or other reproductive harm.
Shipping and Packing List
1 - ComfortSense
®7500 , 7-day programmable
touchscreen thermostat with back plate
2 - Mounting screws (M3.5x25mm self-tapping
screws)
2 - Wall anchors
1 - Wall plate
1 - Warranty certificate
1 each - Homeowner and Installer Guides
NOTE - 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.

3
Overview
Description
The ComfortSense®7500 thermostat is an
electronic 7-day universal multi‐stage
programmable touch screen thermostat. It also
offers enhanced capabilities which include:
humidification measurement and control,
dew point adjustment control,
dehumidification measurement and control,
Humiditrol
®Enhanced Dehumidification
Accessory (EDA) capability,
equipment maintenance reminders,
worry-free memory storage feature,
menu-driven touch-screen display.
This thermostat supports heat pump or non-heat
pump units, with up to two stage heat pump and
two auxiliary stages or two stages of heating and
two stages of cooling.
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
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
icon (compressor cooling), or flame icon
(compressor heating) in the display.
Outdoor Sensor (Optional)
IMPORTANT
The outdoor sensor must be connected to oper
ate a system with a Humiditrol®accessory.
An optional (purchase separately) outdoor sensor
(X2658) is required for dual-fuel applications,

4
outdoor temperature display on the home screen,
balance points, dew point humidity control, and
with Humiditrol®EDA.
In addition to measuring and displaying outdoor
temperature, the outdoor sensor provides dew
point adjustment and control for all models. If used
with this thermostat, the sensor enables optimal
heating equipment operation via programmable
balance points.
NOTE - For proper operation of Humiditrol®EDA
applications, the outdoor sensor (X2658) MUST
be installed.
Refer to page 11 for remote sensor installation and
thermostat setting configuration.
Figure 1. Outdoor Sensor
IMPORTANT
In all applications, the ComfortSense®Model
7500 thermostat can only be used with all
residential units and approved commercial
split‐system matches, and those which meet
the following installation criteria:
installation uses 18 GAUGE thermostat
wire or larger,
thermostat wire run length DOES NOT
EXCEED 300' (91m),
load from any thermostat connection is 1
AMP or LESS.
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.

5
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.
WARNING
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.
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
Shut off 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 the optional outdoor temperature sensor
(may be separate wire pair or two wires of a
multi-wire cable).
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.

6
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:
 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.
 Non-heated (non-cooled) areas such
as an outside wall behind the
thermostat.
Figure 2. Removing Back Plate

7
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

8
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 ANCHORS
E
NOTE: INSTALLATION OF WALL PLATE IS
OPTIONAL.

9
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.

10
WIRING THERMOSTAT
Thermostat wiring connections with various units,
including dual fuel, zone control, and applications
that include the Humiditrol®Enhanced
DehumidificationAccessory (EDA). See figures 3
through 7. For whole home dehumidifier, refer to
the installation instruction for the dehumidifier.
1. Connect wiring between thermostat, indoor
unit, and outdoor unit as shown in the
appropriate wiring diagram.
2. Connect optional (purchase separately)
outdoor sensor. See Installing Outdoor
Sensor for further details and provided wiring
diagrams.
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
Tc - Outdoor Temp. Sensor Connection 1
To - Outdoor Temp. Sensor Connection 2
H - Humidification relay (to Humidifier)
D - Dehumidification relay (to DS terminal)
W2 - Second-stage heating (non-heat pump) or 4th
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 - First-stage heating or cooling
R - 24VAC power