Lennox ComfortSense 7500 Assembly instructions

ComfortSense®7500 Commercial 507506-02

6/2018

Supersedes 5/2017

Installation and Setup Guide

Table of Contents

Shipping and Packing List 2...............

Description 2...........................

Installation 3............................

Menu 8................................

Installer Settings 9.......................

Dehumidify Mode 24......................

Economizer 26...........................

Unit Part (Catalog) & Serial Numbers 27......

Memory Protection 27.....................

Start-Up Sequence of Operations 28.........

Diagnostic Information 29..................

Reminder Information 32...................

Supported Configurations 33...............

Installation Checklist 34....................

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

Description

The ComfortSense®7500 commercial thermostat 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.

SEconomizer support

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

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 9 for sensor

wiring and configuring sensor settings under

Installer Settings menu.

WARNING

Improper installation, adjustment, alteration, ser

vice 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 equiva

lent) or service agency.

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 thermostat.

All wiring must conform to local and national build

ing 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 war

ranty.

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.

SShut off all power to system before

installing.

SRead this entire document, noting which

instructions pertain to your equipment and

system requirements.

SMake sure that all wiring conforms to local

and national building and electrical codes and

ordinances.

SUse 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).

SEnsure load from any thermostat

connection is less than 1 AMP.

DO NOT

SInstall On voltages higher than 30VAC.

SShort (jumper) across terminals on the gas

valve or at the system control to test

installation. This will damage the thermostat

and void the warranty.

SInstall on outside walls or in direct sunlight.

SExceed thermostat wire run length

greater than 300 feet (91m).

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 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.

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”

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

1/4”

TRIM 1/4” INSULATION FROM

END OF EACH WIRE

USE UNIT WALL PLATE AS TEMPLATE TO MARK

DESIRED MOUNTING HOLE LOCATIONS ON WALL

(USE A LEVEL) ALIGN WALL PLATE

DRILL 3/16” HOLES AT MARKED LOCATIONS

ON WALL FOR WALL ANCHORS

NOTE: INSTALLATION OF WALL PLATE

IS OPTIONAL.

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.

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

9 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/B - Heat/Cool active reversing valve

F - Economizer or other fault detection

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

IMPORTANT

In all applications, the commercial version of the

ComfortSense

®Model 7500 thermostat can only

be used if the following installation criteria is met:

Sinstallation uses 18 GAUGE thermostat

wire or larger,

Sthermostat wire run length DOES NOT EX

CEED 300' (91m),

Sload from any thermostat connection is 1

AMP or LESS.

Settings

performance report

notifications 13

edit schedules

settings

Figure 2. Menu Screen

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.

installer settings

confirm

installer settings must be set

by qualified person.

Figure 3. Installer Menu Screen Confirmation

Installer Settings

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



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

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 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 five remote

indoor temperature sensors. Users have 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 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.

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