Lennox ComfortSense 8500 Series Montageanleitung

507611-03

7/2019

Supersedes 11/2018

Installation and Setup

Guide

ComfortSense®8500 Commercial

Programmable Thermostat Series -

Table of Contents

Shipping and Packing List..................................3

CS8500 Features..................................................3

Product Dimensions............................................4

Unit Dimensions (H x W x D) ......................................... 4

Wall Plate Dimensions (H x W) ...................................... 4

Wiring Specications..........................................4

Communication Wire ..................................................... 4

Remote Sensor Wire ..................................................... 4

Transformer Wire............................................................ 4

Installation............................................................5

Terminal Connections .........................................6

Purpose.......................................................................... 6

Wiring CS8500 (with or without COSensor)................. 7

Installing Indoor Temperature Sensors ......................... 7

Installing Occupancy Sensor ......................................... 7

iCON™ by Lennox / L Connection

Equipment............................................................8

Network Thermostat Control (NTC) Setup ..................... 8

M1 / M2 Unit Controller Setup........................................ 9

M1 / M2 Unit Controller - Control Mode and

Backup Set Points Setup ............................................... 9

M3 Unit Controller Setup................................................ 9

CS8500 Setup.............................................................. 10

BACnet with M3 Unit Controller.......................10

Network Topology......................................................... 10

CS8500 Set Point Change ........................................... 10

CS8500 Occupancy Override ...................................... 11

BACnet Canceling Override ......................................... 11

Sensor Inputs ............................................................... 11

M3 Unit Controller Setup.............................................. 11

CS8500 Setup.............................................................. 13

CS8500 Sensor Failure................................................ 13

Functions Not Supported ............................................. 13

CS8500 Troubleshooting.............................................. 13

M3 Unit Controller - Setting Return Air

Temperature Limits ...........................................14

Menu ...................................................................14

Technician Settings ...................................................... 14

Parameter Settings Based on System Conguration... 15

Parameter Descriptions................................................ 16

System Status Descriptions.............................19

Error Codes and Reminders.............................23

Shipping and Packing List

Verify the following items have been included with

in the packing:

Table 1. Packing List

Quantity Item

1CS8500 (non-zoning) with back

plate

1Wall plate

2Wall anchors

2Screws (M3.5x24mm self-tapping)

1Warranty

1User guide

1Setup and installation guide

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.

CS8500 Features

The ComfortSense®8500 (CS8500) is a commer-

cial, electronic, 7-day, multi-stage, programmable,

touchscreen thermostat. This CS8500 provides

temperature control for packaged gas/electric and

electric/electric for up to 4-heat / 4-cool multi-stage

roof top unit systems (not for heat pump systems).

• Models are available with or without COsensing

capabilities.

• For use with Energence®commercial rooftop

units equipped with Prodigy®.

• For use with iCON Intelligence Connected™ by

Lennox®building-automation solution.

• COmodels can be used to control Lennox’

premium rooftop unit Demand Control Ventilation

features based on COset points and conditions

stored in the unit controller.

The CS8500 also feature enhanced capabilities

    -

cation and control, economizer control and custom

reminders.

• 



• Built-in carbon dioxide monitoring version only





77°F (25°C). Sensor has built-in self-calibration

algorithm.

• Temperature monitoring - two internal

thermistors, range 32°F (0°C) to 99°F (37°C).



• External indoor temperature sensor connections



sensor in parallel may be used.

• External occupancy sensor connection (24VAC).

• 

• Maximum load per terminal - 1 amp

• Power supply range 18 to 30 VAC

• 

Product Dimensions

Unit Dimensions (H x W x D)



x 22mm)

Wall Plate Dimensions (H x W)



Wiring Specications

Communication Wire

Use one of the following Lennox communication ca-

bles (twisted pair with shield plenum):

Table 2. Twisted Pair Communication Wiring

(S-Bus - Yellow)

Catalog

Numbers Item

27M19 500 foot roll

 1000 foot roll

 2500 foot roll

CAUTION

This is a 24VAC low-voltage sensor. Do not install

on voltages higher than 30VAC.

Do not short (jumper) across terminals to test

installation. This will damage the sensor and void

the warranty.

Remote Sensor Wire

All remote sensors use standard non-shielded ther-

mostat wiring; 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).

Transformer Wire

Standard thermostat wire (one pair 20 AWG mini-

mum) may be used to wire the CS8500 to the op-

tional wall plug 24VAC transformer (18M13) or other

     -

former.

Installation

1. Unpacked the CS8500 and open the case

with a thin-blade screwdriver (see “Figure 1.

Removing Back Plate” on page 5).

2. Place between wall base and unit and twist to

separate unit from base.

Figure 1. Removing Back Plate

3. 



good air circulation at average temperature.

4. Do not install the CS8500 where it can be

󰀨

• Drafts or dead spots behind doors and in

corners.

• Entrance or automatic doors.

• Heat generating equipment such as kitchen

equipment.

• 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 or non-cooled areas such as an

outside wall behind the sensor.

5. Use the following steps:

a. Determine location using best practices.

b. Use the provided wall plate as a template

to determine location cutout for wiring and

location for wall anchors.

NOTE: The use of the provided wall plate is

optional.

Wall Anchor Locations

Use a level to align wall plate horizontally

Cutout location

for thermostat

wiring

Figure 2. Level Wall Plate

c. Cut or drill a small hole approximately 3/4”

x 3/4” for wiring.

d. Pull about three inches of all wiring through

opening and remove outer communication

wire jacket.

e. Trim 1/4” insulation from end of each wire.

f. 

for wall anchors.



g. Route the CS8500 and outdoor tempera-

ture sensor (optional) wiring from wall

through center openings on wall plate (use

is optional) and back plate (see “Figure 3.



Wall Plate (optional)

Thermostat

Back Plate

Run thermostat wire

through openings

Figure 3. Route Wiring

h. Secure back plate and wall plate (option-

al) to wall with the two provided mounting

screws.

Wall Plate (optional)

Thermostat

Back Plate

Screw

Figure 4. Secure Back Plate

NOTE: Remember to seal the hole in the wall with

a suitable material to prevent drafts from

entering the zone sensor case. Not doing

so could aect the internal temperature

and humidity sensors.

Terminal Connections

External sensors use standard thermostat wiring;

and may be wired using two wires of a multiple wire

cable. Wire run should not exceed 300 feet (100m).

        -

enced in “Table 2. Twisted Pair Communication Wir-

ing (S-Bus - Yellow)” on page 4.

Table 3. Twisted Pair Communication Wiring

(S-Bus - Yellow)

Terminals Purpose

R24VAC

T T External indoor temperature sensor



OC OC Occupancy sensor

 S-Bus communication

C24VAC common

IMPORTANT!

Damage to the ComfortSense 8500 may occur if

24VAC polarity is not maintained.

Wiring CS8500 (with or without COSensor)

Below are the terminal designations and a general

description of their purpose.

1. Connect wiring between CS8500 and

applicable controller.

2. Connect external sensors if applicable.

3. Seal the hole in the wall with a suitable material

to prevent drafts from entering the CS8500

case.

4. 

type and test system.

24VAC transformer with

overcurrent protection

required (6.5VA/Zone)

ComfortSense 8500

Figure 5. CS8500 Connections (both versions)

Installing Indoor Temperature Sensors

Wire external sensors as illustrated below. Up to

nine sensors may be used in averaging sensor

     



sensitive.

Figure 6. Temperature Sensor Wiring

(parallel)

The CS8500 will calculate the average temperature

readings from all connected external temperature

sensors. If any of the sensors malfunction, they

may still report a temperature value. Only when the

average value of the connected temperature sen-

sors including any malfunction sensor(s) is lower

than -40°F, or higher than 158°F, will the CS8500

determine that an external temperature sensor(s)

has failed and switch automatically to the CS8500’s

internal temperature sensor. A error message will be

displayed on the home screen and under the noti-

     

sensor” error.

Installing Occupancy Sensor

The occupancy sensor will output:

• 24VAC in occupied mode.

• 0VAC in unoccupied mode.

The following is an example on how to make connections for a occupancy sensor.

Figure 7. Occupancy Sensor Connections and 24VAC Transformer

iCON / L Connection Equipment

A single CS8500 can be connected directly to the

S-Bus connection on the Prodigy Unit Controller.

The optional settings (M2 ECTOs or M3 Parame-

ters) can be adjusted using Unit Controller software,

a PC with UC software, and L Connection PC con-

verter.

All parameters can also be set directly at the Unit

Controller. Refer to the applicable unit controller

application guide to edit the required ECTOs or pa-

rameters.

Network Thermostat Control (NTC) Setup

• NTC ECTO A4.07 is factory set to option 0

(local). In this system mode, the NTC will

operate the unit based on input from a local

sensor.

• NTC ECTO A4.07 must be set to option 1

(remote) if an L Connection communication

compatible ComfortSense 8500 is used. In

this system mode, the NTC will operate the unit

based on input from the ComfortSense 8500.

M1 / M2 Unit Controller Setup

From the main menu, perform the following naviga-

tion through the menus to set the S-Bus address for

L Connection.

Go to: Settings > Control > Guided Setup > Enter

Advanced Guide Setup > Set Control >

LCONN > ADDR

Enter the S-Bus address for L Connection. Once

done select the Set option to save the settings.

M1 / M2 Unit Controller - Control Mode and

Backup Set Points Setup

The following unit controller ECTOs must be set

when using the CS8500.

ECTO 5.27 - This is use and depends on the avail-

able sensors on the CS8500. Room temperature

reading is standard on all models. The following set-

ting instructs the M1/M2 unit controller what source

to get zone temperature, CO, and indoor RH input.

• 2 = Room temperature (A2)

• 

• 10 = Room temperature and indoor RH (A91)

• 11 = Room temperature, IAQ, and indoor RH

ECTO 6.01        

controller control mode and back-up set points to

use. Options are:

• 1 = Zone sensor mode with no backup.

• 2 = Zone sensor mode with local sensor backup.

• 3 = Zone sensor mode with return air sensor

backup.

M3 Unit Controller Setup

From the main menu, perform the following naviga-

tion through the menus to set the S-Bus address for

L Connection.

1. Go to SETUP > NETWORK INTEGRATION >

L-CONNECTION > LCONN ADDRESS.

2. Enter the desired LCONN ADDRESS (S-Bus)

and select SAVE to continue.

3. Set CONTROL MODE = ROOM SENSOR and

select SAVE to continue.

4. NETWORK SENSOR CO2(if equipped)

needs to be set to YES (if choosing COfrom

CS8500). Select SAVE to continue.

5. RELATIVE HUMIDITY needs to be set to YES

(if choosing RH from CS8500). Select SAVE

to continue.

 TEMPERATURE will need to be set to YES (if

choosing temperature from CS8500).

7.      

questions until it returns you to the NETWORK

INTEGRATION menu option.

NOTE: Once the conguration is saved, then

S-Bus communication will be lost and

alarm 110 (low priority) will be raised. This

will be cleared automatically when any

demand goes to M2/M3.

CS8500 Setup

1. From the CS8500’s home screen, go to MENU

> TECHNICIAN SETTINGS and enter 864 and

press OK to proceed.

2. Both the RTU and the CS8500 must be set

to the same S-Bus address. The rooftop

unit’s default address is 2 unless it has been

changed. Set the CS8500 S-Bus address to

match the rooftop unit’s S-Bus address.

3. Set operation with Smart Hub (central hub or

NCP) to ON/OFF.

• If the CS8500 is setup with the rooftop units

with a NCP set this to ON.

• If the CS8500 is setup with the rooftop units

and no NCP set this to OFF.

• If the CS8500 is being used in an iCON by

Lennox automation system with a Central

Hub, set this to ON.

NOTE: It may take 30 seconds up to two minutes

for the CS8500 to connect.

BACnet with M3 Unit Controller

This section describes how a CS8500 operates in a

BACnet environment with a M3 unit controller.

Network Topology

• All rooftop units are connected to the BACnet

front-end.

• Each rooftop unit is connected to one CS8500.

• The CS8500 communicates with the rooftop

units using the Lennox proprietary S-Bus

protocol.

CS8500 Set Point Change

The BACnet front-end provides the occupied and

unoccupied set points to the roof top unit.

The roof top unit (RTU) sends the same set points

to CS8500. The rooftop units uses these set points

until the CS8500 provides a new set point. When the

user changes the set point at the CS8500, it com-

municates the same to M3 unit controller. Upon re-

ceiving this information, the M3 unit controller starts

an override timer and uses the new set points until

the timer expires.

• While the timer is active, if BACnet queries the

M3 unit controller, it will be informed that the

rooftop units is using the override set points.

• When the timer expires, both the M3 unit

controller and CS8500 reverts to the set points

provided by BACnet.

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