Lennox ComfortSense 8500 Series Assembly instructions

507612-02
9/2018
Supersedes 507612-01
Installation and Setup
Guide
ComfortSense®8500 Commercial
Programmable Thermostat Series -
(14X57 and 14X58) (Zoning)

2
Shipping and Packing List
Verify the following items have been included with
in the packing:
Table 1. Packing List
Quantity Item
1CS8500 Zoning Unit
1Wall Plate
2Mounting Plate
2Wall Anchors
1Warranty
1User 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.
Table of Contents
Shipping and Packing List ........................................... 2
Thermostat Features ................................................... 3
Product Dimensions .................................................... 3
Unit Dimensions (H x W x D) ................................................... 3
Wall Plate Dimensions (H x W)................................................ 3
Wiring Specications ................................................... 3
Communication Wire .............................................................. 3
Remote Sensor Wire .............................................................. 4
Transformer Wire ..................................................................... 4
Installation ................................................................... 4
Terminal Connections.................................................. 6
Purpose ................................................................................... 6
Wiring Thermostat - (with or without CO2)............................... 6
Installing Indoor Temperature Sensors ................................... 8
Installing Occupancy Sensor .................................................. 9
Fan and Heat Relay Outputs..................................... 10
NTC or Unit Controller System Setups.......................11
NTC Setup ............................................................................. 11
M1 or M2 Unit Controller Setup ............................................. 11
M3 Unit Controller — L Connection Setup............................. 11
M3 Unit Controller — Return Air Temperature Limits Setup .. 12
CS8500 Troubleshooting ....................................................... 12
Thermostat Zoning Conguration.............................. 13
Main Screen Display Options ................................................ 13
Fan Type................................................................................ 13
Heat Type............................................................................... 13
Heating .................................................................................. 13
Damper .................................................................................. 14
Cooling................................................................................... 14
Setpoint Range and Sensor Calibration ................................ 15
Troubleshooting ..................................................................... 15
Parameters (ECTOs)................................................. 16
Menu Options ............................................................ 19
Notications .......................................................................... 19
Owner Settings ...................................................................... 20
Technician Settings................................................................ 20
System Status Descriptions....................................... 23
Error Codes and Reminders...................................... 28

3
CS8500 Features
The ComfortSense®8500 (CS8500) Commercial
Series — Zoning is a thermostat which will
communicate with the L Connection network. In
addition, it can be used as a thermostat/zone
controller. This CS8500 is available with or without
CO2sensing option.
This CS8500 can be used along with ZoneLink and
a Network Controller (NTC) to relay data to the M3
Unit controller. In-turn that data can be relayed via
either BACnet or LonTalk to a building automation
system.
Table 2. Model Information
Type Model Number Catalog
#
Without CO2
Sensor C0SNZN04FF1L 14X57
With CO2
Sensor COSNZN31FF1L 14X58
For use with Energence®commercial rooftop units
equipped with Prodigy.
CO2models can be used to control Lennox’ premium
rooftop unit Demand Control Ventilation features
based on CO2set points and conditions stored in
the unit controller.
This CS8500 is a electronic touch screen interface
devices. It also offers enhanced capabilities which
include:
• Built-in humidication monitoring - range 5% to
95% with accuracy at + 5%.
• Built-in carbon dioxide monitoring (14X58 only)
- range 400-2000 ppm, range 5% to 95% and
with accuracy at + 40 ppm + 3% or reading @
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).
Measurement accuracy + 0.5°F (-17.5°C).
• External indoor temperature sensor connections
10kΏ (47W37) or 11kΏ (94L61) — up to nine (9)
sensor in parallel may be used.
• External occupancy sensor connection (24VAC).
• Supports 50 and 60Hz operations.
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)
Wiring Specications
Communication Wire
Use one of the following Lennox communication
cables (twisted pair with shield plenum):

4
Table 3. Twisted Pair Communication Wiring
(SysBus - Yellow)
Catalog
Number Item
27M19 500 foot roll
94L63 1000 foot roll
68M25 2500 foot roll
Remote Sensor Wire
All remote sensors use standard non-shielded
thermostat 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
minimum) may be used to wire the CS8500 to the
optional wall plug 24VAC transformer 18M13 or
other eld-provided 2VA minimum, 24VAC output
transformer.
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.
Installation
1. Unpacked the CS8500 and open the case with
a thin-blade screwdriver. Place between wall
base and unit and twist to separate unit from
base.
Figure 1. Removing Back Plate
2. Select a location for the sensor about ve (5)
feet (1.5m) above the oor in an area with good
air circulation at average temperature.
3. Do not install the CS8500 where it can be
affected by:
• 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.

5
• Non-heated or non-cooled areas such as an
outside wall behind the sensor.
4. 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
c. Cut or drill a small hole approximately 3/4”
x 3/3” for wiring.
d. Pull about 3 inches of all wiring through
opening and remove outer communication
wire jacket.
e. Trim 1/4” insulation from end of each wire.
f. Drill 3/16” holes at marked locations on wall
for wall anchors.
g. Route CS8500 and outdoor temperature
sensor (optional) wiring from wall through
center openings on wall plate (use is
optional) and back plate.
Wall Plate (optional)
Thermostat
Back Plate
Run thermostat wire
through openings
h. Secure back plate and wall plate (optional)
to wall with the two provided mounting
screws.
Wall Plate (optional)
Thermostat
Back Plate
Screw
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 affect the internal temperature
and humidity sensors.

6
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).
Terminals CM- and CM+ will require wiring as
specied in “Table 3. Twisted Pair Communication
Wiring (SysBus - Yellow)” on page 4.
Table 4. Twisted Pair Communication Wiring
(SysBus - Yellow)
Terminals Purpose
DO 10VDC to damper actuator
SG Common to damper actuator
HR Heat relay
FR Fan relay
RH Relay hot
R24VAC
T
T
External indoor temperature sensor
(10KΏ or 11KΏ)
OC
OC Occupancy sensor
CM-
CM+
Zone bus communications (L
Connection)
C24VAC common
IMPORTANT!
Damage to the ComfortSense 8500 may occur if
24VAC polarity is not maintained.
Wiring CS8500 (with or without CO2)
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. Congure CS8500 and equipment for system
type and test system.

7
DO SG HR FR RH RT TOCOCCM- CM+
HEAT RELAY
COM
24VAC HOT
24VAC TRANSFORMER
WITH OVERCURRENT
PROTECTION
REQUIRED (6.5VA/
ZONE)
FAN RELAY
C
CS8500 ZONING
External
Temperatures
Sensor (optional)
CS8500 ZONING (14X57 OR 14X58) - (TEMPERATURE SENSOR AND
RELAYS CONNECTIONS)
Figure 2. CS8500 Connections (14X57 or 14X58)
2-10VDC
COM
24VAC HOT
COM
24VAC HOT
24VAC TRANSFORMER
WITH OVERCURRENT
PROTECTION
REQUIRED (6.5VA/
ZONE)
ZONE DAMPER
ACTUATOR B8
ZONE BUS-
ZONE BUS+
ZONE LINK
NEXT CS8500
SENSOR
DO SG HR FR RH RT TOCOCCM-CM+ C
CS8500 ZONING
NEXT
ZONE
CS8500 ZONING (14X57 OR 14X58) - (ZONE LINK AND DAMPER ACTUATOR)
CONNECT SHIELDS
2 CONDUCTOR #18 (MIN) TSTAT
ZONE BUS
LENNOX COMM
CABLE (PURPLE)
2 CONDUCTOR #20 (MIN)
TSTAT
RED
BLACK
BLACK
RED
Figure 3. CS8500 Zoning Connections (14X57 or 14X58)

8
Installing Indoor Temperature Sensors
Wire external sensors as illustrated below. Up to nine sensors may be used in averaging sensor applications.
Use Lennox catalog numbers 10kΏ (47W37) or 11kΏ (94L61). Sensors are not polarity sensitive.
Figure 4. 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 sensors 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 notication screen indicating an “external temperature sensor” error.

9
Installing Occupancy Sensor
When occupied the sensor will output 24VAC and 0VAC when unoccupied. Below is an example on how to
make connections for a occupancy sensor.
Figure 5. Occupancy Sensor Connections and 24VAC Transformer

10
Fan and Heat Relay Outputs
Table 5. Fan and Heat Relay Outputs
Local Heat Mode Heating Mode
First Stage Heat Second Stage Heat First and Second Stage
Heat
Fan
Type
Heat
Type
Fan
Output
Heat
Output
Fan
Output
Heat
Output
Fan
Output
Heat
Output
None None - - - - - -
Series None On - On - On -
Parallel None On - On - Off -
None Reheat -
On with unit
blower damper
to Vent
-
On with unit
blower damper
to Vent
-Off
Series Reheat On On On On On Off
Parallel Reheat On On On On Off Off
None Auxiliary - Off -On with unit
blower -Off
Series Auxiliary On Off On On Off Off
Parallel Auxiliary On Off On On Off Off
None Peripheral - On - On - On
Series Peripheral On On On On On On
Parallel Peripheral On On On On Off On

11
NTC or Unit Controller System Setups
The optional settings (M2 ECTOs or M3 Parameters)
can be adjusted using Unit Controller software, a PC
with UC software, and L Connection PC converter.
Settings do not have to be adjusted for zoned
system operation; default parameters will be used.
See the M2 and M3 application guides for additional
M2 ECTOs or M3 Parameters information.
NTC Setup
ECTO A4.07 - Set to 1. Enables remote sensor
mode in the NTC.
M1 or M2 Unit Controller Setup
The following options (M1/M2 ECTOs and M3
Parameters) must be set when the CS8500 is used.
ECTO 6.01 - Set to 4 through 7. Tells the M1/M2
unit controller what control mode and back-up set
points to use.
• 4 = Remote Demand mode with no backup.
• 5 = Remote Demand mode with local sensor
backup.
• 6 = Remote Demand mode with return air sensor
backup.
• 7 = Remote Demand mode with zone sensor
backup.
ECTO 5.27 - Set to 2, 3, 10, or 11, depending on
the options available. Zone temperature reading is
standard on all models. Setting tells the M1/M2 unit
controller where to get zone temperature, CO2, and
indoor RH input.
• 2 = Zone temperature (A2)
• 3 = Zone temperature and IAQ (A63)
• 10 = Zone temperature and indoor RH (A91)
• 11 = Zone temperature, IAQ, and indoor RH
ECTO A4.07 - Set to 1. Enables remote sensor
mode in the network thermostat controller (NTC).
M3 Unit Controller — L Connection Setup
To enable the M3 Unit Controller to use the CS8500,
use the following procedure:
1. Set CONFIGURATION ID1, position 5 to N.
2. Go to SETUP and select NETWORK
INTEGRATION.
3. Use the adjust and set values arrows to display
L-CONNECTION and press the SAVE button
to continue.
4. Adjust the L-CONNECTION ADDRESS if
required and press SAVE button to continue.
NOTE: In most cases both the L-Connection
address setting and CS8500 address
setting will need to be exactly the same.
One exception would be in multi-zone
applications.
5. CONTROL MODE will need to be set to
NETWORK THERMOSTAT. Press the SAVE
button to continue.
6. NETWORK SENSOR > CO2 (if equipped)
needs to be set to YES if needed. Press the
SAVE button to continue.

12
7. NETWORK SENSOR > RELATIVE HUMIDITY
needs be set to YES if needed. Press the
SAVE button to continue.
8. NETWORK SENSOR > TEMPERATURE will
need to be set to YES (mandatory).
9. Press the SAVE and quit the menu.
NOTE: If the CS8500 is not communicating with
the Unit Controller, cycle power to the Unit
Controller.
M3 Unit Controller — Return Air Temperature
Limits Setup
The M3 unit controller may be set up to monitor
return air temperature and interrupt the demand if
return temperature is above the heating adjustable
limits.
To enable this feature set parameters 113 and 115
locally at the Prodigy 2.0 unit controller which is
located inside Lennox rooftop unit.
• Adjusting parameter 113 enables return room
temperature limits. Default is 0 (OFF). To enable
set to 1 (ON). Go to SETTINGS > RTU OPTION
> EDIT PARAMETER = 113 (EN RET AIR TMP
LMT)
• Adjusting parameter 115 is used to interrupt a
heating demand. Default is 85.0°F. Adjustable
range is 60.0°F to 100.0°F. Go to SETTINGS
> RTU OPTION > EDIT PARAMETER = 115
(HEAT RET AIR LIMIT)
If return air temperature is above the adjustable
limits, alarm code 40 will be displayed but not stored
in memory for recall.
CS8500 Troubleshooting
1. Make sure 24VAC is supplied to the CS8500.
2. Check communication cable wiring.
3. Verify that the sensor data from the zone
sensor display matches the Prodigy Unit
Controller display.
4. For the M1 unit controller (IMC), use the IMC
MODE TEMP switch to display the data.
5. For the M2 unit controller use the DATA >
SENSORS menu to display the data.
6. For the M3 Unit Controller use the DATA > IN/
OUTPUT > SENSORS > NETWORK.

13
CS8500 Zoning Conguration
Multiple CS8500s (14X57 or 14X58) cannot be
connected directly to the Prodigy Unit Controller for
zoning applications. From the Prodigy unit controller
a connection is made to the Zone Link device and a
separate connection is made from the Zone Link to
the Network Control Panel (NCP).
Connect the L Connection PC Converter phone
cable to the NCP to congure all of the CS8500s.
When the converter is connected to the CS8500,
only the Controllers on that Zone Bus can be
adjusted.
The following optional settings (M2 ECTOs or M3
Parameters) can be adjusted using Unit Controller
software, a PC with UC software, and L Connection
PC converter. Settings do not have to be adjusted
for zoned system operation; default parameters
will be used. See the M2 and M3 application
guides for additional M2 ECTOs or M3 Parameters
information.
NOTE: One exception is the installation of a zone
terminal box. Heat Type and Fan Type
must be set.
Main Screen Display Options
• Setpoint High Resolution
• Zone Temperature High Resolution
• CO2Display
• Outdoor Temperature
• Temperature Set points
• RH
• Damper Position
• Momentary Back Light - Display back light
intensity within 30 seconds of button being
pressed.
• Continuous Back Light - Display back light
intensity all of the time.
Fan Type
Terminal Box Fan Type - none, series, or parallel.
Heat Type
Zone Heat Type - none, terminal box, auxiliary,
peripheral.
Heating
• Heating votes (1st stage: 2nd stage).
˃0:0 - No votes (no affect on system heating
demands).
˃0:1 - Vote only when sensing high zone
heating demand.
˃1:1 - Vote single weight vote during either
low or high zone heating demand1:2 - Vote
single weight during low zone heating
demand, vote double weight during high
demand.
• Heating Differential 1 - Denes the temperature
below setpoint that creates a low heating
demand.
• Heating Differential 2 - Denes the temperature
below setpoint that creates a high heating
demand. Must be greater than Differential 1.

14
• Heating Deadband - Denes the temperature
above demand start temperature that ends the
demand.
• Heating Integration Constant - The integration
time, in seconds, that is used in the damper
position control algorithm during a zone heating
demand.
• Heating Proportional Constant - The proportion
band, in degrees Fahrenheit, that is used in the
damper control algorithm during a zone heating
demand.
• Heating Supply Air Temperature Differential - The
amount warmer that the supply air temperature
must be than the zone temperature, to be used
for a heating demand.
Damper
• Minimum zone damper position.
• Maximum zone damper position.
• Zone damper ventilation position.
• Zone control loop reset position (damper starting
position).
• Zone CO2setpoint for ventilation (IAQ / indoor air
quality ventilation setpoint 500-2000ppm of CO2.
Cooling
• Cooling Votes (1st Stage; 2nd Stage)
˃0:0 - No votes (no affect on system cooling
demands).
˃0:1 - Vote only when sensing high zone
cooling demand.
˃1:1 - Vote single weight vote during either
low or high zone cooling demand.
˃1:2 - Vote single weight during low zone
cooling demand, vote double weight during
high demand.
• Cooling Differential 1 - Denes the temperature
above setpoint that creates a low cooling
demand.
• Cooling Differential 2 - Denes the temperature
above setpoint that creates a high cooling
demand. Must be greater than Differential 1.
• Cooling Deadband - Denes the temperature
below demand start temperature that ends the
demand.
• Cooling Integration Constant - The integration
time, in seconds, that is used in the damper
position control algorithm during a zone cooling
demand.
• Cooling Proportional Constant - The proportion
band, in degrees Fahrenheit, that is used in the
damper control algorithm during a zone cooling
demand.

15
Setpoint Range and Sensor Calibration
There is a set point adjustment range except when
the zone is in manual mode.
• Internal temperature offset calibration.
• External temperature offset calibration.
• RH offset calibration.
Troubleshooting
Make sure the CS8500 is displayed on the NCP
network list. If the CS8500 is not displayed:
1. Make sure 24VAC is supplied to the CS8500.
2. Make sure the CS8500 address setting
is different from all other CS8500s on its
ZoneBus.
3. Check communication cable wiring: the red and
black leads should be connected to CS8500’s
CM- and CM+ terminals.
• Make sure connections are correct at the
Zone Link and unit.
• Verify communication using LEDs on the
Zone Link and IMC or NTC.
4. Make sure the IMC or NTC is setup for zoning
application. Refer to the Zone Link installation
instruction.
5. Re-poll the network at the NCP (see NCP
user’s manual).
Verify that the sensor data from the CS8500 display
matches the NCP zone data screen.

16
Parameters (ECTOs)
Table 6. Parameters
NAME DESCRIPTION MIN MAX DEF. UNIT Notes
D0 DISPLAY_
OPT
bit Option
71, Disable override
button
6 Damper
5 RH
4 Set points
3Outdoor Temperature
2 CO2
1Zone Temp. High
Resolution
0Setpoint High
Resolution 0 255 8
D1 BACKLIGHT Upper nibble: bright setting, lower
nibble: dim setting
0 255 98($62)
D2 SP_ADJ_
RNG Setpoint Adjustment Range 0 40 8
0 10 2 °F
D3 IT_CAL Calibration factor, internal temperature -5 5 0 °F
236 20 0
D4 ET_CAL Calibration factor, external
temperature
-5 5 0 °F
236 20 0

17
Table 6. Parameters
NAME DESCRIPTION MIN MAX DEF. UNIT Notes
D5 RH_CAL Calibration factor, RH sensor -5 5 0 %
251 5 0
D6 CO2_CAL Calibration factor, CO2sensor
-200 200 0 PPM Last of the
Sensor Only
ECTOs.
236 20 0
D7 FAN_TYPE None, series, parallel 0 2 0
None Parallel None
D8 HEAT_TYPE None, reheat, auxiliary, peripheral 0 3 0
None Peripheral None
D9 DAMP_MIN Minimum damper position 0 100 20 %
D10 DAMP_MAX Maximum damper position 0 100 100 %
D11 DAMP_VNT Damper ventilation position 0 100 60 %
0 255
D12 DAMP_RST Damper control loop reset position 0 100 50 %
0 255
D13 IAQ_SP CO2setpoint to go to vent position 50 201 201 201 is Off.
D13 IAQ_SP CO2setpoint to go to vent position 500 2000 2000 PPM
Name DESCRIPTION MIN MAX DEF. UNIT Notes
D14 VOTING_
COOL (1st stage: 2nd) 0:0, 0:1, 1:1, 1:2 0 3 3
0:00 1:02 1:02 Votes

18
Table 6. Parameters
NAME DESCRIPTION MIN MAX DEF. UNIT Notes
D15 CLG_DF First cooling setpoint differential 0 3 0.5 °F
0 12 2 Counts
D16 CLG_DF2 2nd cooling setpoint differential 0 3 1 °F
0 12 4 Counts
D17 CLG_DB Cooling deadband 1 4 2 °F
4 16 8 Counts
D18 CLG_TI Integration constant, cooling
100 2550 1200 SEC 0 is no
integration
term.
10 255 120 Count
D19 CLG_PB Proportional constant, cooling 2 30 4 °F
0 or 31 is no
PI control;
damper
operates
at reset
value.
D20 VOTING_
HEAT (1st stage: 2nd) 0:0, 0:1, 1:1, 1:2 0 3 3
0:00 1:02 1:02 Votes
D21 HTG_DF First heating setpoint differential 0 3 0.5 °F
0 12 2 Counts
D22 HTG_DF2 2nd heating setpoint differential 0 3 1 °F
0 12 4 Counts
D23 HTG_DB Heating deadband 1 4 2 °F
4 16 8 Counts

19
Table 6. Parameters
NAME DESCRIPTION MIN MAX DEF. UNIT Notes
D24 HTG_TI Integration constant, heating
100 2550 1200 SEC 0 is no
integration
term.
10 255 120 Count
D25 HTG_PB Proportional constant, heating
2 30 4 °F 0 or 31 is no
PI control;
damper
operates
at reset
value.
2 30 4
D26 SA_DF Supply air differential, determines if
suitable for heating 0 20 10 °F
Menu Options
During initial power up of the CS8500, the technician
settings menu will appear rst. The S-bus address
option must be selected and a address set before
you can proceed. Use either the minus/plus buttons
or numeric keypad to enter the address. After the
s-bus address is set, press the back button to return
to the technician settings menu.
Menu includes the following selections:
• Notications
• Owner Settings
• Technician Settings
Notications
When a system error occurs, a pop-up screen will
appear indicating the condition.
• Error code notication pop-up can be dismiss by
pressing the OK button. Contact the contractor to
resolve the issue.
Any active history for notications are listed under
settings > notication.
1. Press the down arrow icon next to the
notication to expand the notication for further
details.
2. Press the contractor info option for assistance.

20
Owner Settings
See the included user guide for further details.
Technician Settings
If you need to access the technician settings option
in the future, go to the home page, press menu >
technician settings and enter technician PIN code
864. This code cannot be changed.
1. S-Bus Address
Options are 0 through 31. Select address and
press the set button to save the setting and
return to the technician setting screen.
2. Display on Home Screen
Turn ON or OFF for the followings options:
• CO2value (only on models with CO2
sensor).
• Box heater state.
• Box fan state.
• RTU function state.
• Service required alert.
Factory default is OFF for all of the above
options. Press < in the upper left-hand corner
of the screen to return to the technician settings
menu.
3. Contractor Information
Information to be completed for this option is
name, address, phone, email and website.
Press <in the upper left-hand corner of the
screen to return to the technician settings
menu.
4. Temperature Sensor Cong.
Temp. Sensor source by default is set to
internal temp. sensor. The other option is
external temp. sensor(s). When external temp.
sensor(s) is selected, the following settings
need to be congured;
• Number of external temp. sensor: Default is
1, and up to nine can be selected.
• Type of external sensor: Options are 10k
sensor type 2 (47W37) or 11k sensor type 2
(94L61). Default sensor type is 10k sensor
type 2.
Press < in the upper left-hand corner of the
screen to return to the technician settings
menu.
5. Offsets
• Internal temp. Sensor offset: Offset for the
built-in temperature sensor (internal) is -5°F
to +5°F. Default is 0°F.
• External temp. sensor offset (only
selectable when external temp. sensor is
selected under temperature sensor cong.):
Offset for the external temp, sensor is -5°F
to +5°F. Default is 0°F.
• Humidify offset: The setting option for this is
-10% to +10%. Default is 0%.
• CO2sensor offset: Offset for the CO2
sensor is -200 ppm to +200 ppm. Default is
0 ppm. (Only on models with internal CO2
sensor.)