Lennox 24K56 User manual

©2023 Lennox Industries Inc.
Dallas, Texas, USA
INDOOR AIR QUALITY
COMMERCIAL INDOOR AIR QUALITY
SENSOR REPLACEMENT KIT
508350-01
01/2023
INSTALLATION INSTRUCTIONS FOR COMMERCIAL INDOOR AIR QUALITY
SENSORS REPLACEMENT KIT (24K56)
IMPORTANT
Improper installation, adjustment, alteration, service or
maintenance can cause personal injury, loss of life, or damage
to property.
Installation and service must be performed by a licensed
professional installer (or equivalent) or a service agency.
IMPORTANT
Take care not to drop the IAQ Sensor during unpacking.
Dropping device could result in damage to internal components
which could render it unusable.
IMPORTANT
Unpacking required. Remove all protective packing material
from the assembly. Packing material should be disposed of
properly.
KEEP OUT OF REACH CHILDREN
WARNING
Electric Shock Hazard. Can cause injury or death.
Unit must be properly grounded in accordance with
national and local codes.
Line voltage is present at all components when
unit is not in operation on units with single-pole
contactors. Disconnect all remote electric power
supplies before opening access panel. Unit may
have multiple power supplies.
CAUTION
Sharp edges hazard. Sharp edges can cause injuries. Use
protective gloves when grasping equipment edges.
Table of Contents
Shipping and Packing List ................................................... 1
Overview .............................................................................1
Shipping and Packing List
Package 1 of 1 contains:
1 - Commercial Wireless IAQ Sensor (for installation in either the
discharge or return air locations of unit)
1 - Warranty and Installation instruction
Overview
The wireless system employs the following components:

• Plenum-rated Bluetooth Low Energy (BLE) antenna which
will assist in boosting the signal from Communication Mod-
ule to:
»CORE Service App
»Wireless Commercial IAQ sensors
• Return air mounted antenna reduces signal loss from roof
and connected to gateway system via coax cable.
®

• Connects to the Lennox®CORE Unit Controller through the
W4 Communication Module.
• Used for installation of wireless sensors, service, and main-
tenance of applicable rooftop units.
CORE Unit Controller with W4 Communication Module.................... 1
Lennox®CORE Service Application Used for adding IAQ Sensors to
the CORE Control System.................................................................... 1
Indoor Air Quality Sensor..................................................................... 1
Commercial IAQ Sensor Button and LED Indicators.............. 2
IAQ Sensor Dimensions ....................................................... 2
Status Indicator Light Color Descriptions .......................................... 2
Sensor Replacement Procedure........................................... 2
Removing and Installing Sensor(s) from Unit .................................... 2
A-Box Sensor Locations.....................................................................2
B-Box Sensor Locations .....................................................................2
C-Box Sensor Locations.....................................................................3
Removing Failed Sensor(s) from CORE Control System using the
CORE Service App. ............................................................................... 3
Adding New Sensor(s) to CORE Control System using the CORE Ser-
vice App ................................................................................................ 3
IAQ Sensor Alarm Codes ..................................................... 3
FCC Compliance Statement ................................................. 4
FCC RF Exposure Information ............................................. 4

2

Used to measure PM2.5 and TVOC counts in return and
discharge air locations.
• Two sensors are required per roof top unit
• Units are powered by 24VAC only
• Wireless only

For return side mounted
IAQ Sensor, remove TVOC label
For supply side mounted
IAQ Sensor, do not remove TVOC label


9.0”
4.2”
1.15”


NOTE: Light is only on when there is an issue with signal
strength.

 Light Color 
Normal Solid Green Solid green indicates device is
functioning properly.
Pairing Flashing Blue Flashing blue indicates the unit is in
pairing mode.
Communication
Error Solid Red Solid red indicates lost communication error.
Other Errors
Flashing Red PM Sensor error
Flashing Green Low signal strength
Solid Blue VOC Sensor error


If a sensor fails, use the following procedures to physically
remove the failed sensor from the unit. All units will have two
IAQ sensors installed, one in the return air and the second one
in the supply side.
The sensors are secured to the tray by two screws. The power
cable assembly will need to be detached from the connector
located on the bottom of the sensor as well.

Location of both IAQ Sensors



IAQ Sensor (Return Side)
IAQ Sensor (Supply Side)
Compressor Wrapper



3

Location of both
the Supply and Return
IAQ Sensors
Always install IAQ
Sensor so Status Indicator
is viewable.




The sensor (s) must be removed from the CORE Control System
before adding any new sensors. This can be accomplished by
using the CORE Service App.
1. Go to  > Network Integrations > Wireless Sensor
 > Wireless Sensor Network.
2. From the Network Nodes list, select the IAQ sensor that is
being replaced.
3. On the Sensor Information Screen, select the Remove
Sensor option at the bottom of the screen.
4. Type in the sensor name that is to be removed and select
Proceed.


Wireless operation is ONLY compatible with M4 Unit Controller.
To commission a wireless sensor, you must rst pair the CORE
 to the applicable unit.
IMPORTANT
 interrupt the adding process of the wireless sensors.
If interrupted the sensor will need to be factory-reset.
Maximum of two wireless sensors can be provisioned per unit.
1. Open the CORE Service App and navigate to  >
() Network Integration > Wireless Sensor Network
 > Wireless Sensor Network.
NOTE: Provisioning the Wireless Sensor Network is only re-
quired once. If you have already completed this step,
proceed to step 3. Select Provision, and select NEXT to
proceed. Could take up to two minutes to complete the
provisioning. Once "RTU Provisioned" appears on the
screen, select DONE to proceed.
2. Click Add node on the Network Nodes screen. This triggers
the CORE Service App to scan for both the WIAQ Return
Sensor and WIAQ Discharge Sensor.
NOTE: Turn o any other BLE mesh devices that have not been
added yet. Only one sensor can be added at a time.
3. Follow the prompts on the screen to nish the adding pro-
cess.
4. Verify that the  displays the “Node Provi-
sioned” on the Provision Sensor Network.
5. Verify if CORE Service app is showing PM2.5 counts for both
return and supply mounted sensors and TVOC counts from
return mounted sensor



ALARM
  
522 WCS The W4 lost connection with all WCS sensors
523 WIAQ RETURN SENSOR ERROR Data out of range or internal error with WIAQ return sensor.
524 WIAQ DISCHARGE SENSOR ERROR Data out of range or internal error with WIAQ discharge sensor.
525 WIAQ RETURN SENSOR COMM The W4 has lost communication with WIAQ return sensor.
526 WIAQ DISCHARGE SENSOR COMM The W4 has lost communication with WIAQ discharge sensor
527 WIAQ GENERAL ERROR
Alarming value gives indication of what caused alarm. There are currently 3 possible alarming
values.
• Alarming value of 0 means too many WIAQ sensors detected (there can
only be 2).
• Alarming value of 1 means too many WIAQ return sensors detected (there
can only be 1).
• Alarming value of 2 means too many WIAQ discharge sensors were
detected (there can only be 1).

4
FCC Compliance Statement
This device complies with Part 15 of the FCC Rules. Operation
is subject to the following two conditions:
1. This device may not cause harmful interference.
2. This device must accept any interference received, including
interference that may cause undesired operation.
NOTE: This equipment has been tested and found to comply
with the limits for a Class A digital device, pursuant to
Part 15 of the FCC Rules. These limits are designed to
provide reasonable protection against harmful interfer-
ence when the equipment is operated in a commercial
environment. This equipment generates, uses, and can
radiate radio frequency energy, and if it is not installed
and used in accordance with the instruction manual, it
may cause harmful interference to radio communica-
tions. Operation of this equipment in a residential area
is likely to cause harmful interference, in which case the
user will be required to correct the interference at their
own expense.

Any modications made to this device that are not ap-
proved by Lennox International may void the authority
granted to the user by the FCC to operate this equip-
ment.

This equipment complies with FCC radiation exposure limits
set forth for an uncontrolled environment. In order to avoid the
possibility of exceeding the FCC radio frequency exposure
limits, human proximity to the antenna shall not be less than
20cm during normal operation.