LENNOX 24C58 Carbon Dioxide Sensor Instruction Manual
- June 13, 2024
- Lennox
Table of Contents
CONTROLS
KITS AND ACCESSORIES
CARBON DIOXIDE (CO2)
SENSOR KIT
INSTALLATION INSTRUCTIONS FOR CARBON DIOXIDE (CO) SENSOR (24C58)
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.
Shipping and Packing List
Check contents for shipping damage. The receiving party should contact the
last carrier immediately if shipping damage is found.
Package 1 of 1 contains:
| Description | Quantity |
|---|---|
| CO2 Sensor With Sub-base | 1 |
| Wiring Diagram | 1 |
IMPORTANT
These instructions are intended as a general guide and do not supersede local codes in any way. Authorities having jurisdiction should be consulted before installation.
Dimensions
Installation
sub-base and sensor
- Insert a thin, flat blade screwdriver into each of the two slots at the bottom of the module to release the two locking tabs.
- Tilt the cover out and away from the subbase to release the two locking tabs.
- Insert the wire in the required terminal location and tighten the screw to complete the termination.
- Align the top edge and swing down the module until engaged with the lower retaining tabs to reinstall the sensing module on the subbase.
mounting the sub-base
Use the mounting subbase as a template to mark mounting holes or mount to a
junction box on a wall.
The module can be mounted using the standard utility conduit box with No.6
(3.5 mm) screws or on a 60 mm wall outlet box.
wiring instructions
The location and connections to the Lennox rooftop units with the unit controller are shown in Figures 4 and 5.
The connections to the Lennox rooftop units without the unit controller are shown in Figure 6.
For applications that require the Lennox CO2 sensor interface to a non−Lennox controller, refer to controller manufacturer’s instructions.
- 24 AWG Maximum for Copper Wire Terminals
co2 threshold settinge/led alert
*Figure 7 shows 1100 ppm settings.
| SW1 | SW2 | SW3 | Indicator (ppm) | Output Type |
|---|---|---|---|---|
| ON | ON | ON | 1200 | 2 -10V |
4 – 20mA
ON| OFF| ON| 1100
OFF| ON| ON| 1000
OFF| OFF| ON| 800
ON| ON| OFF| 1200| 0 – 10V
4 – 20mA
ON| OFF| OFF| 1100
OFF| ON| OFF| 1000
OFF| OFF| OFF| 800
Table 1. DIP Switch Settings
ABC LOGIC™ SELF CALIBRATION SYSTEM
This feature allows the sensor to continually recalibrate itself when the indoor CO2 concentrations drop to outside levels while the building is unoccupied. A building must be unoccupied for four hours or more for this self−calibration system to operate properly. Under these conditions, ABC Logic should maintain sensor calibration over the lifetime of the sensor.
Specifications
| Specification | Description |
|---|---|
| Sensing Method | Automatic Background Calibration (ABC), Non-Dispersion |
Infrared (NDIR)
Measurement Range| 0-2000 ppm
Accuracy| ± (30 ppm +3% of reading) within the range 0-2000 ppm ± (75 ppm at a
600 – 1000 ppm)
Stability| 15 Year, Accuracy drift over lifetime: ± 50 ppm
Warm-up Time| < 20 seconds
Operating Conditions| +32°F to +122°F (0°C to +50°C), 0-95% RH (non-
condensing)
Storage Conditions| -40°F to 158°F (-40°C to 70°C)
Output (Analog)| 0/2-10 VDC (resistive load greater than 5000 ohms), 4-20 mA
(resistive load less than 500 ohms)
Power Supply Requirements| 24 VAC/DC ±20%, 50/60 Hz (Class 2)
Temperature Dependence| 2.5ppm/ °C (0-50°C)
Pressure Dependence| N/A
Certifications| CE and RoHS compliant
Signal Update| Every 2 seconds
Flammability Classification| UL94-VO
Thermistor Type| 10k NTC in serial with 1k resistor
Power Consumption| Max 3W
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