LENNOX 23V86 Carbon Dioxide Sensors Instruction Manual

LENNOX 23V86 Carbon Dioxide Sensors Instruction Manual

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. Receiving party should contact the last carrier immediately if shipping damage is found.
Package list for either catalog number contains the following:

Description

|

Quantity

---|---

CO2 Sensor: Circuit Board and Backplate

| 1
Cover|

1

Mounting Screws

| 2
Set Screws|

2

Installation Instruction (wiring diagrams included)

|

1

Options
CO2 Wall Mount, White Case, No Display (23V86)
CO2 Duct Mount, Black Case, No Display (23V87)

IMPORTANT
These instructions are intended as a general guide and do not supersedes local codes in any way. Authorities having jurisdiction should be consulted before installation.

Installation

Mounting Bracket and Sensor

1. Make the appropriate wiring preparations.

2. Use the mounting bracket as a template to mark mounting holes or mount to a junction box.

3. Run the wiring through the backplate and make necessary wire connections.

4. Mount the cover on the sensor. Secure the cover to the sensor backplate with the two provided set screws using a 1/16” hex driver.

Wiring Instructions

The location and connections to the Lennox rooftop units with the unit controller are shown in figures 1 and 2. Wire from sensor terminal COM should be spliced to provide ground and signal common.

Figure 1. Field Wiring – 150’ (46m) or Shorter Runs

Figure 2. Field Wiring – 150’ (46m) or Longer Runs

The connections to the Lennox rooftop units without the unit controller are shown in figure 3.

Figure 3. Field Wiring for KC/KG/KH, ZC/ZG/ZH and ELA units without Unit Controller

For applications that require the Lennox CO2 sensor interface to a non−Lennox controller, please refer to controller manufacturer’s instructions.

• Use 18 AWG copper wire.
• Data Logging: If data logging is desired, the output terminal (4−20 mA) may be used with a field−provided data logging device

ABC LogicTM 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 4 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. The ABC Logic should be turned OFF where a building is continuously occupied 24 hours per day, or where there could be significant sources of non−occupant related CO2 such as greenhouses, breweries and other industrial and food processing applications.

Specifications

Table 1. Specifications

self calibration algorithm
Measurement Range| 0-2000 ppm (0 ppm = OV, 4mA)
Accuracy| ± 40 ppm and ± 3% of reading (@ 15­35°C; 35°C; 20-70% RH and 101.3 kPa)
Stability| < 2% of FS over life of sensor (15 yr typical)
Warm-up Time| < 1 minutes (operational) 15 minutes (max accuracy)
Operating Conditions| 0 – 50°C (32 – 122°F) 0 – 95% RH, non-condensing.
Storage Conditions| -40 – 158°F (-40 – 70°C)
Output (Analog)| 0 – 10V (resistive load greater than 5000 ohms) & 4 – 20 mA (RL max 500 ohms) available simultaneously
Power Supply
Requirements| 24 VAC +/-20%, 50/60 Hz
Temperature
Dependence| +1- 0.2% FSPC (+/- 0.1% FS/°F)
Pressure Dependence| + 1.6% reading per kPa (deviation from standard pressure 101.3 kPa)
Certifications| EMC Directive 2014/30/EC I RoHS Directive 2011/65/EU
Signal Update| Every 2 seconds.
Flammability Classification| UL94-HB
Thermistor Type| NTC 10 K ohm thermistor with 1.3 K ohm resistor in series.
Power Consumption| 3 VA for 24 VAC, 3W for 24 VDC (peak); <0.9W (average)

This product is covered by one or more of the following patents:

5,650,624 / 5,721,430 / 5,444,249 / 5,747,808 / 5,834,777 / 5,163,332 / 5,340,986 / 5,502,308 / 6,344,798 / 6,023,069 / 5,370,114 / 5,601,079 / 5,691,704 / 5,767,776 / 5,966,077 / 6,107,925 / 5,798,700 / 5,945,924 / 5,592,147 / 6,255,653 / 6,250,133 / 6,285,290

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