Troubleshooting
CO2 Sensor
Description of Fault
A CATALYST CO2 Sensor Fault indicates the return air CO2 readings are out-of-limit. A CATALYST CO2 Sensor Fault Alarm is generated when the CO2 sensor readings are high (2000 ppm) or low (0 ppm).
A CATALYST CO2 Sensor Fault Alarm will automatically reset when the CO2 registers a reading with an approximate value between 400-1200 ppm.
Possible Causes
A CATALYST CO2 Sensor Fault is typically caused by:
-
Shorted or open CO2 sensor cable (during installation).
-
Damaged CO2 sensor cable caused by the return damper or loose wire nuts.
-
Failed CO2 sensor.
-
Improper voltage to the sensor.
-
Shorted input on the controller.
Troubleshooting
From eIQ Platform
-
On the eIQ Platform, navigate to the Status page of the unit.
-
Verify the CO2 reading under the Return Air temperature.
-
If the CO2 reading is 0 ppm or 2000 ppm a qualified technician to visit the site for further troubleshooting.
-
If CO2 reading is between 400-1000 ppm contact TW for support.
-
On Site
-
Access the CO2 sensor located in the return air duct.
-
Inspect the CO2 sensor wire nut connections to the YELLOW W/ PURPLE STRIPE 4-C CABLE.
-
Inspect the CO2 sensor and wire for damage.
-
Inspect the wiring of the sensor for the presence of 24V AC between the BLACK and RED wires of the yellow w/ purple stripe 4-C cable.
-
Measure DC voltage coming from CO2 sensor on the Brown wire connected to the green wire on the CATALYST Yellow with a Purple stripe.
-
Does the DC voltage measurement match the readings on the eIQ Platform? 10 volts would be 2000 ppm, 5 volts 1000 ppm.
-
If not remove the connection brown wire from the green conductor coming from the yellow with a purple strip wire from the CATALYST. Verify that the DC voltage measurement doesn’t change.
-
-
-
Contact Transformative Wave for further assistance at technical@twavetech.com or (855) 867-2333.