NuAire Ecosmart Connect ESCO-CO2D, Installation And Maintenance

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nuaire.co.uk 029 2085 8400 08. 03. 18. Document Number 671870
Installation and Maintenance
Ecosmart Connect Duct Mounted CO
2
Sensor
0
Shared
Common
Line
Supply
Voltage
24 VAC
CO2 Sensor
Supply
Voltage
Output
Signals
CO2 Sensor
Controller
~
+
~
-
~
+
~
-
V
0
mA
or
V
mA
or
m
A
V
0
—
+
X3 V7 V10
0/
4m
A
X7 X6
X5
SERIAL COM
Figure 4. Connecting One AC Supply to Several Sensors (Not
Recommended) Figure 6. Sensor PCB.
3.3 Connecting the Conduit Adaptor
• Align the nut with the opening inside the enclosure, and hold it in
place.
• Insert the adaptor body into the sensor conduit opening.
• Manually tighten the adaptor into the nut, turning in a clockwise
direction (see Figure 5).
• Insert the wires through the conduit adaptor body opening.
• Tighten the adaptor onto the adaptor body by turning the adaptor
in a clockwise direction.
IMPORTANT
Do not overtighten the conduit adaptor, doing so could cause damage
to or displacement of the PCB.
Nut
Adaptor Body
Adaptor
Figure 5. Inserting the Conduit Adaptor.
3.4 Wiring the PCB
To wire the PCB’s input and output connections:
• Open the sensor cover.
• Insert the wire carefully through the conduit adapter and then strip
6.35 mm of the wire insulation to prepare the wire for connection
to the terminal block.
• Connect the 24V supply between the positive (+) and negative (-)
terminals as shown in Figure 6.
• Connect the common wire to Terminal 0.
• Connect the other wire to Terminal V (for voltage output).
4.0 Sensor Calibration
Nuaire’s carbon dioxide (CO2) sensors come from the factory calibrated
for the following:
• Output signal (0 to 10V) proportional to CO2 concentration (0 to
2,000 parts per million [ppm]).
• Altitude range of 0 to 600m above sea level without
compensation.
• Default relay output trigger point of 1,000 ppm.
5.0 Troubleshooting
The sensor is not field repairable.
In the event the unit is not functioning properly, use the following
checklist to identify the symptoms and determine a solution.
• Verify that all wiring is correct.
• Verify that the power supply voltage level is 20 to 30 VAC or 18 to
30 VDC.
Note: The diagnostic Light-Emitting Diodes (LEDs) shown in the lower
right-hand corner of Figure 6 indicate operational status:
• V7 lights up if the self-diagnostics procedure detects an
abnormality.
• V10 pulses to indicate that the device is operational.
If the sensor will not operate after completing these steps, replace the
unit.