6
CD-Wxx-00-0 Series Wall Mount CO
2
Transmitter Installation Instructions
CF
0 200 400 600 800 1,000 1,200 1,400 1,600 1,800 2,000 2,200
Altitude (Meters)
0.90
0.95
1.00
1.05
1.10
1.15
1.20
1.25
1.30
Figure 12: Altitude Compensation in Meters above Sea Level
Troubleshooting
The transmitter is not field-repairable.
If the unit is not functioning properly, use the following
checklist to identify the symptoms and determine a
solution:
1. Verify that the unit is mounted properly and the
appropriate output jumper is selected.
2. Verify that all wiring is correct.
3. Verify that the power supply voltage level is
20 to 30 VAC or 18 to 30 VDC.
Note:
The diagnostic Light-Emitting Diode (LED)
shown at the right-hand corner of Figure 7
indicates operational status:
•
V7 lights up if the self-diagnostics procedure
detects an abnormality.
•
V10 pulses to indicate that the device is
operational.
If the transmitter will not operate after completing
these steps, replace the unit.
Testing the Relay Module
To confirm that the relay is operating correctly, perform
the following procedure:
1. Temporarily turn off power to the unit.
2. Temporarily remove wires connected to the relay
screw terminal.
3. Connect a multimeter to the relay terminals.
4. Read the resistance level to determine whether
the contacts are open or closed.
•
If the contacts are closed, replace the unit with
the appropriate relay module and restart this
procedure.
•
If the contacts are open, apply power to the
transmitter.
5. Determine whether the contacts are open or
closed.
•
If the contacts are closed, the relay is
functioning properly and no further testing is
necessary.
•
If the contacts are open, increase the CO
2
concentration by exhaling near the sensor
looking for a change in the resistance value.
(See Figure 3.)
•
If no change is noted, confirm that the CO
2
concentration has been raised above the trip
point.
- Check the transmitter output signal with a
voltmeter to make sure the signal has risen
above the 1000 ppm relay trip point.
- If the output signal has not reached the trip
point, it may be necessary to further
increase the CO
2
concentration.
•
If the contacts are open after exceeding the
trip point, replace the unit with the appropriate
module and restart this procedure.
6. Disconnect power to the transmitter.
7. Disconnect the multimeter from the relay
terminals.
