Dwyer CDW2 - Manual

The Series CDW2 Wall Mount Carbon Dioxide Transmitters monitor ambient
carbon dioxide conditions for variable air volume (VAV) on demand ventilation
systems. Universal current/voltage temperature and humidity outputs are also
available to reduce the number of instruments mounted on the wall. The Non-
Dispersive Infrared (NDIR) sensor continuously updates the calibration through a
proprietary logic feature which limits the amount of error due to drift. A duct mount
and a heated outside air enclosure are available enabling the CDW2 to be used in
different environments.
MOUNTING
Push the tabs on the case to separate the case into its front and rear sections.
Mount the rear section of the case to the wall or junction box with the supplied
screws. Mount controller on the base by aligning the top clips and securing the
bottom clips. Secure the CDW2 with the supplied set screw.
POWER SUPPLY REQUIREMENTS
The transmitter can be powered with either 18 to 42 VDC or 18 to 30 VAC. DC
power is polarity protected. AC power must be at a frequency between 50 and 60
Hz.
Selection of Current and Voltage Outputs
Prior to wiring, verify that the current/voltage selections jumpers are set to the
desired output type. For voltage output selection, the output can be 0 to 5 or 0 to
10 VDC.
Series CDW2 Wall Mount Carbon Dioxide Transmitter
Bulletin AQ-CDW2
DWYER INSTRUMENTS, INC.
Phone: 219/879-8000 www.dwyer-inst.com
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. Fax: 219/872-9057 e-mail: [email protected]
SPECIFICATIONS
Range: CO
2
: 0 to 2000 PPM;
Relative Humidity: 0 to 99%;
Active Temperature: 32 to 122°F (0 to 50°C).
Accuracy: CO
2
: ±30 PPM or 3% of reading, whichever is greater;
RH: ± 2.5% (20 to 80% RH) / 3.5% (<20% and >80%);
Active Temperature: ± 1.5°F @ 72°F (0.8°C @ 22°C);
Thermistor: ± 1.9°F @ 60 to 95°F (1°C @ 15 to 35°C).
Temperature Dependence: ±0.11% FS per °F (0.2% per °C).
Pressure Dependence: 0.135% of reading per mm Hg.
Response Time: Signal updates every 5 seconds.
Warm Up Time: < 2 min (operational), 10 min (max. accuracy).
Temperature Limits:
Ambient: 32 to 122°F (0 to 50°C);
Storage: -40 to 158°F (-40 to 70°C).
Power Requirements: 18 to 30 VAC RMS 50/60 Hz, 18 to 42 VDC, polarity
protected.
Sensor: CO
2
: Non-dispersive infrared sensor (NDIR) with ABC logic
RH: Capacitive polymer sensor
Temperature: 10 kΩ Type II thermistor, 10 kΩ type III Thermistor, 3 kΩ
Thermistor, 20 kΩ Thermistor, PT100RTD, PT1000 RTD.
Weight: 7.2 oz (204 g).
Agency Approvals: CE, RoHS.
Installation and Operating Instructions
4-37/64
[116.40]
1-1/16
[27.11]
3-13/64
[81.40]
2-23/64
[60.06]
BACK COVER
COVER LOCKING HOLE
1-1/16
[27.11]
3-13/64
[81.40]
2-23/64
[60.06]
BACK COVER
COVER LOCKING HOLE
3-13/32
[86.41]
3-1/4
[82.55]
1-3/16
[30.10]
1-3/16
[30.10]
FOR MODELS WITH LCD DISPLAY FOR MODELS WITH LCD DISPLAY
Before performing service or maintenance on the systems, turn
OFF the main power switches to the unit. Electric shock can
cause personal injury. Please read and follow the wiring instructions precisely;
incorrect wiring may cause permanent damage to the product.
The Series CDW2 contains a passive thermistor which is
electrically isolated from the other circuitry and should be wired
independently from the active inputs(Temperature, RH, CO
2
). The active inputs all
share a common ground.
NOTICE
WARNING
The Series CDW2 are 3-wire or 4-wire type configurations only.
Wiring the CDW2 as a 2-wire device will irreparably damage the
sensors and void the warranty.
CAUTION
The Series CDW2 products have two terminal pins that are
connected inside the sensor to a common/ground pin: pins 2
and 7 on the I/O terminal block and pin 2 on the power block. Do NOT connect
positive 24 VAC power line to pin 2 of the power block.
WARNING
Figure 1: Jumper settings for CO
2
output on non-display units (J3)
Figure 2: Jumper settings for display units. CO
2
is set for a 4 to 20 mA and
to 10V output , humidity is set for a 4 to 20 mA output, temperature is set to
0 to 5V output. (NOTE: Jumper names)
Shown with Optional LCD Display
Standard Style European Style