Dwyer CDW2 User Manual
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F
OR MODELS
W
ITH LCD DISPLAY
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OR MODELS
W
ITH LCD DISPLAY
Series CDW2 Wall Mount Carbon Dioxide Transmitter
Installation and Operating Instructions
hown with Optional LCD Display
S
The Series CDW2 Wall Mount Carbon Dioxide Transmitters monitor ambient
carbon dioxide conditions for variable air volume (VAV) on demand ventilation
ystems. Universal current/voltage temperature and humidity outputs are also
s
vailable to reduce the number of instruments mounted on the wall. The Non-
a
ispersive Infrared (NDIR) sensor continuously updates the calibration through a
D
roprietary logic feature which limits the amount of error due to drift. A duct mount
p
nd a heated outside air enclosure are available enabling the CDW2 to be used in
a
ifferent environments.
d
WARNING
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.
WARNING
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.
CAUTION
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.
NOTICE
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
share a common ground.
). The active inputs all
2
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.
Standard Style European Style
PECIFICATIONS
S
ange: CO
R
R
0 to 2000 PPM;
:
2
elative Humidity: 0 to 99%;
Active Temperature: 32 to 122°F (0 to 50°C).
Accuracy: CO
RH: ± 2.5% (20 to 80% RH) / 3.5% (<20% and >80%);
: ±30 PPM or 3% of reading, whichever is greater;
2
Active Temperature: ± 1.5°F @ 72°F (0.8°C @ 22°C);
hermistor: ± 1.9°F @ 60 to 95°F (1°C @ 15 to 35°C).
T
emperature Dependence: ±0.11% FS per °F (0.2% per °C).
T
ressure Dependence: 0.135% of reading per mm Hg.
P
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
RH: Capacitive polymer sensor
: Non-dispersive infrared sensor (NDIR) with ABC logic
2
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.
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.
Figure 1: Jumper settings for CO2output on non-display units (J3)
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.
Figure 2: Jumper settings for display units. CO2is 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)
Phone: 219/879-8000 www.dwyer-inst.com
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. Fax: 219/872-9057 e-mail: info@dwyer-inst.com
IRING
W
he CDW2 series has two basic configurations. The first provides three active outputs
T
relative humidity, temperature, CO
(
onfiguration provides only the CO
c
power requirements and wiring for the two configurations are identical. The
recommended wire gauge is 18 to 22 AWG (1.0 to 0.75 metric).
CCESSORIES
A
odel 1508 Duct Mount Enclosure – The CDW2 series can be installed in a model
M
508 duct mount enclosure.
1
odel 1552 Outside Air Enclosure – This NEMA-3R weatherproof enclosure
M
includes thermostat and allows installation of the sensor in environments with
temperatures down to -40°F (-40°C).
Figure 8: Duct mount enclosure (left), outside air enclosure (right)
Calibration
he Series CDW2 is factory set with the proprietary logic function activated. The logic
T
unction allows the sensor to continuously recalibrate itself when the indoor
f
oncentrations drop to levels similar to outside air conditions when the building is
c
unoccupied. The building must be unoccupied for a minimum of 4 hours or more for
this self calibration to be effective. The logic allows the sensor to maintain its
calibration over the life of the sensor. If the building is occupied 24 hours a day or
there is significant sources of CO
should be turned off.
and an independent thermistor. The other
)
2
utputs and an independent thermistor. The
o
2
while the building is unoccupied, the logic function
2
igure 4: 3-wire configuration for use with models CDW2-2W4XX
F
igure 5: 4-wire configuration for use with models CDW2-2W4XX
F
MAINTENANCE/REPAIR
Upon final installation of the Series CDW2, no routine maintenance is required. The
Series CDW2 is not field serviceable and should be returned if repair is needed. Field
repair should not be attempted and may void warranty.
WARRANTY/RETURN
Refer to “Terms and Conditions of Sales” in our catalog and on our website. Contact
customer service to receive a Return Goods Authorization number before shipping the
product back for repair. Be sure to include a brief description of the problem plus any
additional application notes.
WIRING DIAGRAMS
Figure 3: Power block terminal connection. For use on all models.
(See Power Supply Requirements)
Figure 6: 3-wire configuration for use with models CDW2-2W4XX-LCD
Figure 7: 4-wire configuration for use with models CDW2-2W4XX-LCD
©Copyright 2013 Dwyer Instruments, Inc. Printed in U.S.A. 3/13 FR# R6-444001-00 Rev. 2
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: info@dwyer-inst.com
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