Dwyer CDD User Manual
Bulletin E-CDD
8
-1/8
[
206.25]
8˝ STYLE PROBE
5-11/16
[144.46]
4-31/32
[126.21]
3-1/16
[77.79]
2X Ø7/32
[2X Ø5.56]
4˝ STYLE PROBE
Ø1-1/4
[Ø31.7]
4-1/8
[104.78]
1
-39/64
[40.88]
4
X KNOCKOUT 1/2˝ CONDUIT HOLE
3-1/32
[77]
1-1/8
[28.58]
AIR FLOW
MODEL CDD
AIR FLOW
CO2 VENTILLATION
TRANSMITTER
RED: 24V BROWN: VCUT
BLACK: GROUND
Model CDD Duct Mount Carbon Dioxide Transmitter
Specifications - Installation and Operating Instructions
The Model CDD Duct Mount Carbon Dioxide Transmitter monitors
the occupancy in a room by detecting the concentration of carbon
dioxide in the return air duct. The non-dispersive infrared sensing
technology automatically updates the calibration of the transmitter using
a proprietary logic feature which limits the amount of error due to drift.
The Model CDD can measure up to 2000 PPM in duct air flows less than
1500 FPM.
INSTALLATION
Warning: Disconnect power supply before installation to prevent
electrical shock and equipment damage.
Make sure all connections are in accordance with the job wiring diagram
and in accordance with national and local electrical codes. Use copper
conductors only.
Caution: Use electrostatic discharge precautions (e.g. use of wrist
straps) during installation and wiring to prevent equipment damage.
Do not exceed the ratings of this device, permanent damage not
covered by warranty may result.
SPECIFICATIONS
Range: 0 to 2000 PPM.
Accuracy: ±40 PPM + 3% of reading @ 22°C.
Temperature Dependence: 0.2% FS per °C.
Stability: < 2% of FS over life of sensor.
Non-Linearity: < 1% of FS.
Pressure Dependence: 0.13% of reading per mm of Hg.
Response Time: 3 minutes typical for 90% step change.
Duct Air Velocity Range: 0 to 1500 FPM (7.63 m/s).
Ambient Operating Temperature: 32 to 122°F (0 to 50°C).
Storage Temperature: -4 to 158°F (-20 to 70°C).
Power Requirements: 18 to 30 VAC RMS 50/60 Hz or 18 to 42 VDC.
Power Consumption: 1.65 watts peak (0.65 watts average at 42
VDC).
Outputs: 0 to 10 VDC.
Housing: Flammability Classification UL rated 94V-5VA.
Weight: 8 oz (230 g).
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. Fax: 219/872-9057 e-mail: info@dwyer-inst.com
Phone: 219/879-8000 www.dwyer-inst.com
Mounting
A
I
R
F
LO
W
A
I
R
F
L
O
W
A
I
R
F
L
O
W
D
rill / Punch
1
/8˝ Holes
Duct
Conduit
G
asket
(
Supplied)
D
rill / Cut
1
-1/4˝ Hole
µController
Power
Supply
Red Wire
Brown Wire
Analog Out
(0 to 10 VDC)
(0 to 2000 PPM)
Common
Black Wire
Sensor Optics
Input Power
18 VDC to 42 VDC or
18 VAC to 30 VAC
RMS
50/60 Hz
CALIBRATION
The Series CDD is factory set with the proprietary logic function activated. The logic function allows the sensor to continuously re-calibrate itself
when the indoor concentrations drop to levels similar to outside air conditions when the building is 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 a building is occupied 24 hours a day or there is significant sources of CO2while the building is unoccupied, the transmitter
should be ordered with the logic function deactivated.
MAINTENANCE
Upon final installation of the Series CDD Duct Mount Carbon Dioxide
Transmitter, no routine maintenance is required. A periodic check of
system calibration is recommended. The Series CDD is not field
serviceable and should be returned if repair is needed (field repair
should not be attempted and may void warranty). Be sure to include a
brief description of the problem plus any relevant application notes.
Contact customer service to receive a return goods authorization
number before shipping.
Figure A
1. Before installing sensor, note the direction of the airflow.
Ensure all mounting holes are sealed tightly.
2. Drill/Cut one 1-1/2˝ hole / Punch/Drill one 1/8˝ hole.
3. Slide sensor into 1-1/2˝ hole and secure with screws.
Wiring Information
Refer to Figure B for wiring information.
Red - Input Power
Brown - Vout
Black - Ground
©Copyright 2012 Dwyer Instruments, Inc. Printed in U.S.A. 6/12 FR# R6-443629-00 Rev. 3
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. Fax: 219/872-9057 e-mail: info@dwyer-inst.com
Figure B
Phone: 219/879-8000 www.dwyer-inst.com
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