Dwyer CDX - Manual (Page 2)

©Copyright 2013 Dwyer Instruments, Inc. Printed in U.S.A. 11/13 FR# R6-444152-00 Rev. 1
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]
WIRING CONFIGURATIONS
Figure 1: Current Wiring for 3-Wire System – AC Power
Figure 2: Voltage Wiring for 3-Wire System – AC Power
Figure 3: Current Wiring for 4-Wire System – AC Power
Figure 4: Voltage Wiring for 4-Wire System – AC Power
The Series CDX has two terminal pins that are connected inside the sensor
to a common/ground: pin #7 on the I/O terminal blocks and pin #2 on the
power block. Do NOT connect positive 24 VAC power line to pin #2 of the
terminal block.
POWER SUPPLY REQUIREMENTS
The sensor can be powered with either 18 to 30 VAC or 18 to 42 VDC,
while the DC power is polarity protected. AC power must be at a frequency
between 50 to 60 Hz.
CALIBRATION
The Series CDX 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 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.
ACCESSORY ENCLOSURES
When mounting these products inside the ductwork, seal the hole around
the wires and leave the duct insulation in place to prevent condensation
which may damage the sensor.
Model 1508 Duct Mount Enclosure
The CDX units can be installed inside a Model 1508 Duct Mount Enclosure.
Model 1552 Outside Air Measurement Enclosure
This NEMA-3R weatherproof enclosure includes thermostat and allows
installation of the sensor in environments with temperatures down to -40°F
(-40°C).
Duct Mount Enclosure (left), Outside Air Enclosure (right)
MAINTENANCE/REPAIR
Upon final installation of the Series CDX, no routine maintenance is
required. The Series CDX 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 Sale” 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.
Before performing service or maintenance operations on the
systems, turn OFF main power switches to the unit. Electric
shock can cause personal injury. Please read and follow the wiring instructions
precisely because improper wiring my cause permanent damage to the product.
WARNING
The Series CDX is either a 3-wire or 4-wire type configuration,
powered by either AC or DC voltage. It is not a 2-wire or loop
device. Wiring the units as 2-wire or loop-powered devices will irreparably damage
the sensors and void the warranty.
CAUTION
Recommended length of wire after being
stripped of insulation for terminal pin (left).