Dwyer CDTR - Manual (Page 2)

MOUNTING
1. Cut hole into duct large enough to insert probe.
2. Attach housing ears to duct using the two self-tapping screws provided.
3. Knock out an opening in the housing and attach an electrical fitting to route
electrical wiring. PG11 & PG16 knockouts are molded into the housing.
WIRING
Use maximum 18 AWG wire for wiring to terminals. Refer to Figure 5 for wiring
information.
Selection of Current and Voltage Outputs
Prior to wiring, verify that the current/voltage configuration switches (positions 1 and
2) are set to the desired output type. Refer to Figure 1 to locate the configuration
switches. See Figure 2 for diagram of the current/voltage selection switches. For
voltage output selection, the output can be 0 to 10 VDC, 0 to 5 VDC, 2 to 10 VDC or
1 to 5 VDC. See Figure 3 for the type of voltage output selection switches (positions
3 & 4).
Current / Voltage Outputs
The transmitter may be wired for current or voltage output for both carbon dioxide and
temperature. The transmitter can be powered with either 16 to 35 VDC or 19 to 28
VAC. Wire the transmitter according to Figure 4.
Thermistor and RTD Outputs
Thermistor and RTD passive outputs are located on terminals 7 and 8 and do not
require any power. Passive temperature outputs are not polarity sensitive.
Remote Display
Remote display Model A-449 can be used to display the relative humidity,
temperature, and carbon dioxide. The mini USB plug of the remote display plugs into
the receptor on the side of the housing. After a short warm up time, the display will
begin to show the current temperature and carbon dioxide measurements unless
configured by the user to show only temperature or only carbon dioxide.
ACCESSING MENU pARAMETERS
Step 1: To enter the menu structure, press and simultaneously for
5 seconds (display will show RON parameter).
Step 2: Press or to cycle between menu items.
Step 3: Press to edit the value for the displayed menu item (SET will appear
on display).
Step 4: Press or to adjust the value of the menu item.
Step 5: Press to save the changes (SET will disappear).
Step 6: Repeat Steps 2 through 5 for each of the parameters.
Step 7: To exit the menu at any time, press and hold and
simultaneously for 5 seconds or wait 10 seconds without pushing any buttons.
CO2 CONCENTRATION
OUTPUT SELECTION
TEMPERATURE/
RH OUTPUT SELECTION
VOLTAGE CURRENT VOLTAGE CURRENT
0-10 V
0-20 mA
2-10 V
4-20 mA
0-5 V
0-10 mA
1-5 V
2-10 mA
PASSIVE
TEMPERATURE
SENSOR
RELAY
CONTACT
POWER
SUPPLY
TEMP OR RH
RECEIVER
CO2
RECEIVER
figure 2: Current/Voltage Output
Selection Jumper (pJ1 And pJ2)
figure 3: Output Range Selection Jumper
figure 4: Active Output Wiring Diagram
figure 1: Diagram Of Circuit Board
DOWN PUSH
BUTTON
CONFIGUATION
SWITCHES
TERMINAL
BLOCK
REMOTE DISPLAY
CONNECTOR
UP PUSH BUTTON
ENTER PUSH BUTTON
Optional relay can be used as either a dry contact or low voltage
switched circuit up to 2 A at 30 VDC. NOTICE