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MOUNTING
1. Push tab on top and bottom of cover and lift cover from back plate (see Figure 1).
2. Select the mounting location, away from diffusers, lights or any external
inuences.
3. Mount transmitter on a vertical surface to a standard electrical box using the two
#6 M2C type screws provided.
4. Pull wires through sub base hole and make necessary connections.
5. Reattach cover to base plate.
WIRING
Use maximum 18 AWG wire for wiring to terminals. Refer to Figure 4 for wiring
information.
DIP SWITCH SETTINGS
To access the DIP SWITCH, remove the cover of the unit as shown in Figure 2. The
DIP SWITCH is located on the back of the circuit board.
DIP Switch Position 1: CO
2 Output Selection
ON: Output set to voltage output
OFF: Output set to current output
DIP Switch Position 2: Temperature (CDT models)/Humidity (CDTR models)
Output Selection
ON: Output set to voltage output
OFF: Output set to current output
DIP Switch Positions 3 & 4: Current or Voltage Output Range Selection
Dip Switch Position 5: Menu Access
ON: Menu Enabled
OFF: Menu Disabled
Current/Voltage Outputs
On the Series CDT, the transmitter may be wired for current or voltage output for both
carbon dioxide and temperature. On the Series CDTR, the transmitter may be wired
for current or voltage output for both carbon dioxide and humidity. The transmitter can
be powered with either 16-35 VDC or 19-28 VAC. Wire the transmitter according to
Figure 4.
Remote Display
For models that are ordered without an integral LCD display, remote display Model
A-449 can be used to display the temperature, humidity, 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 congured by the user to show humidity and
carbon dioxide, only temperature, only humidity, or only carbon dioxide.
EDITING MENU PARAMETERS
Before any adjustment can be made to the transmitter, the Menu Lockout Dip Switch
must be set to the ˝On˝ position (See Figure 3).
ACCESSING MENU PARAMETERS
Step 1: To enter the menu structure, press Up button and Down button
simultaneously for 5 seconds (display will show MAX parameter).
Step 2: Press Up button or Down button to cycle between menu items.
Step 3: Press Enter to edit the value for the displayed menu item (SET will appear
on display).
Step 4: Press Up button or Down button to adjust the value of the menu item.
Step 5: Press Enter button 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 Up button and Down button
simultaneously for 5 seconds or wait 10 seconds without pushing any
buttons.
PASSIVE
TEMPERATURE
SENSOR
12 3
4
5
6
7
8
RELAY
CONTACT
PWR
COM
OUT1
OUT2
RLY
RLY
SEN SEN
POWER
SUPPLY
TEMP OR RH
RECEIVER
CO2
RECEIVER
-
-
++
Figure 1: Removal of cover from back plate
Figure 4: Active output wiring diagram
Figure 3
UP = “ON”
DOWN = “OFF”
DIP SWITCH #1
DIP SWITCH
DIP SWITCH #6
Figure 2: Diagram of circuit board
Figure 5: Side view of transmitter
Dip switch
Output Range DIP Switch 3 Position DIP Switch 4 Position
2-10 V
4-20 mA
ON OFF
0-10 V
0-20 mA
OFF OFF
0-5 V
0-10 mA
OFF ON
1-5 V
2-10 mA
ON ON
Optional relay can be used as either a dry contact or low voltage
switched circuit up to 2 A at 30 VDC
NOTICE
DOWN
ENTER
UP
REMOTE DISPLAY PORT
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