INSTALLATION
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.
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 influences.
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: VOC 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
The transmitter may be wired for current or voltage output for both carbon dioxide and
VOC. The transmitter can be powered with either 16 or 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 VOC or 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 VOC or carbon dioxide
measurements.
PASSIVE
TEMPERATURE
SENSOR
RELAY
CONTACT
POWER
SUPPLY
VOC
RECEIVER
CO2
RECEIVER
Figure 4: Active Output Wiring Diagram
Disconnect power supply before installation to prevent electrical
shock and equipment damage.
WARNING
Upon powering the transmitter, the firmware version will flash on
the display. A warm up period of 30 minutes is required for the
transmitter to adjust to the current CO
2
concentration.
NOTICE
Self calibration feature of the transmitter requires exposure to
normal outdoor equivalent carbon dioxide level once every thirty
days.
NOTICE
Optional relay can be used as either a dry contact or low voltage
switched circuit up to 2 A at 30 VDC.
NOTICE
Use electrostatic discharge precautions (e.g., use of wrist straps)
during installation and wiring to prevent equipment damage.
CAUTION
Avoid locations where severe shock or vibration, excessive
moisture or corrosive fumes are present.
CAUTION
Do not exceed ratings of this device. Permanent damage not
covered by warranty may result.
CAUTION
Figure 1: Removal Of Cover From Back Plate
Figure 3: DIP Switch Settings
Figure 2: Diagram Of Circuit Board
Output Range DIP Switch 3 Position DIP Switch 4 Position
2 to 10 V
4 to 20 mA
ON
OFF
0 to 10 V
0 to 20 mA
OFF
OFF
0 to 5 V
0 to 10 mA
OFF
ON
1 to 5 V
2 to 10 mA
ON
ON
UP = “ON”
DOWN = “OFF”
DIP SWITCH #1
DIP SWITCH
DIP SWITCH #6
LEED
®
is a registered trademark of the U.S. Green Building Council.
