CD-W00-x0-2 Series Wall Mount CO
2
and Temperature Transmitters Installation Instructions
3
Note:
When you bring the cable through the wall, seal
the cable opening. If left unsealed, the hole allows air
from outside the room into the transmitter and affects
the measurement readings. For example, fresh
concrete binds CO
2
and may cause low readings,
especially in new buildings.
Connecting the Cable to the Mounting Base
Connect the wires from the cable to the screw
terminals on the mounting base. The terminal
assignments are marked next to the screw terminals.
Maximum wire size is 2 mm
2
(AWG 14).
1. Strip 1/4 in. (6.35 mm) of insulation from the ends
of the power and output signal wires.
Note:
To prevent a short circuit from occurring, make
sure that the wires are stripped to the correct length
and fully inserted into the terminal blocks. If using
shielded cable, ensure that the shield is protected from
contact with components on the top or bottom side of
the printed circuit board. Failure to follow proper wiring
procedures may cause the transmitter to fail.
2. Connect the wires to the mounting base screw
terminals as shown in Figure 4.
Note:
The transmitter is capable of generating both
voltage and current output. Each output has its own
individual positive screw terminal.
Power Supply Requirements
The transmitter requires a 24 VAC/VDC, Class 2 power
supply. Although the power input includes a halfwave
rectifier, we recommend using a DC supply to avoid
excessive current peaks.
Connections to a 24 VAC Power Supply
Connecting more than one transmitter to a single
24 VAC transformer forms a common loop and
increases the risk of a short circuit. We recommend
that you use a separate floating supply for each
transmitter (see Figure 5).
If several transmitters share a common transformer,
always connect the transmitter common (-) to the same
side of the transformer to maintain the polarity. A
shared common line at the controller may cause a
short circuit if the phase is not the same (Figure 6).
Completing the Installation
Install the cover on the mounting base:
1. Slide the bottom of the cover onto the tabs at the
bottom of the mounting base.
2. Tilt the top of the cover toward the mounting base.
Figure 3: Route the Cable From Behind (Left)
and Mount the Wall Plate (Right)
NO
CABLES
UP
Figure 4: Screw Terminals
+
-
+CO2
4...20mA
+CO2
0...10 V
-CO2
VS
~
t+
Signal Out 4 to 20 mA (+)
Signal Out 0 to 10 V (+)
Signal Common (-)
Power Supply Common (-)
Power Supply 24 VAC/DC (+)
Temperature Sensor
Temperature Sensor Common
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Figure 5: Connecting Separate AC Supplies
(Recommended)
Supply
voltage
24 VAC
24V
mA or V
Common
Signal
output
CONTROLLER
CO2 Transmitter/
Module
CO2 Transmitter/
Module
24V
mA or V
Common
Supply
voltage
24 VAC
Signal
output
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ac
Figure 6: Connecting One AC Supply to Several
Transmitters (Not Recommended)
Supply
voltage
24 VAC
24V
mA or VA
Common
Signal
output
CONTROLLER
CO2 Transmitter/
Module
CO2 Transmitter/
Module
24V
mA or VA
Common
Supply
voltage
Signal
output
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v
SHARED
COMMON
LINE
