Installation and Operating Instructions
CO
2
Room Sensor in the BAPI-Stat 3 Enclosure
with Common Ground Configuration
Specifications subject to change without notice.
26141_ins_room_CO2
3 of 6
rev. 04/27/18
Terminal Function
OVR
............. Override Output (Dry Contact Switch). When
Override switch is pushed this terminal is connected
to the GND terminal.
SET
.............. Setpoint output. Referenced to GND terminal.
EXT
.............. External occupied LCD indicator is activated by logic
LOW or ground at this terminal, referenced to the
GND terminal.
TP+ & TP-
... Temperature Sensor Output (Resistive Output).
When a jumper is on J16, TP- is connected to the
GND terminal. When the jumper is off of J16, the
temperature sensor is floating.
(Semiconductor TP+ = +, TP- = -)
CO
2
/ VOC
.... Voltage output CO2 Signal (0 to 2,000 ppm)
referenced to the GND terminal.
RH
............... Voltage output Humidity Signal referenced to the
GND terminal.
GND
............. To controller Ground [GND or Common]
PWR
............ Power, referenced to GND
9 to 35 VDC @ 240mA
(9 to 24 VDC recommended) for 0 to 5 VDC Outputs
15 to 35 VDC @ 240mA
(15 to 24 VDC recommended) for 0 to 10 VDC Outputs
Termination
Note: Unit is not ready for
operation until the 10 minute
start-up time has elapsed.
Fig. 3:
Circuit Board
Note: For proper operation, the
jumper on PRG connector of J19
must be connected by only one leg.
BAPI recommends using twisted pair of at least 22AWG and sealant filled connectors for all wire connections. Larger
gauge wire may be required for long runs. All wiring must comply with the National Electric Code (NEC) and local codes.
Do NOT run this device’s wiring in the same conduit as AC power wiring. BAPI’s tests show fluctuating and inaccurate
signals are possible when AC power wiring is in the same conduit as the signal lines. If you are experiencing any of these
difficulties, please contact your BAPI representative
.
BAPI recommends wiring the product with power disconnected. Proper supply voltage, polarity and wiring
connections are important to a successful installation. Not observing these recommendations may damage the
product and void the warranty.
VC350A or VC350A-EZ
Voltage Converter
(VC350A shown below)
CO
2
Sensor
POWERING WITH A BAPI VC350A
VOLTAGE CONVERTER
The CO
2
unit requires 240mA of current
to operate correctly. If this is more
current than can be provided by the
controller power output, then the unit
can be powered by a BAPI VC350A or
VC350A-EZ Voltage Converter.
Fig. 4:
Powering with
a BAPI VC350A
