Connection Terminal Function Electrical Data Remark
+24V
GND Power (+)
Ground (-) 24 vac/dc + (+/-20%), 2w
24 vac/dc
System Voltage Ref.
M
Vo
Io Signal Ground
Voltage output
Current output
0 – 10V
4 – 20mA Connected to GND
0 – 2,000ppm CO2
0 – 2,000ppm CO2
N.O.
COM
N.C. Normally opened
Common
Normally closed 24V contact, 1A rating Voltage-free contact with set point at 1,000ppm CO2
J4 Relay set point jumper 1,000 / 800 ppm