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Temperature Sensors
The return air (RT16) and discharge air (RT6) duct probes
The resistance vs. temperature table is shown below:
Relative Humidity Sensor - Optional
The indoor relative humidity sensor (A91) is an analog
with 24VAC.
Enthalpy Sensor - Optional
The sensor is powered with 18VAC provided by M3 unit
control.
-
1.2” water column if not an error code is stored and ser-
vice alarm output is turned on.
TABLE 1
Resistance vs. Temperature
Room Sensors
Room sensor (A2) is a two-wire thermistor with 1k series resistor.
TABLE 2
Two-Wire Thermistor
Carbon Dioxide Sensor
ppm as shown in the following table. The sensor is powered with 24VAC.
TABLE 3
Carbon Dioxide Range
Carbon Dioxide
PPM
DC Voltage Carbon Dioxide
PPM
DC Voltage Carbon Dioxide
PPM
DC Voltage Carbon Dioxide
PPM
DC Voltage
3 6 9
1 4
2 8
VAV Supply Static Sensor
TABLE 4
Carbon Dioxide Range
Pressure “w.c. DC Voltage Pressure “w.c. DC Voltage Pressure “w.c. DC Voltage Pressure “w.c. DC Voltage
3 3 6 9
1 2 4
1 2 4 8
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