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Relative Humidity Sensor - Optional
The indoor relative humidity sensor (A91) is an analog
sensor with a 0-10VDC output over a relative humidity
with 24VAC.
Enthalpy Sensor - Optional
the economizer have an output of 4-20mA. The sensor is
Pressure Transducer (PT5) present in the economizer.
-
sponding to 0” water column and 2” water column respec-
tively. For all practical purposes the output should be less
than 1.2” water column if not an error code is stored and
service alarm output is turned on.
Temperature Sensors
and the outdoor air (RT17) are all two wire thermistors.
TABLE 1
Resistance vs. Temperature
Temp. °F (°C) Temperature °F (°C) Temp. °F (°C)
-40 (-40) 40 (4.4) 90 (32.2)
50 (10)
70 (21.1) 130 (54.4)
30 (-1.1)
Room Sensors
Room sensor (A2) is a two-wire thermistor with 1k series resistor.
TABLE 2
Two-Wire Thermistor
Temp. °F (°C) Temperature °F (°C) Temp. °F (°C)
40 (4.4)
45 (7.2)
50 (10) 70 (21.1) 90 (32.2)
75 (23.9)
Carbon Dioxide Sensor
ppm as shown in the following table. The sensor is powered with 24VAC.
TABLE 3
Carbon Dioxide Range
PPM
DC Voltage
PPM
DC Voltage
PPM
DC Voltage
PPM
DC Voltage
0 0 3 1200 9
200 1 4 1400 7 2000 10
400 2 1000 5
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