Lennox PRODIGY2.0 User Manual

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4. Sensors
The M3 unit controller is only compatible with L-Connection sensors provided with the unit or purchased separately as
specified in the Product Specification.
IMPORTANT
All 0-10VDC sensors require two separate twisted pair cables with shield. One cable is used for the 24VAC power and
one cable is used for the 0-10VDC output. Room sensors require a single twisted pair cable with shield. The shield
drain wires must be connected to the common at the unit field wiring terminal block only. The shield drain wires must
not be connected to common at the sensor. Non-communicating temperature sensors require single twisted pair wire
only.
4.1. Temperature Sensors - Provided With Unit
The return air (RT16) and discharge air (RT6) duct probes and the outdoor air (RT17) are all two wire thermistors. The
resistance vs. temperature table is shown below:
Table 12. Resistance vs. Temperature
Temp. °F (°C) Resistance +/-2%
Temperature °F
(°C)
Resistance +/-2% Temp. °F (°C) Resistance +/-2%
-40 (-40) 335,671 40 (4.4) 26,106 90 (32.2) 7,332
-20 (-28.9) 164,959 50 (10) 19,904 100 (37.8) 5,826
0 (-17.8) 85,323 60 (15.6) 15,313 120 (48.9) 3,756
20 (-6.7) 46,218 70 (21.1) 11,884 130 (54.4) 3,047
30 (-1.1) 34,566 80 (26.7) 9,298
4.2. Room Sensor - Optional
Room sensor (A2) is a two-wire thermistor with 1k series resistor.
Table 13. Two-Wire Thermistor
Temp. °F (°C) Resistance +/-2%
Temperature °F
(°C)
Resistance +/-2% Temp. °F (°C) Resistance +/-2%
40 (4.4) 27,102 60 (15.6) 16,313 80 (26.7) 10,299
45 (7.2) 23,764 65 (18.3) 14,474 85 (29.4) 9,249
50 (10) 20,898 70 (21.1) 12,882 90 (32.2) 8,529
55 (12.8) 18,433 75 (23.9) 11,498
4.3. Relative Humidity Sensor - Optional
The indoor relative humidity sensor (A91) is an analog sensor with a 0-10VDC output over a relative humidity range of
0-100% relative humidity. The sensor is powered with 24VAC.
4.4. Carbon Dioxide (Indoor Air Quality) Sensor - Optional
The indoor carbon dioxide sensor (A63) is an analog sensor with a 0-10VDC output over a carbon dioxide range of 0-2000
ppm as shown in the following table. The sensor is powered with 24VAC.
Table 14. Carbon Dioxide Range
Carbon
Dioxide PPM
DC Voltage
Carbon
Dioxide PPM
DC Voltage
Carbon
Dioxide PPM
DC Voltage
Carbon
Dioxide PPM
DC Voltage
0 0 600 3 1200 6 1800 9
200 1 800 4 1400 7 2000 10
400 2 1000 5 1600 8

Lennox PRODIGY2.0 Specifications

General

Brand	Lennox
Model	PRODIGY2.0
Category	Controller
Language	English