Lennox EL23XCV Series Manual page 69

SENSOR
NONE
OUTDOOR
AMBIENT
NONE
OUTDOOR
AMBIENT
CHECKOUT:
Sensors connect to the outdoor control through a field-replaceable harness assembly that plugs into the outdoor control.
Through the sensors, the control detects outdoor ambient, coil and liquid temperature fault conditions. As the detected
temperature changes, the resistance across the sensor changes. Check sensor operation by reading ohms across pins
shown in figure 49.
NOTE – When checking the ohms across a sensor, be aware that a sensor showing a resistance value that is not within
the range shown in figure 49, may be performing as designed. However, if a shorted or open circuit is detected, then the
sensor may be faulty and the sensor harness will need to be replaced.
OUTDOOR AMBIENT
TEMPERATURE
SENSOR
RESISTANCE VALUES
TEMP RANGE ºF
RANGE (OHMS)
(ºC)
N/A
10K Ohms Nominal
336,000 to 2,487 (see table
-40 (-40) TO
16 on page 74 for exact
140 (60)
temperature to ohm readings)
N/A
BLACK WIRES WITH
BLACK SLEEVE
FIGURE 44. Temperature Sensor Specification
FIGURE 45. Temperature Sensor Locations
Page 69
PIN# / WIRE
SLEEVE COLOR
6 AND 5
4 AND 3
(BLACK)
N/A
2 AND 1
10K OHM RESISTOR
10K OHM RESISTOR
TEMPERATURE
SENSOR HARNESS
THERMOSTAT (S40) OPENS AT
CRANKCASE HEATER
70ºF, CLOSES AT 50ºF