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OUTDOOR
AMBIENT
TEMPERATURE
SENSOR HARNESS
BLACK WIRES WITH
BLACK SLEEVE
SENSOR
RESISTANCE VALUES
RANGE (OHMS)
TEMP RANGE ºF
(ºC)
PIN# / WIRE
SLEEVE COLOR
NONE
OUTDOOR
AMBIENT
NONE
4 AND 3
(BLACK)
6 AND 5
2 AND 1
-40 (-40) TO
140 (60)
336,000 to 2,487 (see table
16 on page 74 for exact
temperature to ohm readings)
10K Ohms Nominal
N/A
10K OHM RESISTOR
10K OHM RESISTOR
N/A
N/A
FIGURE 44. Temperature Sensor Specication
CHECKOUT:
Sensors connect to the outdoor control through a eld-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 gure 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 gure 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
CRANKCASE HEATER
THERMOSTAT (S40) OPENS AT
70ºF, CLOSES AT 50ºF
FIGURE 45. Temperature Sensor Locations
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