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The T3b evaporator outlet sensor provides the control with
evaporator outlet temperature during sealed system operation.
The control checks the sensor to confirm:
1. Temp difference between T3a and T3b is greater than 5°F
after 30 minutes compressor run time.
2. The T3a, T3b and T5 sensors are all within 15°F of each other
before the compressor starts.
The sensor is considered open if the voltage at the board is
greater than 4.88VDC and shorted if less than .098VDC.
If any of the above tests fail, the control will stop the sealed
system and operate the water heater in electric mode.
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