Carrier 38VMH-1P Service Manual page 25

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ELECTRONIC EXPANSION VALVE (EEV)
The opening of the EEV is based on compressor discharge temperature (T5). If T5 increases, EEV operates the opening to target value
directly. Otherwise, it regulates itself to step-by-step operation.
Fig. 29 —Cooling Operation
If the superheat is too high, the software revises T5 so that EEV can quickly adjust to a larger opening. Discharge Superheat Correction
adjusts every two minutes.
T5 (new) = T5 (old) + 18°F
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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Fig. 31 —Discharge Superheat Correction
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Fig. 30 —Heating Operation
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