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Académie
HVAC
NATE Commercial Refrigeration Service Specialty
Temperature Control Systems
Vérification des connaissances
Temperature Control Systems
Vérification des connaissances
Vérification des connaissances
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A pressure-type temperature control on a medium-temp walk-in cooler using R-404A is set with a cut-out of 40 psig and a cut-in of 52 psig. What is the differential, and why does it matter?
A
52 psig differential - measured from zero to cut-in
B
12 psig differential - prevents short cycling by requiring a meaningful pressure change before restarting the compressor
C
8 psig differential - calculated from the midpoint between cut-in and cut-out
D
12 psig differential - this is too wide and will cause the box temperature to fluctuate excessively
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