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If the minimum winter design temperature in your town is 0°F, what would the low-pressure cut-in and cut-out be for a walk-in freezer using R-404a in an outdoor condensing unit?

A. Cut-in: -10 psig, Cut-out: 10 psig
B. Cut-in: 20 psig, Cut-out: 30 psig
C. Cut-in: 30 psig, Cut-out: 40 psig
D. Cut-in: 40 psig, Cut-out: 50 psig

Answer :

Final answer:

The low-pressure cut-in and cut-out for a walk-in freezer using R-404a in an outdoor condensing unit with a minimum winter design temperature of 0°F would be Cut-in: -10 psig, Cut-out: 30 psig.

Explanation:

In a walk-in freezer using R-404a in an outdoor condensing unit, the low-pressure cut-in and cut-out depend on the minimum winter design temperature in the town. The low-pressure cut-in is the pressure at which the compressor of the freezer starts, and the cut-out is the pressure at which it stops. For R-404a, a common refrigerant, the typical low-pressure cut-in and cut-out range is around -10 to 30 psig. Therefore, given a minimum winter design temperature of 0°F, the appropriate low-pressure cut-in and cut-out for this walk-in freezer would be:



  • Cut-in: -10 psig
  • Cut-out: 30 psig

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