The low-pressure cut-out switch settings...

Question 1 / 2066636eee28f7522a1c51ed08

Question 1 of 2066636eee28f7522a1c51ed08

The low-pressure cut-out switch settings vary with the refrigerant used and the temperature application. If the low-pressure cut-out switch for a particular application is set with a cut-in pressure of 5 psig, what would be the cut-out pressure if the differential is 7.5 psig?

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🔍 Key Concepts

• Relationship between cut-in pressure, cut-out pressure, and differential in a pressure control • Understanding that a positive differential is the difference between cut-in and cut-out, not an added operating pressure • Unit awareness: psig vs inches of mercury vacuum (" Hg vac.)

💭 Think About

• How is differential defined in a pressure switch: is it cut-in minus cut-out, or cut-out minus cut-in for this type of control? • If the system restarts (cuts in) at 5 psig and the differential is 7.5 psig, in which direction must the pressure have moved while the compressor was running? • Sketch a simple number line with pressure values and mark the cut-in point, then move by the amount of the differential to find the cut-out point.

✅ Before You Answer

• Be clear on whether cut-out pressure = cut-in pressure ± differential for low-pressure controls on refrigeration systems. • Check that the resulting pressure sign (positive/negative) and units make sense for a low-pressure cut-out in this context. • Eliminate any choice that does not match the numerical difference of 7.5 psig from the given 5 psig cut-in pressure.

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Question 1 of 20

5" Hg vac.

0 psig

2.5 psig

12.5 psig

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Question 1 / 2066636eee28f7522a1c51ed08

Question 1 of 2066636eee28f7522a1c51ed08

Back

Question 1 of 20

66636eee28f7522a1c51ed08

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

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