Answer :

Final answer:

The maximum reading on a typical R410a compound gauge is 700 psig. The reading reflects gauge pressure, i.e., atmospheric pressure. If the gauge reads 700 psig, the absolute pressure (gauge pressure + atmospheric pressure) would be about 714.7 psi.

Explanation:

The maximum reading on a typical R410a compound gauge is option C) 700 psig. A compound gauge is a vital instrument used in HVAC systems that measures both high and low pressures. For the refrigerant R410a, the gauge typically features a high-pressure side that ranges up to 700 psig. This is a gauge pressure reading, meaning it's relative to atmospheric pressure, which is different from absolute pressure (the sum of gauge pressure and atmospheric pressure).

To provide some context, gauge pressure is the pressure read directly from the gauge, such as the 3000 psi in a scuba tank. Absolute pressure, on the other hand, considers the atmospheric pressure as well, which at sea level is approximately 760 mm Hg or around 14.7 psi. For instance, if a gauge reads 700 psig, the absolute pressure would be roughly 714.7 psi (700 + 14.7).

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