The coil temperature measured at the expansion valve sensing bulb of an operating system is 10°F. The low side pressure with the compressor running as shown on the gauge illustrated indicates 15 psig. What adjustments or changes, if any, should be made to the system? Illustration GS-RA-16

Correct Answer: Option D — The expansion valve should not be adjusted, as the degree of superheat is within the accepted range.

At 15 psig, the saturation temperature for standard refrigerants corresponds to specific baseline values. Subtracting this saturation temperature from the measured 10°F coil temperature yields the operating superheat. Because this calculated superheat falls within the normal 8°F to 12°F range, no expansion valve adjustment is necessary.