AZ ROC C-39 Air Conditioning And Refrigeration Practice Questions - Arizona ROC C-39 CR-39 R-39R Air Conditioning And Refrigeration Examination Exam

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An HVAC technician is troubleshooting an R-410A commercial split system. The liquid line gauge pressure reads 318 psig (corresponding to a saturated condensing temperature of 100°F), and the measured liquid line temperature at the outlet of the condenser coil is 88°F. What is the system subcooling, and what does this indicate if the manufacturer design subcooling is 12°F?

Subcooling is 6°F; the system is undercharged or has a metering valve over-feeding. Subcooling is 12°F; the system subcooling matches manufacturer specification exactly. Subcooling is 18°F; the system has a non-condensable gas or severe restriction. Subcooling is 24°F; the condenser coil is severely fouled or overcharged.

Correct Answer:

Subcooling is 12°F; the system subcooling matches manufacturer specification exactly.

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