HVAC 403A Practice Exam

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In an orifice-tube system, which list correctly identifies high-pressure side components?

1/2 compressor; evaporator; 1/2 orifice tube

1/2 compressor; evaporator; condenser

1/2 compressor; condenser; 1/2 orifice tube

The main idea is to identify where the refrigerant is at high pressure in an orifice-tube system. After compression, the refrigerant is hot and high-pressure as it moves through the condenser. The orifice tube sits between the high-pressure side and the low-pressure side, so the portion of the tube before the restriction is still high-pressure. Therefore, the high-pressure side includes the compressor discharge path, the condenser, and the upstream portion of the orifice tube. The evaporator and any accumulator are on the low-pressure side after the throttling occurs. That’s why the correct set is the compressor’s high-pressure portion, the condenser, and the upstream portion of the orifice tube.

evaporator; accumulator; 1/2 orifice tube