The fluid used to act against hydraulic...

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Question 1 of 205eccef9dbacbc34ba4d46047

The fluid used to act against hydraulic relay piston to control how many cylinders are unloaded in the refrigeration compressor capacity control system illustrated, is obtained from where? See illustration GS-RA-13.

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🔍 Key Concepts

• Trace the colored pressure lines in the diagram (control oil, oil pump pressure, crankcase pressure) and see which color actually enters the hydraulic relay chamber under the piston. • Notice what the legend calls the medium-brown (or dark) line coming from the compressor oil pump and where it is routed before it reaches the unloader power elements. • Think about how a hydraulic relay works: it needs a fluid under pressure that can be throttled/controlled to send pressure to the unloaders.

💭 Think About

• Follow the line that feeds the hydraulic relay piston: where does that line originate according to the labels and legend? • Ask yourself: which of the four choices is a liquid under pressure that can be easily used for hydraulic control, as opposed to a gas? • Look at the label just upstream of the hydraulic relay: what pressure name is printed on that line, and does that match any of the answer choices?.

✅ Before You Answer

• Verify which color in the legend corresponds to control oil pressure versus oil pump pressure and crankcase pressure. • Confirm which pressure line actually goes into the hydraulic relay body and under the piston, not just near it. • Make sure you are choosing a source that is clearly a liquid oil pressure source, not a refrigerant gas source.

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