When adding oil to compressor crankcase of a...

Question 1 / 270705eccef9dbacbc34ba4d460bd

Question 1 of 270705eccef9dbacbc34ba4d460bd

When adding oil to compressor crankcase of a refrigeration system with a hand pump, what precaution must be taken?

Question 1 of 27070

When adding oil to compressor crankcase of a refrigeration system with a hand pump, what precaution must be taken?

🔍 Key Concepts

• Oil charging procedure for refrigeration compressors • Risk of introducing air or noncondensable gas into a refrigeration system • Effects of system pressure when adding oil with a hand pump

💭 Think About

• Which answer choice deals with what is going directly into the closed refrigeration system along with the oil? • What problems can air or noncondensable gases cause in a refrigeration system’s operation and pressures? • When using a hand pump, what step makes sure you are not adding anything except clean oil/refrigerant to the system?

✅ Before You Answer

• Identify which choice focuses on preventing contamination (air/noncondensables) rather than just pressure or isolation • Consider which step is typically done immediately before connecting to the crankcase for oil charging • Verify which option aligns with standard safe oil‑charging practice in marine refrigeration manuals

Question 1 of 27070

When adding oil to compressor crankcase of a refrigeration system with a hand pump, what precaution must be taken?

the compressor crankcase pressure must not be too high

all air must purged from the pump and charging hose using clean oil or refrigerant vapor

the high pressure cutout switch must be held open to prevent accidental starting

the condenser must be completely isolated first

Question 1 / 270705eccef9dbacbc34ba4d460bd

Question 1 of 270705eccef9dbacbc34ba4d460bd

When adding oil to compressor crankcase of a refrigeration system with a hand pump, what precaution must be taken?

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Question 1 of 27070

When adding oil to compressor crankcase of a refrigeration system with a hand pump, what precaution must be taken?