Understanding Refrigerant Oils

What type of lubricant is most commonly used with HCFC binary and ternary blends?

• Mineral oil

• Synthetic alkylbenzene lubricant

• Polyolester oil

• Glycol-based oil

When retrofitting HCFC equipment to HFC refrigerants, which type of oil is most commonly used?

• Mineral oil

• Synthetic alkylbenzene lubricant

• Polyolester oil

• Glycol-based oil

What must be done before adding ester-based oil to an HCFC system being retrofitted to HFC refrigerant?

• Mix it with mineral oil

• Remove other types of oils from the system

• Add water to the system

• Heat the system

Why must care be taken when using ester-based oils?

• They are highly flammable

• They are very hygroscopic

• They are corrosive

• They are expensive

What does it mean for an oil to be hygroscopic?

• It can mix with other oils

• It absorbs moisture from the air

• It evaporates quickly

• It is resistant to temperature changes

Which type of oil cannot be mixed with any other type of oil?

• Mineral oil

• Synthetic alkylbenzene lubricant

• Polyolester oil

• Glycol-based oil

What is the primary concern when storing ester-based oils?

• They can freeze easily

• They can absorb moisture through some containers

• They can react with metal containers

• They can lose their viscosity

What is the composition of HCFC binary blends?

• One-part

• Two-part

• Three-part

• Four-part

What is the composition of HCFC ternary blends?

• One-part

• Two-part

• Three-part

• Four-part

Which of the following is NOT a characteristic of ester-based oils?

• They are hygroscopic

• They can be mixed with other oils

• They are used in retrofitting HCFC systems

• They require careful handling