Question 1 of 12

What ozone-depleting substance/s are banned from new units?

• Both CFC and HCFC.
• Only HCFC.
• Only CFC.

Question 2 of 12

To what extent should refrigerant bottles be filled?

• If stored above 50°C, never more than 80% filled with gas.
• They should be filled all the way up.
• If stored at or below 50°C; to 80%.
• Always to 60%.

Question 3 of 12

Where do refrigerant gases accumulate?

• They rise to the top of the room.
• On the ground.
• They stay where they are released.

Question 4 of 12

What is true about the dryer?

• It reduces odour.
• It keeps moisture out of the system.
• It is quite hard to replace.

Question 5 of 12

Why should you shut off the compressor when checking the low-pressure side?

• It increases the pressure on the low-pressure side.
• Not shutting it off causes a fire hazard.
• It doesn’t have to be on when checking for leaks on a low-pressure side.

Question 6 of 12

What is true for the recovery bottle?

• You can use any cylinder available.
• You should never fill a bottle to more than 75%.
• You don’t have to label the bottle.

Question 7 of 12

What should you do if HTC bottles are heated and affected by fire?

• Don’t do anything.
• Cool the cylinders with large amounts of water from a safe distance
• Remove them from the fire area immediately.
• Leave the area as quickly as possible.

Question 8 of 12

How do you prevent the isolated refrigerant from leaking out of the system when pumping down?

• By closing the pressure valve on the low-pressure side.
• By closing the pressure valve on the high-pressure side completely.
• By turning each side’s valve spindles clock-wise until you see a pressure reading on the gauge.

Question 9 of 12

Do you need a Certificate of Competence to open up a refrigeration unit?

• Yes, in EU and the US.
• Yes, in Asia.
• No, you never need a Certificate of Competence when dealing with any refrigeration unit.
• Yes, in EU but not in the US.

Question 10 of 12

Why is it important to clean the sight glass when you change oils?

• You can see the condition of the oil through the clean sight glass.
• The sight glass breaks easily, and the breakage/leak can be found easier if the glass is clean.
• It increases the life-span of the glass.

Question 11 of 12

Can you vent newer HFC refrigerants in the atmosphere?

• Yes, of course.
• Yes, but only in specific amounts.
• No, it’s illegal since it contributes to global warming.
• No, they are ozone-depleting.

Question 12 of 12

Why is it important to shut off current to the oil heater?

• To reduce noise.
• To avoid electrical shock.
• To prevent overheating.