Question 1 of 12

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

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

Question 2 of 12

Why are coolants filled in their liquid state?

• To prevent leaks.
• It’s easier to fill to the right amount.
• They contain a mixture of different refrigerants.

Question 3 of 12

Where should you check when checking for leaks?

• All alternatives apply.
• Expansion valves, safety valves and bellows in pressure gauges.
• Shaft seals and suction regulators.
• Screws, bolts, clamps, valve spindles and valve caps

Question 4 of 12

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

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

Question 5 of 12

What is true about the dryer?

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

Question 6 of 12

Why shouldn’t vacuum oil be kept in oil change tanks?

• The oil is likely to contain too much moisture.
• It’s hard to know if the oil is too old to use.
• Rust and particles from the tank can contaminate the oil.

Question 7 of 12

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

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

Question 8 of 12

What is true for the recovery bottle?

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

Question 9 of 12

How should a gas cylinder NOT be lifted?

• In an upright position.
• In the top valve.
• With both hands .

Question 10 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 11 of 12

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

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

Question 12 of 12

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

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