Assessment: Reefer Unit Maintenance

Legislation and Environment

Legislation and Environment

In this lesson, you’ll learn about how refrigerants should be handled so you to abide by the law and take care of the environment.

0%
Introduction to Reefer Unit Maintenance 2 minutes
Greenhouse Gases and the Environment 6 minutes

Health and Safety

Health and Safety

In this lesson, you’ll know how to store and safely handle cylinders, how to prevent incidents from happening, and what to expect and do if they should occur.

0%
Handling Refrigerants 13 minutes

Detecting Leaks, Pump-down and Recovery

Detecting Leaks, Pump-down and Recovery

In this lesson, you will learn how to check for leaks and detect them, perform a pump-down and recover the refrigerant that is still left in the system.

0%
Detecting Leaks 1 minute
Pump-Down 1 minute
Evacuating the System 2 minutes

Dryer and Oil Change

Dryer and Oil Change

In three steps, this lesson focuses on how to change cooler oil, and you will learn how to drain the oil and see the importance of the dryer and sight glass.

0%
Draining the Oil 2 minutes
The Importance of the Dryer 1 minute
Sight Glasses 1 minute

After Service and Repairs

After Service and Repairs

In this lesson, you will learn how to finish the reefer maintenance, by vacuum pumping the system for moisture, topping up the oil and adding new refrigerant.

0%
Vacuuming 1 minute
Adding Oil 1 minute
Adding Refrigerant 1 minute
Assessment: Reefer Unit Maintenance 5 minutes

Lessons

Legislation and Environment

Legislation and Environment

In this lesson, you’ll learn about how refrigerants should be handled so you to abide by the law and take care of the environment.

0%
Introduction to Reefer Unit Maintenance 2 minutes
Greenhouse Gases and the Environment 6 minutes

Health and Safety

Health and Safety

In this lesson, you’ll know how to store and safely handle cylinders, how to prevent incidents from happening, and what to expect and do if they should occur.

0%
Handling Refrigerants 13 minutes

Detecting Leaks, Pump-down and Recovery

Detecting Leaks, Pump-down and Recovery

In this lesson, you will learn how to check for leaks and detect them, perform a pump-down and recover the refrigerant that is still left in the system.

0%
Detecting Leaks 1 minute
Pump-Down 1 minute
Evacuating the System 2 minutes

Dryer and Oil Change

Dryer and Oil Change

In three steps, this lesson focuses on how to change cooler oil, and you will learn how to drain the oil and see the importance of the dryer and sight glass.

0%
Draining the Oil 2 minutes
The Importance of the Dryer 1 minute
Sight Glasses 1 minute

After Service and Repairs

After Service and Repairs

In this lesson, you will learn how to finish the reefer maintenance, by vacuum pumping the system for moisture, topping up the oil and adding new refrigerant.

0%
Vacuuming 1 minute
Adding Oil 1 minute
Adding Refrigerant 1 minute
Assessment: Reefer Unit Maintenance 5 minutes
2

Assessment: Reefer Unit Maintenance

  • 12
  • Questions
  • No time limit
  • 2
  • Attempts left
  • 70%
  • Passing threshold

Question 1 of 12

Why are coolants filled in their liquid state?

Question 2 of 12

How should a gas cylinder NOT be lifted?

Question 3 of 12

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

Question 4 of 12

What is true about the dryer?

Question 5 of 12

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

Question 6 of 12

Where should you check when checking for leaks?

Question 7 of 12

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

Question 8 of 12

Where do refrigerant gases accumulate?

Question 9 of 12

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

Question 10 of 12

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

Question 11 of 12

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

Question 12 of 12

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

You Passed This Quiz. Let’s Move On!

Good work! You just completed the quiz Assessment: Reefer Unit Maintenance. Let’s move on to the next.

Why are coolants filled in their liquid state?

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

How should a gas cylinder NOT be lifted?

In an upright position.
Your answer
In the top valve.
Your answer
With both hands .
Your answer

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

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

What is true about the dryer?

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

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

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

Where should you check when checking for leaks?

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

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

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

Where do refrigerant gases accumulate?

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

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

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

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

To avoid electrical shock.
Your answer
To reduce noise.
Your answer
To prevent overheating.
Your answer

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

Only HCFC.
Your answer
Only CFC.
Your answer
Both CFC and HCFC.
Your answer

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.
Your answer
By closing the pressure valve on the high-pressure side completely.
Your answer
By turning each side’s valve spindles clock-wise until you see a pressure reading on the gauge.
Your answer
Score: Attempts:

Too Bad! But That Wasn't Enough

Unfortunately you didn’t have enough correct answers to pass the quiz. Try again!

Why are coolants filled in their liquid state?

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

How should a gas cylinder NOT be lifted?

In an upright position.
Your answer
In the top valve.
Your answer
With both hands .
Your answer

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

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

What is true about the dryer?

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

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

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

Where should you check when checking for leaks?

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

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

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

Where do refrigerant gases accumulate?

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

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

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

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

To avoid electrical shock.
Your answer
To reduce noise.
Your answer
To prevent overheating.
Your answer

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

Only HCFC.
Your answer
Only CFC.
Your answer
Both CFC and HCFC.
Your answer

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.
Your answer
By closing the pressure valve on the high-pressure side completely.
Your answer
By turning each side’s valve spindles clock-wise until you see a pressure reading on the gauge.
Your answer
Score: Attempts:

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