Section 4: Type III (Low-Pressure Appliances)

What type of systems require Type III certification?

• Small appliances

• High-pressure appliances

• Low-pressure appliances

• All appliances

What is a common low-pressure refrigerant?

• R-22

• R-404A

• R-11

• R-134a

Which of the following is NOT a characteristic of low-pressure appliances?

• A) Operate below atmospheric pressure

• B) Typically use R-11 or R-123

• C) Require recovery of refrigerant

• D) Operate at high temperatures.

What is the proper method for recovering refrigerant from low-pressure systems?

• Using a vacuum pump

• Venting

• Using a recovery machine

• Evaporating

What should be done before opening a low-pressure appliance?

• Ensure it is charged

• Evacuate the system

• Disconnect power

• Both B and C

What is the maximum charge limit for low-pressure appliances?

• 5 lbs

• 15 lbs

• 50 lbs

• No limit

Which refrigerant is considered an alternative to R-11?

• R-134a

• R-22

• R-123

• R-410A

What must technicians do if a low-pressure system has a leak?

• Ignore it

• Repair it promptly.

What is the role of a pressure regulator in a low-pressure system?

• Increase pressure

• Maintain a constant low pressure

• Vent refrigerant

• Recover refrigerant

How often should recovery equipment be tested for efficiency?

• Monthly

• Annually

• Every five years

• Only when it breaks