EPA Section 608 — Type III
Definitions: practice questions
Our EPA 608 Type III bank has 14 questions on this topic. Here are 5 of them with answers; the full mock exam draws from every topic, like the real one.
Question 1
What does a purge unit do on a low-pressure chiller?
- Removes air and other non-condensables from the system
- Removes oil from the evaporator
- Adds refrigerant
- Pressurizes the system with nitrogen for leak testing before charging
Show the answer
A. Removes air and other non-condensables from the system — Non-condensables collect at the top of the condenser and are purged.
Question 2
Which certification types allow a technician to work on low-pressure appliances?
- Section 609 only
- Type II only
- Type III and Universal
- Type I and Type II only
Show the answer
C. Type III and Universal — Universal includes all types.
Question 3
Why are high-efficiency purge units used?
- To reduce the amount of refrigerant released with the non-condensables
- To add refrigerant automatically
- To increase the system pressure
- To heat the evaporator
Show the answer
A. To reduce the amount of refrigerant released with the non-condensables — Purge units release some refrigerant along with the air they remove.
Question 4
Which repair is a 'major repair' on a chiller?
- Replacing a sensor
- Removing the compressor or a heat exchanger
- Changing a fuse
- Cleaning the condenser tubes without opening the refrigerant circuit
Show the answer
B. Removing the compressor or a heat exchanger — Major repairs require full evacuation to the required level.
Question 5
Low-pressure refrigerants have which boiling point characteristic at atmospheric pressure?
- Exactly 32 °F
- Between -58 °F and 50 °F
- Below -58 °F
- Above 50 °F
Show the answer
D. Above 50 °F — This is why the evaporator runs in a vacuum.