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EPA Section 608 — Type III

Charging and service: practice questions

Our EPA 608 Type III bank has 10 questions on this topic. Here are 5 of them with answers; the full mock exam draws from every topic, like the real one.

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Question 1

When charging a low-pressure chiller from a deep vacuum, what should be introduced first?

  1. Liquid refrigerant, as fast as possible, to break the vacuum quickly
  2. Water
  3. Oil
  4. Vapor, until the saturation temperature is above 32 °F
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D. Vapor, until the saturation temperature is above 32 °F — Charging liquid into a deep vacuum can freeze the water in the tubes.

Question 2

Why is moisture in a low-pressure system harmful?

  1. It lubricates bearings
  2. It increases cooling capacity by absorbing heat in the evaporator
  3. It makes leaks smaller
  4. It reacts with refrigerant and oil to form acids
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D. It reacts with refrigerant and oil to form acids — Acids damage motor windings and metals.

Question 3

What should be checked on the water side of a chiller before charging refrigerant?

  1. That the water has been drained completely from both the evaporator and condenser
  2. That the cooling tower is off
  3. That the water is frozen
  4. That water is flowing through the evaporator and condenser tubes
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D. That water is flowing through the evaporator and condenser tubes — Flowing water prevents freezing during charging.

Question 4

Why should air be kept out of a low-pressure system?

  1. It raises condenser pressure, reduces efficiency, and moisture causes acids
  2. It cools the condenser
  3. It reduces leaks
  4. It lubricates the compressor
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A. It raises condenser pressure, reduces efficiency, and moisture causes acids — Air brings moisture, which reacts with refrigerant and oil.

Question 5

What does high condenser pressure in a low-pressure chiller often indicate?

  1. A clean system
  2. A broken rupture disc
  3. Non-condensables in the condenser
  4. A refrigerant undercharge and nothing else
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C. Non-condensables in the condenser — Air collects in the condenser and raises pressure.

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