✓ TradeExamPro

TradeExamPro › HVAC & Refrigeration › EPA 608 certification

Type III: low-pressure practice questions

31 questions from the epa 608 certification practice test.

Beta. These questions are new. They were written and checked with AI and have not yet been reviewed by a licensed tradesperson. If one looks wrong, use “Report this question” and we will fix it.

Type III: low-pressure practice test

10 questions, graded as you go, with the reason for every answer. No sign-up.

What this covers

Sample questions

R-123 belongs to which group of refrigerants?

  1. HCFC
  2. CFC
  3. HFC
  4. HFO
Show the answer

A. HCFC

R-123 is an HCFC that replaced CFC-11 in low-pressure chillers. Because it still contains chlorine it has a small ODP and is covered by the Section 608 leak repair rule.

Reference: Clean Air Act Title VI (Class II substances)

From where does a purge unit draw its suction?

  1. The bottom of the evaporator
  2. The compressor oil sump
  3. The economizer float chamber
  4. The top of the condenser
Show the answer

D. The top of the condenser

Non-condensables are carried to the condenser and collect at its top, above the liquid, so that is where the purge unit connects. They do not settle in the evaporator.

Reference: EPA Section 608 Type III

A low-pressure chiller's purge unit is running far more often than it used to. What does this most likely indicate?

  1. The chiller is overcharged
  2. The condenser water is too cold
  3. Air is leaking into the chiller
  4. The oil heater has failed
Show the answer

C. Air is leaking into the chiller

Frequent purging means non-condensables keep entering, which points to a leak on the vacuum side. Each purge cycle also loses some refrigerant, so the leak should be found and repaired.

Reference: EPA Section 608 Type III

Other topics