Practice Test GeeksEPA 609 - EPA Section 609 Refrigerant Certification Practice Test
← All EPA 609 Flashcard Decks

MVAC System Components & Operation Flashcards

6 cards from real EPA 609 practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 6 MVAC System Components & Operation flashcards as text

  1. What does a typical MVAC manifold gauge set measure?

    Answer: Both high-side and low-side pressures simultaneously

    A manifold gauge set has two gauges — a blue low-side gauge and a red high-side gauge — to simultaneously monitor both system pressures.

  2. What is a typical low-side pressure reading for a properly charged R-134a MVAC system at idle?

    Answer: 25–45 psi

    A properly functioning R-134a system typically shows 25–45 psi on the low side at idle in normal ambient conditions.

  3. What is a typical high-side pressure reading for a properly charged R-134a MVAC system?

    Answer: 150–250 psi

    The high side of an R-134a system typically operates between 150–250 psi depending on ambient temperature and load.

  4. What causes abnormally HIGH low-side pressure and HIGH high-side pressure in an MVAC system?

    Answer: Overcharge or condenser cooling failure

    Both pressures being high indicates an overcharged system or a condenser that cannot reject heat properly.

  5. Which service port connects to the LOW side of an MVAC system?

    Answer: The larger port (typically near the compressor inlet/accumulator)

    The low-side service port is larger and is located on the suction side of the compressor or near the accumulator.

  6. A sight glass showing bubbles in an R-134a system indicates:

    Answer: The system may be low on refrigerant

    Bubbles in the sight glass indicate that refrigerant is not fully liquid at that point, suggesting a low charge or restriction.