🔍 Key Concepts

• Effect of suction valve leakage on compressor suction pressure and capacity • How refrigerant charge (too much or too little) typically affects suction vs. discharge pressures • Behavior of air/non‑condensables in a system (which side they tend to raise pressure on)

💭 Think About

• Think about which fault would allow gas to flow backwards or not be fully compressed on each stroke, and what that would do to suction pressure. • For each option, ask: would this mainly increase suction pressure, discharge pressure, or lower both? • Consider which problem would most directly reduce the compressor’s ability to pull the evaporator pressure down.

✅ Before You Answer

• Verify which condition causes the compressor to lose effective pumping capacity on the suction side. • Check your understanding of where non‑condensable gases accumulate and which pressure (suction or discharge) they influence most. • Confirm whether a loss of refrigerant is more likely to lower or raise suction pressure.