🔍 Key Concepts

• Behavior of discharge pressure and suction pressure when refrigerant charge is too high or too low • Effect of a fouled water-cooled condenser on head (discharge) pressure and suction pressure • What happens to suction and discharge pressures if hot gas leaks back to the low side

💭 Think About

• For each option, picture what happens to condenser temperature and pressure, and to evaporator load. Does that make suction go up or down? Discharge go up or down? • Ask yourself: in a normally operating system, what specific fault would allow high‑pressure gas to influence low‑pressure side readings, or low‑side conditions to influence high‑side readings? • Think through which fault would tend to raise both the low‑side and the high‑side pressures at the same time, rather than one going up while the other goes down.

✅ Before You Answer

• For each answer choice, decide: does it cause both high suction and low discharge, or does it more naturally cause high discharge and low suction, or some other combination? • Verify how a fouled condenser actually affects discharge pressure on a water‑cooled system (does it drive it up or down?). • Consider whether overcharge or superheat misadjustment would more likely raise or lower suction pressure, and how they typically affect discharge pressure.