🔍 Key Concepts

• Identify which side of the manifold in figure A is the low‑pressure (suction) side and which is the high‑pressure (discharge/liquid) side, using the blue vs. red gauge and hose colors. • Recall that vapor charging is normally done through the suction (low‑pressure) side of the system and uses the vapor valve on the refrigerant cylinder, not the liquid valve. • During a dehydration evacuation, the vacuum pump is connected to the center vacuum port, and the manifold valves are used to pull vacuum on the connected system sides.

💭 Think About

• From figure A, match fittings 7, 8, 9, and 10 to: low‑side service valve, high‑side or liquid‑line service valve, refrigerant cylinder (vapor or liquid), and vacuum pump. Which numbers are grouped under the yellow "REF" area vs. the black "VAC" area, and which are under the blue vs. red sides? • Ask yourself: for a vapor charge after evacuation, which port must lead directly to the suction service valve, and which port must go to the refrigerant bottle vapor valve so vapor flows into the low side when you open the correct manifold valve? • Eliminate any option that sends liquid from the cylinder into the suction side during charging as vapor, or that connects the cylinder to the wrong side of the manifold for low‑side charging.

✅ Before You Answer

• Verify which fitting number is directly under the VAC label in figure A (this must go to the vacuum pump suction port in all procedures). • Verify which fittings are under the REF label and which side of the manifold (blue/low vs red/high) each one serves; match those to suction, discharge/liquid line, and refrigerant bottle vapor valve. • Confirm that your chosen option ends with refrigerant vapor entering the system through the suction service valve, not through the discharge or liquid line.