Performed inspection in cooling x’2. Found smaller unit slightly low on charge. Added 1lb r410a to charge to specs. R- 410a Adjust Refrigerant level: 1st Pound RECOMMEND LEAK SEARCH BEFORE ADJUSTING REFRIGERANT CHARGE Purge gauges to ensure no non-condensables enter system Use digital scale to weigh in refrigerant Adjust according to units TP chart and super heat and sub cool