Question

9. The factory charge in a split system, using R-22, shows 6 lb. 8 oz. in the outdoor condensing

unit and 2 oz. in the evaporator. The 3/8" liquid line contains 0.48 oz. per foot and the 7/8"
suction line contains 0.10 oz. per foot. The refrigerant lines are 30' long. What is the correct
refrigerant charge for this system?

Answer 1

The correct refrigerant charge for the system is 123.4 oz.

Step-by-step explanation:

To calculate the correct refrigerant charge for the system, we need to add up the refrigerant in the outdoor condensing unit, evaporator, liquid line, and suction line. First, convert the weight measurements to ounces. The outdoor condensing unit contains 6 lb 8 oz = 6 * 16 + 8 = 104 oz of refrigerant. The evaporator contains 2 oz of refrigerant.

Next, calculate the total refrigerant in the liquid line and suction line. The liquid line is 30' long and contains 0.48 oz per foot, so the total refrigerant in the liquid line is 30 * 0.48 = 14.4 oz. The suction line is also 30' long and contains 0.10 oz per foot, so the total refrigerant in the suction line is 30 * 0.10 = 3 oz.

Finally, add up all the refrigerant components to find the correct charge for the system. The total refrigerant charge is 104 + 2 + 14.4 + 3 = 123.4 oz.