Question

The compressor in an existing split system is being replaced. The system has a 35 ft line set. The factory charge for the condensing unit is 80 oz. The installation instructions state that the factory charge assumes a line length of 15 ft and gives the per foot adjustment as 0.6 oz per ft. How much refrigerant should be added to the system after the system has been evacuated?

Answer 1

After evacuating the system, 12 oz of refrigerant should be added to the initial factory charge of 80 oz, resulting in a total of 92 oz of refrigerant for the 35 ft line set.

Step-by-step explanation:

The student asked how much refrigerant should be added to the system after it has been evacuated due to a compressor replacement in an existing split system with a 35 ft line set. Since the factory charge of the condensing unit is for a 15 ft line, we must adjust for the additional 20 ft of line (35 ft - 15 ft). Using the given rate of 0.6 oz per foot, we calculate the additional amount of refrigerant needed.

Additional refrigerant required = 0.6 oz/ft × 20 ft = 12 oz

Therefore, after evacuating the system, 12 oz of refrigerant should be added to the factory charge of 80 oz, resulting in a total charge of 92 oz.