An R22 air conditioning system is operating with a head pressure of 220 psig and a suction pressure of 68.5 psig. A temperature measurement taken on the suction line 8 inches from the suction service valve reads 60 degrees. A temperature measurement taken on the liquid line leaving the condenser reads 90 degrees F. What is the low side superheat?
A: 10 degrees of superheat
B: 15 degrees of superheat
C: 20 degrees of superheat
D: 30 degrees of superheat
