What is the best pH level to maintain in a water tower?
A) The pH of the water has very little effect on the operation of the cooling tower.
B) Higher than 9
C) Between 6.5 and 9
D) Lower than 6
Question 2
Which of the following refrigerant safety designations indicate the refrigerant would require more than 400 parts per million to be hazardous?
A) B1 B) B3 C) A1 D) B2