Which of the following statements about vacuum breakers is false?
a) They are used to prevent freeze-ups caused by negative pressure in the coil.
b) The vacuum breaker must be installed before the control valve and as near as possible to the outlet connection of the coil.
c) Check valves used as vacuum breakers may be left open to the atmosphere.
d) Check valves used as vacuum breakers may be connected to the return header.
e) Vacuum breakers are essential for satisfactory functioning of the steam trap.
Answer: B