In a multi-zone system, _________ valves prevent continuous circulation of hot water after the zone control has stopped the circulator pump.
a. Isolation
b. By-pass
c. Air separator
d. Balance
e. Flow control
Answer: E
In a multi-zone system, _________ valves prevent continuous circulation of hot water after the zone control has stopped the circulator pump.
a. Isolation
b. By-pass
c. Air separator
d. Balance
e. Flow control
Answer: E