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17 Nov 2000 at 4:40 pm
#288778
Harold Kestenholz
Participant
Once the water pressure inside the system has dropped low enough to admit air, it often takes time before the entrapped air is removed. If the system does not have a diaphragm expansion tank and an automatic air vent, or a properly installed non-diaphragm tank and air elimination system, several purges of air may be required.
Call the repairman to eliminate the remaining air that is causing the banging.