I have been in the field for over 40 years and came across this problem that I wonder if anyone else has ever witnessed and if so what was the cure. I have a 6 zone hydronic system that has taco circulators that have the switching relay incorporated within. The system has been installed for years and was working fine. I was called and discovered that one zone was not working. After checking the circulator was pulling high amps so I changed the circulator. The system did not change and the zone did not change. Here is the tricky part. When the zone is calling by itself it works fine. When there is a call on all the other zones we loose flow through the one zone that I changed the circulator on. The boiler pressure is at 15psi and it is a single story ranch. The zone that is having the issue is piped using radiators and the other 5 zones are baseboard. As I said nothing changed in the piping. Customer just said no heat in that zone. Anyone got any ideas??
↧