Hi -
on one of my jobs I noticed that on a 3 zone hydronic system with individual circ pumps all zones stay warm when shut off by the stat. Even if only one pump is on all zones seem to be fed. When I look at the setup I only see shutoff valves at the pumps but no check valves. Is the lack of check valves making the hot water circulate even without the circ pump(s) on?
While I'm at it one more question please ... is it a code requirement that all electrical feeding circ pumps burners, etc are BX cable?
Thanks ...
on one of my jobs I noticed that on a 3 zone hydronic system with individual circ pumps all zones stay warm when shut off by the stat. Even if only one pump is on all zones seem to be fed. When I look at the setup I only see shutoff valves at the pumps but no check valves. Is the lack of check valves making the hot water circulate even without the circ pump(s) on?
While I'm at it one more question please ... is it a code requirement that all electrical feeding circ pumps burners, etc are BX cable?
Thanks ...