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Call today 1 apartment (out 16 ) no hot water in shower.
Assumption Spindle stuck on symmons valve.
Get there find out huge temp. swings at valve (dropped 30 degrees) @ one point.
tenant says others in buildings noticing it too but she is the only one that has called.
There is a turbomax t 65 off the the boilers with a watts n170 mixer. ( I made diagrams on ms paint and attached)
1st thought ; mixer needs to be "rebuilt" but when i was looking at the way it was piped the recirc was not tide in where I would tie it in. I noticed hot water backing past the check (that check isn't closing) on the cold,and back down into the bottom feed .I shut the recirc off i could feel the cold move back threw the check to mixer.( see attached turboma.jpeg) I could also see the temp change on the domestic mixed line
I have never dealt with turbomaxs' or ergos. My experience with traditional indirects has been to put the recirc back into the bottom of the tank (preferably with gravity). with out closing the system. I have never closed a system or used a potable expan. tank
So my question is if i move the recirc to where I have it in attached turbomax2 .jpeg will I have to add a check to keep it from going back up the mixer, hence closing the system off. I know what ever expan tank they put there can't be adequate (smaller than a extrol 15). Plus shouldn't it be on the cold?
I apologize for the lack of details but since we only take care of the plumbing in these buildings I thought the management company would have the heating company who installed the system a few years ago handle this but for what ever reason they want me to.
Thanks for any advise