Welcome! Here are the website rules, as well as some tips for using this forum.
If you've found help here, check back in to let us know how everything worked out.
It's a great way to thank those who helped you.
Check please on new boiler layout
First thank you to Zman and Hot Rod for the input on my last question regarding the proper circulator for the reconfiguration of my radiant system. The radiant system has been in operation for 4 years and warms nicely. Now switching from a Phoenix Light Duty and HX on the closed side to a boiler and indirect. Long story but glad to be rid of that unit.
Zman sent me some homework and I figured the head and GPM for the individual zones and found that the entire system needs 8GPM and highest head was 9.1.(So I think). Did a recalculation of the heat loss using the Slant Fin program as others have suggested. Total BTU is 76K.
I have accumulated parts and ready to start putting things together but wanted your input on my diagram. All pumps are IFC and I have maintained the recommended straight pipe on all upstream runs to it. I do have a couple of questions also if you would be oblidging.
1. Are the air and dirt seperators in the right place. I usually see the air above the expansion tank but the Caleffi says closest to boiler outlet and low pressure area. Given the location of the expansion tank, I'm not sure if this primary loop is a low pressure area given that it is pumped hard with an 011 pump to achieve the recommendation for the boiler head/GPM of 22FT at 10 GPM
2. Speaking of the expansion tank. The circulator for the zones is pumping away from the tank but what about the primary loop. How does that fit in?? Is there somewhere else I should put it?
3. Not sure if any other check valves are needed. I thought that maybe a ballcheck valve on the supply to the indirect. I thought I remember that Hot Rod had mentioned something like that on another post to prevent any ghost flow from that circuit. Also should there be checks on the supply to the 2nd floor radiant zones. Returns have zone valves.
Any other suggestions would be welcome. Thanks again