Zl700
DIY Senior Member
Good pictures
The main issues are now that I've seen pictures:
1. No boiler pump, this should be primary/secondary piping
2. Mixing valve is too small (high C.V.) restricting flow (3/4 passes only about 43,000 BTU's)
3. Loops are too long
4. 1" piping to small (would be OK with 6 1/2" loops)
5. Manifolds are too small for that many loops (that looks like ones for 3/8" loops)
6. A detailed radiant design may determine that plates are needed, if plates wont do it or enough, supplemental heat may be required such as a kicspace heaters, convector, air-ocer hot water coil or baseboard, probably run on high temp zone
7. When finished there will be way to many loops on one pump and manifold, as you are feeling now already. Strong consideration should have been given to using 2 pump/manfold/mixing valve setups (up and downstairs)
8. Tubing is a bit close to joists that act as a heat sink, should be closer together for a true 8" cc.
If you followed the design, Fred needs some instruction on proper design and installation techniques. You wont even see such a farce in a boiler manufactures instructions.