DHW in prim/sec with TT Solo 110

modconwannabe

My skilled but careless and error-prone plumber installed a TT Solo 110 with Trimax control and an all new hydronic system this past winter. I won't go into all his foibles, but they're enough that I don't trust his work and am hoping for clarification from the experts here.
System is piped primary/secondary with two zones on top floor for panel radiators, a single zone of underfloor radiant for main floor, and then a single zone of cast iron baseboard for bottom floor. It is connected to outdoor reset. The Prestige solo 110 has a dedicated DHW outlet with its own pump built in, however he decided to cap that and instead pipe the DHW as one of the secondaries. Is that correct/desirable? I had wanted the DHW set as priority and am not sure if this can be accomplished this way? Note the only mixing valve is for the radiant floor.

The other issue that has crept up is that when the DHW call happens, it forces some amount of hot water through the entire system, so that in April when the weather thawed I had to go to the mech room and physically shut off the heating zones. I'm not sure if that's because he's got too much head, or the pump speed is too high (the internal boiler pump was set to high), or if a check valve of some sort is required somewhere in the system.

Any input would be most appreciated.

Zman

Can you post a picture of the piping?

modconwannabe

I'll try but it's extremely hard to get a wide enough shot as my mech room is about 5 x 5. Anything you want to see in particular?

Zman

The near boiler piping and the zone branches. Multiple pictures are OK. Sometimes it is easier to do a quick sketch.

Paul48

Time to bring in a plumber that knows this equipment. The piping that incorporates the internal circulator is for Central Heating. That would be the Primary circ. Like my father use to say," If all else fails, read the directions".