over heating ...

Phil_6

I have a customer who bought a nice big mansion out here on Long Island this year and we have a little over heating problem. The system is about ten years old, the boiler room is beautiful if a little over done. Three 400,000 btu boilers (each of which could probably heat the whole house), tekmar motorized mixing valve for the 8000 sq ft or so of radiant, thirty-forty zones,out door reset, the works.
Then there are the two zones of baseboard. Top floor and the den over the garage.
The supply and return lines to these rooms tie into and out of the primary loop right next to each other. the circulator on the primary loop pushes the hot water through these zones pretty much 24/7. We added spring checks on the supply and return, as there were no flo valves, and the top floor is okay but the heat's still cranking away in the den.
I shut the valves off today but need a permanent fix. What do you think?

Phil

Phil_6

can't stop the flow

I have a customer who bought a nice big mansion out here on Long Island this year and we have a little over heating problem. The system is about ten years old, the boiler room is beautiful if a little over done. Three 400,000 btu boilers (each of which could probably heat the whole house), tekmar motorized mixing valve for the 8000 sq ft or so of radiant, thirty-forty zones,out door reset,tekmar boiler staging control, the works.
Then there are the two zones of baseboard. Top floor and the den over the garage.
The supply and return lines to these rooms tie into and out of the primary loop right next to each other. the circulator on the primary loop pushes the hot water through these zones pretty much 24/7. We added spring checks on the supply and return, as there were no flo valves, and the top floor is okay but the heat's still cranking away in the den which is right avove the boiler room.
I shut the valves off today but need a permanent fix. What do you think?

Phil

Jim Burke comfort zone

over heating

I would install motorized zone valves at each supply.

To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"

heatboy

Could it be............

all of the heat generated by the boiler room causing the overheating, Phil? Your issues are probably flow related, but it's something to consider?

To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"

Betz

zone valves

I'm not a professional but it does sound like zone valves will keep the hot water out of the loop. You could even hook them into a thermastat with a relay to get it to open and close. Could the heated water in the boiler be rising up into the den without the pump (ie. gravity)? I'd guess a zone valve would fix something like that also.

Phil_6

Actually..

..It's funny you should mention that. The den is over and a little to the side of the boiler room, but the kitchen, which is directly above it, is ripping hot from the equipment running. But that's a story for another day ;-)

I was thinking zone valves like the guys below mentioned as the quickest sure fix. The baseboards are hot pretty much all the time.

Thanks

steve l

overheating

where is the pump on the primary loop, is it in front of the zone tees or behind. If it is in front you can get ghost flow, from the higher pressure in front of the pump.
Put the pump after the zone tees and you eliminate the problem.

Phil_6

It's in front..

...like you suspect. Adding zone valves will be WAY easier in this case.

hr

Go with ZV's

I've had to do this on some overheating indirect tanks. Easier and cheaper than a complete repipe, and 100% shut off.

hot rod

To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"

Ken D.

Overheating.

Many years ago we had a development of large split level homes. The upper floor of each would over heat. They had Taco zone valves. We replaced the zone valves several times to no avail. We replaced with Honeywell ZV to no avail. We ended up installing flow vaves on supply with the zone valves and that took care of the problem. Worth investigating.