Bypass valve?

adambuild · December 2012

Happy Holidays Wallies! Quick question! I was reading the I&O manual for the new TT Prestige with Trimax control. It has a diagram for piping with zone valves and shows a bypass valve at the end. My two baseboard zones go out and back in 3/4" copper and the piping from the boiler would be 1" without primary/secondary. Will a 3/4" bypass valve be sufficient at the ends of the manifold to give the boiler enough flow?

Thanks, Adam

Steve Whitbeck · December 2012

P/S piping

I would suggest primary secondary piping instead of the bypass valve.

Probably about the same cost for either but bypass valves have a bad habit of sticking open. If you are worried about water hammer on the zones then go with a delta pressure pump on the zone side.

Just about every bypass valve I have seen in the last 10 years wasn't working.

adambuild · December 2012

Thanks!

Hi Steve,

Thanks for the response. I've never used a bypass valve. I always pipe P/S. The manual however shows a bypass valve both ways, straight through and with P/S!? I guess I'll call TT tomorrow to see if it can be left out. Kindly let me know if you have any other thoughts.

Thanks again, Adam

gennady · December 2012

bypass

i think they recommending bypass valve for the purpose of setting pressure drop across radiators and as a result setting flow rate. Same as circuit setter.

SWEI · December 2012

use a pressure-dependent circulator

pump direct, and don't worry about it. If it's 110, consider replacing the internal circ with one.

Bypass valve?

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