Is this true P/S piping on a noritz condensing boiler

bob eck

Looks to me like this is a boiler bypass not true P/S piping
Thought please
Boiler only lasted 10 years

hot_rod

Is that ball valved open or closed. Can we see more of the piping top the right? is there another circulator down stream?

I have see tees used like that before, in P/S a ball valve does present some pressure drop between the tees maybe a few inches worth of pipe equivalent.

Ironman

Nah, that's a bypass, though it may not have been intended to be.
What good is the LWCO installed below the boiler?

unclejohn

I just see a ball valve with the handle removed like a by-pass.

hot_rod

if the valve is wide open, AND another circ down stream, I'd consider it an attempt at P/S.

If the valve is closed and there is another circ downstream you have series pumps.

If the valve is partially opened with a single pump it is bypassing some flow.

If it is partially open and there are two pumps, hard to predict what type of flow rates are going on or how the valve position was determined.

A manual bypass is a fairly simplistic boiler protection method. At one certain condition is is adequate

EBEBRATT-Ed

My guess is one pump no PS