stacked pumps

Keith_8

Looked at a boiler replacement in a church today. Built in 1830 it was moved to its new location in 1950.

At that time the main church was added on to for day care and office's. A new boiler and monoflow system with 5 seperate zones was installed. The layout is well thought out and installed in accordance with good practices for the day.A small sixth zone was added since then. The monoflow zones (3)2", (1)1 1/2", (1)1" had 2 B&G 2" flanged pumps installed per zone, one stacked on top of the other. The pump configuration seems to be original from the initial install. At the walk thru of the space the boiler serviced it was relayed that the a few of the remote rooms were tough to heat.

MY 1st thought was low water temp to the rads due to the monoflow layout. 2nd thought was that the monflow restiction was the reason they stacked these B&G, 1/6th HP 2" flanged pumps and it was a flow problem.

On the retrofit I would think primary/ seconday with constant circ, outdoor reset and water balancing would even out the building temps. The building has been over radiated with cast iron freestanders further helping the cause for constant circ?

What do you guy's think?

Keith



The

Andrew Hagen (ALH)

I think

TRV's with constant circulation and outdoor reset. How about a condensing boiler(s)? How's the insulation on the distribution lines? How much hot water do they use? An indirect running on a condensing boiler might save some fuel too.

It sounds like you're going to save them considerable $$.

-Andrew

Big Ed

mono flow

A Mono flow system needs high volume of flow and has low head pressure so its odd that they stacked a pair. Hmmm? Restriction ? Someone found it easyer to stack then sister ????