Supply side circulation

Boilerpro_3

Supply side pumping. In order of installation on supply to system...Heat source (boiler), connection to compression tank and pressure reducing valve, air seperator, and then pump. Pumps create pressure differential from thier inlet to thier outlet in order to make water move. By putting the pump on the supply after the other equipment the pressure it creates is added to the fill pressure of the system to help increase the pressure out in the system. This helps push air in the system back into the water where it can then move back to the air separator to be removed. Also, with the air separator at the pump suction, you will always have water here with little or no air mixed in it, so the pump will be very unlikely to cavitate and you will get full flow through the system as soon as it is filled, further helping to push any air stuck out in the system back to the separator. Also, if the pump is aimed at the relief valve at the boiler, its added pressure during operation can cause the relief valve to pop. These are, from my perspective, the biggest benefits from pumping away.

Boilerpro

Pat Macdonnell

I'm asking cuz I don't know

What is the advantage of putting the circulator on the supply instead of the return? Why do boiler manufacturers install circulator on return in most packages?
I'm sure that this is "Wethead 101" but I slept through class.
...and a blessed St. Paddys' Day to all!

Jackchips

Excellent response

by (the) Boilerpro.

In answer to your second question-costs.

Boilerpro_3

Thanks, Mr Chips....NM

Kritz_3

Pumping Away

Hey if you get a chance take a look at H.T.P. (Munchkin) installation
drawing 1c. They have a pump on the return side of the primary loop
going into the boiler then the air seperator/fill/Ex tank leading to the
circulator supply header. Is this correct or since the tee's are closely
spaced that lazy H2O won't want to burden the rest of the system
with increased pressure? Couldn't you put the closely spaced tee's
down stream of the air sep..... and flop the pump to the supply side
pumping away from the boiler, then the point of no pressure change
would be at the Ex tank. Am I having problems seeing the forest through the trees or am I barking up the wrong tee?

Kritz

hot_rod

Pumping towards the boiler

Actually there are some instances when this is correct. Many copper tube and low mass prefer this. But still pump away from the PONPC.

This P/S example also shows the pumps towards the boiler.
Depends on the "big picture" in regards to your piping layout.


hot rod