Circulator on return or supply side of the boiler?

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Old 03-29-13, 09:06 AM
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Circulator on return or supply side of the boiler?

in a scenario when a boiler is piped as a secondary loop, does it matter if circ is on the supply or return side of the boiler?

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Last edited by NJT; 03-30-13 at 03:36 PM.
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Old 03-29-13, 09:08 AM
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Always pump away from the expansion tank................

Here is a cool book to read.

Pumping away: And other really cool piping options for hydronic systems: Dan Holohan: Amazon.com: Books
 
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Old 03-29-13, 09:11 AM
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boiler recirc is hydraulically separated from the primary loop and the expansion tank, so should it not matter?
 
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Old 03-29-13, 10:00 AM
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For the boiler loop circ there will be no interaction with the PONPC on the primary loop, so as far as the location of the tank in relation to the BOILER pump it doesn't matter.

It CAN matter to the boiler and/or the pump though. If the heat exchanger in the boiler is a high head design it is better to pump TOWARD the boiler.

Boiler manufacturer may specify this...
 
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Old 03-29-13, 10:22 AM
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that makes sense. thank you guys!
 
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Old 03-30-13, 03:39 PM
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I don't believe you need the check valve on the boiler loop circulator.
 
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Old 03-30-13, 07:53 PM
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I would move the isolation valve on the supply above the flow check for servicing the items between they two valves. One on the return and one on the supply.
 
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Old 03-31-13, 08:34 AM
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rbeck, I believe you mean the heating supply?

Or use IFC circs with isolation flanges.
 
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