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weil-Mclain peg 40 steam

just installed  a weil-McLain peg 40 steam boiler.

I ran a hot water loop, and im having a problem with circulation thru the boiler.

I pulled the supply off the return right off the boiler and dumping it back in where the boiler drain tapping is. everything is below the water line ( pump, flow control valves ). With this boiler should I be using the return tappings on each side of the boiler to get proper circulation ?
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