Pressure relief valve (shipped with the boiler): no isolation valve permitted between
boiler and relief valve
Air vent purchased separately
Microbubble air eliminators are best installed where the fluid is at the highest
temperature and lowest pressure, on boiler outlet at expansion tank connection.
Expansion tank connection (point of no pressure change) should be on the suction side
of the circulator, with minimal pressure drop between.
Boiler (primary) pump
To/ from load
Dirt separator recommended
Fill station with isolation valve closed, or fill tank.
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