IBC SL Series Installation & Operating Manual page 56

Figure 35 Primary-secondary piping concept with hydraulic separator
Pressure relief valve (shipped with boiler): no isolation valve permitted between
boiler and relief valve.
Hydraulic separator.
Expansion tank connection (point of no pressure change) should be on the suction
side of the circulator, with minimal pressure drop between.
Fill station with isolation valve closed, or fill tank.
Supply piping to load 1, load 2, load 3, load 4.
Return from loads.
Boiler (primary) pump.
Air vent (available separately as P-195).
The boilers can supply multiple heating loads with compatible supply temperature
requirements. Always ensure that loads sensitive to high temperatures are protected using
means such as mixing valves.
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Section: Installation