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.
52
Section: Installation
Summary of Contents for SL Series
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Page 12: ...Figure 5 Top view SL 40 399 G3 Figure 6 Bottom view SL 40 399 G3 8 Section Specifications...
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Page 64: ...Figure 40 Electric wiring connections 60 Section Installation...
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Page 110: ...Internal wiring diagram Figure 46 Internal wiring diagram 106 Section Appendices...
Page 111: ...Sequence of operations Figure 47 Sequence of Operation 107 Sequence of operations...