Boiler Manual - Weil-McLain
Boiler Manual - Weil-McLain
Boiler Manual - Weil-McLain
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GV90+ gas-fired water boiler — <strong>Boiler</strong> <strong>Manual</strong>Multiple boiler water piping (continued)Figure 32 Piping schematic — typical for multiple GV90+ boilers, using <strong>Weil</strong>-<strong>McLain</strong> Easy-Fit manifoldsLegend — Figure 321 Flow/check valve (each boiler)2 Isolation valves (when used)3 Cap4 Easy-Fit® Manifold (supply) — layout and size perpage 245 Easy-Fit® Manifold (return) — layout and size perpage 246 Primary circulator7 Expansion tank (diaphragm type)8 System air eliminator9 System automatic air vent10 Pressure reducing valve11 Check valve or backflow preventer, as required by applicablecodes12 Isolation valve13 Water flow switch (when used)14 Supply water temperature control (when used)15 Low water cutoff (when used) (place above primary header)16 Cold water fill line — see Figure 15, page 14 for typicalcomponents18 System supply19 System return20 (Not shown) <strong>Boiler</strong> relief valve and discharge piping, installedper GV90+ <strong>Boiler</strong> <strong>Manual</strong>30 Long end of manifoldPart number 550-142-054/1211 25