Installation Guide
Part number 550-100-066/0608
25
g a s -f i r e d w at e r b o i l e r — Boiler Manual
Multiple boiler water piping (continued)
Legend — Figure 26
1 Flow/check valve (each boiler)
2 Isolation valves (when used)
3 Cap
4 Easy-Fit® Manifold (supply) — layout and size per page 24
5 Easy-Fit® Manifold (return) — layout and size per page 24
6 Primary circulator
7 Expansion tank (diaphragm type)
8 System air eliminator
9 System automatic air vent
10 Pressure reducing valve
11 Check valve or backow preventer, as required by applicable codes
12 Isolation valve
13 Cold water supply
14 Supply water temperature control (when used)
15 Low water cutoff (when used) (place above primary header)
16 Water ow switch (when used)
17 Boiler circulator (each boiler)
18 System supply
19 System return
20 Boiler relief valve and discharge piping, installed per Ultra Boiler
Manual
24 Strap system supply and return sensors to lines as shown, at least 6
pipe diameters (but no more than 3 feet) from boiler connection
tees. For pipe sizes larger than 3-inch, contact Weil-McLain for well-
mounted sensors.
Piping schematic — typical piping for multiple Ultra boilers, using Weil-McLain Easy-Fit manifolds