Weil-McLain Ultra Manual page 26

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gas fired water boiler
Multiple boiler water piping
Figure 27
Piping layout — typical piping for multiple Ultra boilers, using Weil-McLain Easy-Fit manifolds
1 Flow/check valve (each boiler)
2 Isolation valves (when used)
3 Caps
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
26
— Boiler Manual
(continued)
Legend — Figure 27
9 System automatic air vent
13 Cold water supply
17 Boiler circulator (each boiler)
18 System supply
19 System return
20 Boiler relief valve and discharge piping, installed per Ultra Boiler Manual
30 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.
Part number 550-100-066/0608