Weil-McLain Ultra Commercial Installation And Start-Up Manual page 22

COMMERCIAL GAS
Multiple boiler water piping
Piping schematic — typical piping for multiple Ultra boilers, using Weil-McLain Easy-Fit manifolds
1 Flow/check valve (each boiler)
2 Isolation valves (when used)
3 Cap
4 Easy-Fit® Manifold (supply) — layout and size per page 21
5 Easy-Fit® Manifold (return) — layout and size per page 21
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 backflow preventer, as required by applicable codes
22
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FIRED WATER BOILER
Legend — Figure 15
— Boiler Manual
(continued)
12 Isolation valve
13 Cold water supply
16 Water flow 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
25 Boiler drain valve, ¾" NPT or larger
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.
31 Install a union on the boiler supply and return connections as close
as possible to the boiler to allow disconnection for service when
required.
Part number 550-100-086/0809