Weil-McLain Series 2 Manual page 56

® S
ERIES
Multiple boiler installations
Figure 63 Piping schematic — typical piping for multiple ECO boilers, using Weil-McLain Easy-Fit manifolds
1 Flow/check valve
2 Isolation valves (when used)
3 Cap
4 Easy-Fit® Manifold (supply) — layout and size per page 55
5 Easy-Fit® Manifold (return) — layout and size per page 55
6 Primary circulator
7 Expansion tank (diaphragm type)
8 System air eliminator
9 System automatic air vent
10 Pressure reducing valve
56
2
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G
AS FIRED WATER BOILER
Legend for Figure 63
— Boiler Manual
(continued)
11 Check valve or backfl ow preventer, as required by
applicable codes
12 Cold water supply
13 Supply water temperature control (when used)
14 Low water cutoff (when used)
15 Water fl ow switch (when used)
16 Boiler circulators
17 System supply
18 System return
19 Boiler P/T gauge, relief valve and discharge piping, installed
per ECO Boiler Manual
20 Purge/drain valve
Part number 550-142-190/1218