Weil-McLain ECO 70 Manual page 52

TM -
G
AS FIRED WATER BOILER
Multiple boiler installations
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 51
5 Easy-Fit® Manifold (return) — layout and size per page 51
6 Primary circulator
7 Expansion tank (diaphragm type)
8 System air eliminator
9 System automatic air vent
10 Pressure reducing valve
52
— Boiler Manual
(continued)
11 Check valve or backflow preventer, as required by applicable codes
12 Cold water supply
13 Supply water temperature control (when used)
14 Low water cutoff (when used) (place above primary header)
15 Water flow 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 550-142-122/0513