Weil-McLain 4 Series Manual page 61

®
Series 4
Multiple boiler installations
Figure 62
1 Flow/check valve (each boiler)
2 Isolation valves (when used)
3 Cap
4 Easy-Fit® Manifold (supply) — layout and size per page 60
5 Easy-Fit® Manifold (return) — layout and size per page 60
6 Primary circulator
7 Expansion tank (diaphragm type)
8 System air eliminator
9 System automatic air vent
10 Pressure reducing valve
Part number 550-100-400/0119
gas-fired water boiler — Boiler Manual
Legend — Figure 62
(continued)
11 Check valve or backfl ow 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 fl 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.
26 Temperature/pressure gauge
61