Weil-McLain SlimFit Manual page 23

SlimFit
™
commercial condensing gas
Multiple boiler water piping
Figure 21
Piping schematic — typical piping for multiple SlimFit boilers, using multiple boiler manifolds
1 Flow/check valve (each boiler)
2 Isolation valves (when used)
3 Strainer (recommended one each boiler on return line)
4 Multiple boiler manifold (supply) — layout and size per Figure 12, page 15
5 Multiple boiler manifold (return) — layout and size per Figure 12, page 15
6 Primary pump
7 Expansion tank (diaphragm type)
8 System air eliminator
9 System automatic air vent
10 Pressure reducing valve
Part number 550-100-116/0713
-
fired water boiler
(continued)
Legend — Figure 21
11 Check valve or backflow preventer, as required by applicable codes
12 Isolation valve
13 Cold water supply
16 Water flow switch (when used)
17 Boiler pump (each boiler)
18 System supply
19 System return
20 Boiler relief valve and discharge piping, installed per SlimFit Boiler Manual
25 External drain/blowdown valve, when used, ¾" NPT or larger
30 Strap system supply sensor to line as shown, at least 6 pipe diameters (but
no more than 3 feet) from boiler connection tees.
— Boiler Manual
23