Weil-McLain SlimFit Manual page 24

SlimFit
™
commercial condensing gas
Multiple boiler water piping
Figure 22
Piping layout — typical piping for multiple SlimFit boilers, using multiple boiler manifolds
• Use 3" or larger piping for all
connections between boilers and
manifolds.
1 Check valve (each boiler)
2 Isolation valves
3 Strainer (recommended on return line to each boiler)
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 shown)
8 System air eliminator
9 System automatic air vent
24
-
fired water boiler
(continued)
• Follow all sizing guidelines on
page 15. Pumps must provide
flow rates required.
Legend — Figure 22
13 Cold water supply (requires items 10, 11 and 12 as shown in Figure 21,
page 23)
17 Boiler pump (each boiler)
18 System supply
19 System return
20 Boiler relief valve and discharge piping (not shown) — install per page 14
and all applicable codes
25 External drain/blowdown valve, when used, ¾" NPT or larger
30 System supply sensor — strap to piping as shown, at least 6 pipe diameters
(but no more than 3 feet) from boiler connection tees.
36 Secondary connection to boiler manifolds — space no greater than 8 pipe
diameters apart
— Boiler Manual
• Use recognized engineering
design practices throughout.
Part number 550-100-116/0713