Weil-McLain Boiler Easy-Fit Piping, Easy-FitPiping installation, Single-sidedconnection

GAS-FIRED WATER BOILER — Installation Manual — Multiple-boiler Systems

Easy-Fit®Piping

Easy-Fit® Piping installation

1.Main header and Easy-Fit®Manifold pipe sizing.

a.New system:

Refer to Figure 1 on pages 4 and 5 for recommendations.

b.Replacing boilers in an existing system:

Without reducing size, connect system supply and return lines. Install tees or crosses for Easy-Fit®Manifolds as shown in Figure 6 or 7. Size manifolds to handle total connected boiler ouput as shown.

2.Provide connections in main header for Easy-Fit® Manifolds as close as possible to the midpoint of multiple boilers.

a.Use tees for four or less boilers, as in Figure 6.

b.Use either tees (Figure 6) or crosses (Figure 7) for five or more boil- ers.

3.Manifold placement:

a.To alternate spacing for supply and return lines to boilers, reverse the short-end and long-end of the Manifolds as shown in Figures 6 and 7.

b.Return Manifold must be on the return side of the main and Sup- ply Manifold must be on the supply side of the main. Drawings in this manual show flow in system main from right to left. For sys- tem flowing left to right, reverse the locations of the Manifolds accordingly.

4.Connect from Easy-Fit® Manifold branches to boiler supply and re- turn connections using 1¼" nominal copper tubing or steel pipe (maxi- mum run 15').

5.Provide a flow/check valve in the supply piping of each boiler as shown in piping diagrams in this manual. Install an isolation valve on the supply and return of each boiler as shown. Some local codes may re- quire the use of individual level controls and limits on each boiler when isolation valves are installed.

6.Install main system air eliminator and primary circulator in supply piping as shown in piping diagrams. Place expansion tank on suction side of system circulator as shown.

7.Install condensate drain line piping according to Ultra Boiler Manual. Condensate drain piping may be connected into a manifold before connection to a floor drain.

8.Install system accessories as shown in drawings.

9.For some applications, it may be necessary to install a heat exchanger as shown in Figure 11, page 12, to isolate the boilers from the system. See notes on page 12 for typical applications.

10.Piping recommendation drawings:

a.Figures 6 and 7 show details of Easy-Fit®Manifolds.

b.Figure 8 is a schematic piping drawing showing the locations of typi- cal boiler piping and system piping, including limits and other de- vices often required by local codes.

c.Figures 9 and 10 are three-dimensional piping drawings of typical multiple boiler installation.

d.Figure 11 shows recommended piping when an isolating heat ex- changer is needed.

11.If desired, other primary/secondary piping arrangements can be used.

Figure 6 Single-sided connection —

Maximum connected boiler output: 2-inch manifolds — 450 MBH

3-inch manifolds — 1400 MBH

4-inch manifolds — 2900 MBH

Figure 7 Double-sided connection —

Maximum boiler output (each side): 2-inch manifolds — 450 MBH

3-inch manifolds — 1400 MBH

4-inch manifolds — 2900 MBH

REVIEW & COMMENT ONLY

CONFIDENTIAL

06-24-03

8 Part number 550-101-232/0703