Weil-McLain WM97+70 Specifications download pdf (Page 57)

Part number 550-142-120/0113

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WM97+ gas-fired water boiler — Boiler Manual

Sequencing multiple WM97+ boilers

1. Use a multiple-boiler controller, such as the Weil-McLain BCP,

BMC or BSC, to sequence boilers. Locate temperature sensors as

required in the controller manual.

Easy-Fit® piping installation

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

a. Size system piping as required for the ﬂow.

b. Install tees or crosses in the system piping for Easy-Fit® mani-

folds as shown in Figure 65 or Figure 66. Size manifolds to

handle total connected boiler output 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 65.

b. Use either tees (Figure 65) or crosses (Figure 66) for ﬁve or

more boilers.

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 Figure 65 and Figure 66.

b. Return manifold must be on the return side of the main and

supply manifold must be on the supply side of the main. Draw-

ings in this manual show ﬂow in system main from right to

left. For system ﬂowing left to right, reverse the locations of

the manifolds accordingly.

4. Connect from Easy-Fit® manifold branches to boiler supply and

return connections using copper or steel pipe, sized for the required

ﬂow rate.

5. Install an isolation valve on the supply and return of each boiler

as shown in the piping diagrams in this manual. Some local codes

may require the use of individual water level controls and limits

on each boiler because isolation valves are installed.

6. Install main system air eliminator and primary circulator in sup-

ply piping as shown in piping diagrams. Place expansion tank on

suction side of system circulator as shown.

7. Install system accessories as shown in drawings.

8. Piping recommendation drawings:

a. Figure 65 and Figure 66 show details of Easy-Fit® manifolds.

b. Figure 67, page 58 is a schematic piping drawing showing the

locations of typical boiler piping and system piping, including

limits and other devices often required by local codes.

c. Figure 68, page 59 and Figure 69, page 60 are three-dimensional

piping drawings of typical multiple boiler installation.

d. Figure 70, page 61 shows recommended piping when an isolat-

ing heat exchanger is needed.

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

used.

The boiler internal primary/secondary by-pass valve

must be CLOSED

for multiple boiler installations piped

as shown in this manual. This allows the boiler internal

circulator to circulator water to and from the manifolds.

Maximum connected load per manifold:

2-inch manifold — 450 MBH

3-inch manifold — 1400 MBH

4-inch manifold — 2900 MBH

Figure 65 Single-sided EZ-Fit Header connection

Figure 66 Double-sided EZ-Fit Header connection

Multiple boiler installations

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Weil-McLain WM97+70 Specifications Page 57

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