Weil-McLain Series 2 Manual page 55

® S
ERIES
Multiple boiler installations
Sequencing multiple ECO 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®
manifolds as shown in Figure 61 or Figure 62. 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 61.
b. Use either tees (Figure 61) or crosses (Figure 62) 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 61 and Figure 62.
b. Return manifold must be on the return side of the main and
supply manifold must be on the supply side of the main.
Drawings 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.
It is recommended to pipe to boilers such that the first
boiler connection off the return manifold is piped
to the furthest connection on the supply manifold
from the main header. See Figure 63, page 56 and
Figure 64, page 57 for example.
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 supply
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 61 and Figure 62 show details of Easy-Fit® manifolds.
b. Figure 63, page 56 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.
9. If desired, other primary/secondary piping arrangements can be
used.
Part number 550-142-190/1218
2
-
G
AS FIRED WATER BOILER
— Boiler Manual
(continued)
Maximum connected load per manifold:
2-inch manifold — 450 MBH
3-inch manifold — 1400 MBH
4-inch manifold — 2900 MBH
Figure 61
Single-sided EZ-Fit Header connection
Figure 62 Double-sided EZ-Fit Header connection
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