Weil-McLain Eco Tec 2 Series Advanced Manual page 8

®
ECO Tec series 2 gas-fired water boiler – advanced manual
Multiple boiler installations
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 on the system piping for Easy-Fit® manifolds
as shown in Figure 6 or Figure 7. 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 6.
b. Use either tees (Figure 6) or crosses (Figure 7) 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 6 and Figure 7.
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 9, page 17 and Figure 11, page 21 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 6 and Figure 7 show details of Easy-Fit® manifolds.
b. Figure 8, page 9 is a schematic piping drawing showing
the locations of typical boiler piping and system piping,
including limits and other devices often required by lo-
cal codes.
c. Figure 8, page 14 and Figure 10, page 18 are three di-
mensional piping drawings of typical multiple boiler
installation.
d. Figure 12, page 22 shows recommend piping when an
isolating heat exchanger is needed.
If desired, other primary/secondary piping arrangements
can be used.
– 8 –
(continued)
Maximum connected load per manifold:
2-inch manifold —
3-inch manifold — 1400 MBH
4-inch manifold — 2900 MBH
Figure 6
Single-sided EZ-Fit Header connection
Figure 7
Double-sided EZ-Fit Header connection
450 MBH
Part number 550-100-272/1021