Installation Guide
Part number 550-100-066/0608
g a s -f i r e d w at e r b o i l e r — Boiler Manual
24
Multiple boiler water piping
Easy-Fit® piping installation
Main header and Easy-Fit1.
®
Manifold pipe sizing.
New system — a. See page 15.
Replacing boilers in an existing system — b. Without reducing
size, connect system supply and return lines. Install tees or
crosses for Easy-Fit
®
manifolds as shown in Figure 24 or Fig-
ure 25. Size manifolds to handle total connected boiler output
as shown.
Provide connections in main header for Easy-Fit® manifolds as 2.
close as possible to the midpoint of multiple boilers.
Use tees for four or less boilers, as in a. Figure 24.
Use either tees (b. Figure 24) or crosses (Figure 25) for five or
more boilers.
Manifold placement:3.
To alternate spacing for supply and return lines to boilers, a.
reverse the short-end and long-end of the manifolds as shown
in Figure 24 and Figure 25.
Return manifold must be on the return side of the main and b.
supply manifold must be on the supply side of the main. Draw-
ings in this manual show ow in system main from right to
left. For system owing left to right, reverse the locations of
the manifolds accordingly.
Connect from Easy-Fit® manifold branches to boiler supply and 4.
return connections using copper or steel pipe, sized for the required
ow rate. See page 15 for information.
Provide a ow/check valve in the supply piping of each boiler as 5.
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 require the use of individual water level controls and limits
on each boiler when isolation valves are installed.
Install main system air eliminator and primary circulator in sup-6.
ply piping as shown in piping diagrams. Place expansion tank on
suction side of system circulator as shown.
Install system accessories as shown in drawings.7.
Piping recommendation drawings:8.
a. Figure 24 and Figure 25 show details of Easy-Fit
®
manifolds.
b. Figure 26, page 25 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 27, page 26 and Figure 28, page 27 are three-dimensional
piping drawings of typical multiple boiler installation.
d. Figure 29, page 28 shows recommended piping when an isolat-
ing heat exchanger is needed.
If desired, other primary/secondary piping arrangements can be 9.
used.
When using isolation valves on each boiler, some codes
may require providing a low water control and additional
limit for each boiler. Consult local codes to determine
if omission of the individual boiler isolation valves
may allow the use of a single water level control and
additional limit for the entire multiple boiler system.
. This will satisfy some code requirements for
low water cutoff protection.
Single-sided EZ-Fit Header connection
Double-sided EZ-Fit Header connection