User Guide

®
CONDENSING GAS BOILER — 70/110/155 Advanced Manual
Part number 550-100-193/0817
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Fast-Track Setup — Typical Application A
Figure 8 Typical Application A — Piping layout — typical piping for multiple Evergreen
®
boilers, using Weil-McLain
Easy-Fit manifolds (2-boiler system) (adjust boiler connections as required for other boiler models)
Legend — Figure 9
1 Flow/check or spring check valve.
2 Isolation valves (when used).
3 Caps.
4 Easy-Fit® Manifold (supply) — layout and size per page 7.
5 Easy-Fit® Manifold (return) — layout and size per page 7.
6 System circulator. (not used if system is circulator zoned)
7 Expansion tank (diaphragm type).
8 System air eliminator.
9 System automatic air vent.
12 Boiler drain valves.
13 Cold water supply (per applicable codes).
17 Boiler circulator — circulates water between boiler and
Easy-Fit® Manifolds.
18 System supply.
19 System return.
20 Boiler relief valve and discharge piping, installed per Evergreen
®
boiler manual.
21 Indirect-fired storage water heaters (Weil-McLain Aqua Plus Line shown) —
Example is shown connected to one boiler of the system. Setup is shown on the
next page for this configuration and also for the option of a DHW tank installed as
a system zone.
22 DHW boiler water supply, typical.
23 DHW boiler water return, typical.
24 DHW boiler-side circulator and flow/check valve.
25 Strap system supply and return sensors to lines as shown, at least 6 pipe diameters
(but no more than 3 feet) from boiler connection tees. For redundancy, you can
install a supply and return sensor connected to each boiler.
31 Unions.
34 Low water cutoff.
Suggested DHW
boiler-side pipe
sizing
(for max 0.04
feet head loss per foot of
total equivalent length,
TEL)
Flow rate Size Flow rate Size
1 – 3.9 gpm ¾ 24 – 45 gpm 2
3.9 – 7.1 gpm 1 45 – 75 gpm 2½
7.1 – 16 gpm 1¼ 75 - 140 gpm 3
16 – 24 gpm 1½ 140 – 290 gpm 4
See
Figure 9, page 16
for setting up
an alternate
configuration if
DHW is located
in the system as
a zone instead
of being directly
connected.
NOTICE:
This method does
not provided
DHW redundancy.
DHW can only
be supplied
when Boiler 2 is
operational.