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Part number 550-100-214/1220
– 22 –
CONDENSING GAS BOILER — 110/155 Advanced Manual
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Fast-Track Setup — Typical Application C
Figure 12
Typical Application C —
Piping layout — typical piping for multiple
Evergreen
®
boilers, using isolation
exchanger (adjust boiler connections as required for other boiler models)
Legend — Figure 12
1 Flow/check or spring check valve.
2 Isolation valves (when used).
3 Cap.
4 Easy-Fit® Manifold (supply) — layout
and size per page 7 .
5 Easy-Fit® Manifold (return) — layout
and size per page 7 .
6a Heating system circulator
(exchanger tube-side).
6b Heat exchanger shell-side circulator
7 Expansion tanks (diaphragm type).
8 System air eliminator.
9 System automatic air vent.
12 Boiler drain valves.
13 Cold water supply connections (per applicable
codes).
17 Boiler circulator — circulates water between
boiler and Easy-Fit® Manifolds.
18 Heating system supply.
19 Heating system return.
20 Boiler relief valve and discharge piping,
installed per Evergreen
®
boiler manual.
21 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 multiple sensors, each
connected to a different boiler.
31 Unions.
34 Low water cutoff.
Notes:
1. Contact heat exchanger manufacturer for heat ex-
changer shell-side and tube-side piping and circulator
requirements. Tube-side fl ow and temperatures must
meet heating system requirements.
2. Contact heat exchanger manufacturer for sizing heat
exchanger.
3. Heat exchanger shell-side circuit requires its own
expansion tank as shown.
4. Heating system circuit requires its own expansion
tank, as shown, plus its own relief valve set to protect
heating system and heat exchanger piping and com-
ponents.
5. When individual isolation valves are used, individual
boiler and level controls may be required.
Use isolation heat
exchanger for:
1. Large volume systems with high
mineral content in water.
2. Systems exposed to untreated
quantities of makeup water.
3. Old systems severely contami-
nated with scale and rust buildup
inside piping and heat distribu-
tion units.
4. Process applications.
5. Commercial service water ap-
plications.
6. High water pressure applications,
requiring pressure relief setting
in heating system more than 80
PSIG (tall buildings). See notes
below.
Heat exchanger type — This illustration shows a shell
and tube exchanger. Other exchanger types may be used if
suitable for the system water conditions.
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