Weil-McLain WM97+100 Manual page 64

WM97+ Series 2
Multiple boiler installations
Piping layout — typical piping for multiple WM97+ boilers, using isolation exchanger (shown using
WM97+155 boilers — adjust boiler connections as required for other boiler models)
The illustration shows a
shell and tube exchanger.
Other exchanger types
may be used if suitable for
the system water condi-
tions.
Flow/check valve (integral to each
boiler internal circulator).
Isolation valves (when used).
Cap.
Easy-Fit® Manifold (supply) —
layout and size per page 60.
Easy-Fit® Manifold (return) —
layout and size per page 60.
Heating system circulator (ex-
changer tube-side).
Heat exchanger shell-side circulator
Expansion tanks (diaphragm type).
– 64 –
-
GAS FIRED WATER BOILER
piped as shown in this manual. This allows the boiler internal circulator to circulator water to and from the manifolds.
System air eliminator.
System automatic air vent.
Cold water supply connections.
Boiler circulator — circulates water
between boiler and Easy-Fit® Manifolds.
Heating system supply.
Heating system return.
Boiler relief valve and discharge piping,
installed per WM97+ Boiler Manual.
— Boiler Manual
(continued)
Notes:
1. Contact heat exchanger manufacturer for heat exchanger
shell-side and tube-side piping and circulator require-
ments. Tube-side flow 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 expan-
sion 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 components.
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 30
PSIG (tall buildings). See notes
below.
for multiple boiler installations
Part number 550-142-204/0117