Part number 550-101-232/0703
12
GAS-FIRED WATER BOILER — Installation Manual — Multiple-boiler Systems
Figure 11 Typical piping for multiple Ultra boilers, using Weil-McLain Easy-Fit
®
Manifolds and heat exchanger
Use isolation heat
exchanger for:
1. Large volume systems with high
mineral content in water.
2. Systems exposed to untreated quan-
tities of makeup water.
3. Old systems severely contaminated
with scale and rust buildup inside
piping and heat distribution units.
4. Process applications.
5. Commercial service water applica-
tions.
6. High water pressure applications,
requiring pressure relief setting in
heating system more than 30 PSIG
(tall buildings). See notes below.
1 Flow/check valve (each boiler)
2 Isolation valves (when used)
3 Cap
4 Easy-Fit
®
Manifold (supply), sized per Fig. 6
or Fig. 7, page 8
5 Easy-Fit
®
Manifold (return), sized per Fig. 6
or Fig. 7, page 8
6a Heating system circulator (exchanger
tubeside)
6b Heat exchanger shellside circulator
7 Expansion tanks (diaphragm type)
8 System air eliminator
9 System automatic air vent
13 Cold water supply connections
17 Boiler circulator (each boiler)
18 Heating system supply
19 Heating system return
20 Boiler relief valve and discharge piping,
installed per Ultra Boiler Manual
Notes:
1. Contact heat exchanger manufacturer for
heat exchanger shellside and tubeside pip-
ing and circulator requirements. Tubeside
flow and temperatures must meet heating
system requirements.
2. Contact heat exchanger manufacturer for
sizing heat exchanger.
3. Heat exchanger shellside circuit requires
its own expansion tank as shown.
4. Heating system circuit requires its own ex-
pansion tank, as shown, plus its own re-
lief 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.
Easy-Fit
®
Piping (continued)
