Williamson-Thermoflo GWC-070 Manual page 28

GWC -
gas fired water boiler
Multiple boiler water piping
Piping layout — typical for multiple GWC boilers, using isolation exchanger
Figure 35
1 Flow/check valve (each boiler)
2 Isolation valves (when used)
3 Cap
4 Secondary header (supply) — layout
and size per page 24
5 Secondary header (return) — layout
and size per page 24
6a Heating system circulator (exchang-
er tube-side)
6b Heat exchanger shell-side circulator
7 Expansion tanks (diaphragm type)
8 System air eliminator
28
— Boiler Manual
Legend — Figure 35
9 System automatic air vent
13 Cold water supply connections
16 Cold water fill line — see Fig-
ure 32, page 25 for typical compo-
nents
18 Heating system supply
19 Heating system return
20 Boiler relief valve and discharge pip-
ing, installed per GWC Boiler Manual
30 Sensor for BCP (boiler control
panel), when used
(continued)
1. Large volume systems with high
2. Systems exposed to untreated
3. Old systems severely contami-
4. Process applications.
5. Commercial service water ap-
6. High water pressure applications,
Notes:
1. Contact heat exchanger manufacturer for heat ex-
changer shell-side and tube-side piping and circulator
requirements. 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
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 components.
5. When individual isolation valves are used, individual
boiler and level controls may be required.
Part number 550-142-056/0411
Use isolation heat
exchanger for:
mineral content in water.
quantities of makeup water.
nated with scale and rust buildup
inside piping and heat distribu-
tion units.
plications.
requiring pressure relief setting
in heating system more than 50
PSIG (tall buildings). See notes
below.