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O. Applications*
*NOTE: Systems shown are
primary/secondary
piping
systems. These recommended
systems have a primary (boiler)
loop, and secondary circuits
for heating. The primary loop
and secondary circuits have
separate circulators. The use
of other near boiler piping
configurations could result in
improper flow rates, leading
to inadvertent boiler high limit
shutdowns and poor system
performance.
NOTE: In piping applications
utilizing a single zone, it is
recommended that the installer
use flow / check valves with
weighted seats at or near the
appliance to prevent gravity
circulation.
FIGURE NOTES:
1. This drawing is meant to
demonstrate
system
piping
concept only.
2. A mixing valve is recommended
if the DHW temperature is set
above the factory setting of 119
3. Install a minimum of 12
diameters
of
straight
upstream of all circulators.
4. Install a minimum of 6 diameters
of straight pipe up and downstream
of all closely spaced tees.
5. Piping shown is Primary/
Secondary.
6. The minimum pipe size for
connecting
a
Westinghouse
indirect fired water heater is 1".
7. The minimum pipe size for
connecting a 750 boiler is 2". The
minimum pipe size for connecting
a 1000 boiler is 2 1/2".
8. System flow (Secondary Loop)
must be greater than the boiler's
Primary Loop flow.
9. Installations must comply with
all local codes.
10. In Massachusetts, a vacuum
relief valve must be installed on
the cold water line per 248 CMR.
11. See Multiple Boiler Manifold
Piping chart, this manual, when
sizing and installing a multiple
boiler system.
An ASSE 1017 thermostatic mixing valve is recommended on all indirect water heaters if the hot water temperature leaving the
o
heater is above 119
F. Failure to do so could result in substantial property damage, serious injury, or death.
The piping will not support the weight of the circulators. Refer to the circulator manufacturer's instructions to properly support
the circulator. Failure to comply with these instructions could result in property damage, severe personal injury, or death.
Figure 7 - Single Boiler Space Heating with Indirect Priority
o
F.
pipe
Figure 8 - Cascaded Boilers with Indirect Priority on One
21
WHL-038 Rev. 1.29.16
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