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*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. Install a minimum of 12
diameters of straight pipe
upstream of all circulators.
3. Install a minimum of 6
diameters of straight pipe up
and downstream of all closely
spaced tees.
4. Piping shown is Primary/
Secondary.
5. The minimum pipe size for
connecting a boiler is 2".
6. System flow (Secondary
Loop) must be greater than the
boiler's Primary Loop flow.
7. Installations must comply
with all local codes.
8. See Multiple Boiler Manifold
Piping chart, this manual, when
sizing and installing a multiple
boiler system.
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 8 - Single Boiler Space Heating
Figure 9 - Cascaded Boilers Space Heating
21
WHL-033 Rev. 1.29.16
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