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20
*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 Mod Con 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.
whl-445 Rev. 000 Rel. 014 Date 7.21.20
Figure 8 - Single Boiler Space Heating
Figure 9 - Cascaded Boilers Space Heating
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