Today, there are a number of boiler feed and pressurization devices on the market that may
be a better choice than a raw water fill from the mains. When regular maintenance requires
relief valve blow-off, the discharge may be directed back into the pressurization appliance for
recycling of boiler fluid and chemicals back into the system.
In buildings that may be
unoccupied for long periods
of time, pressurization
appliances are useful to
prevent flood damage should
leakage occur from any
component in the system. An
additional benefit is that
backflow prevention devices
are not required when using
these devices.
Do not place any water
connections above the boiler
to avoid damage to the fan
and controls. If needed,
create a shield over the top of
the cover, but allow clearance for airflow and service access.
Heating supply and return
Auto air vent or flushing valve
Figure 34 Consideration for left-side only piping
Note that the supply pipe off the right-hand side of the heat exchanger carries the
LWCOdevice. If all heating loads are on the left-hand side only, ensure that the right-hand
supply connections use an auto air vent or a flushing valve.
Due to the various piping options available, positioning the pressure relief valve can vary.
When piping from either side, the relief valve is installed in the upper port opposite the supply
outlet, using the fittings provided.
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