1-21
INSTALLATION
SFC COMBI BOILERS SFC-99, SFC-125
Figure 21: Relief Piping
System Piping
System piping is connected to the unit using the 3/4" NPT Male threaded ttings located
on the bottom of the unit. We recommend using unions and gate or ball valves at the
unit’s supply and return water connections to simplify servicing. Un-insulated hot water
pipes require a minimum 1/4" clearance from combustible materials.
Fluid ll is most often accomplished by using a regulator & ll valve set at 12 psig or more,
with appropriate backow prevention device as required by local code. This is acceptable
in areas where municipal water or well water has been treated and ltered to remove
excessive minerals and sediment, and water chemistry is known to be suitable for closed-
loop hydronic systems. When water quality is unknown, or when chemical treatment or
glycol is required, you should consider other options. Follow applicable Codes and good
piping practice.
Other feed and pressurization devices on the market today may be a better choice than a
raw water ll from the mains. When regular maintenance requires relief valve blow-off, the
discharge may be directed back into the pressurization unit for recycling of unit uid and
chemicals back into the system. In buildings that may be unoccupied for long periods of
time, pressurization units are useful to prevent ood damage should leakage occur from
any component in the system. An additional benet is that backow prevention devices
are not required when using these devices.
Do not place any water connections above the unit. Leaks can damage the fan and
controls. If needed, create a shield over the top of the cover, but allow clearance for
airow and service access.
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