d. Steam boilers subject to UL726:
For installations subject to UL726, a second
operating control that senses steam pressure
is required (not provided). Use a PA404A or
equivalent. On probe boilers, install the additional
pressure control opposite the standard PA404A using
a cross instead of a tee along with a second brass
siphon (not provided). On float boilers, install the
additional pressure control in the location normally
used for the standard PA404A on steam-probe
boilers (fittings not provided).
3. For complete information on servicing and
adjustment of controls, refer to the attached control
specification sheets.
16
PIPING & CONTROLS
Figure 3.11: Assembling Float Low Water Cut-Off
Figure 3.12: Steam Boiler with Probe Low Water Cut-Off
To Next Page
Loading...