U.S. Boiler Company K2, Installation Instructions Manual

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10) Drain Valve (required) – Install the drain valve supplied as shown in Figure 9.9.
11) Low Water Cut-off (may be required by local jurisdiction) – Protection of this boiler against low water and/or
inadequate flow is provided by the UL353 certified flow switch built into the boiler. This is a water tube boiler and
this flow switch is therefore the only effective way to provide such protection. Section HG614(c ) of the 2013
ASME boiler and Pressure Vessel Code recognizes the use of a listed flow switch in lieu of a low water cut-off on
water tube boilers.
In the event that a local jurisdiction insists upon the installation of a low water cut-off with this boiler, a Low Water
Cut-off Kit (P/N 105591-01) is available that plugs into the low voltage circuit board (refer to Section X and LWCO
Instruction Sheet for LWCO location and electrical connection). Install the low water cut-off in the supply piping at the
point prescribed the local jurisdiction (generally at a point above the boiler).
If a probe type low water cut-off is used, be certain that it is located at a point in the piping from which air can escape to an
automatic air vent. Generally, this means that there should be no down-turns in the piping between the low water cut-off and
the point where the automatic air vent is installed. Failure to do this may result in nuisance boiler shut-downs due to small
amounts of air trapped around the probe.
Figure 9.9: Factory Supplied Piping and Trim installation
IX. System Piping
(continued)