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FIGURE 8.1: STANDARD RELIEF VALVE POSITION
FIGURE 8.3: STANDARD BOILER PIPING
5) Automatic Air Vent (Required) - At least one automatic air vent is required. Manual vents will usually be required in
other parts of the system to remove air during initial fill.
6) Low Water Cut-Off (Required in some situations) - A low water cutoff (LWCO) is required when the boiler is installed
above radiation. In addition, some codes such as ASME CSD-1 require low water cutoffs. Codes may also require that
this low water cutoff have a manual reset function. The low water cutoff may be a float type or probe type, but must be
designed for use in a hot-water system. The low water cutoff should be piped into the boiler supply just above the boiler
with no intervening valves between it and the boiler.
Crown LWCO kit PN 761000 is designed to be mounted in the boiler supply piping immediately adjacent to the boiler and
to plug directly into the factory low voltage wiring. If using a field supplied LWCO, use a LWCO that breaks the 120VAC
supply to the boiler. Do not attempt to wire a field-supplied 24VAC LWCO into the factory wiring.
FIGURE 8.2: ALTERNATE RELIEF VALVE POSITION
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