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IX. System Piping
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.
ASME Data Plate
Behind This Panel
Relief Valve
Split-Ring Clamp
(By Installer)
3/4" NPT x 30"
Nipple
1" NPT x 2-1/2"
Nipple
1" NPT Tee
Drain
Valve
3/4" NPT
107672-03 - 5/18
(continued)
Elbow
Figure 9.9: Factory Supplied Piping and Trim installation
1" NPT x 2" Nipple
1" NPT Side Outlet Tee
1" NPT x 1/4" NPT
Reducing Bushing
1" NPT x 3/4" NPT
Reducing Bushing
3/4" NPT x 4" Nipple
Threaded Rod
Mounting Plate
(By Installer)
Cut Threaded Rod
To Required Length
(By Installer)
Service Access Panel
Temp/Pressure
Gauge
71
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