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5.6 External Optional Low Water Cut Off
These guidelines are supplied when necessary to install an additional Low Water Cut Off (LWCO), for sensing a low water level
condition in a boiler, as required by the Authority Having Jurisdiction.
Follow LWCO manufacturer installation instructions for type of LWCO selected in addition to these instructions.
LWCO shall be 120V/60HZ control and dry contacts sized for load being connected. Wire control to boiler. See Figure 5-3.
Connect LWCO device to the system ground. Ground in accordance with the requirements of the authority having jurisdiction or, in
the absence of such requirements, with the National Electrical Code (NEC) or Canadian Electrical Code CEC.
• Locate LWCO sensing device in the supply piping, above the minimum height of boiler. See Figure 5-2, Piping Diagram.
• Position control in HORIZONTAL piping to assure proper boiler protection (upright or 90° rotation).
• For proper operation, sensing element of the LWCO control shall be positioned in the tee to sense the main water stream.
Maintain minimum 1/4" spacing from pipe walls. Element shall NOT contact the rear, or side walls of the tee. See Figure 5-4.
• Install an air vent using a tee to avoid nuisance shutdowns.
• Apply small amount of pipe sealant to threaded connections.
• Arrange piping to prevent water dripping onto boiler.
• DO NOT install water shutoff valve between boiler and LWCO sensing device.
FIGURE 5-3 - LWCO Wiring Diagram
120 V/60 HZ
L
1
N
G
Conduit or Power
Supply cord
(Polarized)
FIGURE 5-4 - Low Water Cutoff - Detail
240012485 REV C [06/30/2019]
Electrical Conduit
J-Box
BLK
WHT
GND
Low Water Cutoff (LWCO)
L
1
N
GND
120 V/60 HZ Socket
NO
NO
YES
18
N.O
(Polarized) 120 V/60 HZ
Cord Set From Boiler
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