Low Water Cutoff - ECR International CHB Application Manual

Low Water Cut Off - Heating Only and Combi Boilers
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 and dry contacts sized for load
being connected. Wire LWCO to boiler. See Page 34, LWCO
Wiring Diagram, Key 370.
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 page 35, LWCO 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 Page 36, LWCO Detail.
• 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.
OPTIONAL EQUIPMENT - LOW WATER CUTOFF
33
PN 240011074 REV C, [11/01/2017]