35
FIGURE 6-3 - Low Water Cutoff - Detail
6.6 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 6-3.
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 6-2, 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 6-3.
• Install an air vent using a tee to avoid nuisance
shutdowns.
• Apply small amount of pipe sealant to threaded
connections. Use LWCO manufacturer suggested
sealant.
• Arrange piping to prevent water dripping onto boiler.
•
DO NOT install water shutoff valve between boiler
and LWCO sensing device.
Low Water Cutoff (LWCO)
Electrical Conduit
J-Box
120 V/60 HZ
Conduit or Power
Supply cord
(Polarized)
L
1
N
G
GND
L
1
N
GND
BLK
WHT
120 V/60 HZ Socket
(Polarized) 120 V/60 HZ
Cord Set From Boiler
N.O
FIGURE 6-4 - LWCO Wiring Diagram
6 - HYDRONIC PIPING
YES
NO
NO
240013509 REV A, [03/15/2022]
Summary of Contents for Dunkirk DCBF
Page 2: ...DCCF 150...
Page 4: ...DCBF 125...
Page 38: ...34 FIGURE 6 2 Piping Diagram LWCO Location 6 HYDRONIC PIPING 240013509 REV A 03 15 2022...
Page 77: ...73 A 1 MODEL 75 100 Heat Only APPENDIX A WIRING DIAGRAMS 240013509 REV A 03 15 2022...
Page 78: ...74 A 2 MODEL 125 Heat Only APPENDIX A WIRING DIAGRAMS 240013509 REV A 03 15 2022...
Page 79: ...75 APPENDIX A WIRING DIAGRAMS A 3 MODEL 165 Heat Only 240013509 REV A 03 15 2022...
Page 80: ...76 APPENDIX A WIRING DIAGRAMS A 4 MODEL 115 Combi 240013509 REV A 03 15 2022...
Page 81: ...77 A 5 MODEL 150 Combi APPENDIX A WIRING DIAGRAMS 240013509 REV A 03 15 2022...
Page 82: ...78 A 6 MODEL 205 Combi APPENDIX A WIRING DIAGRAMS 240013509 REV A 03 15 2022...
Page 117: ...33 PN 240012875 REV D 03 15 2022 MODEL 75 100 HEAT ONLY 75 100 HEAT ONLY WIRING DIAGRAM...
Page 118: ...34 PN 240012875 REV D 03 15 2022 MODEL 125 HEAT ONLY 125 HEAT ONLY WIRING DIAGRAM...
Page 119: ...35 PN 240012875 REV D 03 15 2022 MODEL 165 HEAT ONLY 165 HEAT ONLY WIRING DIAGRAM...
Page 120: ...36 PN 240012875 REV D 03 15 2022 115 COMBI WIRING DIAGRAM MODEL 115 COMBI...
Page 121: ...37 PN 240012875 REV D 03 15 2022 MODEL 150 COMBI 150 COMBI WIRING DIAGRAM...
Page 122: ...38 PN 240012875 REV D 03 15 2022 MODEL 205 COMBI 205 COMBI WIRING DIAGRAM...
Page 128: ...44 PN 240012875 REV D 03 15 2022 LOW WATER CUTOFF LOW WATER CUTOFF DETAIL NO NO YES...
Page 133: ...49 PN 240012875 REV D 03 15 2022 3 FAULT SOLUTION SECTIONS...
