36
YES
NO
NO
FIGURE 6-5 - Low Water Cutoff - Detail
6 - HYDRONIC PIPING
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
6.6 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 6-4.
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 6-3, 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 6-5.
• 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.
240013501 REV A [03/15/2022]
Summary of Contents for Dunkirk DCB-100
Page 2: ...DCC 205...
Page 4: ...DCB 165...
Page 79: ...75 A 2 MODEL 75 100 Heat Only APPENDIX A WIRING DIAGRAMS 240013501 REV A 03 15 2022...
Page 80: ...76 APPENDIX A WIRING DIAGRAMS A 2 MODEL 125 Heat Only 240013501 REV A 03 15 2022...
Page 81: ...77 APPENDIX A WIRING DIAGRAMS A 3 MODEL 165 Heat Only 240013501 REV A 03 15 2022...
Page 82: ...78 APPENDIX A WIRING DIAGRAMS A 1 MODEL 115 Combi 240013501 REV A 03 15 2022...
Page 83: ...79 APPENDIX A WIRING DIAGRAMS A 4 MODEL 150 Combi 240013501 REV A 03 15 2022...
Page 84: ...80 APPENDIX A WIRING DIAGRAMS A 5 MODEL 205 Combi 240013501 REV A 03 15 2022...
Page 85: ...81 NOTES 240013501 REV A 03 15 2022...
Page 86: ...82 NOTES 240013501 REV A 03 15 2022...
Page 121: ...33 PN 240011430 REV Q 03 15 2022 75 100 HEAT ONLY WIRING DIAGRAM MODEL 75 100 HEAT ONLY...
Page 122: ...34 PN 240011430 REV Q 03 15 2022 MODEL 125 HEAT ONLY 125 HEAT ONLY WIRING DIAGRAM...
Page 123: ...35 PN 240011430 REV Q 03 15 2022 MODEL 165 HEAT ONLY 165 HEAT ONLY WIRING DIAGRAM...
Page 124: ...36 PN 240011430 REV Q 03 15 2022 115 COMBI WIRING DIAGRAM MODEL 115 COMBI...
Page 125: ...37 PN 240011430 REV Q 03 15 2022 MODEL 150 COMBI 150 COMBI WIRING DIAGRAM...
Page 126: ...38 PN 240011430 REV Q 03 15 2022 MODEL 205 COMBI 205 COMBI WIRING DIAGRAM...
Page 132: ...44 PN 240011430 REV Q 03 15 2022 LOW WATER CUTOFF DETAIL LOW WATER CUTOFF NO NO YES...
Page 137: ...49 PN 240011430 REV Q 03 15 2022 3 FAULT SOLUTION SECTIONS...
