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connected to the low water cut-off probe on the boiler and connect it to the orange wire from the newly
mounted LWCO control box.
3. Connect the single red wire from the control box to the low water cut-off probe on the boiler.
4. Route the rest of the wires through the hole provided in the cabinet and down by the main electrical
enclosure.
5. Locate the two pigtails hanging from the main electrical enclosure. Select the pigtail which has a white,
red, and brown wire in it. If the pigtail is connected to a gas pressure switch, skip to step 7. If this pigtail is
not connected to a gas pressure switch, remove the jumper plug from the end of the pigtail and place the
jumper plug into the mating connector coming from the LWCO control box.
6. Connect the pigtail to the remaining plug coming from the LWCO control box. Installation is complete.
7. If the pigtail located in step 5 is connected to a gas pressure switch, disconnect it from the gas
pressure switch and connect the pigtail to the mating connector coming from the LWCO control box.
Connect the gas pressure switch to the remaining connector from the LWCO control box.
N. WIRING OF THE CASCADE SYSTEM COMMUNICATION BUS
1. Use standard CAT3 or CAT5 computer network patch cables to connect the communication bus
between each of the boilers. Use standard ‘straight through’ cables for these connections. These cables
are readily available at any office supply, computer, electronic, department, or discount home supply
store in varying lengths. DO NOT use crossover cables.
2. It is recommended to use the shortest length cable that will reach between the boilers and create a
neat installation. Do not run unprotected cables across the floor or where they will become wet or
damaged. Avoid running communication cables parallel and close to or against high voltage (120 volt or
greater) wiring. HTP recommends that the maximum length of communication bus cables not exceed 200
feet.
3. Route the communication cables through one of the knockouts in the cabinet.
4. Connect the boilers in a daisy chain configuration as shown below. It is best to wire the boilers using
the shortest wire runs rather than trying to wire them in the order that they are addressed. The
communication bus jacks on the customer connection panel are interchangeable so you can use either
one or both in any order to connect the cable. If you have connected the boilers to each other properly,
two of the boilers will have one open connection port each.
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