45
LP- 428 REV. 9.2.14
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
A termination plug is included in the CAT 3 / CAT 5 Bus Connection Point, labeled J3 in Figure 27. DO NOT REMOVE THIS PLUG
UNLESS INSTRUCTED TO DO SO. Doing so will affect boiler operation and VOID WARRANTY.
1. A Cascade Bus Termination Plug has been installed on the customer connection board of this boiler. The purpose of this plug is to
stabilize communication between multiple boilers and reduce the effect of electrical “noise” on cascade bus communication. See
Figures 26 and 27 for Cascade Bus Termination Plug installation detail. You will need to remove and discard this plug in order to
connect the cable to the next boiler. DO NOT REMOVE the terminator unless you need to connect a cable to this port.
2. Use standard CAT3 or CAT5 computer network patch cables to connect the communication bus between each of the boilers. This
cable can be connected between any of the boilers in the system. The cable must be of the “straight through” design. For example, you
could connect the top boiler to the next top boiler. These cables are readily available at any office supply, computer, electronic,
department or discount home supply store in varying lengths. If you possess the skills you can also construct custom length cables.
3. 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 where they may 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.
4. Route the communication cables through one of the knockouts in the cabinet.
5. 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, there will be no open communication connection ports.
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