Instructions / Assembly

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2. Use standard CAT3 or CAT5 computer network patch cables to connect the communication bus between each of the boilers. 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.
Figure 33 – Cascade Resistor Plug Installation Detail
M. CASCADE MASTER PUMP AND SENSOR WIRING
1. Connect the system pump hot wire to the terminal marked 8.
2. Connect the system pump neutral to the 2 terminal and the pump ground wire to the 3 terminal.
3. Connect a jumper wire from the 120 VOLT terminal to the 9 terminal.
Figure 32 – LP-387-W