Ul353 Low Water Cut-Off Interface Kit; Wiring Of Cascade System Communication Bus - Pioneer PHR100-55 Instruction Manual

H. UL353 LOW WATER CUT-OFF INTERFACE KIT (OPTIONAL)
1. If an HTP 7450P-255 UL353 Low Water Cut-Off (LWCO) Interface Kit is not used, move on to Section
I.
2. The control box of the kit should be mounted to the left side of the heater near the low water cut-off
probe, which is located near the outlet nipple of the heater.
3. Follow the complete instructions included in the kit for proper installation.
I. WIRING OF CASCADE SYSTEM COMMUNICATION BUS
1. Use standard CAT3 or CAT5 computer network patch cables to connect the communication bus
between each of the heaters. 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.
2. It is recommended to use the shortest length cable that will reach between the heaters 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.
3. Route the communication cables through one of the knockouts in the cabinet.
4. Connect the heaters in a daisy chain configuration. It is best to wire the heaters 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 heaters to each other properly (see Figure 7 – Cascaded
System, p. 25), two of the heaters will have single open connection ports.
Figure 19
44