Nelson™ Heat Trace Type LT Domestic Hot Water Temperature Maintenance System

Nelson

Nelson™ Heat Trace Type LT Domestic Hot Water Temperature Maintenance System

Nelson

Nelson™ Heat Trace Type LT self-regulating heating cable is used in domestic hot water temperature maintenance systems. It is an energy-efficient and economical alternative to common recirculation systems. The heating cable is used to maintain water temperature in the supply piping system, reducing or eliminating the delay in obtaining hot water at each fixture. This cable system eliminates the need for return piping, pumps, check valves and pressure balancing valves found in recirculating systems. In addition, maintenance requirements are greatly reduced through the elimination of all devices with moving parts connected to the recirculating portion of the hot water supply system.

Specifications

Certifications and Compliances
UL Rated: Ordinary (Unclassified) Locations
Accessories
Connection kits, splice, end seals, thermostatic controls, junction boxes, tape, warning signs, monitoring and power panels, and custom controls are available. See catalog pages for details

Features

  • The standard product offering has been designed to maintain nominal domestic water temperatures of +105 °F, +115 °F, +125 °F and +140 °F. These representative hot water temperatures are in accordance with the ASHRAE Applications Handbook, Service Water Heating
  • The heating cables are UL Listed for domestic hot water temperature maintenance and meet all requirements of IEEE Standard 515.1, Recommended Practice for the Testing, Design, Installation, and Maintenance of Electrical Resistance Heat Tracing for Commercial Applications
  • Type LT self-regulating heater cable is a parallel circuit electric heater strip. An irradiation cross-linked conductive polymer core material is extruded over the multi-stranded, tin-plated, 16-gauge copper bus wires. The conductive core material increases or decreases its heat output in response to temperature changes. Two jackets provide extra dielectric strength, moisture resistance, and protection from impact and abrasion damage. The inner thermoplastic jacket is extruded over and bonded to the core material. A thermoplastic elastomer overjacket is then extruded over the inner jacket. A stranded tinned copper metal braid is supplied on all heaters. A color-coded modified polyolefin overjacket is supplied for positive identification during installation
  • Operating principle: the parallel bus wires apply voltage along the entire length of the heater cable. The conductive core provides an infinite number of parallel conductive paths permitting the cable to be cut to any length in the field with no dead or cold zones developing. The heater cable derives its self-regulating characteristic from the inherent properties of the conductive core material. As the core material temperature increases, the number of conductive paths in the core material decrease, automatically decreasing the heat output. As the temperature decreases, the number of conductive paths increase, causing the heat output to increase. This occurs at every point along the length of the cable, adjusting the power output to the varying conditions along the pipe. The self-regulating effect allows the cable to be overlapped without creating hot spots or burnout. As the cable self-regulates its heat output, it provides for the efficient use of electric power, producing heat only when and where it is needed

Documents & Drawings