SECTION 15773
UNDERFLOOR ELECTRIC RADIANT HEATING CABLES

PART 1 GENERAL

1.1 SECTION INCLUDES

  1. Underfloor electric floor warming cables.
  1. Thermostats.
  1. Underfloor radiant heating components, accessories and installation material for a complete operating system.

1.2 RELATED SECTIONS

  1. Section 033000 - Cast-In-Place Concrete.
  1. Section 035300 - Concrete Topping: Installation coordination with concrete floor material and details.
  1. Section 096000 - Flooring: Installation coordination with specific floor materials and details.
  1. Section 260600 - Schedules for Electrical: Materials and installation of wiring and electrical power source.

1.3 REFERENCES

  1. National Electric Code (NEC).
  1. Canadian Standards Association (CSA).
  1. Underwriters Laboratories (UL).

1.4 SUBMITTALS

  1. Submit under provisions of Section 013000.
  1. Manufacturer's data sheets.
  1. Installation Instructions.

1.5 PROJECT RECORD DOCUMENTS

A.Accurately record locations of heating cable and thermostat sensor.

1.6 QUALITY ASSURANCE

  1. Manufacturer Qualifications:
  2. Minimum 45years of experience in design, engineering, manufacture and support of specified system and components.
  1. Product Requirements:
  2. All floor warming equipment furnished under this section shall be supplied by a single manufacturer.
  3. .Installation shall safely control and maintain heat energy compatible with floor material.
  4. Minimum 5 watts per linear foot.
  5. UL Listed heating cablesor CSA Certified heating cables.
  6. Mineral Insulated (MI) heating cable shall be factory assembled, immersed in water for a minimum of 12 hours, and then tested for insulation resistance, high potential breakdown and continuity before leaving the factory.
  7. Self-Regulating cable is not acceptable for this application.

1.7 DELIVERY, STORAGE, AND HANDLING

  1. Store products in manufacturer's unopened packaging until ready for installation.

1.8 PROJECT CONDITIONS

  1. Coordinate installation of heating cable or mat with Electrical Contractor and Flooring Contractor.
  1. Maintain environmental conditions (temperature, humidity, and ventilation) within limits recommended by manufacturer. Do not install products under environmental conditions outside manufacturer's limits.

PART 2 PRODUCTS

2.1 MANUFACTURERS

  1. System shall be manufactured by:

Delta-Therm Corporation,6711 Sands Rd Suite A, Crystal Lake, IL 60014,Phone: 800-526-7887,Fax: 847-526-4456,Email: , Web:

  1. Substitutions: No substitutions are permitted.

2.2 HEATING CABLE

  1. Mineral Insulated (MI) Heating Cable:
  2. UL listed and CSA Certified Mineral Insulated (MI), seamless sheathed series resistance heating cable.
  3. MI heating cable construction shall consist of MI copper sheath or MI stainless steel sheath, terminated in factory splice to stranded wire connection leads.
  4. MI heating cable construction shall consist of MI copper sheath and have a high density polyethylene jacketing (HDPE) to provide extra corrosion and mechanical protection.
  5. Connection leads shall be of sufficient length to reach junction boxes or power panel as shown on detailed drawings. Connection leads shall be of stranded wire. Only connection leads in conduit shall exit from heated zone.
  6. No combustible materials between conductor wire and ground sheath.
  7. Cross section of heated portion of cable not to exceed 0.4 inch (10 mm).
  8. Install cable in accordance with detailed layout drawings.
  9. Cable rating shall be:
  10. 120 VAC
  11. 208 VAC
  12. 240 VAC
  13. 277 VAC
  1. FW Cable,Silicone Jacketed Heating Resistance Cable:
  2. CSA Listed.
  3. Constant energy output.
  4. Resistance cable heater construction shall consist of high tensile strength stranded resistance wire encased in silicone rubber for insulation.
  5. Insulation shall be rated at 302°F and maximum cable power up to 8 watts/lf.
  6. Silicone insulation shall be surrounded by aluminum braid to provide ground path.
  7. Silicone over jacket shall be extruded over aluminum braid.
  8. End termination splice shall have nominal diameter of 0.475” inches or less.
  9. Install cable in accordance with detailed layout drawings.
  10. Cable rating shall be:
  11. 120 VAC
  12. 208 VAC
  13. 240 VAC
  14. 277 VAC
  1. Floor Warming Thermostat:
  2. “All-in-one” programmable thermostat with large back-lit display.
  3. In-floor sensor measures exact floor temperature.
  4. Built-in GFCI and capacity to switch a 15 amp load without the use of a contactor.
  5. Electronic control can be set to determine when the underfloor heating system should turn on to reach the desired floor temperature by a specified hour.
  6. Install the heating cable clipping into the ClipStrip cable strapping at the desired spacing.
  7. Thermostat rating shall be:
  8. 120VAC
  9. 208VAC
  10. 240VAC
  1. LNR, Low Noise Relay Panel:
  2. NEMA 1 enclosure one 2 pole power relay per circuits rated up to 24 amps and all UL recognized components.
  3. Model shall be:
  4. LNR-4 contains 2 relays for a total of 4 poles rated at 24A (resistive).
  5. LNR-8 contains 4 relays for a total of 8 poles rated at 24A (resistive).
  6. LNR-12 contains 6 relays for a total of 12 poles rated at 24A (resistive).
  7. LNR Panel rating shall be:
  8. 120 VAC
  9. 208 VAC
  10. 240 VAC
  11. 277 VAC

2.3 ACCESSORIES

  1. FW Cable clips:
  2. Floor Warming cable clips with screws.

PART 3 EXECUTION

3.1 EXAMINATION

  1. Installer to verify field measurements are as shown on Drawings.
  1. Installer to verify that required power is available, in proper location, and ready for use.
  1. Do not begin installation until substrates have been properly prepared.
  1. If substrate preparation is the responsibility of another installer, notify Architect of unsatisfactory preparation before proceeding.

3.2 PREPARATION

  1. Clean surfaces prior to installation.
  1. Prepare surfaces as recommended by the manufacturer.

3.3 INSTALLATION

  1. Complete installation shall conform to appropriate local codes.
  1. Install cable heaters in accordance with detailed layout drawings and manufacturer's instructions.
  1. Pull stranded connection leads through conduit from tee conduit body to junction boxes.
  1. Heating cable shall not leave heated area or cross expansion or construction joints.
  1. If heating cable is scheduled to cross over an expansion joint, use expansion joint kit provided by manufacturer.
  1. Install ClipStrip cable strapping at the wall edges perpendicular to the major direction the cable will be run. Fasten down the ClipStrip strapping with screws, nails or staples.
  1. Pull stranded connection leads through conduit to junction box or thermostat box.
  1. Heating cable shall not leave heated area.
  1. Run temperature sensor towards the center of the room in between two runs of heating cable.
  1. Determine location of thermostat or junction box where cold leads will be run for electrical connection. This location should be on a side where the cable will loop, not on a side parallel to the long run of the heating cable.
  1. Install the heating cable with cable clamps and screws at the desired spacing.

3.4 FIELD QUALITY CONTROL

  1. Test continuity of heating cable.
  1. Test total resistance (TR) using an ohmmeter. The ohmmeter reading should be within 10%of the calculated Total Resistance.
  1. Perform Insulation resistance (IR) or “Megger” test on each heating cable before, during and after installation. Insulation resistance should be greater than 10 megohms.
  1. Measure voltage and current at each unit after installation is complete.
  1. Submit written test report showing values measured on each test for each cable.

3.5 ADJUSTING AND CLEANING

  1. Adjust system controls and instruct Owner/Operator.

3.6 PROTECTION

  1. Protect installed products until completion of project.
  1. Repair or replace damaged products before Substantial Completion.

END OF SECTION

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