Rev_for_section_2.3.8_water_connection_to_include_specific_heat_trace_29Aug2015.pdf

2.3.9. Water Connection Hose

2.3.9.1. The water connection between the TPS and the MHU shall be made of cross-linked polyethylene (PEX) tubing approved for use in NFPA 13D sprinkler systems.

2.3.9.2. The water connection and water line shall be 1½ inches in diameter.

2.3.9.3. The water connection hose ends shall be identified as either the TPS end or the MHU end.

2.3.9.4. The water connection and water line shall be protected by 240V approved self-regulating heat-trace.

The heat-tracing shall be specifically “Listed” by a nationally accredited testing laboratory (e.g., Underwriters Laboratory – UL) for use on sprinkler systems. Examples of acceptable heat-trace are: Thermon FLX™ Self- Regulating heat-trace or Raychem® XL-Trace self-regulating heating cable that it will be compatible with the Raychem® heat trace cable supplied with the MHU on the sprinkler riser. or equal. If the contractor chooses not to use one of these heat-trace products the contractor shall provide documentation that the substitute is an approved alternate product Listed by a nationally accredited testing laboratory.

2.3.9.5. Heat-trace shall be installed in compliance with the manufacturer’s installation manual. The TPS shall provide an additional two feet of heat trace cable beyond the end of the water line. The TPS shall provide an additional two feet of listed heat trace beyond the junction. Heat trace at the MHU end of the water line shall be delivered with an end seal kit installed. At the final installation site, the end seal will be removed, and the heat trace in the TPS/water connection line will be connected to the Raychem heat trace on the sprinkler riser using a RayClic-S Splice Kit. The heat trace on the sprinkler riser shall be not more than 36 inches in length for design calculations in the TPS.

2.3.9.6. Water line insulation shall be closed cell foam insulation. Water line insulation shall be flexible to permit water connection hose to be installed as intended. Turning radius of the hose assembly shall not be greater than 12 inches to permit installation underneath the MHU. Closed cell foam insulation is one way to achieve this. Thickness of the insulation shall be determined by calculations based on the design temperature stated herein. The MHU manufacturer shall provide a closed cell foam line flange cover to insulate the union that joins the MHU sprinkler system to the TPS. This will be installed after the water line connection to the TPS is complete at the final installation site.

2.3.9.7. TPS install kit

2.3.9.7.1. The TPS installation kit shall include all material required to install and seal the closed cell foam insulation and to connect the TPS heat trace system to the heat trace on the MHU sprinkler riser so that they perform as a single system.

2.3.9.7.2. Closed cell foam insulation shall be provided with the TPS. The closed cell foam insulation shall be part of the water connection freeze protection when installed in combination with the heat-trace. The contractor shall ensure that the closed cell foam insulation is packaged for transportation with the TPS. 5

2.3.9.7.3. Sprinkler riser in the MHU will come from the factory with Raychem® XL-Trace® _5XL2-CR self-regulating heating cable. Provide two Raychem® RayClic-S Splice Kits that will be used to connect the TPS heat trace system to the XL-Trace cable on the sprinkler riser.