DESIGN A/E NOTE - GUIDE SPECIFICATION CONVENTIONS

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Rev 19JUN09 j:\Projects\Active\com-deca_design_criteria_revisions-04071\Guide Specifications\TJG Innformation

SECTION 15535

REFRIGERANT PIPING AND SPECIALTIES FOR HVAC

PART 1 - GENERAL

1.1SUMMARY

1.1.1.Section Includes:

  1. Piping.
  2. Refrigerant.
  3. Flexible connections.

1.1.2.Related Sections:

  1. Section 01042 - Mechanical, Refrigeration, Food Service Equipment and Electrical Coordination.
  2. Section 01400 - Quality Control.
  3. Section 01720 – [Phased Turnover and] Project Closeout.
  4. Section 15140 - Supports and Anchors.
  5. Section 15240 - Vibration Isolation and Seismic Restraints.
  6. Section 15260 Piping Insulation for HVAC and Plumbing.
  7. Section 15935 - Building HVAC Systems Controls.
  8. Division 16 – Electrical.

1.2QUALITY CONTROL

1.2.1.The following publications form a part of this specification to the extent they are applicable:

  1. Section 01400 – Quality Control.
  2. ARI 710 Liquid Line Dryers.
  3. ARI 730 FlowCapacity Rating and Application of SuctionLine Filters and FilterDriers
  4. ASHRAE 15 Safety Code for Mechanical Refrigeration.
  5. ASHRAE 34 Number Designation of Refrigerants.
  6. ASME B16.22 Wrought Copper and Copper Alloy Solder Joint Pressure Fittings.
  7. ASME B16.26 Cast Copper Alloy Fittings For Flared Copper Tubes.
  8. ASME B31.5 Refrigeration Piping.
  9. ASME B31.9 Building Services Piping.
  10. ASTM B88 Seamless Copper Water Tube.
  11. ASTM B280 Seamless Copper Tube for Air Conditioning and Refrigeration Field Service.
  12. ASTM F708 Design and Installation of Rigid Pipe Hangers.
  13. AWS A5.8 Brazing Filler Metal.
  14. MSS SP58 Pipe Hangers and Supports Materials, Design and Manufacturer.
  15. MSS SP69 Pipe Hangers and Supports Selection and Application.
  16. MSS SP89 Pipe Hangers and Supports Fabrication and Installation Practices.

1.3SUBMITTALS

1.3.1.Submittals for Review:

  1. Submit under provisions of Section 01400.
  2. Shop Drawings: Indicate schematic layout of system, including equipment, critical dimensions, and sizes developed by the Condensing Unit Manufacturer.
  3. Operation and Maintenance Data.

1.3.2.Submittals At Project Closeout:

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  1. Section 01720 – [Phase Turnover] and Contract Closeout.
  2. Project Record Documents: Record actual locations of components.
  3. Operation and Maintenance Data: Include operation, maintenance, and inspection data, replacement part numbers and availability, and service depot location and telephone number.
  4. Warranty: Submit compressor manufacturer warranty and ensure forms have been completed in Owner's name and registered with manufacturer.
  5. The Contractor shall submit all certifications and testing data as a supplement to previously submitted O & M manuals at contract closeout.

1.4DELIVERY, STORAGE, AND HANDLING

  1. Deliver and store piping and specialties in shipping containers with labeling in place.
  2. Protect piping and specialties from entry of contaminating material by leaving end caps and plugs in place until installation.
  3. Dehydrate and charge components such as piping and receivers, seal prior to shipment, until connected into system.

1.5QUALIFICATIONS

  1. Installer: Company specializing in performing the work of this section with minimum three years documented experience.
  2. Design piping system under direct supervision of a Professional Engineer experienced in design of this work, licensed in one of the states of the United States of America, and employed or approved by the manufacturer of the equipment.

1.6REGULATORY REQUIREMENTS

  1. Conform to IMC ASME B31.9 for installation of piping system.
  2. Products Requiring Electrical Connection: Listed and classified by UL, as suitable for the purpose indicated.

PART 2 - PRODUCTS

2.1PIPING

  1. Copper Tubing: ASTM B280, Type ACR hard drawn

(1)Fittings: ASME B16.22 wrought copper.

(2)Joints: Braze, AWS A5.8 BCuP silver/phosphorus/copper alloy with melting range 1190 to 1480 degrees F (640 to 805 degrees C).

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  1. Copper Tubing to 7/8 inch (22 mm) OD: ASTM B88, Type K, annealed.

(1)Fittings: ASME B16.26 cast copper.

(2)Joints: Flared.

  1. Pipe Supports and Anchors:

(1)See Section 15140.

2.2REFRIGERANT

  1. Refrigerant: ASHRAE 34:

(1)R-410A.

2.3FLEXIBLE CONNECTORS

  1. Corrugated stainless steel hose with single layer of stainless steel exterior braiding, minimum 9 inches (230 mm) long with copper tube ends; for maximum working pressure 500 psig (3450 kPa).

2.4DRAIN PIPING

  1. Type DWV copper with wrought, copper fittings.

PART 3 - EXECUTION

3.1SYSTEM DESCRIPTION

  1. Where more than one piping system material is specified ensure system components are compatible and joined to ensure the integrity of the system is not jeopardized. Provide necessary joining fittings. Ensure flanges, union, and couplings for servicing are consistently provided.
  2. Provide pipe hangers and supports in accordance with MSS SP69 unless indicated otherwise.
  3. Solenoid Valves:

(1)Use in liquid line of systems operating with single pumpout or pumpdown compressor control.

(2)Use in liquid line of single or multiple evaporator systems.

(3)Use in oil bleeder lines from flooded evaporators to stop flow of oil and refrigerant into the suction line when system shuts down.

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  1. Flexible Connectors: Utilize at or near condensing units or coils in resiliently mounted equipment where piping configuration does not absorb vibration.

3.2DRAIN PIPING

  1. Install a trapped drain in to the nearest floor drain for each cooling coil. Pipe size shall be full drain pan outlet size.

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3.3FIELD QUALITY CONTROL

  1. Pressure test system with dry nitrogen to 200 psig (1470 kPa). Perform final tests at 27 inches (92 kPa) vacuum and 200 psig (1470) kPa) using electronic leak detector. Test to no leakage.

3.4PREPARATION

  1. Ream pipe and tube ends. Remove burrs.
  2. Remove scale and dirt on inside and outside before assembly.
  3. Prepare piping connections to equipment with flanges or unions.

3.5INSTALLATION

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  1. Install refrigeration specialties in accordance with manufacturer's instructions.
  2. Route piping in orderly manner, with plumbing parallel to building structure, and maintain gradient.
  3. Install piping to conserve building space and not interfere with use of space.
  4. Group piping whenever practical at common elevations and locations. Slope piping 1-inch per 20 ft. in direction of oil return.
  5. Install piping to allow for expansion and contraction without stressing pipe, joints, or connected equipment.
  6. Inserts: See Section 15140.
  7. Pipe Hangers and Supports: See Section 15140.
  8. Arrange piping to return oil to compressor. Provide traps and loops in piping, and provide double risers as required.
  9. Provide clearance for installation of insulation and access to valves and fittings.
  10. Continuously purge piping system with nitrogen when brazing.
  11. Where pipe support members are welded to structural building frame, brush clean, and apply one coat of zinc rich primer to welding.
  12. Insulate piping; refer to Section 15260. .
  13. Follow ASHRAE 15 procedures for charging and purging of systems and for disposal of refrigerant.
  14. Locate expansion valve sensing bulb immediately downstream of evaporator on suction line.
  15. Provide external equalizer piping on expansion valves with refrigerant distributor connected to evaporator.
  16. Install flexible connectors at right angles to axial movement of compressor, parallel to crankshaft.
  17. Fully charge completed system with refrigerant after testing.
  18. Provide electrical connection to solenoid valves. .

END OF SECTION

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