MPS Master
SECTION 23 23 00
REFRIGERANT PIPING
PART 1 - GENERAL
1.01 SUMMARY
A.Section Includes: Include labor, materials, equipment, and accessories necessary to furnish and install refrigerant piping and specialties, including piping, refrigerant, moisture and liquid indicators, valves, strainers, check valves, pressure relief valves, filter dryers, solenoid valves, expansion valves, and flexible connections.
B.Description of Work:
1.Extent of refrigeration piping system work is indicated on Drawings and Schedules, and by requirements of this Section.
1.02 QUALITY ASSURANCE
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A.Codes and Standards:
1.ANSI Compliance: Fabricate and install refrigerant piping in accordance with ANSI B31.5, Refrigerant Piping, to include systems operating below pressure of 15psi.
2.ASHRAE Compliance: Fabricate and install refrigerant piping in accordance with ASHRAE 15, Safety Code for Mechanical Refrigeration
B.Regulatory Requirements:
1.StateBuilding Code
2.National Electric Code
3.Plumbing Code
4.Local Codes and Ordinances
1.03 SUBMITTALS
A.System Design: Submit line diagrams of refrigerant piping systems, indicating pipe sizes, lengths, and valve assemblies and sizes for approval by Architect/Engineer.
B.Tests: Submit test reports indicating results of leak test and acid test.
1.04 PROJECT RECORD DOCUMENTS
A.Record Drawings: Contractor shall accurately record exact locations of equipment and refrigeration accessories on Record Drawings.
1.05 DELIVERY, STORAGE, AND HANDLING
A.Piping and Specialties: Deliver and store piping and specialties in shipping containers with labeling in place.
B.Protection: Protect piping and specialties from entry of contaminating material by leaving end caps and plugs in place until installation.
PART 2 - PRODUCTS
2.01 MANUFACTURERS
A.Acceptable Manufacturers for Refrigerant Valves: Subject to compliance with requirements of the Contract Documents, acceptable manufacturers are as follows:
1.Parker Hannifin Corporation, Refrigeration and Air-Conditioning Division
2.Sporlan Valve Company
B.Acceptable Manufacturers for Solenoid Valves: Subject to compliance with requirements of the Contract Documents, acceptable manufacturers are as follows:
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1.Emerson Electric Company, Alco Controls Division
2.Sporlan Valve Company
C.Acceptable Manufacturers for Refrigerant Specialities: Subject to compliance with requirements of the Contract Documents, acceptable manufacturers are as follows:
1.Emerson Electric Company, Alco Controls Division
2.Parker-Hannifin Corporation, Refrigeration and AirConditioning Division
3.Sporlan Valve Company
2.02 MATERIALS AND PRODUCTS
A.General Requirements: Provide piping materials and factory fabricated piping products of sizes types, pressure ratings, temperature ratings, and capacities as indicated. Where not indicated, provide proper selection as determined by installer in accordance with installation requirements. Provide materials and products in accordance with ANSI B31.5, Code for Refrigeration Piping, where applicable, base pressure rating on refrigeration piping system maximum design pressures. Provide sizes and types matching piping and equipment connections; provide fittings of materials that match pipe materials used in refrigeration piping systems. Where more than one type of materials or products are indicated, selection is installer’s option.
2.03 COPPER TUBE AND FITTINGS
A.Copper Tube: ASTM B280, Type L; cleaned, dehydrated, and sealed; marked ACR on harddrawn temper, except as otherwise indicated.
B.Wrought-Copper Solder Joint Fittings: ANSI B16.22.
C.Copper Tube Unions: Provide standard products recommended by manufacturer for use in service indicated.
2.04 BASIC PIPES AND PIPE FITTINGS
A.General Requirements: Provide pipes and pipe fittings in accordance with the following listings:
1.Tube Size 41/8Inch and Smaller: Copper tube, Type ACR, hard drawn temper, wrought copper, solder joint fittings, brazed joints.
2.Tube Size 7/8Inch through 41/8Inch: Copper tube, Type ACR, soft annealed temper, wrought copper, solder joint fittings, brazed joints.
3.Copper Tube, PreCharged Tube, Size 7/8Inch and Smaller: Wall, ASCR soft annealed temper fitting, quick connect.
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B.Brazed Joints: Braze joints using American Welding Society (AWS) Classification BcuP4 for brazing filler metal.
C.Underground Pipe Sleeves: Provide PVC or ABS, Schedule 40 plastic pipe.
2.05 SPECIAL REFRIGERANT VALVES
A.General Requirements: Special valves required for refrigeration piping systems include the following types:
1.Globe ShutOff Valves: Forged brass, packed, back seating, winged seal cap, 300degreeF (149degreeC) temperature rating, 500psi working pressure.
2.Check Valves: Forged brass, accessible internal parts, soft synthetic seat, fully guided brass piston and stainless steel spring, 250degreeF (120degreeC) temperature rating, 500psi working pressure.
3.2-Way Solenoid Valves: Forged brass, designed to comply with ARI760, normally closed, Teflon valve seat, NEMA 1 solenoid enclosure, 24 or 110 volt, 60Hertz, ULlisted, 1/2inch conduit adapter, 250degreeF (121degreeC) temperature rating, 400psi working pressure.
2.06 REFRIGERANT SPECIALTIES
A.Refrigerant Strainers: Brass shell and end connections, brazed joints, monel screen, 100mesh, ULlisted, 350psi working pressure.
B.MoistureLiquid Indicators: Forged brass, single port, removable cap, polished optical class, solder connections, UL listed, 200degreeF (93degreeC) temperature rating, 500psi working pressure.
PART 3 - EXECUTION
3.01 INSTALLATION OF REFRIGERATION PIPING
A.General Requirements: Install refrigerant piping in accordance with Division23 basic materials and methods sections, and in accordance with equipment manufacturer’s recommendations.
B.Cleaning: Remove scale and dirt on inside and outside before assembly.
3.02 INSTALLATION OF SPECIAL REFRIGERANT VALVES
A.General Requirements: Install refrigerant valves where indicated, and in accordance with manufacturer’s instructions. Remove accessible internal parts before soldering or brazing; replace after joints are completed.
B.Solenoid Valves: Install in refrigerant piping as indicated with stem point upwards.
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1.Wiring of solenoid valves is specified in applicable Division26 sections and is included as work of this Section.
3.03 INSTALLATION OF REFRIGERANT ACCESSORIES
A.Refrigerant Strainers: Install in refrigerant lines as indicated, and in accessible location for service.
B.MoistureLiquid Indicators: Install as indicated on refrigerant liquid lines, in accessible location.
C.Refrigerant FilterDryers: Install in refrigerant lines as indicated, and in accessible location for service.
3.04 FIELD QUALITY CONTROL
A.Refrigerant Piping Leak Test: Prior to initial operation, test refrigerant piping in accordance with ANSI B31.5, Refrigeration Piping. Perform initial test with dry Nitrogen, using soap solution to test all joints. Perform final test with 27inch vacuum. System shall be entirely leakfree.
1.Repair or replace refrigerant piping as required to eliminate leaks, and retest as specified to demonstrate compliance.
3.05 DEHYDRATION AND CHARGING SYSTEM
A.General Requirements:
1.Install core in filter dryer after leak test but before evacuation.
2.Evacuate refrigerant system with vacuum pump.
3.Maintain vacuum on system for minimum of 24hours after closing valve between vacuum pump and system.
4.Break vacuum with refrigerant gas; allow pressure to build up to 2psi.
5.Complete charging of system. Provide full operating charge.
3.06 SPECIAL INSTALLATION REQUIREMENTS - REFRIGERANT PIPING
A.General Requirements:
1.Install vibration eliminators on all condensing units.
2.DO NOT install unions on the condensing units and DX coils.
3.Install a liquid line dryer and a sight class by the rooftop condensing units.
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4.Provide isolation valves on all refrigerant lines at the compressor.
5.Provide crankcase heaters on condensing units.
6.Provide replaceable filter elements for refrigerant drier.
7.On refrigeration piping, use inert nitrogen gas as a purge while silfossing joints 1inch and greater.
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Note to Specifier: Incorporate a hotgas unloading or some means of unloading/capacity control in 3ton units and above.
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END OF SECTION
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