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   PART 1 - GENERAL

    01 DESCRIPTION OF WORK

    A. Extent of refrigerant piping work is indicated on drawings and schedules, and by requirements of this section.

    1. Refrigerant suction line piping between compressors and cooling coils.

    2. Refrigerant liquid line piping between condensers or liquid receivers and cooling coils.

    3. Refrigerant hot-gas line piping between compressors and condensers.

    1.02 QUALITY ASSURANCE

    A. Manufacturer's Qualifications: Firms regularly engaged in manufacture of refrigerant piping products, of types, materials, and sizes required, whose products have been in satisfactory use in similar service for not less than 5 years.

    B. Installer's Qualifications: Firm with at least 3 years of successful installation experience on projects with refrigerant piping work similar to that required for project.

    1.03 CODES AND STANDARDS

    A. ASHRAE Compliance: Fabricate and install refrigerant piping in accordance with ASHRAE 15 "Safety Code for Mechanical Refrigeration".

    B. ANSI/ARI 495 - Refrigerant Liquid Receivers.

    C. ANSI/ASME SEC 9 - Boilers and Pressure Vessels Code, Welding and Brazing Qualifications.

    D. ANSI/ASME B16.22 - Wrought Copper and Copper Alloy Solder Joint Pressure Fittings.

    E. ANSI/ASME B16.26 - Cast Copper Alloy Fittings for Flared Copper Tubes.

    F. ANSI/ASTM B88 - Seamless Copper Water Tube.

    G. ANSI/AWS A5.8 - Brazing Filler Metal.

    H. ASTM B280 - Seamless Copper Tube for Air Conditioning and Refrigeration Field Service.

    1.04 SUBMITTALS

    A. Product Data: Submit manufacturer's technical product data and installation instructions for refrigerant piping materials and products.

    B. Brazing Certification: Certify brazing procedures, brazers and operators in accordance with ASME Standards (ANSI B31.5).

    C. Record Drawings: At project closeout, submit record drawings of installed refrigerant piping and piping products, in accordance with requirements of Division 1.

    D. Maintenance Data: Submit maintenance data and parts lists for refrigerant piping materials and products. Include this data, product data, and record drawings in maintenance manual; in accordance with requirements of Division 1.

   PART 2 - PRODUCTS

    02 MATERIALS AND PRODUCTS

    A. General: 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 to comply with installation requirements. Provide materials and products complying with ANSI B31.5 Code for Refrigeration Piping where applicable, base pressure rating on refrigerant piping system maximum design pressures. Provide sizes and types matching piping and equipment connections; provide fittings of materials which match pipe materials used in refrigerant piping systems. Where more than one type of materials or products are indicated, selection is Installer's option.

    03 BASIC IDENTIFICATION

    A. General: Provide identification complying with Division-15 Basic Mechanical Materials and Methods section "Mechanical Identification", in accordance with the following listing:

    1. Refrigerant Piping: Plastic pipe markers.

    04 BASIC PIPES AND PIPE FITTINGS

    A. General: Provide pipes and pipe fittings in accordance with the following listing:

    1. Tube Size 3/4" and Smaller: Copper tube; Type ACR, soft annealed temper; cast copper-alloy fittings for flared copper tubes; flared joints.

    2. Tube Size 7/8" through 1-3/8": Copper tube; Type ACR, soft annealed temper; wrought-copper, solder-joint fittings; brazed joints.

    3. Tube Size 1-5/8" through 4-1/8": Copper tube; Type ACR, hard drawn temper; wrought-copper, solder-joint fittings; brazed joints.

    B. Soldered Joints: Solder joints using silver-lead solder, ASTM B32, Grade 96 TS.

    C. Brazed Joints: Braze joints using American Welding Society (AWS) classification BCuP-4 for brazing filler metal.

    2.02 BASIC SUPPORTS AND ANCHORS

    A. General: Provide supports and anchors complying with Division-15 Basic Mechanical Materials and Methods section "Supports and Anchors".

    2.03 SPECIAL REFRIGERANT VALVES

    A. General: Special valves required for refrigerant piping include the following types:

    B. Globe and Check Valves:

    1. Globe Shutoff Valves: Forged brass, packed, back seating, winged seal cap, 300oF (149oC) temperature rating, 500 psi working pressure.

    2. Check Valves: Forged brass, accessible internal parts, soft synthetic seat, fully guided brass piston and stainless steel spring, 250oF (121oC) temperature rating, 500 psi working pressure.

    3. Available Manufacturers: Subject to compliance with requirements, manufacturers offering globe and check valves which may be incorporated in the work include, but are not limited to, the following:

    a) Henry Valve Co.

    b) Parker Hannifin Corp.; Refrigeration & Air-Cond. Div.

    c) Sporlan Valve Co.

    C. Solenoid Valves:

    1. 2-Way Solenoid Valves: Forged brass, designed to conform to ARI 760 and UL 429, normally closed, teflon valve seat, NEMA 1 solenoid enclosure, UL-listed, 1/2" conduit adapter, 250oF (121oC) temperature rating, 400 psi working pressure.

    2. Manual Operator: Provide manual operator to open valve.

    3. Available Manufacturers: Subject to compliance with requirement, manufacturers offering solenoid valves which may be incorporated in the work include, but are not limited to, the following:

    a) Alco Controls Div.; Emerson Electric Co.

    b) Automatic Switch Co.

    c) Sporland Valve Co.

    2.04 REFRIGERANT SPECIALTIES

    A. Refrigerant Strainers: Brass shell and end connections, brazed joints, monel screen, 100 mesh, UL-listed, 350 psi working pressure.

    B. Moisture-Liquid Indicators: Forged brass, single port, removable cap, polished optical glass, solder connections, UL-listed, 200oF (93oC) temperature rating, 500 psi working pressure.

    C. Refrigerant Filter-Driers: Steel shell, ceramic fired desiccant core, solder connections, UL-listed, 500 psi working pressure. Liquid line dryers shall conform to ARI 710.

    D. Refrigerant Filter-Driers: Corrosion-resistant steel shell, steel flange ring and spring, wrought copper fittings, ductile iron cover plate with steel cap screws, replaceable filter-drier core, 500 psi working pressure.

    E. Evaporator Pressure Regulators: Provide corrosion-resistant, spring loaded, stainless steel springs, pressure operated, evaporator pressure regulator, in size and working pressure indicated, with copper connections. Thermostatic expansion valves shall conform to ARI-750.

    F. Refrigerant Discharge Line Mufflers: Provide discharge line mufflers as recommended by equipment manufacturer for use in service indicated, UL-listed.

    G. Available Manufacturers: Subject to compliance with requirements, manufacturers offering refrigeration accessories which may be incorporated in the work include, but are not limited to, the following:

    1. Alco Controls Div.; Emerson Electric Co.

    2. Henry Valve Co.

    3. Parker-Hannifin Corp.; Refrigeration & Air-Conditioning Div.

    4. Sporlan Valve Co.

   PART 3 - EXECUTION

    05 INSPECTION

    A. General: Examine areas and conditions under which refrigerant piping systems materials and products are to be installed. Do not proceed with work until unsatisfactory conditions have been corrected in manner acceptable to Installer.

    06 INSTALLATION OF BASIC IDENTIFICATION

    A. General: Install mechanical identification in accordance with Division-15 Basic Mechanical Materials and Methods section "Mechanical Identification".

    07 INSTALLATION OF REFRIGERANT PIPING

    A. General: Install refrigerant piping in accordance with Division-15 Basic Mechanical Materials and Methods section "Pipes and Pipe Fittings", and in compliance with equipment manufacturer's recommendations.

    B. Installation: Install refrigerant piping with 1/4" per foot (2%) downward slope in direction of oil return to compressor. Provide oil traps and double risers where indicated, and where required to provide oil return.

    C. Cleaning: Care shall be taken to insure a clean and tight system. Cleaning of tubing shall be as follows using a clean, lintless cloth:

    1. Pull through a clean cloth to remove coarse particles.

    2. Pull through a clean cloth saturated with R113 or Virginia No. 10 or approved equal.

    3. Pull through a clean cloth saturated with compressor oil.

    4. Perform visual inspection.

    5. Pull through a clean dry cloth.

    B. Leak Testing: Refrigerant piping shall first be leak-tested with nitrogen or carbon dioxide and liquid soap suds solution and any leaks corrected. In the event of loss of charge for precharged systems, the system shall then be evacuated to 20 inches (508mm) vacuum, charged with refrigerant to 15 psig and leak-tested using a Halide leak detector. Finally, the system pressure shall be increased with nitrogen or carbon dioxide to 300 psig on the high side and 200 psig on the low side of the system and given a final leak test. Leaks shall be repaired by disassembling the connection, cleaning the fitting and remaking. Leaks shall not be repaired by adding brazing material.

    3.02 INSTALLATION OF SPECIAL REFRIGERANT VALVES

    A. General: 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 pointing upwards.

    1. Wiring of solenoid valves is specified in applicable Division-16 sections; not 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. Moisture-Liquid Indicators: Install as indicated on refrigerant liquid lines, in accessible location.

    C. Refrigerant Filter-Dryers: Install in refrigerant lines as indicated, and in accessible location for service.

    D. Evaporator Pressure Regulators: Install in refrigerant suction lines or evaporator outlets as indicated. Adjust, if required, for proper evaporator pressure.

    E. Refrigerant Discharge Line Mufflers: Install as indicated, in horizontal or downflow portion of hot-gas lines, immediately after leaving compressor; not in riser.

    3.04 EQUIPMENT CONNECTIONS

    A. General: Connect refrigerant piping to mechanical equipment as indicated, and comply with equipment manufacturer's instructions where not otherwise indicated.

    3.05 DEHYDRATION AND CHARGING SYSTEM

    A. General: The system shall be double dehydrated. The system shall be pumped down to 0.2 inches of mercury absolute pressure by a vacuum pump suitable for this purpose, and the pump shall be left operating for 8 hours. Dry nitrogen shall then be admitted directly to the system. The system shall then again be evacuated to 0.2 inches mercury absolute and the pump left operating for four hours. The system shall then be charged with refrigerant.

    B. The system shall be in accordance with ASME Code for unfired pressure vessels.

    3.06 ADJUSTING AND CLEANING

    A. Cleaning and Inspecting: Clean and inspect refrigerant piping systems in accordance with requirements of Division-15 Basic Mechanical Materials and Methods section "Pipes and Pipe Fittings".

   END OF SECTION