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<br />CFOE OFILA
<br />9-30-25
<br />TATS ACINAHCEMExp. No.
<br />ARHAHS
<br />EFORPDERETSI
<br />E
<br />G
<br />R
<br />AINR
<br />REENIGNEL
<br />M24912 NAZRAFM
<br />ER
<br />E
<br />NIGNELANOISS
<br />DATE: 6.12.2025
<br />SCALE: SEE PLANS
<br />ISSUE DATE
<br />REVISION DATE
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<br />SECTION 232301 - VRV/VRF REFRIGERANT PIPING
<br />PART 1 - GENERAL
<br />1.1 SUMMARY
<br />A. THIS SECTION INCLUDES REFRIGERANT PIPING USED FOR VRV/VRF AIR-CONDITIONING APPLICATIONS.
<br />1.2 PERFORMANCE REQUIREMENTS
<br />A. LINE TEST PRESSURE FOR REFRIGERANT R-410A:
<br />1. SUCTION (LOW PRESSURE GAS) LINES: 550 PSIG, OR PER EQUIPMENT MANUFACTURERS
<br />RECOMMENDATION.
<br />2. HOT-GAS (HIGH PRESSURE GAS) AND LIQUID LINES: 550 PSIG, OR PER EQUIPMENT MANUFACTURERS
<br />RECOMMENDATION.
<br />1.3 SUBMITTALS
<br />A. PRODUCT DATA: FOR EACH TYPE OF VALVE AND REFRIGERANT PIPING SPECIALTY INDICATED.
<br />INCLUDE PRESSURE DROP BASED ON MANUFACTURER'S TEST DATA.
<br />B. SHOP DRAWINGS: SHOW LAYOUT OF REFRIGERANT PIPING AND SPECIALTIES, INCLUDING PIPE, TUBE,
<br />AND FITTING SIZES, VALVE ARRANGEMENTS AND LOCATIONS, WALL AND FLOOR PENETRATIONS, AND
<br />EQUIPMENT CONNECTION DETAILS. SHOW INTERFACE AND SPATIAL RELATIONSHIPS BETWEEN PIPING AND
<br />EQUIPMENT.
<br />1. REFRIGERANT PIPING INDICATED ON DRAWINGS IS SCHEMATIC ONLY. SIZE PIPING AND DESIGN
<br />ACTUAL PIPING LAYOUT, INCLUDING SPECIALTIES, AND PIPE AND TUBE SIZES TO ACCOMMODATE, AS A
<br />MINIMUM, EQUIPMENT PROVIDED, ELEVATION DIFFERENCE BETWEEN COMPRESSOR AND EVAPORATOR,
<br />AND LENGTH OF PIPING TO ENSURE PROPER OPERATION AND COMPLIANCE WITH WARRANTIES OF
<br />CONNECTED EQUIPMENT.
<br />C. FIELD QUALITY-CONTROL TEST REPORTS.
<br />D. OPERATION AND MAINTENANCE DATA.
<br />1.4 QUALITY ASSURANCE
<br />A. COMPLY WITH ASHRAE 15, "SAFETY CODE FOR REFRIGERATION SYSTEMS."
<br />B. COMPLY WITH ASME B31.5, "REFRIGERATION PIPING AND HEAT TRANSFER COMPONENTS."
<br />C. INSTALLER QUALIFICATION: ONLY TRAINED INSTALLERS SKILLED IN REFRIGERATION PIPE
<br />INSTALLATION AND BRAZING OF COPPER TUBING SHOULD BE USED.
<br />1.5 PRODUCT STORAGE AND HANDLING
<br />A. STORE PIPING IN A CLEAN AND PROTECTED AREA WITH END CAPS IN PLACE TO ENSURE THAT PIPING
<br />INTERIOR AND EXTERIOR ARE CLEAN WHEN INSTALLED.
<br />PART 2 - PRODUCTS
<br />2.1 COPPER TUBE AND FITTINGS
<br />A. COPPER TUBE:
<br />1. STRAIGHT LENGTHS: ASTM B 75, UNS C12200, H55 TEMPER (LIGHT DRAWN), ACR BENDING QUALITY;
<br />CLEANED, EDDY CURRENT TESTED, AND PLUGGED PER ASTM B 280.
<br />a. REFTEKK "HHC"
<br />2. COILED: ASTM B 280, UNS C12200, O60 TEMPER (SOFT ANNEALED), ACR, CLEANED AND CAPPED
<br />a. REFTEKK "CCE"
<br />B. BRAZING FILLER METALS: AWS A5.8.
<br />a. REFTEKK "BRG"
<br />C. FIELD SWAGED BRAZING CUPS: MSS-SP-73, ASME B 16.50
<br />D. FIELD BENDS (ALL ANGLES): ASME B31.5
<br />2.2 VALVES AND SPECIALTIES
<br />A. SERVICE VALVES:
<br />1. BODY: FORGED BRASS WITH BRASS CAP INCLUDING KEY END TO REMOVE CORE.
<br />2. CORE: REMOVABLE BALL-TYPE CHECK VALVE WITH STAINLESS-STEEL SPRING.
<br />3. SEAT: POLYTETRAFLUOROETHYLENE.
<br />4. END CONNECTIONS: SOCKET ENDS.
<br />5. WORKING PRESSURE RATING: 700 PSIG.
<br />6. MAXIMUM OPERATING TEMPERATURE 250 DEG. F
<br />7. VALVES MUST BE SPECIFICALLY RATED FOR R-410A.
<br />2.3 REFRIGERANTS
<br />A. AVAILABLE MANUFACTURERS: SUBJECT TO COMPLIANCE WITH REQUIREMENTS, MANUFACTURERS
<br />OFFERING PRODUCTS THAT MAY BE INCORPORATED INTO THE WORK INCLUDE, BUT ARE NOT LIMITED TO,
<br />THE FOLLOWING:
<br />B. ASHRAE 34, R-410A: R-32/R-125 (50.0/50.0)
<br />PART 3 - EXECUTION
<br />3.1 PIPING APPLICATIONS
<br />A. SUCTION (LOW PRESSURE GAS), HOT GAS (HIGH PRESSURE GAS) AND LIQUID LINES OD 5/8" AND
<br />SMALLER FOR CONVENTIONAL AIR-CONDITIONING, HEAT PUMP, AND HEAT RECOVERY APPLICATIONS:
<br />COPPER, TYPE ACR, O60 (SOFT ANNEALED)-TEMPER TUBING AND FIELD BENT FITTINGS WITH BRAZED
<br />JOINTS.
<br />B. SUCTION (LOW PRESSURE GAS), HOT GAS (HIGH PRESSURE GAS), AND LIQUID LINES OD 2-1/8" AND
<br />SMALLER FOR ED CONVENTIONAL AIR-CONDITIONING, HEAT PUMP, AND HEAT RECOVERY APPLICATIONS:
<br />STRAIGHT LENGTHS, COPPER, TYPE ACR TYPE L, H55 (LIGHT DRAWN)-TEMPER TUBING AND FIELD BENT
<br />FITTINGS WITH BRAZED JOINTS.
<br />3.2 VALVE AND SPECIALTY APPLICATIONS
<br />A. INSTALL SERVICE VALVES AS SHOWN ON PLANS OR AS REQUIRED TO ISOLATE SYSTEM
<br />COMPONENTS.
<br />3.3 PIPING INSTALLATION
<br />A. DRAWING PLANS, SCHEMATICS, AND DIAGRAMS INDICATE GENERAL LOCATION AND ARRANGEMENT
<br />OF PIPING SYSTEMS;
<br />INDICATED LOCATIONS AND ARRANGEMENTS WERE USED TO SIZE PIPE AND CALCULATE FRICTION LOSS,
<br />EXPANSION, PUMP SIZING, AND OTHER DESIGN CONSIDERATIONS. INSTALL PIPING AS INDICATED UNLESS
<br />DEVIATIONS TO LAYOUT ARE APPROVED ON SHOP DRAWINGS.
<br />B. INSTALL REFRIGERANT PIPING ACCORDING TO ASHRAE 15.
<br />C. INSTALL PIPING IN CONCEALED LOCATIONS UNLESS OTHERWISE INDICATED AND EXCEPT IN
<br />EQUIPMENT ROOMS AND SERVICE AREAS.
<br />D. INSTALL PIPING INDICATED TO BE EXPOSED AND PIPING IN EQUIPMENT ROOMS AND SERVICE AREAS
<br />AT RIGHT ANGLES OR PARALLEL TO BUILDING WALLS. DIAGONAL RUNS ARE PROHIBITED UNLESS
<br />SPECIFICALLY INDICATED OTHERWISE.
<br />E. INSTALL PIPING ABOVE ACCESSIBLE CEILINGS TO ALLOW SUFFICIENT SPACE FOR CEILING PANEL
<br />REMOVAL.
<br />F. INSTALL PIPING ADJACENT TO MACHINES TO ALLOW SERVICE AND MAINTENANCE.
<br />G. INSTALL PIPING FREE OF SAGS AND BENDS
<br />.
<br />H. FIELD BEND CHANGES IN DIRECTION.
<br />I. SELECT SYSTEM COMPONENTS WITH PRESSURE RATING EQUAL TO OR GREATER THAN MAXIMUM
<br />ALLOWABLE WORKING
<br />PRESSURE.
<br />J. INSTALL PIPING AS SHORT AND DIRECT AS POSSIBLE, WITH A MINIMUM NUMBER OF JOINTS, ELBOWS,
<br />AND FITTINGS.
<br />K. ARRANGE PIPING TO ALLOW INSPECTION AND SERVICE OF REFRIGERATION EQUIPMENT. INSTALL
<br />VALVES AND SPECIALTIES IN ACCESSIBLE LOCATIONS TO ALLOW FOR SERVICE AND INSPECTION. INSTALL
<br />ACCESS DOORS OR PANELS AS SPECIFIED IN DIVISION 08 SECTION "ACCESS DOORS AND FRAMES" IF
<br />VALVES OR EQUIPMENT REQUIRING MAINTENANCE IS CONCEALED BEHIND FINISHED SURFACES.
<br />L. INSTALL INSULATED REFRIGERANT PIPING IN WATER-TIGHT PROTECTIVE CONDUIT WHERE INSTALLED
<br />BELOWGROUND.
<br />M. PROVIDE JACKETED INSULATION IN LOCATIONS WHERE EXPOSED TO MECHANICAL INJURY.
<br />N. WHEN BRAZING, REMOVE SOLENOID-VALVE COILS AND SIGHT GLASSES; ALSO, REMOVE
<br />VALVE STEMS, SEATS, AND PACKING, AND ACCESSIBLE INTERNAL PARTS OF REFRIGERANT SPECIALTIES.
<br />DO NOT APPLY HEAT NEAR EXPANSION-VALVE BULB.
<br />O. INSTALL PIPING WITH ADEQUATE CLEARANCE BETWEEN PIPE AND ADJACENT WALLS AND HANGERS
<br />OR BETWEEN PIPES FOR INSULATION INSTALLATION.
<br />P. IDENTIFY REFRIGERANT PIPING AND VALVES ACCORDING TO DIVISION 23 SECTION "IDENTIFICATION
<br />FOR HVAC PIPING AND EQUIPMENT."
<br />Q. INSTALL SLEEVES FOR PIPING PENETRATIONS OF WALLS, CEILINGS, AND FLOORS. COMPLY WITH
<br />REQUIREMENTS FOR SLEEVES SPECIFIED IN DIVISION 23 SECTION "SLEEVES AND SLEEVE SEALS FOR HVAC
<br />PIPING."
<br />R. INSTALL SLEEVE SEALS FOR PIPING PENETRATIONS OF CONCRETE WALLS AND SLABS. COMPLY WITH
<br />REQUIREMENTS FOR SLEEVE SEALS SPECIFIED IN DIVISION 23 SECTION "SLEEVES AND SLEEVE SEALS FOR
<br />HVAC PIPING."
<br />S. INSTALL ESCUTCHEONS FOR PIPING PENETRATIONS OF WALLS, CEILINGS, AND FLOORS. COMPLY
<br />WITH REQUIREMENTS FOR ESCUTCHEONS SPECIFIED IN DIVISION 23 SECTION "ESCUTCHEONS FOR HVAC
<br />PIPING."
<br />T. PROVIDE PROPER COMPENSATION FOR PIPE/TUBE EXPANSION AND CONTRACTION PER EQUIPMENT
<br />MANUFACTURERS RECOMMENDATIONS.
<br />3.4 PIPE JOINT CONSTRUCTION
<br />A. BRAZED JOINTS: CONSTRUCT JOINTS ACCORDING TO AWS'S "BRAZING HANDBOOK," CHAPTER "PIPE
<br />AND TUBE."
<br />1. USE TYPE BCUP-5 (15% AG, 80% CU, 5% P), COPPER-PHOSPHORUS ALLOY PRE-FORMED BRAZING
<br />RINGS FOR JOINING COPPER SWAGE FITTINGS AND COPPER SOCKET FITTINGS WITH COPPER PIPE. DO NOT
<br />USE FLUX.
<br />2. USE TYPE BAG-5 (45% AG), CADMIUM-FREE SILVER ALLOY FOR JOINING COPPER WITH BRONZE OR
<br />STEEL. USE MANUFACTURERS RECOMMENDED FLUX.
<br />B. FIELD SWAGED BRAZING CUPS: FABRICATE BRAZING CUP ON ONE TUBING END FOR EACH COUPLING.
<br />ONLY O60 (SOFT ANNEALED) AND H55 (LIGHT DRAWN) MAY BE SWAGED. DO NOT SWAGE H58 (DRAWN
<br />GENERAL PURPOSE). USE SWAGING TOOL DESIGNED TO PROVIDE A MINIMUM OF 0.0015" BRAZING GAP AND
<br />A MAXIMUM OF 0.005" BRAZING GAP. BRAZING CUP DEPTH FOR EACH TUBE SIZE SHALL BE AS FOLLOWS.
<br />C. FIELD BENDS: FABRICATE FIELD BENDS WITH A CENTER-LINE BEND RADIUS GREATER THAN OR
<br />EQUAL TO 4 TIMES THE NOMINAL OD OF THE PIPE OR TUBE. TUBE SHALL BE BENT WITH A TUBING BENDER
<br />SIZED FOR ACR OD TUBE SIZES AND SHALL NOT CAUSE CRACKS OR WRINKLES IN THE TUBE OR PIPE. DO
<br />NOT USE A CONDUIT BENDER FOR BENDING
<br />ACR COPPER. THE DIFFERENCE BETWEEN MAXIMUM AND MINIMUM DIAMETERS FOR PIPE BENDS SHOULD
<br />NOT EXCEED 8% OF THE NOMINAL OUTSIDE DIAMETER OF THE PIPE. ONLY O60 SOFT ANNEALED-TEMPER
<br />AND H55 LIGHT DRAWN-TEMPER SHALL BE FIELD BENT. DO NOT FIELD BEND H58 DRAWN GENERAL
<br />PURPOSE-TEMPER COPPER TUBE.
<br />D. BRAZING AND JOINING PROCEDURE
<br />1. TUBE ENDS SHALL BE CUT WITH A CLEAN SHARP TUBING CUTTER.
<br />2. DEBURR THE I.D. OF THE CUT TUBE END WITH A CLEAN DEBURRING TOOL.
<br />3. VISUALLY INSPECT THE INTERIOR OF EACH TUBE FOR OBSTRUCTIONS AND DEBRIS BEFORE
<br />ASSEMBLY. PROTECT THE JOINT FROM CONTAMINATION BEFORE BRAZING.
<br />4. METHOD OF PRE-CLEANING: NON-SHEDDING ABRASIVE PADS (SCOTCH BRIGHT) TO REMOVE ALL
<br />OXIDES IN THE BRAZING AREA FOLLOWED BY WIPING WITH A CLEAN LINT-FREE WHITE CLOTH. DO NOT
<br />GROOVE THE SURFACES WHILE CLEANING.
<br />5. PURGE ALL TUBING WITH OIL FREE NITROGEN WHILE BRAZING AND UNTIL COOL TO THE TOUCH. USE
<br />AN OXYGEN ANALYZER TO VERIFY THE ABSENCE OF OXYGEN PRIOR TO BRAZING. THE OXYGEN CONTENT
<br />SHALL BE LESS THAN 1% BEFORE START OF BRAZING.
<br />6. USE A NEUTRAL TO SLIGHTLY REDUCING FLAME USING OXY/ACETYLENE OR OXY/PROPANE.
<br />7. USE THE PROPER TORCH TIP BASED ON TUBE SIZE AS RECOMMENDED BY THE TORCH
<br />MANUFACTURER. USE OF TURBO-TORCH OR ROSEBUD IS PERMITTED.
<br />8. POST BRAZING CLEANING: EXTERIOR OF ALL COMPLETED JOINTS SHALL BE WASHED WITH A WATER
<br />SOAKED RAG OR SPONGE, FOLLOWED BY BRUSHING WITH A STAINLESS-STEEL HAND WIRE BRUSH TO
<br />REMOVE ANY RESIDUE FOR INSPECTION.
<br />3.5 HANGERS AND SUPPORTS
<br />A. HANGER, SUPPORT, AND ANCHOR PRODUCTS ARE SPECIFIED IN DIVISION 23 SECTION "HANGERS AND
<br />SUPPORTS FOR HVAC PIPING AND EQUIPMENT."
<br />B. INSTALL THE FOLLOWING PIPE ATTACHMENTS:
<br />1. ADJUSTABLE STEEL CLEVIS HANGERS FOR INDIVIDUAL HORIZONTAL RUNS.
<br />2. RIGID HIGH COMPRESSIVE STRENGTH FOAM INSULATING PIPE SUPPORT AT ALL SUPPORT POINTS.
<br />COMPLY WITH SECTION 230719 "DX PIPING SYSTEM INSULATION".
<br />3. DO NOT ATTACH HANGERS DIRECTLY TO PIPE OR TUBE.
<br />C. INSTALL HANGERS FOR COPPER TUBING WITH THE FOLLOWING MAXIMUM SPACING AND MINIMUM
<br />ROD SIZES:
<br />1. UP TO 3/4" OD: MAXIMUM SPAN, 60 INCHES; MINIMUM ROD SIZE, 3/8 INCH.
<br />2. GREATER THAN 3/4" THRU 1" OD: MAXIMUM SPAN, 72 INCHES; MINIMUM ROD SIZE, 3/8 INCH
<br />3. GREATER THAN 1" THRU 2-1/8" OD: MAXIMUM SPAN, 96 INCHES; MINIMUM ROD SIZE, 3/8 INCH.
<br />D. SUPPORT MULTI-FLOOR VERTICAL RUNS EVERY 10 FEET AND AT LEAST AT EACH FLOOR.
<br />3.6 FIELD QUALITY CONTROL
<br />A. PERFORM TESTS AND INSPECTIONS AND PREPARE TEST REPORTS.
<br />B. TESTS AND INSPECTIONS:
<br />1. COMPLY WITH ASME B31.5, CHAPTER VI.
<br />2. TEST AS RECOMMENDED BY EQUIPMENT MANUFACTURERS INSTRUCTIONS.
<br />3. TEST REFRIGERANT PIPING AND SPECIALTIES. ISOLATE COMPRESSOR, CONDENSER, EVAPORATOR,
<br />AND SAFETY DEVICES FROM TEST PRESSURE IF THEY ARE NOT RATED ABOVE THE TEST PRESSURE.
<br />a. FILL SYSTEM WITH 95/5 NITROGEN/HYDROGEN TO THE REQUIRED TEST PRESSURE.
<br />b. SYSTEM SHALL MAINTAIN TEST PRESSURE AT THE MANIFOLD GAGE THROUGHOUT DURATION OF
<br />TEST.
<br />c. TEST ALL JOINTS AND FITTINGS WITH HYDROGEN LEAK DETECTOR, AT TEST PRESSURE.
<br />d. REMAKE LEAKING JOINTS USING NEW MATERIALS, AND RETEST UNTIL SATISFACTORY RESULTS ARE
<br />ACHIEVED.
<br />3.7 SYSTEM CHARGING
<br />A. CHARGE SYSTEM USING THE FOLLOWING PROCEDURES AND PER EQUIPMENT MANUFACTURERS
<br />INSTRUCTIONS.
<br />1. EVACUATE (TRIPLE EVACUATION PROCEDURE) ENTIRE REFRIGERANT SYSTEM WITH A VACUUM PUMP
<br />TO OBTAIN A STEADY STATE VACUUM OF LESS THAN 500 MICROMETERS. IF VACUUM HOLDS FOR 12 HOURS,
<br />SYSTEM IS READY FOR CHARGING. DO NOT EVACUATE THE SYSTEM THROUGH A CHARGING MANIFOLD.
<br />USE ONLY SUCTION RATED HOSES AND CORE REMOVAL TOOLS.
<br />2. BREAK VACUUM WITH REFRIGERANT GAS, ALLOWING PRESSURE TO BUILD UP TO 2 PSIG.
<br />3. CHARGE SYSTEM AS RECOMMENDED BY EQUIPMENT MANUFACTURER.
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