This Product MasterSpec Section modifies the original MasterSpec text, and does not include the full content of the original MasterSpec Section




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Copyright 2004 and 2005 AIA MASTERSPEC Short Form 06/04 (R 06/05)

PRODUCT MASTERSPEC LICENSED BY ARCOM TO CONBRACO INDUSTRIES, INC.

Copyright 2004 and 2005 by The American Institute of Architects (AIA)

Exclusively published and distributed by Architectural Computer Services, Inc. (ARCOM) for the AIA

This Product MasterSpec Section is licensed by ARCOM to Conbraco Industries, Inc. ("Licensee").

This Product MasterSpec Section modifies the original MasterSpec text, and does not include the full content of the original MasterSpec Section

Revisions made to the original MasterSpec text are made solely by the Licensee and are not endorsed by, or representative of the opinions of, ARCOM or The American Institute of Architects (AIA). Neither AIA nor ARCOM are liable in any way for such revisions or for the use of this Product MasterSpec Section by any end user. A qualified design professional should review and edit the document to suit project requirements.

For more information, contact Conbraco Industries, Inc., 701 Matthews-Mint Hill Road, Matthews, NC 28105 phone: (704) 847-9191 fax: (704) 841-6021. Website: www.conbraco.com; e-mail: mike.green@conbraco.com.

For information about MasterSpec contact ARCOM at (800) 424-5080 or visit www.MasterSpec.com.

SECTION 232300 - REFRIGERANT PIPING

Verify that Section titles referenced in this Section are correct for this Project's Specifications; Section titles may have changed.

PART 1 - GENERAL

1.1SUMMARY

A.This Section includes refrigerant piping used for air-conditioning applications.

1.2PERFORMANCE REQUIREMENTS

A.Line Test Pressure for Refrigerant R-22:

1.Suction Lines for Air-Conditioning Applications: 185 psig (1276 kPa).

2.Suction Lines for Heat-Pump Applications: 325 psig (2241 kPa).

3.Hot-Gas and Liquid Lines: 325 psig (2241 kPa).

1.3SUBMITTALS

A.Product Data: For each type of valve and refrigerant piping specialty indicated. Include pressure drop based on manufacturer's test data.

B.Shop Drawings: Show layout of refrigerant piping and specialties, including pipe, tube, and fitting sizes, flow capacities, valve arrangements and locations, slopes of horizontal runs, oil traps, double risers, wall and floor penetrations, and equipment connection details. Show interface and spatial relationships between piping and equipment.

Retain subparagraph below to have Contractor size and design refrigeration piping.

1.Refrigerant piping indicated on Drawings is schematic only. Size piping and design actual piping layout, including oil traps, double risers, specialties, and pipe and tube sizes to accommodate, as a minimum, equipment provided, elevation difference between compressor and evaporator, and length of piping to ensure proper operation and compliance with warranties of connected equipment.

C.Field quality-control test reports.

D.Operation and maintenance data.

1.4QUALITY ASSURANCE

A.Comply with ASHRAE 15, "Safety Code for Refrigeration Systems."

B.Comply with ASME B31.5, "Refrigeration Piping and Heat Transfer Components."

1.5PRODUCT STORAGE AND HANDLING

A.Store piping in a clean and protected area with end caps in place to ensure that piping interior and exterior are clean when installed.

PART 2 - PRODUCTS

Coordinate first article below with "Piping Applications" Article in Part 3. See "Writing Guide" Article in the Evaluations. Materials included in this Section are examples listed in the 2000 ASHRAE HANDBOOK - "HVAC Systems and Equipment," Chapter 41, "Pipe, Tubes, and Fittings."

2.1COPPER TUBE AND FITTINGS

Conbraco does not manufacture products complying with the requirements of this article.

A.Copper Tube: [ASTM B 88, Type K or L (ASTM B 88M, Type A or B)] [ASTM B 280, Type ACR].

B.Wrought-Copper Fittings: ASME B16.22.

C.Wrought-Copper Unions: ASME B16.22.

See Evaluations for discussions of solder and brazing materials.

D.Solder Filler Metals: ASTM B 32. Use 95-5 tin antimony or alloy HB solder to join copper socket fittings on copper pipe.

E.Brazing Filler Metals: AWS A5.8.

F.Flexible Connectors:

1.Body: Tin-bronze bellows with woven, flexible, tinned-bronze-wire-reinforced protective jacket.

2.End Connections: Socket ends.

3.Offset Performance: Capable of minimum 3/4-inch (20-mm) misalignment in minimum 7-inch- (180-mm-) long assembly.

4.Pressure Rating: Factory test at minimum 500 psig (3450 kPa).

5.Maximum Operating Temperature: 250 deg F (121 deg C).

2.2VALVES AND SPECIALTIES

A.Forged Brass Ball Valves:

1.Basis-of-Design Product: Subject to compliance with requirements, provide Conbraco Industries, Inc.; Apollo 79-700 Series, or a comparable product by one of the following:

a.Mueller Refrigeration Co. Inc.

b.JB Industries.

c.<Insert manufacturer’s name>.

2.Standard: UL listed, Guide SFJQ per UL 207.

3.Working Pressure Rating: 500 psig (3450 kPa).

4.Operating Temperature: -20 to 450 deg F (-29 to 232 deg C).

5.Body: Forged brass, hermetically sealed, ball design with straight-through pattern.

6.Stem: Brass.

7.Ball: Chrome-plated brass.

8.Safety Cap: Brass.

9.Cap Seal: Neoprene.

10.Seats and Packing: RPTFE, PTFE or TFE.

11.Port: Full.

12.Ends: Female, extended copper tube.

B.Diaphragm Packless Valves:

Conbraco does not manufacture products complying with the requirements of this paragraph.

1.Body and Bonnet: Forged brass or cast bronze; globe design with straight-through or angle pattern.

2.Diaphragm: Phosphor bronze and stainless steel with stainless-steel spring.

3.Operator: Rising stem and hand wheel.

4.Seat: Nylon.

5.End Connections: Socket, union, or flanged.

6.Working Pressure Rating: 500 psig (3450 kPa).

7.Maximum Operating Temperature: 275 deg F (135 deg C).

C.Packed-Angle Valves:

Conbraco does not manufacture products complying with the requirements of this paragraph.

1.Body and Bonnet: Forged brass or cast bronze.

2.Packing: Molded stem, back seating, and replaceable under pressure.

3.Operator: Rising stem.

4.Seat: Nonrotating, self-aligning polytetrafluoroethylene.

5.Seal Cap: Forged-brass or valox hex cap.

6.End Connections: Socket, union, threaded, or flanged.

7.Working Pressure Rating: 500 psig (3450 kPa).

8.Maximum Operating Temperature: 275 deg F (135 deg C).

D.Check Valves:

Conbraco does not manufacture products complying with the requirements of this paragraph.

1.Body: Ductile iron, forged brass, or cast bronze; globe pattern.

2.Bonnet: Bolted ductile iron, forged brass, or cast bronze; or brass hex plug.

3.Piston: Removable polytetrafluoroethylene seat.

4.Closing Spring: Stainless steel.

Retain first subparagraph below for optional manual opening feature.

5.Manual Opening Stem: Seal cap, plated-steel stem, and graphite seal.

6.End Connections: Socket, union, threaded, or flanged.

7.Maximum Opening Pressure: 0.50 psig (3.4 kPa).

8.Working Pressure Rating: 500 psig (3450 kPa).

9.Maximum Operating Temperature: 275 deg F (135 deg C).

E.Service Valves:

Conbraco does not manufacture products complying with the requirements of this paragraph.

1.Body: Forged brass with brass cap including key end to remove core.

2.Core: Removable ball-type check valve with stainless-steel spring.

3.Seat: Polytetrafluoroethylene.

4.End Connections: Copper spring.

5.Working Pressure Rating: 500 psig (3450 kPa).

Solenoid valves in first paragraph and subparagraphs below are made normally closed and normally open. Normally closed are direct acting and pilot operated. Holding coils are available in several voltages.

F.Solenoid Valves: Comply with ARI 760 and UL 429; listed and labeled by an NRTL.

Conbraco does not manufacture products complying with the requirements of this paragraph.

1.Body and Bonnet: Plated steel.

2.Solenoid Tube, Plunger, Closing Spring, and Seat Orifice: Stainless steel.

3.Seat: Polytetrafluoroethylene.

4.End Connections: Threaded.

5.Electrical: Molded, watertight coil in NEMA 250 enclosure of type required by location with 1/2-inch (16-GRC) conduit adapter, and [24] [115] [208]-V ac coil.

6.Working Pressure Rating: 400 psig (2760 kPa).

7.Maximum Operating Temperature: 240 deg F (116 deg C).

Subparagraph below is an optional feature.

8.Manual operator.

G.Safety Relief Valves: Comply with ASME Boiler and Pressure Vessel Code; listed and labeled by an NRTL.

1.Body and Bonnet: Ductile iron and steel, with neoprene O-ring seal.

2.Piston, Closing Spring, and Seat Insert: Stainless steel.

3.Seat Disc: Polytetrafluoroethylene.

4.End Connections: Threaded.

5.Working Pressure Rating: 400 psig (2760 kPa).

6.Maximum Operating Temperature: 240 deg F (116 deg C).

H.Thermostatic Expansion Valves: Comply with ARI 750.

Conbraco does not manufacture products complying with the requirements of this paragraph.

1.Body, Bonnet, and Seal Cap: Forged brass or steel.

2.Diaphragm, Piston, Closing Spring, and Seat Insert: Stainless steel.

3.Packing and Gaskets: Non-asbestos.

4.Capillary and Bulb: Copper tubing filled with refrigerant charge.

5.Suction Temperature: [40 deg F (4.4 deg C)] <Insert temperature>.

6.Superheat: [Adjustable] [Nonadjustable].

7.Reverse-flow option (for heat-pump applications).

8.End Connections: Socket, flare, or threaded union.

9.Working Pressure Rating: [700 psig (4820 kPa)] [450 psig (3100 kPa)] <Insert value>.

I.Straight-Type Strainers:

Conbraco does not manufacture products complying with the requirements of this paragraph.

1.Body: Welded steel with corrosion-resistant coating.

2.Screen: 100-mesh stainless steel.

3.End Connections: Socket or flare.

4.Working Pressure Rating: 500 psig (3450 kPa).

5.Maximum Operating Temperature: 275 deg F (135 deg C).

J.Angle-Type Strainers:

Conbraco does not manufacture products complying with the requirements of this paragraph.

1.Body: Forged brass or cast bronze.

2.Drain Plug: Brass hex plug.

3.Screen: 100-mesh monel.

4.End Connections: Socket or flare.

5.Working Pressure Rating: 500 psig (3450 kPa).

6.Maximum Operating Temperature: 275 deg F (135 deg C).

K.Moisture/Liquid Indicators:

Conbraco does not manufacture products complying with the requirements of this paragraph.

1.Body: Forged brass.

2.Window: Replaceable, clear, fused glass window with indicating element protected by filter screen.

3.Indicator: Color coded to show moisture content in ppm.

4.Minimum Moisture Indicator Sensitivity: Indicate moisture above 60 ppm.

5.End Connections: Socket or flare.

6.Working Pressure Rating: 500 psig (3450 kPa).

7.Maximum Operating Temperature: 240 deg F (116 deg C).

L.Replaceable-Core Filter Dryers: Comply with ARI 730.

Conbraco does not manufacture products complying with the requirements of this paragraph.

1.Body and Cover: Painted-steel shell with ductile-iron cover, stainless-steel screws, and neoprene gaskets.

2.Filter Media: 10 micron, pleated with integral end rings; stainless-steel support.

3.Desiccant Media: Activated [alumina] [charcoal].

Retain first subparagraph below for heat pumps.

4.Designed for reverse flow (for heat-pump applications).

5.End Connections: Socket.

Retain first subparagraph below for suction-line filter dryers.

6.Access Ports: NPS 1/4 (DN 8) connections at entering and leaving sides for pressure differential measurement.

7.Maximum Pressure Loss: [2 psig (14 kPa)] <Insert value>.

8.Rated Flow: <Insert tons (kW).>

9.Working Pressure Rating: 500 psig (3450 kPa).

10.Maximum Operating Temperature: 240 deg F (116 deg C).

M.Permanent Filter Dryers: Comply with ARI 730.

Conbraco does not manufacture products complying with the requirements of this paragraph.

1.Body and Cover: Painted-steel shell.

2.Filter Media: 10 micron, pleated with integral end rings; stainless-steel support.

3.Desiccant Media: Activated [alumina] [charcoal].

Retain first subparagraph below for heat pumps.

4.Designed for reverse flow (for heat-pump applications).

5.End Connections: Socket.

Retain first subparagraph below for suction-line filter dryers.

6.Access Ports: NPS 1/4 (DN 8) connections at entering and leaving sides for pressure differential measurement.

7.Maximum Pressure Loss: [2 psig (14 kPa)] <Insert value>.

8.Rated Flow: <Insert tons (kW).>

9.Working Pressure Rating: 500 psig (3450 kPa).

10.Maximum Operating Temperature: 240 deg F (116 deg C).

N.Liquid Accumulators: Comply with ARI 495.

Conbraco does not manufacture products complying with the requirements of this paragraph.

1.Body: Welded steel with corrosion-resistant coating.

2.End Connections: Socket or threaded.

3.Working Pressure Rating: 500 psig (3450 kPa).

4.Maximum Operating Temperature: 275 deg F (135 deg C).

2.3REFRIGERANTS

See Editing Instruction No. 1 in the Evaluations for cautions about naming manufacturers and products. Retain one of first two paragraphs and list of manufacturers below. See Division 01 Section "Product Requirements."

A.Available Manufacturers: Subject to compliance with requirements, manufacturers offering products that may be incorporated into the Work include, but are not limited to, the following:

B.Manufacturers: Subject to compliance with requirements, provide products by one of the following:

1.Atofina Chemicals, Inc.

2.DuPont Company; Fluorochemicals Div.

3.Honeywell, Inc.; Genetron Refrigerants.

4.INEOS Fluor Americas LLC.

5.<Insert manufacturer's name.>

C.ASHRAE 34, R-22: Monochlorodifluoromethane.

PART 3 - EXECUTION

3.1PIPING APPLICATIONS

Retain one or both paragraphs below. Retain first paragraph to require all piping to be Type ACR, annealed temper. Type ACR, annealed-temper tubing is available only in sizes NPS 1-1/2 (DN 40) and smaller. Retain second paragraph if pipe sizes exceed NPS 1-1/2 (DN 40) and it is desirable to have all piping be of same tube type and joining method. Retain both paragraphs to require piping larger than NPS 1-1/2 (DN 40) to be different than Type ACR, annealed temper. Delete both paragraphs if suction lines are part of a heat-pump installation.

A.Suction Lines [NPS 1-1/2 (DN 40) and Smaller] <Insert pipe size range> for Conventional Air-Conditioning Applications: Copper, Type ACR, annealed-temper tubing and wrought-copper fittings with [brazed] [or] [soldered] joints.

B.Suction Lines [NPS 4 (DN 100) and Smaller] [NPS 2 to NPS 4 (DN 50 to DN 100)] <Insert pipe size range> for Conventional Air-Conditioning Applications: Copper, Type [ACR] [L (B)], drawn-temper tubing and wrought-copper fittings with [brazed] [or] [soldered] joints.

Retain one of three paragraphs below. Retain first paragraph to require all piping to be Type ACR, annealed temper. Type ACR, annealed-temper tubing is available only in sizes NPS 1-1/2 (DN 40) and smaller. Retain second paragraph if pipe sizes exceed NPS 1-1/2 (DN 40) and it is desirable to have all piping be of same tube type and joining method. Retain third paragraph and subparagraphs to require different tube type and joining methods for various pipe sizes.

C.Hot-Gas and Liquid Lines[, and Suction Lines for Heat-Pump Applications]: Copper, Type ACR, annealed-temper tubing and wrought-copper fittings with [brazed] [or] [soldered] joints.

D.Hot-Gas and Liquid Lines[, and Suction Lines for Heat-Pump Applications]: Copper, Type [ACR] [K (A)] [L (B)], drawn-temper tubing and wrought-copper fittings with soldered joints.

E.Hot-Gas and Liquid Lines[, and Suction Lines for Heat-Pump Applications]:

Retain one of first two subparagraphs below.

1.[NPS 1-1/2 (DN 40) and Smaller] <Insert pipe size range>: Copper, Type ACR, annealed-temper tubing and wrought-copper fittings with [brazed] [or] [soldered] joints.

2.[NPS 1-1/2 (DN 40) and Smaller] <Insert pipe size range>: Copper, Type [ACR] [L (B)], drawn-temper tubing and wrought-copper fittings with [brazed] [or] [soldered] joints.

3.[NPS 2 to NPS 3 (DN 50 to DN 80)] <Insert pipe size range>: Copper, Type K (A), annealed- or drawn-temper tubing and wrought-copper fittings with [brazed] [or] [soldered] joints.

4.[NPS 4 (DN 100)] <Insert pipe size>: Copper, Type [ACR] [K (A)] [L (B)], drawn-temper tubing and wrought-copper fittings with soldered joints.

Retain first paragraph below to require all pipe sizes to be copper of same tube type and joining method. Retain second paragraph and subparagraphs to require different tube type and joining methods for various pipe sizes.

F.Safety-Relief-Valve Discharge Piping: Copper, Type [ACR] [K (A)] [L (B)], drawn-temper tubing and wrought-copper fittings with soldered joints.

G.Safety-Relief-Valve Discharge Piping:

Retain one of first two subparagraphs below.

1.[NPS 1-1/2 (DN 40) and Smaller] <Insert pipe size range>: Copper, Type ACR, annealed-temper tubing and wrought-copper fittings with [brazed] [or] [soldered] joints.

2.[NPS 1-1/2 (DN 40) and Smaller] <Insert pipe size range>: Copper, Type [ACR] [L (B)], drawn-temper tubing and wrought-copper fittings with brazed joints.

3.[NPS 2 to NPS 3 (DN 50 to DN 80)] <Insert pipe size range>: Copper, Type K (A), annealed- or drawn-temper tubing and wrought-copper fittings with [brazed] [or] [soldered] joints.

4.[NPS 4 (DN 100)] <Insert pipe size>: Copper, Type [ACR] [K (A)] [L (B)], drawn-temper tubing and wrought-copper fittings with soldered joints.

3.2VALVE AND SPECIALTY APPLICATIONS

Delete first paragraph below if valves are specified in Division 23 Section "Packaged Compressor and Condenser Units."

A.Install [diaphragm packless] [packed-angle] valves in suction and discharge lines of compressor.

B.Install service valves for gage taps at strainers if they are not an integral part of strainers.

Retain first paragraph below if suction line will be exposed to air temperatures less than 75 deg F (24 deg C) during compressor operation.

C.Install a check valve at the compressor discharge and a liquid accumulator at the compressor suction connection.

D.Except as otherwise indicated, install [diaphragm packless] [packed-angle] valves on inlet and outlet side of filter dryers.

Retain paragraph below only for systems that cannot be shut down for a short time to replace the filter dryer.

E.Install a full-sized, three-valve bypass around filter dryers.

Retain first paragraph below for solenoid valves on systems with multiple thermostatic expansion valves.

F.Install solenoid valves upstream from each expansion valve. Install solenoid valves in horizontal lines with coil at top.

G.Install thermostatic expansion valves as close as possible to distributors on evaporators.

1.Install valve so diaphragm case is warmer than bulb.

In first subparagraph below, verify proper location for bulb with valve manufacturer.

2.Secure bulb to clean, straight, horizontal section of suction line using two bulb straps. Do not mount bulb in a trap or at bottom of the line.

3.If external equalizer lines are required, make connection where it will reflect suction-line pressure at bulb location.

H.Install safety relief valves where required by ASME Boiler and Pressure Vessel Code. Pipe safety-relief-valve discharge line to outside according to ASHRAE 15.

I.Install moisture/liquid indicators in liquid line at the inlet of the thermostatic expansion valve or at the inlet of the evaporator coil capillary tube.

J.Install strainers upstream from and adjacent to the following unless they are furnished as an integral assembly for device being protected:

Edit list below for equipment required for Project.

1.Solenoid valves.

2.Thermostatic expansion valves.

3.Compressor.

K.Install filter dryers in liquid line between compressor and thermostatic expansion valve[, and in the suction line at the compressor].

See Evaluations for discussion of flexible connectors.

L.Install flexible connectors at compressors.

3.3PIPING INSTALLATION

A.Drawing plans, schematics, and diagrams indicate general location and arrangement of piping systems; indicated locations and arrangements were used to size pipe and calculate friction loss, expansion, pump sizing, and other design considerations. Install piping as indicated unless deviations to layout are approved on Shop Drawings.

B.Install refrigerant piping according to ASHRAE 15.

C.Install piping in concealed locations unless otherwise indicated and except in equipment rooms and service areas.

D.Install piping indicated to be exposed and piping in equipment rooms and service areas at right angles or parallel to building walls. Diagonal runs are prohibited unless specifically indicated otherwise.

E.Install piping above accessible ceilings to allow sufficient space for ceiling panel removal.

F.Install piping adjacent to machines to allow service and maintenance.

G.Install piping free of sags and bends.

H.Install fittings for changes in direction and branch connections.

I.Select system components with pressure rating equal to or greater than system operating pressure.

J.Refer to Division 23 Sections "Instrumentation and Control for HVAC" and "Sequence of Operations for HVAC Controls" for solenoid valve controllers, control wiring, and sequence of operation.

K.Install piping as short and direct as possible, with a minimum number of joints, elbows, and fittings.

L.Arrange piping to allow inspection and service of refrigeration equipment. Install valves and specialties in accessible locations to allow for service and inspection. Install access doors or panels as specified in Division 08 Section "Access Doors and Frames" if valves or equipment requiring maintenance is concealed behind finished surfaces.

M.Install refrigerant piping in protective conduit where installed belowground.

N.Install refrigerant piping in rigid or flexible conduit in locations where exposed to mechanical injury.

O.Slope refrigerant piping as follows:

See Evaluations for discussion of oil entrainment. Refer to the 2002 ASHRAE HANDBOOK - "Refrigeration" for discussion of methods for managing oil entrainment in refrigerant gas and liquid.

1.Install horizontal hot-gas discharge piping with a uniform slope downward away from compressor.

2.Install horizontal suction lines with a uniform slope downward to compressor.

Use double-suction riser for maximum compressor efficiencies if load variation is expected.

3.Install traps and double risers to entrain oil in vertical runs.

4.Liquid lines may be installed level.

P.When brazing or soldering, remove solenoid-valve coils and sight glasses; also remove valve stems, seats, and packing, and accessible internal parts of refrigerant specialties. Do not apply heat near expansion-valve bulb.

Q.Install pipe sleeves at penetrations in exterior walls and floor assemblies.

R.Seal penetrations through fire and smoke barriers according to Division 07 Section "Penetration Firestopping."

S.Install piping with adequate clearance between pipe and adjacent walls and hangers or between pipes for insulation installation.

T.Install sleeves through floors, walls, or ceilings, sized to permit installation of full-thickness insulation.

U.Seal pipe penetrations through exterior walls according to Division 07 Section "Joint Sealants" for materials and methods.

V.Identify refrigerant piping and valves according to Division 23 Section "Identification for HVAC Piping and Equipment."

3.4PIPE JOINT CONSTRUCTION

A.Soldered Joints: Construct joints according to ASTM B 828 or CDA's "Copper Tube Handbook."

B.Brazed Joints: Construct joints according to AWS's "Brazing Handbook," Chapter "Pipe and Tube."

1.Use Type BcuP, copper-phosphorus alloy for joining copper socket fittings with copper pipe.

2.Use Type BAg, cadmium-free silver alloy for joining copper with bronze or steel.

3.5HANGERS AND SUPPORTS

Piping hangers and supports must accommodate expansion and contraction, vibration, dead load of piping and its contents, and seismic-bracing requirements.

A.Hanger, support, and anchor products are specified in Division 23 Section "Hangers and Supports for HVAC Piping and Equipment."

B.Install the following pipe attachments:

1.Adjustable steel clevis hangers for individual horizontal runs less than 20 feet (6 m) long.

2.Roller hangers and spring hangers for individual horizontal runs 20 feet (6 m) or longer.

3.Pipe Roller: MSS SP-58, Type 44 for multiple horizontal piping 20 feet (6 m) or longer, supported on a trapeze.

4.Spring hangers to support vertical runs.

5.Copper-clad hangers and supports for hangers and supports in direct contact with copper pipe.

C.Install hangers for copper tubing with the following maximum spacing and minimum rod sizes:

Verify actual supported loads for hanger sizes and spacing. Consult structural engineer. Spacing and sizes in subparagraphs below are from the 2000 ASHRAE HANDBOOK - "HVAC Systems and Equipment."

1.NPS 1/2 (DN 15): Maximum span, 60 inches (1500 mm); minimum rod size, 1/4 inch (6.4 mm).

2.NPS 5/8 (DN 18): Maximum span, 60 inches (1500 mm); minimum rod size, 1/4 inch (6.4 mm).

3.NPS 1 (DN 25): Maximum span, 72 inches (1800 mm); minimum rod size, 1/4 inch (6.4 mm).

4.NPS 1-1/4 (DN 32): Maximum span, 96 inches (2400 mm); minimum rod size, 3/8 inch (9.5 mm).

5.NPS 1-1/2 (DN 40): Maximum span, 96 inches (2400 mm); minimum rod size, 3/8 inch (9.5 mm).

6.NPS 2 (DN 50): Maximum span, 96 inches (2400 mm); minimum rod size, 3/8 inch (9.5 mm).

7.NPS 2-1/2 (DN 65): Maximum span, 108 inches (2700 mm); minimum rod size, 3/8 inch (9.5 mm).

8.NPS 3 (DN 80): Maximum span, 10 feet (3 m); minimum rod size, 3/8 inch (9.5 mm).

9.NPS 4 (DN 100): Maximum span, 12 feet (3.7 m); minimum rod size, 1/2 inch (13 mm).

D.Support multifloor vertical runs at least at each floor.

3.6FIELD QUALITY CONTROL

A.Perform tests and inspections and prepare test reports.

B.Tests and Inspections:

1.Comply with ASME B31.5, Chapter VI.

2.Test refrigerant piping and specialties. Isolate compressor, condenser, evaporator, and safety devices from test pressure if they are not rated above the test pressure.

3.Test high- and low-pressure side piping of each system separately at not less than the pressures indicated in Part 1 "Performance Requirements" Article.

a.Fill system with nitrogen to the required test pressure.

b.System shall maintain test pressure at the manifold gage throughout duration of test.

c.Test joints and fittings with electronic leak detector or by brushing a small amount of soap and glycerin solution over joints.

d.Remake leaking joints using new materials, and retest until satisfactory results are achieved.

3.7SYSTEM CHARGING

A.Charge system using the following procedures:

1.Install core in filter dryers after leak test but before evacuation.

2.Evacuate entire refrigerant system with a vacuum pump to 500 micrometers (67 Pa). If vacuum holds for 12 hours, system is ready for charging.

3.Break vacuum with refrigerant gas, allowing pressure to build up to 2 psig (14 kPa).

4.Charge system with a new filter-dryer core in charging line.

3.8ADJUSTING

Retain first paragraph below for adjustable thermostatic expansion valves.

A.Adjust thermostatic expansion valve to obtain proper evaporator superheat.

B.Adjust high- and low-pressure switch settings to avoid short cycling in response to fluctuating suction pressure.

C.Adjust set-point temperature of air-conditioning or chilled-water controllers to the system design temperature.

D.Perform the following adjustments before operating the refrigeration system, according to manufacturer's written instructions:

1.Open shutoff valves in condenser water circuit.

2.Verify that compressor oil level is correct.

3.Open compressor suction and discharge valves.

4.Open refrigerant valves except bypass valves that are used for other purposes.

5.Check open compressor-motor alignment and verify lubrication for motors and bearings.

E.Replace core of replaceable filter dryer after system has been adjusted and after design flow rates and pressures are established.

END OF SECTION 232300





REFRIGERANT PIPING

232300 -




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This Product MasterSpec Section modifies the original MasterSpec text, and does not include the full content of the original MasterSpec Section iconThis rich text version does not include all images. For a full version please view the pdf

This Product MasterSpec Section modifies the original MasterSpec text, and does not include the full content of the original MasterSpec Section iconThis rich text version does not include all images. For a full version please view the pdf

This Product MasterSpec Section modifies the original MasterSpec text, and does not include the full content of the original MasterSpec Section iconThis rich text version does not include all images. For a full version please view the pdf

This Product MasterSpec Section modifies the original MasterSpec text, and does not include the full content of the original MasterSpec Section iconSection-a english Literature from Chaucer to 1900 (covering trends, movements, major authors and texts) Section-B

This Product MasterSpec Section modifies the original MasterSpec text, and does not include the full content of the original MasterSpec Section iconNote: Hidden text with instructions can be viewed by clicking “Tools”, “Options”, “View” tab then checking “Hidden text” and “All” in the section “Non-printing characters. Please delete this notation after you have read the instructions

This Product MasterSpec Section modifies the original MasterSpec text, and does not include the full content of the original MasterSpec Section iconA fruitful year of 2010 has been experienced by ieee taipei Section. Efforts have been made to elevate the section to the next level. The membership count is

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