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READ AND REMOVE THIS PAGE BEFORE PLACING
THE SPECIFICATION SECTION IN THE CONTRACT

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DIVISION 15:  MECHANICAL

SECTION 15535 ‑ REFRIGERANT SPECIALTIES

USE:	Furnishing and installing refrigerant accessories.

NOTES TO SPECIFIER:

	A.	Options within paragraphs are identified by enclosure in brackets; blank spaces enclosed by brackets [_____] provide for information to be inserted, as appropriate, to individual projects.

	B.	TO AVOID CONFLICTING REQUIREMENTS AND COSTLY MISTAKES, the specifier must edit (delete, substitute or add to the text).  The remaining paragraphs must be renumbered.

	C.	DELETE FOR FINAL COPY: Notes to the Specifier, located between lines of asterisks; all [brackets], underlining, boldface, and italics, within the paragraphs; and this page.  (Open Reveal Codes [alt F3] to do this accurately.)

	D.	To Edit “(Footer B)”: (Corel 8).  ENTIRE FOOTER SHOULD BE BOLDED.  Click in the footer and delete the “Project Name (ftr B)” text and replace it with the Name of the Project (upper and lower case).  Replace date with current MM/YY (WITHOUT BRACKETS).

	E.	The Guide Specifications are intended to be continuously reviewed and revised.  User’s technical comments are appreciated.  Also, other related or similar specification that are written “from scratch” that could benefit others, or other questions can be sent to NSTC A/E Group, ST 110, or call (303) 987-6868.

DRAWING DATA REQUIRED: 

REQUIRED SPEC MODIFICATIONS:

GENERAL NOTES

A.	Whenever entire articles, paragraphs or subparagraphs are not applicable, the articles, paragraphs or subparagraphs should be deleted; when necessary, reletter or renumber articles, paragraphs or subparagraphs.

B.	THIS GUIDE IS NOT INTENDED AS A SUBSTITUTE FOR READING THE ENTIRE SECTION.

TECHNICAL NOTES

A.	1.1B:  Select or add applicable specification sections.  Do not list specification sections from Division 15.

B.	1.2:  Select or add applicable references.

C.	1.3B:  Insert number of copies of the manufacturer's descriptive data required.  Normally 5 copies are required.  Distribution after review is normally 1 copy to the COR, 3 copies to the Contractor, and 1 copy to the project file.

D.	1.3C:  Insert number of copies of the manufacturer's installation instructions required.  Normally 5 copies are required.  Distribution after review is normally 1 copy to the COR, 3 copies to the Contractor, and 1 copy to the project file.

E.	4.1 and 4.2:  When a "lump sum" Contract is used, delete the title PART 4:  MEASUREMENT AND PAYMENT, and both articles from this section.  Measurement and payment will be addressed in Part 4 of Section 01010 - Summary of Work.

REVISIONS OF THIS SECTION:
CSI format, editorial changes: 12/01
Metric:  
Technical Update: 02/91

SECTION 15535

REFRIGERANT SPECIALITIES

PART 1:  GENERAL

1.1  SUMMARY:

	A.	Section Includes:  Furnishing and installing refrigerant accessories and related appurtenances for refrigerant air conditioning systems when not furnished by the manufacturer as part of the equipment.

1.2  REFERENCES:

	A.  Federal Specifications:
	Fed. Spec. 00‑A‑373C	Air Conditioners, Single Package Type or Evaporative‑Cooled
	Fed. Spec. 00‑A‑374A	Air Conditioner with Remote Condensing Units or Remote Air‑Cooled and Water‑Cooled Condenser Units, Unitary

	B.  Military Specifications:
	Mil. Spec. H‑22547B	Heat Pumps, Heating and Cooling (Unitary) (8400 to 300,000 BTU)

1.3  SUBMITTALS:

	A.	Requirements:  Submittals shall be according to Section 01300 - Submittals.

	B.	Manufacturer's Literature:  Submit [____] copies of the manufacturer's descriptive data for the refrigerant specialties to be used on this project.

	C.	Installation Instructions:  Submit [____] copies of the manufacturer's installation instructions for the refrigerant specialties to be used on this project.

PART 2:  PRODUCTS

2.1  MATERIALS:

	A.	Sizes and Capacities:  The size and capacity of refrigerant accessories will be as shown on the drawings or as called out below under the specific heading of the product.

2.2  ACCESSORIES:

	A.	Sight Glass Liquid Indicators:  Double port type with copper or brass body, and flared or solder ends.  Provide removable seal caps on each port for inspection of refrigerant condition.  Provide full size liquid indicators in main liquid line leaving the condenser.  If a receiver is used, install in liquid line leaving the receiver.

B.	Strainers:  Angle type with brass shell and replaceable cartridge.  Provide full size strainer ahead of each automatic valve.  Where multiple expansion valves with integral strainers are used, install single main liquid line strainer.  On steel piping systems provide strainer in suction line to remove scale and rust.  Provide shut‑off valve on each side of strainer to facilitate maintenance.
	C.	Refrigerant Driers:  In‑line or angle type with copper or brass shell.  Employ replaceable desiccant drier material.  Provide full flow permanent refrigerant drier in low temperature systems and systems utilizing hermetic compressor.  Provide three‑valve by‑pass assembly.

	D.	Filter‑Driers:  Angle type, with brass shell and using combined straining and drying material.  Employ replaceable desiccant material.  Acceptable in lieu of separate strainers and dryers.  Provide three‑valve by‑pass assembly.

	E.	Solenoid Valves:  Copper or brass body with flared or threaded ends.  Use replaceable coil assembly.  Provide a manually operated stem to permit operation in case of coil failure.  Provide solenoid valves in liquid lines of systems operating with single pump‑out or pump‑down compressor control, in liquid line of single or multiple evaporator systems, and in oil bleeder lines from flooded evaporators to stop flow of oil and refrigerant into the suction line when system shuts down.

	F.	Expansion Valves:  Angle type or straight-through design suitable for the refrigerant utilized in the system.  Brass body, internal or external equalizer, and adjustable superheat setting, complete with capillary tube and remote sensing bulb.  Expansion valve size to avoid being undersized at full load and excessively oversized at partial load.  Evaluate refrigerant pressure drop through system to determine the available pressure drop across each valve.  Valves shall be selected for maximum load at design operating pressure and minimum 43 degrees F of superheat.

	G.	Charging Valves:  General purpose type with brass body, flared or solder ends, and removable valve core.  Provide valve inlet with quick coupling connection for ease of charging.  Provide refrigerant charging connections in liquid line between receiver shut‑off valve and expansion valve.

	H.	Flexible Connectors:  Close-pitch corrugated bronze hose with single layer of exterior braiding.  At least 9 inches long with bronze fittings.  Utilize only at or near compressors where it is not physically possible to absorb vibration within piping configuration.

PART 3:  EXECUTION

3.1  INSTALLATION:

	A.	General:  Install refrigerant accessories in accordance with the manufacturer's recommendations and instructions.

	B.	Refrigerant Driers:  Mount drier vertically in liquid line adjacent to receiver with by‑pass assembly to permit isolation of drier for servicing.

	C.	Filter‑Driers:  Install with by‑pass assembly to permit isolation for servicing.

	D.	Expansion Valve:  Locate expansion valve sensing bulb immediately after the evaporator outlet on suction line and at 45 degrees from horizontal.

	E.	Strainers:  Shall be installed ahead of and close to expansion or solenoid stop valves.

PART 4:  MEASUREMENT AND PAYMENT

4.1  METHOD OF MEASUREMENT:

A.	ab	Units:  The work described in this section will not be measured for payment.

4.2  BASIS OF PAYMENT:

	A.	Payment:  No direct payment for the work described under this section will be made.  The Contractor shall include consideration for this item in the bid price for other items of the Contract.

END OF SECTION

REFRIGERANT SPECIALITIES
12/01
Project Name (ftr B)