\* \* \* \* \* \* \* \* \* \*

READ AND **REMOVE THIS PAGE** BEFORE PLACING

THE SPECIFICATION SECTION IN THE CONTRACT

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[DIVISION 15: MECHANICAL]{.underline}

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]{.underline}, **boldface**,
and *italics*, within the paragraphs; and this page. (Open Reveal Codes
\[alt F3\] to do this accurately.)

D. [To Edit "(Footer B)":]{.underline} (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]{.underline}

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]{.underline}

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]{.underline}

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]{.underline}

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]{.underline}

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]{.underline}

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