USACE / NAVFAC / AFCESA / NASA UFGS-13 21 26 (April 2006) ------------------------------ Preparing Activity: NAVFAC Replacing without change UFGS-13038 (August 2001) UNIFIED FACILITIES GUIDE SPECIFICATIONS References are in agreement with UMRL dated January 2009 SECTION 13 21 26 COLD-STORAGE ROOMS (PREFABRICATED PANEL TYPE) 04/06 NOTE: This guide specification covers the requirements for requirements for walk-in refrigerators and freezers. Edit this guide specification for project specific requirements by adding, deleting, or revising text. For bracketed items, choose applicable items(s) or insert appropriate information. Remove information and requirements not required in respective project, whether or not brackets are present. Comments and suggestions on this guide specification are welcome and should be directed to the technical proponent of the specification. A listing of technical proponents, including their organization designation and telephone number, is on the Internet. Recommended changes to a UFGS should be submitted as a Criteria Change Request (CCR). NOTE: Lighting and refrigeration equipment are included in this guide specification. NOTE: Indicate the following information on the project drawings for each cold storage room: 1. Configuration and dimensions (width, length, and height). 2. Sections showing floor construction, including details through door openings. Design floors for food service facilities with prefabricated floor sections in depressed pad with quarry tile finish. Experience has shown that this type of floor construction should be used in walk-in refrigerated rooms. 3. Sections showing supporting steel for ceiling panels if required for the project. 4. Details of shelves. 5. Details and location of light fixtures. 6. Location of refrigeration equipment. 7. Storage temperature, cooler capacity, evaporator air flow rate, and evaporator temperature. 8. Electrical characteristics for lights, condensing units, and evaporators. PART 1 GENERAL 1.1 REFERENCES NOTE: This paragraph is used to list the publications cited in the text of the guide specification. The publications are referred to in the text by basic designation only and listed in this paragraph by organization, designation, date, and title. Use the Reference Wizard's Check Reference feature when you add a RID outside of the Section's Reference Article to automatically place the reference in the Reference Article. Also use the Reference Wizard's Check Reference feature to update the issue dates. References not used in the text will automatically be deleted from this section of the project specification when you choose to reconcile references in the publish print process. The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only. AIR-CONDITIONING, HEATING AND REFRIGERATION INSTITUTE (AHRI)AHRI 365(2002) Commercial and Industrial Unitary Air-Conditioning Condensing UnitsAHRI 420(2000) Unit Coolers for RefrigerationNSF INTERNATIONAL (NSF)NSF 7(2007) Commercial Refrigerators and FreezersU.S. DEPARTMENT OF DEFENSE (DOD)MIL-R-43900(Rev B; Notice 1; CANC Notice 2) Refrigerators, Freezers, Prefabricated, Mechanical, Commercial, Walk-InU.S. GENERAL SERVICES ADMINISTRATION (GSA)FS A-A-52128(Basic) Shelving, Storage, Stationary and Mobile, Food StorageUNDERWRITERS LABORATORIES (UL)UL 1995(2005) Standard for Heating and Cooling EquipmentUL 412(2004; Rev thru Jan 2009) Refrigeration Unit CoolersUL 427(2006) Refrigerating Units1.2 SUBMITTALS NOTE: Review submittal description (SD) definitions in Section 01 33 00 SUBMITTAL PROCEDURES and edit the following list to reflect only the submittals required for the project. Submittals should be kept to the minimum required for adequate quality control. A “G” following a submittal item indicates that the submittal requires Government approval. Some submittals are already marked with a “G”. Only delete an existing “G” if the submittal item is not complex and can be reviewed through the Contractor’s Quality Control system. Only add a “G” if the submittal is sufficiently important or complex in context of the project. For submittals requiring Government approval on Army projects, a code of up to three characters within the submittal tags may be used following the "G" designation to indicate the approving authority. Codes for Army projects using the Resident Management System (RMS) are: "AE" for Architect-Engineer; "DO" for District Office (Engineering Division or other organization in the District Office); "AO" for Area Office; "RO" for Resident Office; and "PO" for Project Office. Codes following the "G" typically are not used for Navy, Air Force, and NASA projects. Choose the first bracketed item for Navy, Air Force and NASA projects, or choose the second bracketed item for Army projects. Government approval is required for submittals with a "G" designation; submittals not having a "G" designation are [for Contractor Quality Control approval.][for information only. When used, a designation following the "G" designation identifies the office that will review the submittal for the Government.] The following shall be submitted in accordance with Section 01 33 00 SUBMITTAL PROCEDURES: _{SD-02 Shop Drawings Cold-storage rooms SD-03 Product Data Cold-storage rooms Shelves Refrigeration equipment SD-06 Test Reports} Start-up and initial operational _{tests SD-08 Manufacturer's Instructions Cold-storage rooms Refrigeration equipment} Include equipment start-up and initial operation. Include evacuation and charging procedures for refrigeration equipment. _{SD-10 Operation and Maintenance Data Cold-storage rooms}, Data Package 1[; _G][; _{G, [_____]}] _{Refrigeration equipment}, Data Package 2[; _G][; _{G, [_____]}] Submit in accordance with Section 01 78 23 OPERATION AND MAINTENANCE DATA. _{SD-11 Closeout Submittals} Posted _{operating instructions} for refrigeration equipment 1.3 REFRIGERATION PIPING NOTE: Insert appropriate Section number and title in blank below using format per UFC 1-300-02. Provide as specified under [_____]. PART 2 PRODUCTS 2.1 _{COLD-STORAGE ROOMS} NOTE: Select the appropriate type, size, and style from the latest edition of MIL-R-43900. MIL-R-43900, factory-fabricated type with the following requirements: a. Type [_____] b. Size [_____] c. Style [_____] d. Entrance doors shall be [swing] [sliding] type with [right-handed] [left-handed] openings. e. Refrigeration systems shall be the [remote] [self-contained] type. f. Electrical characteristics as indicated. g. Preservation and packing shall be commercial grade. h. Provide recording thermometer. i. Provide temperature alarm system [with connector for remote temperature alarm]. j. Provide interior lighting. [k. Provide outdoor weather cap.] [l. Provide outdoor condensing unit cover.] [m. Provide strip curtains.] n. Provide condensing unit outdoor controls for operation down to [_____] degrees C F ambient temperature. 2.2 _SHELVES FS A-A-52128, stationary type, slotted shelves, stainless steel construction, 450 to 500 mm 18 to 20 inches front to rear, by 1200 mm 48 inches long, by 1470 to 1680 mm 58 to 66 incheshigh, except as indicated otherwise. Preproduction samples are not required. 2.3 _{REFRIGERATION EQUIPMENT} MIL-R-43900, except as modified in this section. Refrigerant equipment shall be designed for [remote] [self-contained] installation. Design units for 16 to 18 hour operation at the indicated interior temperature in [_____] degrees C F ambient temperature. Capacities, air delivery, and dimensions shall be as indicated. 2.3.1 Remote Condensing Units Factory-fabricated and rated in accordance with UL 1995 and AHRI 365. Provide with motor, [air-cooled] [water-cooled] condenser, receiver, compressors, mounted on a common base. Compressors shall be [hermetic] [accessible-hermetic] type. 2.3.2 Evaporators Factory-fabricated and rated in accordance with UL 412 and AHRI 420. Forced-convection, unit-cooler type, made to be suspended from the ceiling panels, with forced-air discharged parallel to the ceiling. Provide with air circulating motor, multifin tube-type coil and grille assembled within a protective housing. Air circulation motors shall be lifetime sealed, and the entire unit-cooler assembly shall be accessible for cleaning. Provide a drip pan and drain connection. When the cold storage room is used for freezing, provide an automatic [hot-gas] [electric heat] defrosting system. Provide [timer] [demand] type defrost controllers. 2.3.3 Self-Contained Refrigerant Systems NOTE: Select mounting. Side-mounted units are available in sizes up to 6 kW 7 1/2 horsepower. Top-mounted units are available in sizes up to 4 kW 5 horsepower . Factory-fabricated in accordance with UL 427 for [side-wall] [top-wall] mounting. Systems shall include a condensing unit mounted on the exterior and a forced air evaporator mounted on the interior directly opposite. 2.4 HEATING CABLE NOTE: The following paragraph is for units operating at below-freezing temperatures. Provide condensate drain lines and drains below freezer floors with electric heating cable, thermostatically controlled to maintain [_____] degrees C F at zero flow rate. Cable shall be size [_____] to provide [_____] watts per meter linear foot. PART 3 EXECUTION 3.1 INSTALLATION Installation procedures shall conform to NSF 7, and the manufacturer's instructions. Submit a set of instructions covering both assembly of the rooms and installation of the refrigeration equipment before starting installation. 3.2 MANUFACTURER'S FIELD SERVICES Furnish manufacturer's representatives who are trained to perform the services specified. The representatives shall furnish and services on the following matters: a. Erection, alignment, and testing. b. Charging equipment with refrigerant and oil. c. Starting equipment and training government personnel as to its proper care, operation, and maintenance. 3.3 _TESTS Perform the tests for each room and provide everything required. Notify the Contracting Officer 10 days before performing the tests. Tests shall be performed in the presence of a manufacturer's representative. 3.3.1 Start-Up and Operational Tests Start up and initially operate the systems upon completion of the installation of the equipment and refrigerant piping. Adjust the safety and automatic controls to place them in operation and sequence. Record manufacturer's recommended readings hourly. Operational tests shall cover a period of not less than 24 hours. 3.3.2 Performance Tests Upon completion of the operational tests the systems shall be performance tested. Test duration shall not be less than 8 hours. Tests shall include the following information to be in the report with conclusions regarding the adequacy of the systems: a. Time, dates and duration of tests. b. Inside dry-bulb and wet-bulb temperatures maintained in each room during the tests employing recording instruments calibrated before the tests. c. Outside dry-bulb and wet-bulb temperatures obtained from recording instruments calibrated and checked hourly with a sling psychrometer. d. Evaporator and condenser entering and leaving temperatures taken hourly with the compressors in operation. e. The make, model and capacity of each evaporator and condensing unit. f. Voltmeter and ammeter readings for condensing units and evaporators. 3.4 _{OPERATING INSTRUCTIONS} Provide a framed and glassed control chart indicating a layout of the refrigeration systems, including piping, valves, wiring, and control mechanisms. Install control chart where directed. Submit printed instructions covering the maintenance and operation of refrigeration equipment. Tag shutoff valves in accordance with the printed instructions. Provide special tools as necessary for repair and maintenance of the equipment. 3.5 CLEANING Remove masking-protection from stainless steel and other finished surfaces. Wash and clean floors, walls, shelves, and ceilings inside rooms and exposed surfaces on the outside. Clean glass, fixtures and fittings. 3.6 INSTRUCTING OPERATING PERSONNEL Upon completion of the work and at a time designated by the Contracting Officer, provide for the instruction of Government personnel in the operation and maintenance of each refrigeration system. The period of instruction shall be for not less than one 8-hour working day.