Minneapolis Public Schools



SECTION 11 41 23COLD STORAGE ROOMS - GENERALSUMMARYSection Includes:Provide pre-engineered walk-in cooler and walk-in freezer cold storage room(s) in sizes noted on Drawings.Pump down existing refrigeration system. Disconnect system. Remove piping and associated components. Remove compressor/condensing unit(s) and evaporator(s) and relocate to location within the School District as directed by the Owner. Reclaim refrigerant. Provide EPA approved certification for qualified refrigerant recovery technician. Provide a “Statement of Refrigeration Recovery” signed by refrigerant recovery technician responsible for recovering refrigerant, stating that all refrigerant that was present was recovered and that recovery was performed according to EPA regulations. Include name and address of technician and date refrigerant was recovered.Provide compressor/condenser, evaporator, and related accessories for cold storage room(s).Provide necessary controls and miscellaneous refrigerating items necessary for a complete automatic installation, including solenoids, starters or contactors, filters, dryers, and expansion valves.Provide closure panels and related steel angle support framing which close off between top of cold storage room(s) and ceiling on exposed sides. Closure panel material shall match adjacent cold storage room wall pressors/condensers to be located on roof securely anchored to roof rails.Provide closure trim to close off between walls on cold storage room(s) and adjacent wall surfaces. Closure trim material shall match adjacent cold storage room wall material.Provide stainless steel coved base.Provide required piping (including sleeves or core drilling through mezzanine or concrete floor above), wiring, controls, conduit, and accessories between compressor/condenser units and evaporators. Provide wiring between compressor/condenser units and power source in general area. Provide condensate piping between evaporators and condensate floor drain. Provide escutcheons at utility penetrations through panels. Piping sleeve, if required, to pass through walls by Masonry Contractor.Provide a 10 mil polyethylene sheet vapor barrier between concrete subfloor and cold storage room floor panels.Provide grout filler at exposed perimeter of floor panels.Provide LED lamps compatible with specified light fixtures.Provide penetration in cooler and freezer for temperature monitor probe with associated piping (by Temperature Control Contractor). Coordinate penetration size and location with Temperature Control Contractor.Work By Other Contractors:Electrical Contractor:Electrical Contractor shall bring 120/60/1 power to a terminal box at top of each unit for unit lights, heater tape for freezer condensate piping, and door section electrical requirements.Electrical Contractor shall bring 208/60/1 power for freezer and 120/60/1 power for cooler, through a disconnect switch, to evaporators in each unit.Electrical Contractor shall provide 208/60/3 power, through a disconnect switch, in general area of each compressor/condenser assembly.SYSTEM DESCRIPTIONDesign Requirements For Freezer Refrigeration System: Design freezer refrigeration system for a minus 10-degree F operating temperature with maximum 20-hour running time at 95-degree F ambient temperature using Dupont HP-62 or ASHRAE 404A refrigerant, for average usage and product load.Design Requirements For Cooler Refrigeration System: Design cooler refrigeration system for plus 35-degree F operating temperature with maximum 18-hour running time at 95-degree F ambient temperature using Dupont HP-62 or ASHRAE 404A refrigerant, for average usage and product load.SUBMITTALSGeneral Requirements: Provide submittals in accordance with Section 01 33 00, unless otherwise indicated.Shop Drawings: Indicate on Shop Drawings, layout, room dimensions, materials, components, fasteners, doors, hardware, equipment, finishes, method of installation and assembly, supplementary support or bracing, controls, and services roughing-in.Contract Closeout Submittals:Provide in accordance with Section 01 77 00.Record Documents: Upon completion of work, Food Service Equipment Contractor shall provide, to Architect, who will forward to Owner, a completely updated set of Shop Drawings, including details and electrical and mechanical information on items as provided.Operating Instructions: Food Service Equipment Contractor shall provide on-site instructions for operation and maintenance of equipment. Owner will designate dates and personnel to receive instructions. Provide to Architect, Owner’s signature stating they have been instructed in proper use and maintenance schedule to be followed for scheduled equipment.Manufacturer's Maintenance and Operating Literature: Upon completion of work, Food Service Equipment Contractor shall prepare, in triplicate or as many copies as required, and submit to Architect, who will forward to Owner, relating to the items furnished, specification sheets, operation instructions, maintenance instructions, and list of parts recommended for Owner to stock. This information shall be provided on all such items as information is available from manufacturer.Binding and Submitting Instructions: Literature, drawings, and data shall be bound in a 3-ring, loose-leaf, hard cover, plastic faced portfolio. Contractor shall submit portfolio, complete with all its contents, to Architect for approval.Binding and Submitting Instructions: Refer to Section 01 77 00 for requirements.QUALITY ASSURANCERegulatory Requirements:NSF International Requirements: Complete units and installation shall meet NSF International requirements.Underwriters’ Laboratories (UL) Requirements: Complete units and installation, including refrigeration systems, shall be UL approved. Insulation shall be self-extinguishing, fire retardant type with UL plete units and installation, including refrigeration systems, shall be in accordance with Energy Independence and Security Act of 2007.Installer Qualifications:Installation of cold storage room(s) to be performed only by an authorized representative of manufacturer who is familiar with manufacturer's installation requirements and experienced with installation of manufacturer's product.Manufacturer of cold storage room(s) to be held responsible for proper installation and operation of manufacturer's product.DELIVERY, STORAGE, AND HANDLINGPacking and Shipping:Do not deliver materials or assemblies to site until installation spaces are ready to receive units.Wrap and crate finished components and assemblies at factory to prevent damage or marring of surfaces during shipping and handling.WARRANTYCold Storage Room Warranty:Manufacturer to warrant that installed cold storage rooms are free from defects in material and workmanship under normal use and service for a period of 10 years from date of Substantial Completion. Manufacturer to be obligated to repair or replace panels which prove defective within warranty period.Manufacturer to warrant that installed accessories to cold storage room panels are free from defects in material and workmanship under normal use and service for a period of 1 year from date of Substantial Completion. Manufacturer to be obligated to repair or replace accessories which prove defective within warranty period.Cold storage room installer to be obligated to repair or replace equipment which fails due to faulty installation for a period of 1 year from date of Substantial Completion.Refrigeration System Warranty:Manufacturer to warrant that refrigeration components are free from defects in materials and workmanship under normal use and service for a period of 1 year from date of Substantial Completion. Manufacturer to be obligated to repair or replace equipment which proves defective within warranty period.Manufacturer to warrant that the compressor(s) are free from defects in material and workmanship under normal use and service for an extended period of 5 years from date of Substantial Completion. Manufacturer to be obligated to replace equipment which proves defective within warranty period.Refrigeration Installing Subcontractor to provide a 1 year parts and labor warranty on the entire refrigeration system under normal use and service from date of Substantial Completion. Installer to be obligated to repair or replace equipment which fails due to faulty installation within warranty period.Refrigeration Maintenance Warranty:Provide a 1-year maintenance warranty which includes quarterly maintenance visits. - PRODUCTSMANUFACTURERSAcceptable Manufacturers: Subject to compliance with requirements of the Contract Documents, acceptable manufacturers are as follows or Owner approved equal:Kolpak, Parsons, TNNor-Lake, Inc., Hudson, WIThermalrite, Ontario, CAREFRIGERATION EQUIPMENTAcceptable Manufacturers For Compressor/Condenser: Subject to compliance with requirements of the Contract Documents, acceptable manufacturers are as follows, no substitutions:Copeland Corporation, Sidney, OHAcceptable Manufacturers For Evaporators: Subject to compliance with requirements of the Contract Documents, acceptable manufacturers are as follows, no substitutions:Heatcraft Refrigeration Products, Model:BohnChandlerClimate ControlLarkinDescription:Refrigeration system to be an exterior remote system located where noted on Drawings and include necessary components factory installed on both evaporator and condensing units.Evaporator and condensing units to be prewired so only work required at site shall be to make electrical and tubing connections between these assemblies.Electrical conduit, wiring, and refrigeration tubing required between evaporator and condensing units shall be furnished and installed by cold storage room installer.Condensing Units:Design refrigeration equipment for an exterior remote installation, fully automatic in operation.Condensing unit assembly shall include, in addition to condensing unit, a sight glass, time clock, vibration eliminator, suction accumulator, dryer, and pressure control.Condensing units shall be air cooled and provided with PSC motor, automatic load controls and safety controls, receiver, compressor, and other necessary components, mounted in a flexible manner on a common pressor(s) shall be scroll type with synthetic oil.Evaporators:Evaporators shall be forced air circulation, unit-cooler type, made to be suspended from ceiling sections and arranged so that cooled air is discharged parallel to ceiling.Air circulating motors, multi-fan, and tube type coil and grille shall be assembled within a protective housing.Evaporator to be preassembled with expansion valve with strainer, heat exchanger, temperature control, solenoid valve, and inlet and outlet connections shall be contained within housing.Air circulation motors shall be lifetime sealed and entire unit/cooler assembly shall be readily accessible for easy adjustment.Electronically commutated motor(s) (brushless direct current motors).Cooler evaporators shall be air defrost, freezer evaporators shall be electric defrost.Piping Insulation:Insulate refrigeration piping completely with 1/2-inch thick Armaflex, AP or Rubatex pipe insulation for coolers and 3/4-inch for freezers.Install in accordance with manufacturer's instructions.Condensate Piping:Provide condensate pipe with P-trap on exterior of cold storage room to direct water into funnel at condensate drain.Condensate piping shall not be installed closer than 6 inches off floor or closer than 1/2-inch from wall face.Wrap condensate piping in freezer with 1/2-inch thick Armaflex, AP or Rubatex pipe insulation and continuous operation heater tape (heat trace) which is tied into junction box for lights. Provide direct connection splice kit. Heat tape to be direct connected using an approved for the purpose heating cable splice kit from a weatherproof junction box.Exposed Piping:Located Inside Cold Storage Room: Stainless SteelLocated Outside Cold Storage Room: Stainless SteelFABRICATIONGeneral Requirements:Walk-ins shall be 9'-6 1/4" high, prefabricated, metal clad, sectionally constructed, designed for easy and accurate field assembly with provisions for relocation and for addition of extra sections to increase size.Panels to be interchangeable.A minimum of 1 inch should be maintained to have adequate ventilation to prevent condensation between box and building wall.Fabrication of Insulated Panels:Panels:Panels shall consist of a 5-inch rigid polyurethane "foamed-in-place" core with a thermal conductivity "K" factor of not more than 0.135.Wall and ceiling insulation shall have a minimum R-value of 25 for coolers and 32 for freezers.Overall coefficient of heat transfer ("U" factor) shall not be more than 0.034.Insulation shall remain stable up to 250 degrees F.Sections shall be made without internal wood or metal structural members with 100 percent of each section, except metal shims, being urethane insulation.Bond metal facing to insulation with tongue and groove edges.Foamed in place with non-CFC or HCFC expanding agent.Smoke development of 4-inch maximum polyurethane core to be 200 or less.Flame spread rating of (4-inch maximum) polyurethane core to be 25 or less.Floor Panels: Similar to wall and ceiling panels, except fabricate to withstand uniformly distributed floor loads of a minimum of 700 pounds per square foot.Floor insulation shall have a minimum R-value of 28 for freezers.Section Fasteners:Assemble sections with speed-lock joining devices.Distance between locks shall not exceed 46 inches.Each locking device shall consist of a cam-action, hooked locking arm placed in one section, and a steel rod precisely positioned in adjoining section so that by rotating locking arm, hook shall engage over rod and with cam-action draw sections tightly together.Both locking arm and steel rod shall be housed in steel pockets set into urethane insulation.Locks to be actuated from inside walk-in, enabling sections to be erected tight against a wall.Provide an aligning device in at least one speed-lock per every vertical section.Provide gray PVC press-fit caps to close wrench holes.Supply required locking wrench as part of walk-in.Finishes:Exterior Wall Panel Faces Exposed To View: 0.032-inch stucco embossed aluminum.Interior Wall and Ceiling Panel Faces Exposed To View: 0.032-inch stucco embossed aluminum.Exterior Wall Panel Faces Not Exposed To View: 26 gauge stucco galvalume.Floor Panel Faces Not Exposed To View: 16 gauge galvanized steelExterior Ceiling Panel Faces: 26 gauge stucco galvalume.Provide a 3-foot high by 1/8-inch thick sheet aluminum diamond kickplate on exterior wall panel faces exposed to view. Attach in accordance with manufacturer's recommendations. Neatly notch plate around door hinges.Fabrication of Hinged Entrance Doors:Construction: Construction and insulation shall be as specified for wall sections.Door insulation shall have a minimum R-value of 25 for coolers and 32 for freezers.Door Size: Doors shall be 36 inches wide by 78 inches high. Provide 3-foot high, 1/8-inch thick sheet aluminum diamond kickplate on both sides of each door.Hinges: Provide 3 per door of cam action, spring assist, self-closing type, with stainless steel pin and nylon cam-type bearing.Latching and Locking:Provide a locking device on exterior and a safety inside screw release to prevent anyone from being locked in. Include tethered strike.Equip each door with a device for self-closing of door when door is closed to within 1 inch of full closure.Provide paddle lock provision for Owner provided lock.Door Gasket:Thermoplastic with a magnetic steel core shall be mounted on top edge and along both sides of each entrance door.Door bottom shall have an adjustable rubber wiper gasket.Gaskets shall be resistant to oil, fats, water, and sunlight and shall be replaceable.Anti-Sweat Heater For Freezer Door:Conceal wires behind metal edge of each entrance door jamb on all 4 sides and thermostatically control.Heaters to provide sufficient heat to prevent condensation and frost formation.Window:Provide (1) 14-inch by 14-inch triple-pane window in a heated frame in each door in cooler and freezer.Provide heated glass for freezer application.Door bumper at each door.MISCELLANEOUS EQUIPMENT AND MATERIALSThermometer: Provide a built-in dial thermometer viewable from the outside of each unit with temperature readings from minus 40 to plus 60 degrees F. Uncoil supplied temperature probe and install away from door. Thermometer to be accurate to plus or minus 2 degrees F or plus or minus 1 degree C.Lighting:Burnsville: Provide 12-inch by 48-inch, vapor-proof LED light fixtures with full acrylic lenses having smooth side of lense facing room and a driver capable for operating at a minus 15 degrees F and plus 32 degrees F to provide a minimum of 30 foot-candles, maintained value at any point in each cold storage room.Provide an operating toggle switch and pilot light mounted on exterior by each door.Provide interconnecting wiring and install in rigid conduit above cold storage room.Provide related circuit and wiring and a 3-way switch at each door for rooms with 2 doors.Base: Provide 6-inch high, Type 304, 22 gauge stainless steel coved base with No. 4 finish. Radius must be at least 1/4 inch. Provide welded, ground, and polished smooth corner at outside corners. Seal between floor and base.Sealant: Aluminum colored silicone sealant as manufactured by General Electric Company, Chicago Heights, IL, or Dow-Corning Corporation, Midland, MI.Heated Air Vent: Provide one heated air vent at each freezer door panel location.Ambient Kit:Provide head pressure control device at hermetic units and headmaster control device at semi-hermetic units to maintain proper head pressure for efficient condensing unit operation.Provide heater to keep compressor crankcase warm and to prevent refrigerant migration to compressor during off cycle.Provide outdoor housing to protect compressor/condensing unit from weather.Condensing Unit Support:Size: Must accommodate compressor/condenser unit(s).Construction: Heavy gauge angle iron welded construction painted to resist rust.Options: Foot Plates: Anchors by Food Service Equipment Contractor. - EXECUTIONEXAMINATIONVerification of Conditions:Verify that surfaces, prepared openings, and roughed-in utilities are ready to receive work and opening dimensions are as indicated on Shop Drawings.Beginning of installation signifies acceptance of existing conditions.INSTALLATIONGeneral Requirements:Assemble and install work of this Section in accordance with manufacturer's instructions.Set floor panels in place, aligning to indicated areas. Seal joints continuously and lock panels tightly together.Assemble wall panels, locked in place with cam locks. Brace securely until ceiling panels are installed.Install ceiling panels; lock into wall panels.Install threshold at door openings and electric heating elements at thresholds of freezer doors.Hang insulated doors. Adjust to operate smoothly and provide a tight seal all around when closed.Install ceiling trim, ceiling fascia, cover plates between top of room and finished ceiling, and end closure trim between room and adjacent wall.Seal joints and services through walls with silicone caulking (not foam) to provide moisture and vapor seal. Seal joints at cover plates and end closure trim.After installation of floors within and adjacent to cold storage rooms is complete, install base on interior wall surfaces and exposed portions of exterior wall surfaces. Apply a continuous bead of mildew resistant silicone sealant, on back of base near top and bottom edges, and fasten to wall using construction adhesive.TESTINGGeneral Requirements:Test, clean, and adjust equipment and apparatus installed to ensure performance will meet specified requirements.Operate each room and test full range of functions over a continuous 48-hour period, recording physical data on operating equipment, and continuously reading temperature and humidity.Adjust and retest rooms not meeting requirements.CLEANINGGeneral Requirements:Remove masking protection from stainless steel and other finished surfaces.Wash and clean all exposed surfaces of floor, walls, and ceiling and doors at interior of rooms, and exposed surfaces on exterior.DEMONSTRATIONGeneral Requirements:Demonstrate, to Owner, operation, function, and maintenance of each cold storage room and associated equipment.Manufacturer's demonstration representative to be fully knowledgeable of operating and servicing work.CHECKLIST FOR PROJECT COMPLETIONSummary: Contractor to ensure that each item listed below has been checked Ayes@ after completion, as well as, the listing of the refrigeration startup notes.Turnover: Submit a copy of this completed, signed, and dated form with the final project Closeout Documents. 1 All required Permits have been signed off by Code Authority. YES NO 2 Copies of Environmentalist=s inspection reports have been included in the Owner’s manual. YES NO 3 Is all equipment operating properly? YES NO 4 Have all known deficiencies been corrected? YES NO 5 As-Built Drawings have been updated and turned over to the Architect YES NO 6 Punch list items completed and signed off? YES NO 7 Owner’s Manuals have been completed and turned over to the Architect. YES NO 8 Walk-in cooler and freezer have been connected to the emergency generator. YES NO 9 Owner has been trained on all equipment and a video has been made of the first training session and turned over to the Owner. YES NO 10 A letter stating warranty start and end dates has been included in the Owner’s Manuals. YES NO 11 All light fixtures have the correct lamps, and all lamps are working properly. YES NO 12 All equipment is installed per the Construction Documents. YES NO 13 Equipment calibrations have been set. YES NO 14 List temperature of walk-in cooler after 24 hours of initial operation: Degrees F 15 List notes regarding cooler operation in the space below (Example: Found necessary to adjust system). 16 Notes: 17 List temperature of walk-in cooler after 24 hours of each additional period of operation until unit is properly operating. Provide associated notes. (Example: Found system to maintain temperature.) Degrees F 18 List temperature of walk-in freezer after 24 hours of initial operation: Degrees F 19 List notes regarding freezer operation in the space below. (Example: Found necessary to adjust system) 20 Notes: 21 List temperature of walk-in freezer after 24 hours of each additional period of operation until unit is properly operating. Provide associated notes. Degrees F CONTRACTOR’S NAME:CONTRACTOR’S CONTACT PERSON:CONTRACTOR’S PHONE NUMBER:DATE:END OF SECTION 11 41 23 ................
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