NCCI walk-in specification 2-07-2020.doc

Request for proposal DRM 2020-10 Walk-in Freezer Project Project Manager: Steven Lemmo, steven.lemmo@doc.state.ma.us , 508-422-3664 Project location: North Central Correctional Institution, 500 Colony Road, Gardner, MA 01440 Mandatory site visit date: 2/20/2020 at 10:00A.M.

Interested vendors must notify Pam Biagi via email @ pam.biagi@state.ma.us no later than

2/18/ 2020 if you are planning to attend the site visit.

NOTE: In order to meet the accelerated timeline all prospective bidders must have their quotes including shop drawings returned no later than 1:00 P.M. on 3/ 9/2020. The project must be 100% complete including closeout documentation by 6/15/2020.

Scope:

Contractor is responsible for the complete turn-key installation of the following freezer. Including all permits as required by the AHJ, but not limited to electrical, refrigeration piping, plumbing, floor venting, wall protection, and alarm installation.

Certification:

Only panels that have been tested as a finish manufactured product shall be considered. Each panel must have attached to the edge the following seals:

NSF – National Sanitary Foundation

U.L. approval seal for BOCA test ASTME-84-76

Panel Construction:

Panels sizes to be constructed and comprised of 11 ½”, 17 ¼”, 23”, and 46” widths and shall have metal skins with minimum thickness of 4” unless otherwise specified.

Foam core shall be pour-in-place urethane; heat cured in steel jigs, so as to provide dimensional stability from minus 90 degrees to plus 250 degrees Fahrenheit dry heat. Corners shall be one- piece molded type. No wood shall be allowed.

Panel Fastener:

Walk-in panels are to be assembled with “speed-lok” joining devices. Each lock device shall consist of a replaceable cam-action “hook” in a steel pocket, plus a steel “pin” in the opposing pocket. By rotation the panels are drawn and locked together. Each locking device shall have a tension load of 750 lbs. or greater when tested as a finished product.

To provide maximum wall reinforcement, the locking pockets shall be interconnecting with steel straps from one side of the panel to the other side. A minimum of three horizontal steel straps shall be in each vertical wall panel and also in ceiling and floor panel.

Additional reinforcement shall be provided where the wall and ceiling interlock and in cases where a floor is provided, the wall to floor connection. Reinforcement shall be having the hook assembly pocket that connects to the ceiling or floor panel; welded to the top and/or bottom horizontal steel strap.

Exterior Finish shall be: 24 Gauge Galvalume Steel Interior Finish shall be: walls – 24 Gauge Galvalume Steel, ceiling – embossed white galvalume steel Floor Finish shall be: - 480 S/F 3/16” Aluminum Diamond Tread (Overlay) insulated floor with ADT Ramp Overlay and 1 C-channel floor reinforcement by equipment contractor Doors:

(One) 60” x84” manual single left hand swing heated hinged door with mirror image frame, embossed white finish interior and exterior, locking provision with emergency release. Tamper proof prison package, 1/8” kick plate exterior & interior, 1 Int. Stainless steel ramp (60” door), .

Panel Installation:

Only qualified personnel having at least 5 years of experience shall erect the walk-in. Contractor is responsible for checking the job site prior to installation and notifying appropriate owners representative to any issues that will prevent a quality installation. Ceiling panels to be suspended from structure over-head. Panels to be leveled per installation instructions.

All panels shall be installed level and plumb. Installer shall carefully check walk-in during installation process to ensure walls are installed square and the door is plumbed for proper operation.

Box size: 30’-0” x 16’-0” x 9’-6” Accessories: Basis of design

1. (6) Kason model 1810 LED lights shipped loose for install by electrician

2. Kason Hi Flo Pressure relief port

3. (3) Audio-visual temperature alarm with two temperature probes, model 75LC, install in supervisors office to monitor new freezer.

7. Five year system warranty – not prorated and to include complete condensing unit and evaporator parts Refrigeration System:

Basis of Design

MODEL # CONDENSING UNIT

MODEL # EVAPORATOR

(2) BQZA035 L8-HT3AH (208-230/3/60)

(2) BLP314LE-S2B-TSV+208/1/60

Mechanical Equipment Installation:

Furnish and install the interconnecting piping between the condensing unit and the respective unit coolers. Piping shall be installed in a neat and workmanlike manner with adjustable hangers spaced at no more than six-foot intervals on horizontal runs, and 10-foot intervals on vertical runs.

Appropriate line sizing practices must be used throughout the installation of the refrigeration system. Special consideration must be taken when the condensing unit is installed above the evaporator.

Piping practice and line sizing charts as recommended by ASHRAE or other reputable refrigeration standards must be followed to ensure minimum pressure drop and correct oil return. An inert gas such as dry nitrogen should be passed through the piping during welding or brazing operations. This reduces or eliminates oxidation of the copper and formation of scale inside the piping. Refrigerant piping shall be Type L, ACR grade, hard-drawn seamless copper tubing, wrought type copper fittings and silver-bearing soldered joints.

Condensing units shall be installed on the exterior of the building within close proximity of the freezer unit and elevated off the ground utilizing manufacture approved wall bracketing.

Condensate drain: Furnish and install condensate drain piping from the unit cooler to open drain. Piping shall consist of 7/8” Type L copper tubing supported 36” on center maximum, in such a way that there will be a 1” clearance between the wall and the tubing. Provide a union or slip fitting at the connection to the evaporator drain pan to allow easy disassembly for service and cleaning. Drain piping shall be P-trapped and adequately pitched through the wall of the refrigerated area and discharged within 2” of the floor drain provided. Freezer drain line shall be wrapped with heat tape and insulated to prevent condensate from freezing.

Piping Insulation: Suction line shall be covered with 1” thick non split Armor flex insulation, the insulation shall be applied to these lines in accordance with manufacturer’s recommendations and as they are being installed so that insulation will not be split. All joints shall be completely sealed with overlapping, cemented material to prevent the formation of frost on the lines. All penetrations shall be sealed with non-hardening caulking compound. The exposed ends of the penetration must be trimmed.

Refrigerant Testing:

All system piping, including the condensing unit and accessories should be thoroughly tested for leaks prior to start up and charging. The system should be initially pressurized to a maximum of 150 PSIG with dry nitrogen to ensure that the system is free of major leaks. Discharge the initial dry nitrogen charge and add enough refrigerant to raise the system pressure up to 10 PSIG. Add dry nitrogen to increase the system pressure to a maximum of 150 PSIG. It is recommended that an electronic leak detector be used. It is recommended that this pressure be held for a minimum of 12 hours and then rechecked. (When conventional leak detection methods are employed using HCFC or CFC tracer gas, all of the tracer gas must be reclaimed and disposed of in a proper manner.

When the system is completely free of refrigerant leaks, an evacuation of the entire system should be completed by using a high vacuum pump. This evacuation will ensure long life for the system as well as elimination of moisture and non-condensable gas problems. Moisture problems causing compressor failure will void the warranty.

If the temperature is less than 60 degrees the final vacuum should be 50 microns. Double evacuation with a “sweeping” of dry nitrogen is required. First evacuation should be to at least 750 micron depth. When this point is reached, break the vacuum with dry nitrogen. Reclaim any tracer gas from the system and re-evacuate to a final vacuum of at least 100 microns at a minimum 60 degree system temperature.

When charging the system, weigh the refrigerant drum before and after charging in order to keep an accurate record of the weight of refrigerant put into the system. Do not charge strictly by the holding capacity of the receiver. Do not assume that bubbles in a sight glass, when located at the condensing unit, indicates the system is undercharged. If charging to the “bubble” method, always use a sight glass located directly before the TXV for the final indicator.

Follow the system start-up procedure as recommended by the manufacturer. Observe that all electrical and refrigeration connections are tight. Check Compressor crankcase oil level. Insure the compressor shipping spacers or hold down nuts are properly mounted. Check the compressor discharge and suction shut-ff valves are open. Ensure that the high and low pressure controls are properly adjusted. Check the room thermostat is set for normal operation and adjust if necessary.

Guarantee: The equipment shall be guaranteed to maintain the specified temperatures. All mechanical refrigeration equipment shall be mechanically guaranteed for a period of one year after date of acceptance of owner. The emergency service shall be provided free of charge, whenever necessary on a 24 hour, seven day-per-week basis. Any leaks that occur during the first year of operation after acceptance by the owner shall be repaired and the necessary refrigerant added at no expense to the owner. The name of the installer/service agency for the guarantee period shall be located in a highly visible place on the condensing unit and on the inside of the walk-in door.

Panel guarantee shall be ten years and shall cover manufacturer quality defects. Excluded is damage due to abusive treatment.

Floor Prep: The contractor is install panels and insulated floor system. In addition, 4” x 4” steel angle shall be installed on all exterior exposed walls and around complete interior. A ramp shall be installed from the door opening to allow for entry into the freezer.

Box Protection:

Contractor to install perimeter wall protection throughout the interior of the box utilizing 4” or greater galvanized angle iron secured to the floor as directed by the box manufacture. Exterior protection to include approximately 92’ of 4” or greater galvanized angle iron mounted to the concrete floor.