TECHNICAL SPECIFICATIONS.docx

TECHNICAL SPECIFICATIONS

MCNARY LOCK & DAM

MCNARY NAVIGATION LOCK VISITOR CENTER REPLACEMENT WATER-COOLED AIR-CONDITIONING UNIT

1.0 INTENT

McNary Lock and Dam will replace the Water-Cooled Air-Conditioning Unit. The original Air-Conditioning Unit rated at 150,000 British Thermal Units (BTU) with 5,400 Cubic Feet per Minute (CFM) air flow has reached the end of its serviceable life and must be replaced with an updated unit.

2.0 SCOPE OF WORK

The Contractor shall supply McNary Dam with a similar rated unit that utilizes an updated refrigerant that has a greatly reduced Global Warming Potential (GWP). McNary Project personnel will receive and install the unit..

3.0 BASIC SPECIFICATIONS

· Vertical Single Piece Unit. Rear Air Return, Top Air Discharge.

· 12.5 Tons Nominal Capacity (MBH).

· 150,000 British Thermal Unit (BTU/Hr.) Hour total heat capacity of American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE) Standard Rating Conditions of 80 Deg F Dry Bulb and 67 Deg F Wet Bulb.

· Refrigerant with a Global Warming Potential (GWP) less than 700.

· Total Fan Output averaging 5,400 Cubic Feet per Minute (CFM) at resulting Static Pressure (S.P.) allowing a minimum of Three Quarters Inches H2O for exiting ducts and outlets.

· Staged Air Volume (SAV) with Variable Frequency Drive Installed.

· 460 VAC, 3 Phase, 60 Hertz, 3 HP Motor.

· Belt Drive Fan.

· Unit is Cooling Only.

· Four Sided 2” Filter Rack.

· Cupro-Nickel Coaxial Heat Exchanger.

· Closed-Cell Foam Insulation.

· Mute Package on Scroll Compressor(s).

· A2L refrigerant Leak Detection.

· Stainless Steel drain pan with condensate overflow sensor.

· Standard Unit Protection Module (UPM).

· Stainless Steel Braided Hose Connection Kit – 24 Inches. Supply and Return Hose, Swivel connection between unit and hoses, and adapters from hoses to supply and return piping.

4.0 DETAILED GUIDE SPECIFICATIONS

SYSTEM DESCRIPTION:

· Unit shall be vertical configuration. All equipment shall be rated and certified in accordance with ANSI/AHRI/ASHRAE/ISO (American National Standard Institute/Air-Conditioning, Heating and Refrigeration Institute/American Society of Heating, Refrigerating, and Air-Conditioning Engineers/International Organization for Standardization) 13256-1. All equipment shall be tested, investigated, and determined to comply with the requirements of the standards for Heating and Cooling Equipment UL-60335-2-40 for the United States and CSA C22.2 No. 60335-2-40 for Canada, by Intertek Testing Laboratories (ETL). The units shall have AHRI/ISO and ETL-US-C labels.

· Unit shall be supplied completely factory built and capable of operation with an entering water temperature range from 20 to 110°F. Quality control system shall automatically perform via computer: triple leak check, pressure tests, evacuation and accurately charging of system, detailed heating and cooling mode tests, and quality cross checking all operational and test conditions to pass/fail criteria.

· Unit shall be individually packaged on wooden skids with protective corner posts and plastic stretch wrapping for maximum protection.

QUALITY ASSURANCE:

· All equipment listed in this section must be rated in accordance with ANSI/AHRI/ASHRAE/ISO 13256-1 performance standard, latest edition. The applicable unit shall have an AHRI/ISO label. Standard cabinet panel insulation shall meet NFPA (National Fire Protection Association) 90A requirements, air erosion and mold growth limits of UL-181, stringent fungal resistance test per ASTM-C1071 and ASTM G21 and shall meet zero level bacteria growth per ASTM (American Society for Testing and Materials) G22.

· Unit shall be factory tested in all operating modes and safety switch operation shall be verified.

· Serial numbers will be recorded by the factory and furnished to the contractor for ease of unit warranty status.

WARRANTY: Comment by Gluck, Tracy J CIV USARMY CENWW (USA): Warranty must be industry standard in commercial (FAR 12.404) purchase unless we must tailor (FAR 12.302). If tailoring 52.212-4, which is inconsistent with customary commercial practice, we must request a waiver. Per DFARS 212.302, the head of the contracting activity is the approval authority within the DoD for waivers under FAR 12.302(c).

To the maximum extent practicable, solicitations for commercial products shall require offerors to offer the Government at least the same warranty terms, including offers of extended warranties, offered to the general public in customary commercial practice. Solicitations may specify minimum warranty terms, such as minimum duration, appropriate for the Government’s intended use of the item.

· The manufacturer shall warranty the Water-Cooled Air-Conditioning Unit for a period of 12 months (Parts Only) from date of delivery.

· The manufacturer shall warranty the Water-Cooled Air-Conditioning Unit compressor for a period of 5 years (Parts Only) from date of delivery.

EQUIPMENT:

General:

· Unit shall be completely assembled, piped, internally wired, and fully charged at the factory.

Basic Construction:

· The cabinet shall be fabricated from heavy gage galvanized steel for superior corrosion protection. All interior surfaces shall be lined with 1/2-in. thick, multi-density, coated, fiberglass insulation. Insulation must be non-combustible, non-hydroscopic and anti-fungal. Insulation must meet NFPA 90A and 90B for fire protection as well as Fire Hazard classification 25/50 (per ASTM E84 and UL 723 and CAN/ULC S102-M88), ASTM C1071, erosion requirements of UL181 and be certified to meet GREENGUARD indoor air quality standards for low emitting products. One blower access panel and two compressor compartment access panels shall be removable with supply and return air ductwork in place.

· Unit shall have the following airflow arrangements available. The contractor shall be responsible for all extra costs incurred as a result of the unavailability of these airflow arrangements. Additionally, the discharge and return connections cannot be reconfigured in the field, as this can compromise the structural integrity of the unit and will void the warranty.

Vertical unit: Rear Return/Top Discharge.

· Unit shall have a stainless-steel drain pan as standard to comply with this project’s IAQ (indoor air quality) requirements. Painted steel or plastic is not acceptable. Drain pan must include a condensate overflow safety switch that will shut the unit down in an overflow event.

· Unit shall have a factory-installed 2 in. four-sided filter rack capable of accepting 1-in. filters. Units shall have a 1 in. thick throwaway type fiberglass filter as standard. The filter rack shall incorporate a 1 in. duct flange.

· Cabinet shall have separate holes and knockouts for entrance of line voltage and low voltage control wiring. Supply and return water connections shall be brass female pipe thread (FPT) fittings and mounted flush to cabinet exterior. Connections that require a backup wrench or that extrude past the unit corner post are not acceptable. Condensate connection will be stainless steel female pipe thread fittings. Plastic is not acceptable.

FAN AND MOTOR ASSEMBLY:

· The fan shall be belt driven DWDI forward curved type with dynamically balanced wheel. The fan motor shall be 1725 or 3450 rpm 56 frame sealed ball bearing type. The motor shall be permanently lubricated and have thermal overload protection.

· The fan and motor assembly must be capable of overcoming the external static pressures as shown on the schedule. External static pressure rating of the unit shall be based on a wet coil. Ratings based on a dry coil shall not be acceptable.

· Motor shall be rated for use with variable frequency drives (VFD).

· Variable Frequency Drive (VFD) shall be factory installed and include the following:

· VFD shall be wired for 2-speed staged air volume operation.

REFRIGERANT COMPONENTS:

· Unit shall use R-454B refrigerant. Unit shall have a factory sealed and fully charged refrigerant circuit.

· Hermetic scroll compressors shall be specifically designed for R-454B refrigerant and shall be internally sprung, externally isolated and with thermal overload protection. Unit compressors shall have rubber isolators to prevent transmission of vibration to the structure.

· Refrigerant metering shall be accomplished with a thermostatic expansion valve. Unit with only capillary tubes is not acceptable.

· The finned tube heat exchanger shall be constructed of lanced aluminum fins not exceeding sixteen fins per inch bonded to rifled copper tubes in a staggered pattern and will have a 600-psig working refrigerant pressure. The heat exchanger shall have aluminum end sheets.

· Reversing Valve: Reversing valve shall be four-way solenoid activated refrigerant valves that will fail in the heating operation should the solenoid fail to function. Reversing valve that fail to the cooling operation shall not be allowed.

· Coaxial (tube in tube) refrigerant-to-water heat exchanger. Refrigerant-to-water heat exchanger shall be of copper inner water tube and steel outer refrigerant tube design rated to withstand 600-psig working refrigerant pressure and 400-psig working water pressure. Shell and tube style refrigerant to water heat exchanger shall be treated as pressure vessel and shall require refrigerant pressure relief valve piped to the exterior of the building. The contractor supplying the water source heat pump with shell and tube heat exchanger shall be responsible for any additional installation costs. Brazed plate water-to-refrigerant heat exchangers shall require additional centrifugal separators added to the supply water piping at each unit. Each separator shall have an automated clean out valve piped to a waste line. The contractor supplying water source heat pump with brazed plate heat exchangers shall be responsible for any additional costs.

· A2L refrigerant Leak detection shall be provided with units exceeding refrigerant charge 64 oz. per circuit for the refrigerant leak detection system.

· Cupronickel coaxial water-to-refrigerant heat exchangers shall be provided, with cupronickel inner water tube construction.

· Safety controls shall include both a high pressure and low-pressure switch. Temperature sensors shall not replace these safety switches.

· Refrigerant pressure test ports shall be factory installed on high- and low-pressure refrigerant lines to facilitate field service. Unit shall be equipped with a dedicated accesses panel for the test ports not requiring removal of the primary cabinet panels to access the test ports.

· Activation of any safety device shall prevent compressor operation via a lockout circuit. The lockout circuit shall be reset at the thermostat or at the contractor supplied disconnect switch. Units which may be reset at the disconnect switch only shall not be acceptable.

· Cooling only option shall be included with the unit, which excludes a reversing valve from the refrigerant circuit.

CONTROLS AND SAFTIES:

Electrical:

· Controls and safety devices will be factory wired and mounted within the unit. Controls shall include fan relay, compressor contactor, 24-v transformer, reversing valve coil, and Unit Protection Module (UPM). The standard transformer shall be rated for a minimum 75 VA, and 100 VA for units with HGRH, or WSE, or Boilerless E-heat option, or TruVu controller, or SCU Open controller. Unit shall be name plated for use with time-delay fuses or HACR circuit breakers. Unit controls shall be 24-v and provide heating or cooling as required by the remote thermostat/sensor.

· Unit shall have a factory installed and labeled terminal strip input for field provided thermostat or DDC controller.

· Unit shall include a factory provided wiring diagram on the inside of the control access panel.

· Unit shall have a short circuit current rating (SCCR) of no less than 5 kA.

· Unit shall have a Unit Protection Module (UPM) printed circuit board which implements following equipment safeties:

· Anti-short cycle time delay (5-minute delay on break).

· Random start time delay on initial power.

· Brownout/surge/power interruption protection.

· 120 second low pressure switch bypass timer.

· High refrigerant pressure shutdown.

· Low refrigerant pressure shutdown.

· Water coil freeze protection shutdown.

· Air coil freeze protection shutdown.

· High condensate level shutdown.

· 24 vac alarm output for remote fault indication.

· Refrigerant leak shutdown.

· Intelligent alarm reset.

· The UPM shall automatically reset after a safety shutdown. Restart the unit if the cause of the shutdown no longer exists (except for low temperature and high condensate level shutdowns). Should a fault re-occur within 60 minutes after reset, then a “hard” lockout will occur. A light-emitting diode (LED) shall annunciate the following alarms: brownout, high refrigerant pressure, low refrigerant pressure, low water temperature and a high level of condensate in the drain pan, refrigerant leak fault. The LED will display each fault condition as soon as the fault occurs. If a hard lockout occurs, then the fault LED will display the type of fault until the unit is reset.

· The UPM shall feature the following field configurable adjustments:

· Lock out reset on thermostat interruption or power reset.

· Two or four restart attempts before a hard lockout.

· Test mode (reduces all time delays to 5 seconds for diagnostic work).

· Air/water coil freeze limit trip.

5.0 TRANSPORTATION - SHIPPING AND DELIVERY

Site Access: The contractor’s pick-up and delivery resource shall comply with the U.S. Army Corps of Engineers’ projects’ security policies. The Government project sites are secured areas and access onto the projects is restricted. The security measures affect all the contractor's vehicles and personnel. There will be delays when entering projects due to locked gates, vehicle inspections, and personnel checks. Inspections and checks may include inspection of toolboxes, briefcases, lunch boxes, and other containers. The Contractor shall be responsible for coordination with McNary Lock and Dam Contracting Officer Representative (COR) site prior to arrival.

Loading & Unloading Support: The Government can provide equipment support (forklift, crane, etc.) to the contractor for the loading of the seal molds onto the contractor’s transport vehicle at time of initial pick-up at McNary Dam. The Government will provide equipment support (forklift, crane, etc.) to the contractor for the unloading of the seal molds and seal assemblies from the contractor’s transport vehicle at time of final delivery to McNary Dam. The contractor shall provide the COR written notice (email) at least 48-hours prior to the dates requiring the Government loading and unloading support.

Transport of Equipment: The contractor shall furnish the transportation services required for final delivery to McNary Dam. The contractor shall be responsible for all shoring, blocking, bracing, strapping, dunnage, tarps, etc. required to secure and protect the Water-Cooled Air-Conditioning Unit on the transport vehicle. If the contractor intends to use a box van type transport vehicle (equipped with walls and roof), the contractor is responsible for furnishing a pallet jack or similar equipment for maneuvering the Water-Cooled Air-Conditioning Unit inside the transport vehicle cargo area.

The Contractor shall be responsible for packing and shipping the unit in a manner that will ensure undamaged and complete arrival to McNary Lock and Dam.

All items shall be FOB Destination within EIGHT (8) weeks of award of contract. Shipments are only allowed during normal business hours of Monday – Thursday 7:00am to 4:00pm.

All shipments shall be delivered to:

9.0 SUBMISSION OF INVOICE

Invoices should be submitted via email in electronic format to the COR who will review and approve then forward approved invoices on to USAED Millington Finance Center for payment. All invoices must have Contractor’s name as it appears in SAM.gov and contract number.