United States Air Force, Air Education and Training Command, Columbus AFB, Contracting Squadron, 555 Seventh Street, Suite 113, Columbus AFB, MS, 39710-1006

41 -- NATURAL GAS ENGINE DRIVEN CHILLER SOL F22608-99-RA001 DUE 041299 POC Jason Richards, Contract Specialist, Phone (601)434-7760, Fax (601)434-7765, Email jason.richards@columbus.af.mil -- Gary Rizzolo, Contract Specialist, Phone (601)434-7767, Fax (601)434-7765, Email WEB: Visit this URL for the latest information about this, http://www.eps.gov/cgi-bin/WebObjects/EPS?ACode=P&;ProjID=F22608-99-RA0 01&LocID=586. E-MAIL: Jason Richards, jason.richards@columbus.af.mil. This is a combined synopsis/solicitation for commercial services prepared in accordance with the format in FAR Subpart 12.6, as supplemented with additional information included in this notice. System Description: Contractor shall in accordance with the plans furnish and install two 65 ton (nominal) cooled liquid chiller(s). The microprocessor-controlled chiller utilizes a reciprocating compressor operating with Refrigerant-22 and driven by gas engine. Capacity of each shall not be less than 63 refrigeration tons cooling 156 gallons per minute of Water form 54 degrees F to 44 degrees F when operating in 95 degrees F ambient air. The fuel requirement of the chiller shall be 715 scfh natural gas at a minimum supply pressure of 7-14 in we. Electrical requirements shall be 208/230 or 460 volts, three phase; the system maximum Amps shall be no more than 49 amps for 208/230 volts or 22 amps for 460 volts (all 60 hertz line current). The units shall be factory furnished for 208/230 volts, three phase, and shall be capable of being modified to 460 volts, three phase. Additional specifications, each chiller is to be weather proof, trailer mounted, and capable of being towed on streets. Trailer is not government furnished. Trailer to have lights so it can be safely towed after dark. Size of trailer is to fit the manufacturer's unit. Trailer hitch is to be pendal type, capable of mounting to a standard military hitch. Each chiller shall have the following: electrical hook up for HVAC controls, quick disconnect for 440 and 220 volt power, all electrical components and installation to be compatible with National Elec. Code for exterior operation, chilled water hook up must be capable of "quick connects" for 4", 6", and 8" chilled water lines, natural gas quick connects are required, natural gas system must include regulators and valves to allow connection to natural gas distribution. Quality Assurance: Chiller performance ratings shall be in accordance with ARI Standard 550-92. The chiller shall be ETL listed, a nationally recognized independent testing laboratory. ETL listing is in compliance with the Requirements of the Standard for Heat and Cooling Equipment (ANSI/UL-1995) and Performance Protocol Established by AGA Requirements for Gas Fired Engine Driven Air conditioner Appliance No. 4-89. The chiller shall undergo a factory run test at full capacity to ensure proper set-up and operation of all components. Written certification shall be available form the factory upon request. Piping within the confines of the system shall be tested in accordance with ASHRAE Standard 15 and ANSI B31.5 refrigeration piping code. The entire chiller assembly shall be leak tested with dry nitrogen to 200psig and the package shall be checked for leaks using SNOOP Leak-Tec or equal. After leak testing the package shall be evacuated and charged with holding charge of R-22 for shipment. The system shall undergo a dielectric withstand test to 1416 volts (208/230 volt units) or 1920 volts (460 volt units) for 1 second. Compressor: The chiller shall be furnished with one open-drive reciprocating compressor directly driven form the engine. The compressor shall have the following mechanical characteristics: Housing shall be designed in compliance with UL Guide No. 361-E-O. There shall be six cylinders with a 3 14" bore. Piston stroke shall be 3 7/16". The capacity control of the compressor shall be accomplished by modulating engine speed for continuous unloading down the 67% and by unloading cylinders for step modulation down to 22%. The internal unloading shall be hydraulically actuated in direct response to chilled water setpoint. The lubrication for the compressor shall consist of the following: There shall be an internal oil pump driven by the crankshaft to provide lubrication to the main bearings, crankshaft, pistons, connecting rod journals, and shaft seal. There shall be an oil screen located in the crankcase oil reservoir to provide filtration. There shall be an internal pressure relief valve, which shall relieve pressure form discharge to suction if the differential exceeds 350 psi. There shall be a 200 watt thermostatically controlled oil heater in the crankcase oil reservoir to maintain the oil temperature during off cycles. Engine: The gas engine shall be naturally aspirated and spark-ignited. The ignition system shall include a High-Energy Ignition (HEI) electronic distributor with eight ignition wires and spark plugs. The starting system shall include a 12-volt dc power supply; a 12-volt sealed battery, a straight drive starter motor, and related wiring. The lubrication system shall include an internal engine driven oil pump, an oil pressure regulator, an oil filter, and an oil cooler, which rejects heat to the engine coolant. Also, it shall include a remote oil reservoir pump, level switches, hoses, and controls for connection to an external 26-gallon oil reservoir. The coolant system shall be a pressurized, closed loop, direct jacket cooling circuit. It shall include an engine-driven pump, a pressure cap, a thermostat, and an expansion tank. It shall provide cooling for the engine jacket, exhausted manifolds, and oil cooler. The coolant system heat shall be rejected by the condenser fans through a separate coil. The fuel system shall be suitable for a low-pressure gas supply (7 in wc minimum). The gas train shall consist of 2 solenoid shut-off valves wired in series, a gas pressure regulator, a carburetor, and a throttle body assembly. The engine shall include a closed Positive Crankcase Ventilation system which shall remove corrosive gases from the engine crankcase and direct them back into the intake manifold to be burned along the with regular fuel charge. Air-Cooled Condenser: The condenser coils shall be constructed of seamless copper tubes mechanically expanded into plate aluminum fins. Each condenser shall have a capacity of 977,000 btu/hr on R-22 at 95 degrees F air entering and 8 degrees F subcooling. Condenser fans shall be propeller type arranged for vertical air discharge and shall be individually driven by direct drive fan motors.Each fan shall be protected by a heavy-duty fan guard. Condenser fan motors shall be 3 phase, direct drive, 1140 rpm, open drip-proof type positioned within the cabinet for weather protection. Enclosure: Unit casing and structural members shall be fabricated of continuous galvanized steel and galvanized steel channel. Exterior casing shall be finished in aluminum. Controls: The chiller shall be furnished with an electronic microprocessor-based control system including the microprocessor, power supplies, a digital I/O board with relays, an analog sensor board including sensors, a two-line 20 character alpha-numeric display, start/stop keys, status lights, reset buttons, function keys, an emergency stop push-button, an engine overspeed safety device, a modem for remote communications, and related mechanical relays and wiring. Start-up and shutdown of the machine shall be manual or automatic. Automatic operation shall be activated by a switched input form the customer tot he control panel. Chilled water setpoint shall be manually entered at the control panel or input to the system with a varying signal from a building management system. The control panel shall be able to output a signal to start the chilled water pump and indicate that the unit is in alarm. The control panel shall be able to accept a mandatory input signal form the customer to confirm flow in the chilled water loop before starting. The control panel shall be quipped with a Remote Monitoring and Control System (RMCS) which shall allow monitoring and limited control of the unit from a remote site though a customer phone line interface. The control system shall have the option of controlling the chilled water return temperature rather than the supply temperature. The control system shall be capable of restarting the unit automatically fifteen minutes after power is restored following an outage. The control system shall be capable of cycling the chiller when it operates below 40% capacity for an extended period of time in order to facilitate oil return. The following functions shall be available form the control panel: start chiller, stop chiller (normal & emergency), adjust chilled water setpoint, adjust maximum engine speed setting, clear alarms, clear prealarms, set time and date, energize individual outputs for diagnostics when unit is not operating, calibrate chilled water thermistor, calibrate analog card, change control gains, change cycle restart temperature, change remote setpoint input signal range. The following information shall be available form the standard display output: Chilled water outlet temperature, chilled water setpoint, engine rpm, number of compressor cylinders loaded, engine throttle percentage, runtime, EFLH, starts, average load, maximum speed setting, suction temperature, enclosure temperature, engine oil temperature, engine coolant temperature, superheat, saturated suction temperature, saturated discharge temperature, suction pressure, discharge pressure, compressor oil pressure, last 20 alarms, date and time. The sequenceof operations shall initiate with a pump start sequence, followed by the engine start, engine warm-up, compressor loading, engine speed rampup, and then setpoint control. Setpoint control shall be achieved by modulating engine speed in a range of 1200 to 2000 rpm. Safeties and Diagnostics: The control system shall automatically shut down the chiller when one of the following alarms occur (listed as displayed): Analog Care Failure, Engine Oil Level (Low Or High), ESTOP/IGN Power Failure, Hi Accel Time, Hi Comp Oil Press, Hi Coolant Temp, Hi Discharge Press, Hi Enclosure Temp, Hi Engine Oil Temp, Keypad Failure, Lo Chiller Temp, Lo Chiller Flo, Lo Comp Oil Press, Lo Coolant Temp, Lo Eng Oil Pressure, Lo Suction Pressure, Overspeed, Processor Error, Start Failure, Underspeed. The control system shall take corrective action by reducing capacity when it is detected that the system is approaching one of the following alarms: Hi Discharge Press, Hi Coolant Temperature, Lo Engine Oil Press, Lo Suction Pressure. Oncethe condition is within acceptable limits, the system shall resume normal operation. The control system shall include a diagnostic mode, which allows all output devices to be energized individually when the system is shutdown for the purpose of troubleshooting. These outputs include pumps, solenoids, heaters, and relays. The control system shall be equipped with a redundant engine overspeed safety device independent of the microprocessor which shall interrupt power to the gas solenoid when it senses an overspeed. This commercial acquisition incorporates the following clauses and provisions by reference: 52.204-6 Contractor Identification Number, 52.212-1 Instructions to Offerors-Commercial Items, 52.212-3 Offerors Representations and Certifications Commercial Items, 52.212-4 Contract Terms and Conditions-Commercial Items, 52.212-5 Contract Terms and conditions Required to Implement Statutes or Executive Orders-Commercial Items, 52.216-24 Limitation of Government Liability, 52.216-25 Contract Definitization, 52.232-33 Mandatory Information for Electronic Funds Transfer Payment, 52.232-34 Optional Information for Electronic Funds Transfer Payment, 252.225-7001 Buy American Act and Balance of Payments Program. All quotes are due NLT 1600 CST on 12 April 1999, to 14th Contracting Squadron, 555 Seventh St., Room 113, Columbus AFB MS 39710-1006. Tentative award date is 19 April 1999. Comments, questions, and suggestions regarding this RFP may be directed to A1C Richards 601-434-7759 or MSgt Rizzolo 601-434-7767. Fax quotes will be accepted at 601-434-7765 and will be subject to the deadline conditions above. Posted 03/30/99 (D-SN314256). (0089)

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