Exhibit_A_.pdf

Exhibit A

PART 1: GENERAL

1.01 SUMMARY

A. Section includes design, performance criteria, refrigerants, controls, and requirements for air-cooled rotary screw packaged chillers.

1.02 REFERENCES

A. Comply with applicable Standards/Codes of AHRI 550/590, ANSI/ASHRAE 15, ASHRAE 90.1 current version requirements, and ASME Section VIIII.

1.03 SUBMITTALS

A. Submit shop drawings and product data in accordance with specification requirements.

B. Submittals shall include the following:

1. Dimensioned plan and elevation view drawings, required clearances, and location of all field connections,

2. 1/3 octave band sound ratings per ARI Standard 370.

3. Single line schematic drawing of the field power hookup requirements, indicating all items that are furnished.

4. Certification of factory run test.

5. Installation manuals.

1.04 QUALITY ASSURANCE

A. Qualifications: Equipment manufacturer must specialize in the manufacture of the products specified and have five years experience with the equipment and refrigerant offered.

B. Regulatory Requirements: Comply with the codes and standards specified.

C. Chiller must be manufactured in an ISO certified facility.

D. Site visit will be required to assess the location for fitment, clearances for O&M procedures, and existing utilities. Campus is conducting a structural/seismic study to determine maximum weight allowed for existing site conditions.

1.05 DELIVERY AND HANDLING

A. Chillers shall be delivered to the job site completely assembled and charged with refrigerant and oil by the manufacturer.

B. Comply with the manufacturer’s instructions for rigging and handling.

C. If unit is to be stored, comply with manufacturer instructions for storage.

1.06 WARRANTY

A. Standard Warranty (domestic): The refrigeration equipment manufacturer’s warranty shall be for a period of one (1) year from date of equipment start up, but not more than 18 months from shipment. It shall cover replacement parts (and the labor to replace them) having proven defective within the above period.

B. Extended Compressor Warranty: 3 Year.

C. Extended Unit Warranty: 3 Year.

1.07 MAINTENANCE CONTRACT

A. Three year maintenance contract to be included performing all of the listed preventative maintenance as published in the O&M manual.

PART 2: PRODUCTS

2.01 ACCEPTABLE MANUFACTURERS

A. Basis of Design - Daikin Applied Model AWS or equivalent, including the standard product features and all special features required per the plans and specifications.

B. Equal Products - Equipment manufactured by Trane, York and Carrier may be acceptable as an equal.

Naming these products as equal does not imply that their standard construction or configuration is acceptable or meets the specifications. Equipment proposed “as equal”, must meet the specifications including all architectural, mechanical, electrical, and structural details, all scheduled performance and the job design, plans and specifications.

2.02 UNIT DESCRIPTION

A. Provide as shown on the schedule, factory assembled, factory charged with R-134a, air-cooled, packaged chillers in the quantity and size specified. Each chiller shall consist of multiple semi-hermetic screw compressors, direct-expansion evaporator, air-cooled condenser section, control system and all components necessary for protected and controlled unit operation.

2.03 DESIGN REQUIREMENTS

A. General: Provide a complete hi-efficiency packaged chiller as specified herein and as shown on the schedule. The unit shall be in accordance with the standards referenced in section 1.02.

B. Performance: Each chillers performance will be assessed based on the following factors.

1. The chiller shall be capable of stable operation to a minimum of 30% percent of full load without hot gas bypass.

2. The unit shall have factory mounted, low ambient head pressure control providing operation to 35ºF (1.7ºC).

3. The unit shall provide ventilation in the controller to provide operation above 105°F up to 125°F ambient air temperatures.

4. The chiller shall have a 42 degree supply water set point and be capable to provide a 18-20 degree delta temp., and have a nominal tonnage rating just below 300 tons.

5. Performance will be judged based on ILPV ratings, KW/Ton ratings at 25%, 50% 75%, and 100%. Please refer to the following table for defined performance requirements that will be used for this evaluation.

C. Manufacturer must provide both sound power and sound pressure data in decibels. Sound pressure data per AHRI 370 must be provided in 8 octave band format at full load. In addition, A-weighted sound pressure at 30 feet should be provided at 100%, 75%, 50% and 25% load points to identify the full operational noise envelope. If manufacturer cannot meet the noise levels (per the attached chart), sound attenuation devices and/or barrier walls must be installed to meet this performance level.

2.04 CHILLER COMPONENTS

A. Compressors: The compressors shall be field-serviceable, semi-hermetic, single-rotor screw type with one central helical rotor meshing with two opposing gaterotors. The gaterotor contact element shall be constructed of engineered composite material, dimensionally stable up to 1500ºF and wear-resistant for extended life. Compressors shall be vibration isolated from the frame by neoprene compression mounts. If a twin-screw design is used, the manufacturer shall provide an extended 5-year parts and labor warranty covering all additional moving parts. Each compressor shall have a discharge shut-off valve.

B. Electric motors: Motors shall be high-torque, two-pole, semi-hermetic, squirrel-cage induction-type with inherent thermal protection on all three phases, and cooled by suction gas.

C. Variable Frequency Drive (VFD): Each compressor shall be equipped with a VFD providing compressor speed control as a function of the cooling load. Each VFD shall provide controlled motor acceleration and deceleration, and shall provide protection for the following conditions: electronic thermal overload, over/under current, stalled motor, input and output phase loss, high load current, and current unbalance. The VFD shall provide a minimum 94% unit power factor at all load points. The drive shall be equipped with DC reactors. Compressors used in VFD controlled units must have electrically insulated, coated bearings to mitigate bearing and/or lubricant damage from stray electric current passage. Units without this protection must have an extended 5-year compressor warranty.

1. The unit controller shall display the following data:

a. Output Frequency

b. Output Current

c. Output Voltage

d. Output Power

e. Fault Code

2. The unit controller shall display the following alarms and faults:

a. Over Current-Hold

b. Over Current-Unload

c. Over Current-Alarm

d. Overheat-Hold

e. Overheat-Unload

f. Overheat-Alarm

g. Communication Fault

D. Evaporator: The evaporator shall be of the direct expansion type with single pass on the refrigerant and water side for high efficiency counterflow heat transfer and low pressure drops, carbon steel shell, and high efficiency finned coppertubes rolled into steel tube sheets. The evaporator shall be designed, inspected, and stamped in accordance with ASME Section VIIII requirements.

1. Flow Switch: Chilled water flow switch to be factory-mounted in the chilled water outlet nozzle and factory wired to terminals in the control panel.

2. Evaporator shall have right-hand connections when looking at the unit control panel.

3. The evaporator shall be insulated with ¾-inch (19 mm) closed cell polyurethane insulation.

E. Condenser: The condenser coils shall have seamless copper tubes mechanically bonded into copper, plate-type fins. The fins shall have full drawn collars to completely cover the tubes. A sub-cooling coil shall be an integral part of the main condenser coil. Condenser fans shall be propeller type arranged for vertical air discharge and individually driven by direct-drive fan motors. Factory applied anti-corrosion coating to be applied at the factory. Fan motors shall be weather-protected, three-phase, direct-drive, 850 rpm, totally enclosed air-over motors (TEAO), with class F insulation or better. ODP motors are not acceptable. Each fan shall be housed in its own compartment to eliminate condenser air cross-flow during fan cycling and shall be equipped with a heavy-gauge close-meshed PVC-coated fan guard.

F. Refrigerant Circuit: The unit must have refrigerant circuits completely independent of each other with one compressor per circuit. Each circuit shall include an electronic expansion valve, liquid line shut-off valve, replaceable core filter-drier, sight glass with moisture indicator, and combination discharge check and shutoff valve. Unit shall be equipped with a liquid line solenoid valve.

G. Unit casing and all structural members and rails shall be fabricated of steel and painted to meet ASTM B117 1000-hour salt spray test. The control enclosure and unit panels shall be corrosion resistant painted before assembly. Unit shall have condenser coil grilles.

H. Advanced microprocessor based control system:

1. Control Panel: Single-point power connection to disconnect switch with through-the-door handle and with individual circuit breakers. A NEMA Type 3R weatherproof control panel shall contain the unit control system, control interlock terminals and field-power connection points. Hinged control panel access doors shall be tool-lockable. Barrier panels shall be provided to protect against accidental contact with line voltage when accessing the control system. Fan motors shall have inherent overload protection and compressor motors shall have three-phase motor overload protection. Factory-supplied power components shall include:

a. Individual contactors and circuit breakers for fan motors,

b. Circuit breakers and factory-mounted transformers for each control-circuit,

c. Unit power terminal blocks for connection to remote disconnect switch,

d. Terminals for power supply to the evaporator heater circuit.

2. Control system starting components shall include solid-state start timer.

3. The control logic shall be designed to maximize operating efficiency and equipment life with protections for operation under unusual conditions and to provide a history of operating conditions. The system shall intelligently stage the unit to sustain leaving water temperature precision and stability while minimizing compressor cycling.

4. Equipment protection functions controlled by the microprocessor shall include high discharge pressure, loss of refrigerant, loss of water flow, freeze protection, and low refrigerant pressure. User controls shall include:

a. auto/stop switch,

b. chilled water set-point adjustment,

c. anti-recycle timer,

d. digital display with water temperature and setpoint,

e. operating temperatures and pressures, and diagnostic messages.

5. The following features and functions shall be included:

a. Durable liquid crystal display (LCD) screen type, having minimum four 20-character lines with 6 key input pad conveniently mounted on the unit controller. Default language and units of measure shall be English and I-P respectively. Messages shall be in plain English. Coded messages, LED indicators and LED displays are not acceptable.

b. Separate control section and password protection for critical parameters.

c. Remote reset of chilled water temperature using a 4-20mA signal.

d. Soft-load operation, protecting the compressor by preventing full-load operation during the initial chilled fluid pull-down period.

e. Non-volatile program memory allowing auto-restart after a power failure.

f. Recording of safety shutdowns, including date-and-time stamp, system temperatures and pressures. A minimum of six previous occurrences shall be maintained in a revolving memory.

g. Start-to-start and stop-to-start cycle timers, providing minimum compressor off time while maximizing motor protection.

h. Lead-lag compressor staging for part-load operation by manual selection or automatically by circuit run hours.

i. Discharge pressure control through intelligent cycling of condenser fans to maximize efficiency.

j. Pro-active compressor unloading when selected operating parameters exceed design settings, such as high discharge pressure or low evaporator pressure.

k. Diagnostic monitoring of unit operation, providing a pre-alarm signal in advance of a potential shutdown, allowing time for corrective action.

l. 115-volt convenience outlet mounted in control panel for all 60-Hz units.

I. Controller must have Native Bac-Net communication capabilities with ability to control the chiller from the Campus Standard Automated Logics control system. Manufacturer to define the controllable points for the chiller.

2.05 START-UP

A. Provide factory-authorized starting of chillers, and instruction to the owner on proper operation and maintenance. Must be in alignment with requirements for the provided warranty.