Guide Specification Smardt water Cooled Chillers
Guide Specification – Smardt Air-Cooled Chillers
GENERAL
1.1 SUMMARY
Section includes design, performance criteria, refrigerants, controls, and installation requirements for water-cooled centrifugal chillers.
1.2 REFERENCES
Comply with the following codes and standards:
AHRI 550/590
ANSI/ASHRAE 15
ASME Section VIII
ETL Listed
ANSI UL 1995
CSA C22.2 No. 236(Canada)
MEPS(Australia)
1.3 SUBMITTALS
Submittals shall include the following:
A. Dimensioned plan and elevation drawings, including required service clearances and location of all field piping and electrical connections.
B. Electrical and water quality requirements during operation, standby and shutdown.
C. Control system diagram showing points for field interface and connection to external BMS systems. Drawings shall show field and factory wiring.
D. Installation and Operating Manuals.
E. Manufacturers certified performance data as per AHRI at full load and IPLV or NPLV.
1.4 QUALITY ASSURANCE
A. Regulatory Requirements: Comply with the standards in Section 1.2.
1.5 DELIVERY AND HANDLING
A. Chillers shall be delivered to the job site completely assembled (unless otherwise specified).
B. Comply with the manufacturer’s instructions for transporting and rigging.
1.6 WARRANTY and MAINTENANCE
A. The chiller manufacturer’s warranty shall be for a period of one year from date of equipment start up or 18 months from the date of shipment, whichever occurs first.
B. The warranty shall include parts and labor costs for the repair or replacement of parts found to be defective in material or workmanship.
C. Maintenance of the chiller equipment, while under warranty is mandatory and shall be the responsibility of the purchaser unless supplied by the manufacturer.
Optional:
1. 2-5 year chiller and compressor parts and labor warranty.
2. Refrigerant warranty
PRODUCTS
2.1 ACCEPTABLE MANUFACTURERS
A. Smardt Inc.
B. Approved Equal. Note approved equal does not automatically imply the alternate product matches this specification, functionality or delivered quality.
2.2 PRODUCT DESCRIPTION
A. Provide and install as shown on the plans a factory assembled water-cooled packaged chiller.
B. Each unit shall include one or more Turbocor, magnetic bearing, and variable-speed centrifugal compressors. Integrated variable frequency drive shall operate with inlet guide vanes. Chillers shall operate with HCF-134a refrigerant not subject to phase-out by the Montreal Protocol and the U.S. EPA Phase-out schedule.
C. The evaporator, condenser, and expansion valve shall be configured to operate as a single refrigerant
circuit unless otherwise specified. The chiller unit compressors shall be designed for mechanical and electrical isolation to facilitate service and removal.
2.3 DESIGN REQUIREMENTS
A. Unit shall consist of one or more magnetic bearing, oil-free centrifugal compressors with integrated variable frequency drive, refrigerant flooded evaporator, water cooled condenser and operating controls with equipment protection.
B. Performance: Refer to schedule for specific operating conditions. When utilizing Turbocor model TT300 compressors chiller shall be capable of stable operation down to 20 tons. When utilizing TT350 the chiller shall be capable of stable operation down to 35 tons. All these ratings measured at standard AHRI entering condenser air temperatures and without utilizing hot gas bypass.
C. Acoustics: Sound pressure for the unit shall not exceed the following specified levels, and be less than 78 dBA, measured a 1 meter (3.28 feet) for 60 ton units and be less than 85 dBA, measured a 1 meter (3.28 feet) for 60 ton units. Sound data shall be measured according to AHRI Standard 370-2011.
D. Chiller shall be equipped for single-point power connection.
E. Evaporator shall be designed to allow for the flow rate to be reduced to the rate of 1 gpm per ton without entering laminar flow to allow for variable chilled water flow and facilitate chilled water pump energy savings. The chiller shall be able to operate in a stable fashion at this condition for at least 8 hours continuously independent of condenser water flow rate or condenser air temperature relief.
F. Each compressor shall be electrically and mechanically isolated so that if a compressor fails or needs service it can be serviced or removed from the chiller without disabling the other compressors or the chiller. The chiller shall be able to operate with the remaining compressors with (1) or more compressors removed.
G. All chillers with shall be equipped with a load balancing valve for capacity control and supply chilled temperature stability.
H. All chillers equipped with (2) or more compressors shall be equipped with equipped with individual compressors staging valves to channel discharge gas from the outlet of the compressor to the evaporator in order for the ramp up during a high pressure ratio application.
I. All painted sheetmetal surfaces shall be provided with a two-layer zinc coated paint capable of withstanding 1500 hour salt spray exposure under ASTM standard B117.85. Manufacturers other than basis of design shall provide a test sample report of sheetmetal corrosion resistance by an independent lab that was conducted within the past 12 months.
2.4 CHILLER COMPONENTS
A. Compressors:
1. Compressors shall be of semi-hermetic centrifugal design and operate oil-free with two-stages of compression, magnetic bearings, movable inlet guide vanes and integrated variable frequency drive system.
2. Automatically positioned and controlled inlet guide vanes shall operate with compressor speed controls.
3. The compressor shall be capable of coming to a controlled stop in the event of a power failure. The unit shall be capable of initializing an automatic restart in the case of power failure.
4. Each compressor shall have integrated microprocessor control capable of capacity and safety control.
5. Each compressor shall be installed with individual suction service valve, spring tension manual tightening combination discharge check valve and motor cooling refrigerant line isolation valves. Chillers without discharge line isolation valves that rely on non return valves in discharge line for compressor removal shall not be accepted. Refrigerant Discharge line shall has a combination of shut off and check valve, blank seal are not acceptable.
6. Guide Vanes: Modulating with factory mounted electric operator, suitable for capacity reduction down to fifteen (15) percent of specified load without hot gas bypass. Option: 10% of the specified load without hot gas bypass depends on the compressor model.
7. If compressor driver motor uses antifriction bearing with an oil lubricating system, the chiller manufacturer must provide a 20 year warranty of the compressor bearings as well as all preventive maintenance for a period of 20 years. In addition, chillers containing oil must include a 10 year warranty on all systems components and labor. All costs associated with annual oil and oil filter changes plus oil analysis for the whole life cycle of the machine should be at manufacturer expense.
8. If the compressors contain an atmospheric shaft seal, the chiller manufacturer must provide a 20 year warranty of the shaft seal as well as all preventive maintenance for a period of 20 years. In addition, the manufacturer must provide a 20 year refrigerant replacement warranty for losses due to a failure of the shaft seal.
9. If the compressor/motor uses any form of antifriction bearing (roller, ceramic, ball, etc), the chiller manufacturer shall provide at no additional charge; A 20-year bearing warranty and all preventative maintenance as specified by the manufacturer’s published maintenance instructions. At start up a three-axis vibration analysis and written report to establish bearing condition baseline. An annual three-axis vibration analysis and written report indicating bearing condition.
B. Prime Mover:
1. Permanent-magnet, synchronous hermetically sealed motor of sufficient size to effectively provide compressor horsepower requirements. Motor shall include soft-start capabilities with an inrush current of no more than 2 amps. Motor shall be liquid refrigerant cooled with internal thermal overload protection devices embedded in the winding of each phase.
2. Compressor motor and chiller unit shall include variable-frequency speed controls to match cooling load demand to compressor speed and inlet guide vane position.
3. Each compressor shall be equipped with a 5% impedance AC line reactor and individual disconnect or circuit breaker
4. Option: Having a minimum short circuit withstand rating of 65,000 or 100,000 amps with shunt trip
C. Evaporator:
1. Evaporator shall be shell-and-tube type and have separate shells. Heat exchangers shall be designed, constructed, tested and stamped according to the requirements of the ASME Code, Section VIII Code Case 1518-5. They shall have a copper wall of 0.025 in. wall thickness. In the evaporator, refrigerant shall be in the shell and water inside the tubes. The water sides shall be designed for a minimum of 145 psig. Evaporator shall be designed for 30%Turn down ratio on nominal flow rate. The water connections for the evaporator and condenser shall be grooved suitable for Victaulic couplings or flanged. Vents and drains shall be provided. The refrigerant side of each vessel shall bear the ASME Code stamp, code case section VII. Vessels shall pass a test pressure of 1.1 times the working pressure but not less than 100 psig. Provide intermediate tube supports spaced to enable equal liquid and gas flow across multiple compressor suction ports. The evaporator water connections shall also be equipped with right-hand or left-hand connection, interchangeable.
2. The evaporator shall be provided with spring loaded reseating-type dual pressure relief valves according to ASHRAE-15. Rupture disks are not acceptable.
3. A perforated plate designed for vapor disengagement shall be installed inside the evaporator above the tubing to assure effective liquid droplet removal to prevent liquid damage to compressors and equalized suction pressure across evaporators with multiple compressors.
4. Tubes shall be individually replaceable and have internally and externally enhanced surfaces designed for refrigeration duty. Tubes shall be mechanically roller expanded into steel tube sheets containing a minimum of three concentric grooves.
6. Provide factory-mounted and wired, thermal dispersion switches water flow switches on evaporator to prevent unit operation with no water flow.
Optional:
1. Corrosion protection coating of water boxesshall use sprayed aluminum metallization and epoxy coat. . Corrosion protection treatment shall be based on TAFA arc sprayed aluminum method capable of providing effective long term corrosion protection. Metallized coating serves as sacrificial anode to prevent corrosion of the steel even where the coating coverage is incomplete or suffers mechanical damage.
Coating methods with epoxy coat only shall not be accepted.
D. Air-Cooled Condenser:
1. Air cooled packaged chillers and controls shall be capable of reliable operation between 32°F and 105° ambient air temperature.
2. Air-cooled condensers coils shall utilize epoxy coated aluminum fins which shall meet ASTM B117 1000hr salt spray test. The coating shall be epoxy based type and shall effectively repel water and inhibits dust and bacterial accumulation.
3. Condenser coils frame shall be made of Marine Grade Aluminum alloy 5052 to offer corrosion resistance to marine atmospheres. In lieu of Marine Grade aluminum frame, manufacturer may provide fully dipped epoxy coated coil.
3. Condenser coils and fans shall be arranged such that one fan operates with one coil section so that the failure of a fan will not affect the CFM across any coil beyond that fan.
4. Condenser shall be equipped with an oversized liquid line and mechanical float to assure liquid sub-cooling necessary for effective cooling of the compressor.
5. Condenser shall be equipped with packaged variable speed fans capable of delivering minimum of 14,000 CFM and maximum 890 rpm. The fans shall have a minimum diameter of 910 mm in order to provide higher air flow at lower speed and lower noise level. The sound pressure level at highest speed shall not exceed 68 dB(A) in the inlet side
6. For installations at high altitudes or with restricted air, special High Flow type fans shall be used and shall be capable of delivering minimum of 14,800 CFM and maximum 1000 rpm. The fans shall have a minimum diameter of 910 mm in order to provide higher air flow at lower speed and lower noise level. The sound pressure level at highest speed shall not exceed 72dB(A) in the inlet side
7. Condenser fan motors shall be ECM type high efficiency, direct drive, 3-phase, insulation class “F”, current protected, Totally Enclosed Air Over (TEAO), double sealed and with permanently lubricated ball bearings.
8. The fans shall balanced dynamically and statically and direct drive. Also, the blades shall be corrosion resistant designed for low noise, full airfoil cross section, providing vertical air discharge from extended orifices. The guards shall be constructed of heavy duty 14 gauge steel and painted.
E. Air-Cooled Condenser with free cooling (optional)
1. Air cooled controls shall be capable of reliable operation between -40°F and 105° ambient air temperature. Condenser shall be sized for at both extremes.
2. Manufacturer shall supply a system that utilizes thermal effect of refrigerant at differential heat exchanger pressures for oil free centrifugal compressors to generate free cooling capacity. The design shall provide individual isolation of each condenser coil to properly stage on capacity as needed to maximize free cooling at low ambient.
3. Free cooling is integrated with the mechanical cooling.
4. Manufacturers providing free cooling systems that use glycol for the free cooling energy transfer medium must provide two separate heat exchangers to separate use of glycol system and refrigerant system. Change over between systems requiring controls, valves and installation shall be provided by the equipment manufacturer. Maintenance contract for additional glycol system including pumps shall be provided by manufacturer with parts and labor warranty of not less than 5 years.
Optional:
1. Fully coated system for condenser coil shall have passed a minimum of 5,000 hour salt spray test in accordance with ASTM standard B117.85. The Coating procedure shall be a 5 layer coating with each layer sprayed from different angle. Coating system shall include protection against micro-organism contamination that causes unwanted odors. Next to anti-corrosion protection and energy conservation of the total system, the coating shall prevent adhesion of dirt and growth of micro-organism shall also prevent chemical, galvanic and microbial corrosion.
2. Pre coated Fins - Nano-coating for condenser fin rated to 3,000 hour salt spray test in accordance with ASTM standard B117.85. Next to anti-corrosion protection, the nano-coating shall provide dust resistance capabilities to maintain a clean fin surface for prolonged heat transfer performance and best energy consumption savings. Nano-coating does not require high pressure cleaning.
3. Coastal coating option A: condenser coil nano coated fins that do not require high pressure cleaning, epoxy coated base frame, epoxy electrical panel and all sheet metal casing shall be epoxy coated. Coating material and process shall have passed a minimum of 3,000 hour salt spray test in accordance with ASTM standard B117.85.
4. Coastal coating option B: Epoxy coated condenser coil, epoxy coated base frame, epoxy electrical panel and all sheet metal casing shall be epoxy coated. Coating material and process shall have passed a minimum of 5,000 hour salt spray test in accordance with ASTM standard B117.85.
E. Split-Couple Vertical Inline Package Pumps with Integrated Controls (optional)
1. Supply and install as shown on plans and specifications, Armstrong Design Envelope IVS pumps. The pumps shall be single stage, single or double suction type, vertical inline design with integrated controls. The seal shall be serviceable without disturbing the motor or the piping connections. The capacities and characteristics shall be as outlined in the plans and specifications. The complete pump unit shall be labeled with ETL listing certification that the product conforms to UL Std 778 and is certified to CSA Std C22.2 No.108. Pumps shall have complete service access from top and side. Pump packages located underneath condenser coil sections are not acceptable.
2. Pump casing shall be constructed of ASTM A48 class 30 cast iron with ANSI 125 / PN16 flanges for working pressure below 175 psig (12 bar) at 150°F (66°C) and ASTM A536 ductile iron with ANSI 250 / PN25 flanges for working pressures to 375 psig (25 bar) at 150°F (66°C). The casing shall be hydrostatically tested to 150% maximum working pressure. The casing shall be radially split to allow removal of the rotating element without disturbing the pipe connections. The pump casing shall be drilled and tapped for gauge ports on both the suction and discharge connections and for a drain port at the bottom of the casing. The casing shall have an additional tapping on the discharge connection to allow for the installation of a seal flush line.
3. The pump shall have a factory installed vent/flush line to insure removal of trapped air from the casing and mechanical seal cooling. The vent/flush line shall run from the seal chamber to the pump discharge.
4. The impeller shall be bronze, fully enclosed type. The impeller shall be dynamically balanced to ANSI Grade G6.3 and shall be fitted to the shaft with a key. Two-plane balancing is required where installed impeller diameter is less than 6 times the impeller width.
5. The pump shaft shall be stainless steel.
6. The coupling is to be rigid spacer type constructed of high tensile aluminum alloy. The coupling is to be designed to be easily removed on site to reveal a space between the pump and motor shafts sufficient to remove all mechanical seal components for servicing and to be replaced without disturbing the pump or motor.
7. The pump shall be fitted with an outside balanced type mechanical seal, with Viton elastomers and antimony carbon (or resin-bonded carbon for potable water applications) vs. silicon carbide faces rated up to 250°F (121°C). A 316 stainless steel gland plate shall be provided with a factory installed flush line with manual vent.
8. The inlet and outlet ports on the casing shall be at least one size larger than the single pump size, so that both units may operate in parallel with no loss of single pump efficiency. Each port shall be fitted with a stainless steel isolation valve that allow the units to operate in parallel, or standby, yet may be used to isolate one pumping unit for servicing or removal, with the other pump still operating.
9. All split coupled pumps shall be provided with a lower seal chamber throttle bushing to ensure seals maintain positively cooling and lubrication.
10. If required to improve seal chamber cleanliness, supply in the flush line to the mechanical seal a 50 micron cartridge filter and sight flow indicator, to suit the working pressure encountered.
11. Alternately, supply in the flush line to the mechanical seal a maintenance-free sediment separator, with sight flow indicator for pump differential pressures exceeding 30 psig (or 200 kPa).
12. The motor frame shall be NEMA TC type. Motor enclosure is to be TEFC with NEMA Premium Efficiency 12.12 rating. Acceptable motor insulation for variable speed operation is NEMA MG-1 Part 31.
13. The variable frequency drive & controls shall be rated UL Type 4X and be an integral component of the
pumping unit.
14. The integrated VFD shall be of the VVC-PWM type providing near unity displacement power factor (cos Ø) without the need for external power factor correction capacitors at all loads and speeds. The VFD shall incorporate DC link chokes for the reduction of mains borne harmonic currents and to reduce the DC link ripple current thereby increasing the DC link capacitors lifetime. RFI filters will be fitted as standard to ensure the VFD meets low emission and immunity requirements.
15. VFD and motor protection shall include: motor phase to phase fault, motor phase to ground fault, loss of supply phase, over-voltage, under-voltage, motor over-temperature, inverter overload, over-current.
16. VFD shall have Sensorless control software to provide automatic speed control in variable volume
systems without the need for pump mounted (internal/external) or remotely mounted differential pressure sensor. The default operating mode under Sensorless control shall be Quadratic Pressure Control (QPC) whereby head reduction with reducing flow will be according to a quadratic control curve, the head at minimum flow being 40% of the design duty head. Control mode setting and minimum/maximum head setpoints shall be user adjustable via a built-in programming interface.
17. The VFD shall have the following additional features:
> Sensorless override for BAS/BMS control signal
> Manual pump control or closed loop PID control
> Programmable skip frequencies and adjustable switching frequency for noise and vibration control
> Auto alarm reset
> Four programmable digital inputs, two analog inputs, one programmable analog / digital output
> One volt-free contact
> One RS485 port for serial communications to building management systems
> Standard serial communication protocols Modbus RTU (default), Johnson Controls Metasys N2, or Siemens FLN
Environmental Ratings
> Temperature: 14°F to 113°F up to 3300 ft (-10°C to 45°C up to 1000 m)
> Max Relative Humidity: 0 to 95%
F. Liquid level controls
1. Control of refrigerant flow shall utilize a single or multiple 6,000 step electronic expansion valve (EXV), to operate within the full range from full load to the lowest loading capacity for the chiller. Fixed orifice metering devices or float controls using hot gas bypass are not acceptable. The EXV liquid line shall have a sight glass with moisture indicator and temperature sensor connected to control system for validation of sub-cooling.
2. The EXV valve shall be controlled by evaporator level float control for better efficiency and to avoid compressor slugging. Systems provided using compressor refrigerant sensors for EXV superheat control shall be required to provide quarterly calibration report thru an authorized service contractor. Calibration service agreement with service contractor shall be provided with submittal documentation.
3. Evaporator shall be provided with a capacitive type liquid level transducer with a resolution of not less than 1024 discrete steps. Transducer shall be wired to chiller control system. Evaporator liquid level measurement shall be used in electronic expansion valve control algorithm with a minimum level set point to ensure adequate liquid seal is maintained in condenser to provide compressor motor cooling during operation. Evaporator liquid level shall be clearly displayed on graphical operator interface in a minimum of two screens. Chillers without direct level measurement are prohibited due to possible over heating damage that may occur in compressors when liquid seal is lost.
G. Chiller Controls
The controller fitted to the oil-free centrifugal chiller package shall be an embedded real time microprocessor device that utilizes control software written specifically for chiller applications. User operation shall be accomplished using a panel mounted color touch-screen interface. The status of the compressors and all system parameters including compressor alarms and temperature trends shall be viewable.
1. Chiller control system shall have the capability to store one year of operational data. No less than 60 points of information shall be sampled at a maximum of 15 minute intervals.
2. Chiller control system shall have full web based remote control capability including the capability for remote operation and software updates.
3. There shall be a backup superheat control on inlet of the compressor in order to control the EXV in the event of a failure of the primary level sensing device.
Controller features must include the following:
1. Selectable control mode – leaving chilled water, entering chilled water or suction pressure control.
2. 12 inch, 65,000 colors, touch panel operator interface operating windows XP embedded.
3. Chiller documentation shall be viewable via touch panel in pdf format.
4. Operator interface shall be capable of connecting directly to compressors via serial communication protocol and display compressor information using Turbocor compressor monitoring/ commissioning software.
5. Chiller control panel shall contain a minimum of three processors; all control functionality shall be carried out on a dedicated real time processor and data served to a remote graphical user interface via an open Ethernet protocol. Proprietary protocols between any pc based or micro based processor strictly prohibited.
6. Optional native BacNet capable via IP.
7. Chiller control shall be capable of controlling up to eight Turbocor compressors on up to eight individual refrigerant circuits serving the same chilled water stream.
8. Chiller control panel user interface shall be capable of remote control via an internet connection without the use of any third party gateway device or additional hardware or software.
9. Chiller control shall be able to operate in headless mode (no touch panel connected) and utilize standard windows XP or higher computer to display user interface via Ethernet connection.
10. Ability to place all outputs in a manual state (hand, off, auto) via graphical user interface.
11. Alarm screen shall be capable of filtering faults into specific categories such as compressor, chiller and system faults in order to provide rapid diagnosis and separation of failure modes.
12. Ability to turn on/off duty standby chilled water pumps.
13. Ability to operate chiller isolation valves for both evaporator.
14. Multiple compressors staging algorithm shall operate at the optimized power curves of each compressor simultaneously and shall reset automatically every second during operation. Compressor staging methods that operates using simple incremental percent of demand shall not be accepted.
15. Continuous data logging for operational trending and bin analysis shall be exportable to “CSV” format. (12 months data stored).
16. Built-in stepper motor controls for EXVs
17. Controls lockup protection
18. Ramp rate control - Peak energy demand limiting algorithms.
19. Three levels of alarm safety for minimum chiller down time
20. Chiller control software shall employ an active fault avoidance algorithm to reduce chiller capacity and/or power level in the case the chiller approaches within 10% of any trip limit value such as suction pressure, discharge pressure, chiller amp limit, leaving chilled water temperature limit etc...
21. Store up to 32,000 alarm and fault events stored with date / time stamp.
22. Real time data trending viewable via Touch panel.
23. Chiller load profile charts viewable via Touch panel.
24. Chiller control graphical user interface shall be capable of displaying data in SI or I-P units without affecting control or BAS protocol units.
25. Controls shall identify within 60 seconds a compressor that is not starting or ramping properly. Upon this identification, the compressor shall be disabled, the remaining compressors shall be operated in an optimized fashion and an alarm shall be sent to alert the operator.
26. Chiller faults (14) possible conditions.
27. Each compressor alarm (9) possible conditions.
28. Each compressor fault (13) possible conditions.
29. Each compressor bearing fault (8) possible conditions.
30. Each compressor bearing fault (16) possible conditions.
31. Each compressor IGV position.
Optional:
1. BMS interface module for the interface with BacNET MSTP, BacNET IP or LonTalk FT10.
2. Low ambient start down to 0 F shall be provided and not require the use of crankcase oil heaters. Systems provided with crankcase heaters for low ambient shall be required to provide separate power entry connection and power consumption summary reporting capability of heat trace by either BMS or chiller control panel. Low ambient start configuration shall be provided with factory mounted and wired heat trace on the evaporator vessel.
Data on Main Display Screen shall include (& shall communicate via protocol):
a) Entering and leaving chilled water temperatures.
b) Ambient air temperature
c) (7) states available
d) Active timers
e) Chiller enable status
f) Chiller water flow proof status
g) Indication of compressor readiness
h) Indication of clearance to run
i) Chiller set point
j) Total chiller kW
k) Total chiller current input
l) Three pages of data trends with zoom functionality
m) Graphical dial indicators that clearly indicate safe and unsafe operating values
n) Graphical representation of evaporator and condenser showing gas movement when chiller is running.
o) Current alarms (announce and manual reset provision)
p) Compressor actual rpm, maximum rpm, minimum rpm
q) Compressor alarm description & fault description
r) Compressor percentage motor demand.
s) Compressor safety interlock status
t) Compressor modbus communication health status
u) Compressor suction and discharge pressures
v) Compressor suction and discharge temperatures
w) Compressor internal cooling system temperatures and status.
x) Compressor motor kW and amps.
y) Compressor pressure ratio.
EXECUTION
3.1 INSTALLATION
A. Install per manufacturer’s IOM documentation, shop drawings, and submittal documents.
B. Align chiller on foundations or mounting rails as specified on drawings.
C. Arrange piping to enable dismantling and permit head removal for tube cleaning.
D. Coordinate electrical installation with electrical contractor.
E. Coordinate controls and BMS interface with controls contractor.
F. Provide all material required for a fully operational and functional chiller.
3.2 START-UP
A. Units shall be field charged with HFC-134a refrigerant.
B. Factory Start-Up Services: Provide factory supervised start-up on-site for a minimum of two working days ensure proper operation of the equipment. During the period of start-up, the factory authorized technician shall instruct the owner’s representative in proper care and operation of the equipment.
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