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SECTION XXXXXX –FLUID COOLERS
PART 1 - 	GENERAL
1.1	RELATED DOCUMENTS
A.  	Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this Section.
1.2	SUMMARY
A.	Section Includes:
1.	This Section includes factory assembled and tested adiabatic fluid coolers. 
1.3	SUBMITTALS
A.	Product Data: For each type of product indicated include rated capacities, pressure drop, furnished specialties, and accessories.
B.	Shop Drawings: Complete set of manufacturer's prints of equipment assemblies, control panels, sections and elevations. Include the following: 
1.	Assembled unit dimensions. 
2.	Weight and load distribution. 
3.	Sizes and locations of piping and wiring connections. 
4.	Wiring Diagrams: For power, signal, and control wiring. Differentiate between manufacturer installed and field installed wiring. 
5.	Fan horsepower.
6.	Pump horsepower.
1.4	QUALITY ASSURANCE
A.	Verification of Performance: The entire unit and controls package shall be factory-wired and tested for correct operation. 
1.	The control panel shall be listed as UL 508A.
2.	The unit must be listed to UL1995.
3.	Unit must be manufactured in the United States.
1.5	WARRANTY
A.	Special Warranty: Manufacturer's standard form in which manufacturer agrees to repair or replace the following components of cooling towers that fail in materials or workmanship within specified warranty period:
1.	Entire Unit:  The entire unit shall have a comprehensive two (2) year parts warranty against defects in materials and workmanship from startup, not to exceed thirty (30) months from date of shipment.  
PART 2 - 	PRODUCTS
2.1	ADIABATIC FLUID COOLERS
A.	The unit must be provided with a full controls package that provides modes to optimize water and energy savings and eliminates any potential for freezing in cold weather climates.  The controls will be integral to unit operation with single point power connection. The unit must use recirculating pumps to avoid unnecessarily draining substantial amounts of water.
1.	Unit will comply with LEED v4, Building Design and Construction Water Efficiency (WE) Prerequisite. Once-through cooling with potable water for any equipment or appliances that reject heat will not be accepted. 
B.	Manufacturers: Subject to compliance with requirements, provide adiabatic fluid cooler manufactured by one of the following:
1.	Baltimore Aircoil Company (BAC): TrilliumSeriesTM Adiabatic Cooler 
2.	Approved Equal. Prior approval of full submittal required from engineer of record. 
2.2	WIND AND SEISMIC
A.	See equipment schedule and notes for requirements. 
2.3	RIGGING AND INSTALLATION
A.	The unit and controls are to be shipped fully assembled to allow for a single lift installation by the rigger.
2.4	MATERIALS OF CONSTRUCTION
A.	Casing and Frame:  
1.	Unless otherwise noted in this specification, provide all steel panels and structural members protected with a thermosetting hybrid polymer (THP) coating system.  Type 304 stainless steel is considered an acceptable alternative. Uncoated or painted G-235 galvanized steel is not acceptable.
2.	The THP system will consist of G-235 (Z700 metric) hot-dip galvanized steel prepared in a four-step (clean, pre-treat, rinse, dry) process. The coating will be electrostatically applied with the THP fuse-bonded to the substrate during a thermally activated curing stage. Quality will be monitored by a 23-step quality assurance program. Other coatings must be submitted to the engineer for pre-approval. Approved equals must have undergone testing, with the criteria specified below as a minimum: 
a.	When X-scribed to the steel substrate it shall be able to withstand 6000 hours of 5% salt spray per ASTM B117 without blistering, chipping, or loss of adhesion.
b.	When X-scribed to the steel substrate it shall be able to withstand 6000 hours of exposure to acidic (pH=4.0) and alkaline (pH=11.0) water solutions at 95ºF (35°C) without signs of chemical attack.
c.	Withstand impact of 160 in-lbs per ASTM D2794 without fracture or delamination of the polymer layer.
d.	Withstand 6000 hours of ultraviolet radiation equivalent to 120,000 hours of noontime sun exposure without loss of functional properties.
e.	Withstand 200 thermal shock cycles between -25ºF and +180ºF (-32°C and 82°C) without loss of adhesion or other deterioration.
f.	Withstand 6000 hours of exposure to 60 psi (42,184 kg/m2) water jet without signs of wear or erosion.
3.	Fasteners shall be protected by a GM7114M coating.  
B.	Coils
1.	The coils are constructed of copper tubing with aluminum fins with a free draining design. The coils will be protected with a flexible epoxy polymer electrocoating after fabrication for maximum longevity. 
a.	The coating must be tested for 6900 hours per ASTM G85 A3 for corrosion resistance.
b.	Coating impact resistance must be a minimum of 120 in lbs.
2.	Provide coil with a maximum allowable working pressure of 200 psi. 
a.	Coils built with ASME 150 flange connections will be rated for 150 psi.

3.	Provide coil design tested according to UL 207.
4.	OPTIONAL – Prior to shipment, coils will be charged with nitrogen to 15 psi to provide assurance of coil integrity upon customer receipt of product. 
C.	Water-System:  
1.	Products that do not conserve water by collecting and reusing water are not acceptable.
2.	All components that collect water must be constructed of Type 304 stainless steel or higher grade. 
3.	All wetted components, except Pre-Cooler pads, must be constructed of Type 304 stainless steel or of polyvinyl chloride (PVC).
4.	The collection basin will allow no water to be exposed to sunlight.
5.	The water distribution system will have multiple partitions designed to ensure optimal water distribution over the entire length of the pre-cooler pads. Required number of partitions will be based on number of fans on a single piece unit per the below table.
Number of Fans per Unit	Required Number of Partitioned Water Distribution Sections	
4	4	
6-10	6	
12	8	
14-18	10	

6.	Both the water collection basin and distribution piping must be able to be inspected while the unit is in operation. 
2.5	COMPONENTS
A.	Circulation Pump: 
1.	Unit must have a factory-wired submersible water pump rated for continuous duty. For optimum water savings, products that do not reuse water are not acceptable. 
2.	The unit must have at least two (2) pumps to provide redundancy and the ability to run unit half in adiabatic mode and half in dry mode for optimal energy savings.
3.	The pump will be installed in a vertical position so that water will drain from the pump when the system is emptied.
4.	Pump motor is to be totally enclosed with protective canopy for outdoor operation. 
5.	The pump must have Class F insulation, UL labeling, and a minimum ingress protection of IP68.  
6.	Construct exterior pump casing of Type 304 stainless steel.
7.	Impeller must be made of 304L stainless steel.
8.	The water pump shall have an automatic reset with thermal overload protection.
B.	Make-Up Water Valves:
1.	Provide solenoid actuated, slow-closing make-up valve to maintain proper water level in the unit, and to prevent water hammer in the building.
2.	Electronically operated make-up and drain line allow for periodic draining of the basin to control water quality.
3.	Make-up Water Strainer: To protect downstream components, an in-line Y strainer must be supplied on make-up water supply. Strainer will have a brass body and 304 stainless steel strainer. 
C.	Drain Valve
1.	Provide a normally-open drain valve that ensures in case of power failure no water is contained in the unit.
D.	Adiabatic Pre-Cooler Pads:
1.	Pads must be at least 6 inches thick to maximize heat transfer and lower the air temperature reaching the coils. 
2.	Pads will be removable without the use of any tools, for easy coil inspection. Pad removal must be facilitated by including steel partitions between one section of media to avoid friction and premature failure of pad.
3.	Pads will be made of recycled material with cross-fluted design to prevent biological degradation and clogging. Media will be easily removed and easy to clean. Outside of pads will have edge-coating for UV-protection. 
E.	Fans: 
1.	Fans must be constructed of an aluminum alloy designed to meet or exceed standard DIN EN 485-2, protected with an epoxy coating. 
2.	Fans must be provided with a wire-mesh screens complying with OSHA and UL regulations.
3.	Balancing:  Fans must be both statically and dynamically balanced to provide for vibration-free performance. Fans will have maximum residual balance as per DIN ISO 1940. 
F.	Fan Motors:
1.	Fan motors shall be factory installed and wired and shall be electronically commutated (EC) with UL and CE markings. 
2.	Fan motor efficiency at full load: 92%
3.	Motors shall have space heaters or trickle current provision to prevent condensation inside the motor. The heater shall operate automatically from the factory and require no extra wiring.
4.	Fan motors will have a minimum ingress protection of IP55 or better.
5.	Fan motors will have maintenance-free, permanently-lubricated, sealed ball bearings. 
6.	Fan motors will operate with integrated commutation electronics offering high efficiency across the entire speed range and optimal acoustic performance at minimal installation expenditure. 
7.	Fan Motors will have an integrated variable speed controller (VSC).
8.	Fan motors will be thermal overload protected (TOP).
9.	Fan motors will have integrated PFC filter which complies with IEC 61000-3-2.
10.	Fan motors will have integrated phase loss protection.
11.	Fan motors are to be UL listed to UL1004 and/or UL2111, CSA C22.2 No. 77 and/or No.100. 9. 
12.	Fan motors will have a minimum service factor of 1.0. 
13.	Motor Insulation is Type F.
14.	Variable-Speed Motors: Inverter-duty rated per NEMA MG-1, Section IV, "Performance Standard Applying to All Machines," Part 31, "Definite-Purpose, Inverter-Fed, Polyphase Motors."
15.	Fan Motor Speed Controller:  The fan controller shall allow the user to control the fan speed the following ways:
a.	 RS485 ModBus communication port with both read and write capabilities (Default).
b.	Analog Input (0-10VDC, 10-0VDC or 4-20mA)
G.	Fan System Protection 
1.	Provide factory-wired integral electronics within the motors that will detect upset conditions, prompting the factory-provided controls to shut down the fan motors in that specific module and issue an alarm warning to alert the Operator to check the fan.  
2.6	SOUND
A.	Sound levels will be based on CTI ATC-128 2019 standard.
2.7	ACCESS
A.	The unit will have one large, hinged access door that allows for easy ingress to interior of unit without the use of ladders and platforms. 
B.	One section of the pads must have a hinged door for easy access to the basin sump.

PART 3 – WATER AND ENERGY CONSERVATION CONTROL SYSTEM FOR THE ADIABATIC FLUID COOLER2.8	GENERAL
3.1	GENERAL
A.	Scope:  The adiabatic cooler manufacturer shall furnish an industrial control panel for use with the specified unit. The panel must be integral to the unit’s operation. 
B.	Terminology 
1.	UI – User Interface 
2.	PLC – Programmable Logic Controller 
3.	BAS – Building Automation System 
4.	NCDC – National Climatic Data Center 
5.	VFD – Variable Frequency Drive 
6.	I/O – Input(s)/Output(s) 
7.	SCCR – Short Circuit Current Rating 
The manufacturer shall not be responsible for field wiring between the control panel and field devices or between the control panel(s) and the BAS as indicated by the drawings. Wiring for power and communication to BAS is by others. 
C.	Device Description 
The integral control system will control all motor driven and optional electrically operated equipment including (but not limited to) the fan motors, pump motors, make-up and drain valve(s), and manufacturer supplied water level switches. The operation of all driven components must be manually overridden for equipment startup or troubleshooting. The status of all equipment must be available to be displayed on a panel mounted user interface with a color touchscreen and intuitive controls. The control system will have multiple integrated control strategies to match any process needs at minimal operating costs.
D.	Submittals and Operations Manuals 
1.	Submittals shall include the following as a minimum: 
a.	System design information sheet. 
b.	Description of system operation. 
c.	Control panel drawing with list of operator interfaces. 
d.	Electrical power and control-wiring diagrams for customer connections.
e.	Submittals, which are not job specific and designed to meet the requirements of this section, will not be acceptable.
f.	Provide an electronic copy of the submittal to the consulting engineer for approval. 
g.	Provide an electronic copy of the Operation and Maintenance Manual prior to system start-up. 
E.	Electrical 
1.	Design Requirements 
a.	The control panel manufacturer shall be listed by Underwriters Laboratories as an approved manufacturer of industrial control panels. Use of commercial grade controllers from the building automation contractor shall not be acceptable.
b.	The control panel enclosure shall meet NEMA 4 requirements. 
c.	The equipment control system shall have a Short Circuit Current Rating (SCCR) of a minimum of 65 kA at 460 VAC.
d.	Control panel must be rated for use up to 122°F (50°C) ambient dry bulb temperatures. 
2.	Control panel will include the following equipment: 
a.	Programmable Logic Controller (PLC) 
b.	Ambient Dry Bulb Sensor(s) [1 per unit.] Refer to contract documents for quantity and location. 
c.	Circulation Pump Motor Starter(s)
d.	Main Circuit Breaker Disconnect 
e.	Control Power Transformer 
f.	Basin Water Level Sensors
g.	Relays, Fuses and Circuit Breakers for All Unit Equipment 
h.	Color Touchscreen User Interface 
i.	Modbus capabilities with RS485 connection for connection to Building Automation System (BAS).
j.	OPTIONAL – BACnet MS/TP communication protocol to a Building Automation System (BAS).
k.	OPTIONAL - BACnet IP communication protocol to a Building Automation System (BAS).
3.	Circuit Breaker Disconnect 
a.	Molded case circuit breaker disconnect shall provide circuit overcurrent protection with inverse time and instantaneous tripping characteristics and shall be adequately sized for all loads present in the panel enclosure. Circuit breaker shall be UL 489 Listed, CSA, IEC certified/rated and CE marked for global acceptance. 
F.	Relays 
1.	Relays shall be of the plug-in base or terminal block type. Relays shall be rated for continuous duty operation. 
G.	User Interface (UI) 
1.	Provide color touchscreen operator display as a stand-alone component with a separate programmable logic controller. Use of a computer for the process control will not be acceptable.
2.	Unit must have the ability to be adjusted while in operation without cutting power.
3.	The UI must be provided either within or directly on a weather-tight cover mounted door of a NEMA 4 enclosure such that it will maintain the enclosure’s NEMA 4 rating.  The UI must be accessible while the unit is in operation, without shutting off the unit.
4.	The UI shall be industrially rated and certified for the following conditions: 
a.	Relative Humidity: 5 to 95% (Non-condensing) 
b.	UI shall be rated for 50,000 hours of life 
c.	The UI shall be industrially rated and certified for UL/ULC. 
H.	Operation 
1.	The controls will allow for three modes of operation to allow optimization of water and energy savings. For all supported modes of operation, the panel shall utilize adaptive logic to allow for automatic adjustment between unit modes of operation based on real time system load and ambient temperature conditions. 
2.	Modes of Operation: 
a.	Standard Mode: When a preset outside air temperature is reached, water will be used to pre-cool incoming air to increase the unit’s capacity and efficiency. 
b.	Water Saver Logic: The controller will optimize the unit’s efficiency and only use water when the conditions require the extra cooling capacity. Pre-Cooler Mode will be initiated only when the outside air temperature is above the switch point and the leaving fluid temperature is greater than or equal to the leaving fluid temperature setpoint plus a differential.
c.	Energy Saver Logic: The controller will optimize its sequence so that the least amount of energy is consumed to meet the present load of the unit. Pre-Cooler Mode will be initiated at 10°F (5.6°C) below the switch point and leaving fluid temperature is greater than or equal to the leaving fluid temperature setpoint plus a differential.
3.	On off-peak days when the water distribution is on, pads are fully wetted, and the full pad efficiency is maintained/utilized. In this way the lowest leaving fluid temperature is achieved, delivering the maximum system efficiency.
4.	Failsafes
a.	The unit will operate, by default, to have the fans ‘fail off’ in order to prevent damage to unit. 
b.	Unit will not operate wet when the outside air temperature is below 40F or a customer-defined temperature.
5.	Self Clean Cycle
a.	Self Clean Cycle can be manually started or scheduled. 
b.	The fans will reverse direction to blow debris off the pads and coil. This mode will function without human intervention.
6.	Daily Dry Operation
a.	The Daily Dry Operation can be manually started or scheduled. 
b.	If enabled, once per day, regardless of climate, the unit will force dry operation (if not otherwise already running dry) and drain the basin to dry the pads and maintain pad performance and longevity. 
c.	The control system must drain and flush itself in such a way that the need for water treatment is eliminated, provided that the incoming water is not contaminated. 
7.	Daily Pad Clean Cycle
a.	The Pad Clean Cycle can be manually started or scheduled. 
b.	If enabled, once per day, regardless of climate, the unit will flush the pads of any debris to maintain pad performance and longevity. 
c.	The control system must flush itself in such a way that the need for water treatment is eliminated, provided the incoming water is not contaminated
3.2	Installation 
A.	All wiring to the control panel shall be installed by a licensed electrician. The National Electrical Code and all applicable state and local codes shall be followed when installing this equipment. All power, control and sensor field wiring between the control panel and the adiabatic cooler must be provided by others. 
B.	Control panel enclosure must be mounted on the adiabatic cooler. Separate brackets or stands are not acceptable.  
3.3	Testing/Commission
A.	Factory Testing 
1.	All inputs and outputs to the PLC must be tested for proper function at the point of field wiring. 
2.	The Control system will be tested and setup to the customer’s specific project. 
B.	OPTIONAL On-Site Commissioning (By Manufacturer) 
1.	All field wiring shall be verified according to best wiring practices. 
2.	All field wiring to remote sensors and devices shall be verified according to recommended wiring practices as detailed in manufacturer's wiring diagram. 
3.	Rotation of all motors shall be verified for correct direction. 
4.	Fan and pump motors amperage shall be measured and confirmed to be within motor ratings. 
5.	Wiring to Building Automation System (if necessary) shall be verified for correctness. 
6.	Job specific set points shall be programmed according to Customer’s requirements. 
7.	Proper operation between the Manufacturer's supplied control system and unit shall be verified. 
8.	Control system shall be “tuned” for the customer’s specific system. 
9.	Owner / Operator training on the system 
C.	Field Wiring (By Others)
1.	Refer to Manufacturer's electrical drawings for all required field wiring. 
2.	Electrical wiring best practices shall be followed.
3.	All discrete control wiring shall be a minimum of #14 AWG, 600 V minimum insulation and 75°C minimum temperature rating. 
4.	All signal wires (i.e. 4-20 mA) shall be #18 AWG stranded copper, shielded, twisted pair unless otherwise specified. 
5.	All field wiring shall have the same ground reference for all connected control panels. 
6.	Analog and signal wires (i.e. 4-20mA) shall be shielded individually and only grounded on the panel side.
D.	Field Piping
1.	Proper clearance in front of the equipment shall be maintained when piping, to comply with the NEC and local ordinances

END OF SECTION XXXXXXXX