On sections marked as OPTIONAL, please choose the option that matches project requirements.
SECTION XXXXXX –DRY 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 dry 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.
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 UL60335-2-40.
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 that fail in materials or workmanship within specified warranty period:
1.	Entire Unit:  One-year warranty after start-up, or eighteen months from date of shipment, whichever occurs first. Warranty to include coverage for defects in material and workmanship.

2.	Fans, fan shafts, bearings, sheaves, gearboxes, drive shafts, couplings, and mechanical equipment support must be warranted against defects in materials and workmanship for a period of five (5) years.  Mechanical equipment warranty is extended to seven (7) years, if motor space heater is properly wired or trickle current feature is utilized with provided control panel.

PART 2 - 	PRODUCTS
2.1	DRY FLUID COOLERS
A.	The unit must be provided with a full controls package that provides modes to optimize energy savings and reduce maintenance.  The controls will be integral to unit operation with single point power connection. 
[OPTIONAL in lieu of factory controls] The unit must be provided with a factory wired terminal box containing terminations for the fan motors and vibration cutout switches.
B.	Manufacturers: Subject to compliance with requirements, provide dry fluid cooler manufactured by one of the following:
1.	Baltimore Aircoil Company (BAC): TrilliumSeriesTM Dry 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 shall be shipped in two sections with the factory wired control panel or terminal box installed on the upper section.
2.4	MATERIALS OF CONSTRUCTION
A.	Casing and Frame: Unless otherwise noted in this specification, all steel panels and structural members must be constructed of G-235 galvanized steel.
B.	[OPTIONAL] Provide solid bottom panels constructed of G-235 galvanized steel if unit is to be mounted on elevated support steel instead of a solid pad.
C.	Coils
1.	The coils are constructed of copper tubing with aluminum fins with a free draining design. [OPTIONAL] The aluminum fins are epoxy coated for increased corrosion resistance.
2.	Provide coil with a maximum allowable working pressure of 200 psi. 
a.	Coil connections to be grooved for mechanical coupling and capped for shipment. 
b.	During the unit assembly process, the coils shall be charged with nitrogen to 15 psi to provide assurance of coil integrity throughout the manufacturing process.  Prior to shipment, the nitrogen shall be released and coil connections capped.

3.	Provide coil design tested according to UL 207.

2.5	COMPONENTS
A.	Fans: 
1.	Multi-blade, axial type fans must be factory test-mounted, balanced, and aligned to ensure reliable operation and ease of maintenance. Fan type will be selected to meet sound ratings published on equipment schedule. 
B.	Fan Motors:
1.	Single speed, premium efficiency motor mounted on adjustable steel base and suitable for the environment inside the dry cooler. Fan motors will be inverter duty type designed per NEMA Standard MG1, Section IV Part 31. 

2.	Fan motors shall be factory installed and wired with UL and CE markings. 
3.	Fan motors will have a minimum ingress protection of IP55 or better.
4.	Fan motors will have maintenance-free, permanently lubricated, sealed ball bearings. 
5.	Fan motors will have a minimum service factor of 1.0. 
6.	Motor Insulation is Class H.
7.	[OPTIONAL in lieu of factory controls] Motors will include an internal space heater that can be activated to remove condensation from inside motor when fans are not in operation.  Motor space heater to be factory wired to terminal box.
C.	Fan Motor Speed Controls:  
1.	The included controls shall interface with the building automation system by any of the following communication protocols:
a.	Modbus RTU (RS485)
b.	Modbus TCP/IP
c.	BACnet MS/TP
d.	BACnet IP
2.	Controls to be factory installed and tested.
3.	Controls enclosure to be NEMA 4 rated with lockable window for access to the PLC and HMI. 
4.	Enclosure to be suitable for operation in ambient dry bulb temperatures of -20°F to 122°F.
5.	Enclosure to be UL listed.
6.	Ship all pertinent wiring diagrams with controls enclosure.
7.	Field wiring of the controls to be performed by installing contractor.

2.6	SOUND
A.	Sound levels will be based on CTI ATC-128 2019 standard.
2.7	ACCESS
A.	The unit will have large, hinged access door(s) that allow for easy ingress to interior of unit without the use of ladders and platforms. Access door opening(s) to be at least 71-inces tall and 29-inches wide.
B.	An Internal access platform shall include a platform, support material compatible with the basic unit material of construction, aluminum ladder(s) and galvanized steel pipe safety railing. The platform shall provide access to the fan drive components while meeting pertinent OSHA standards.
C.	An external service platform with aluminum access ladder and galvanized steel pipe safety railing shall be provided as a means of safe and convenient access to equipment controls.  The platform shall meet all pertinent OSHA standards.  Field installation by others.  [OPTIONAL – Delete this requirement if factory control panel is omitted]
2.8	[OPTIONAL- Delete if coil hail guards are not included] COIL PROTECTION
D.	Factory-installed hail guards will be included to protect the coils from hail. They are constructed of G-235 (Z700 metric) galvanized steel frames and woven intercrimp wire mesh cloth with 3/4″ centers and 0.080″ wire diameter.  

PART 3 –CONTROL SYSTEM FOR THE DRY FLUID COOLER 2.9	GENERAL
3.1	GENERAL
A.	Scope:  The fluid 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 fan motors. 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. 
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 100 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.	Fused Disconnect switch with Class J time delay fuses. 
d.	Control Power Transformer 
e.	Relays, Fuses and Circuit Breakers for All Unit Equipment 
f.	Color Touchscreen User Interface 
g.	Available communication protocols for connection to Building Automation System (BAS):
i.	Modbus capabilities with RS485 connection for connection to Building Automation System (BAS).
ii.	Modbus TCP/IP communication protocol to a Building Automation System (BAS).
iii.	BACnet MS/TP communication protocol to a Building Automation System (BAS).
iv.	BACnet IP communication protocol to a Building Automation System (BAS).

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/CUL. 
H.	Operation 
1.	Fail-safe: The unit will operate, by default, to have the fans ‘fail off’ in order to prevent damage to unit. This setting will be end user programmable to meet site requirements.
2.	Self Clean Cycle
a.	Self Clean Cycle can be manually started or scheduled. 
b.	The fans will reverse direction to blow debris off the coils. This mode will function without human intervention.
3.	Night Quiet Mode
a.	The night quiet mode limits the maximum fan speed [% maximum fan speed] when active to reduce sound levels during a given daily time period.
b.	Feature shall be activated by either an override flag on the HMI, BMS, or via a schedule.
3.2	Installation 
A.	Install in accordance with manufacturer's instructions.
B.	Unit to be installed on concrete pad or raised on support steel per manufacturer's recommendations.  If unit is to be installed on support steel, solid bottom panels shall be provided.
C.	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 cooler must be provided by others. 
D.	Control panel enclosure must be mounted on the fluid 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. [OPTIONAL – Delete this requirement if factory installed control panel is omitted]
B.	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 #18 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.
C.	Field Piping
1.	Proper clearance in front of the equipment shall be maintained when installing piping to comply with the NEC and local ordinances

END OF SECTION XXXXXXXX