Project Manual - Arkansas Tech University ATU HVAC - MECHANIC… · E. Acoustics: Sound pressure levels for the unit shall not exceed the following specified levels. All manufacturers

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Project Manual

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February 21, 2018MAHG PROJECT No. 17-12

2018MAHG

ARCHITECTURE, INC.

2.21.2018

tbartlett

Text Box

MECHANICAL ONLY

MAHG Project # 17-12 1 Project Data

PROJECT DATA

OWNER: Arkansas Tech University 203 West “0” Street Russellville, Arkansas 72801-2222 Contact: Galen Rounsaville, Construction Manager ARCHITECT: MAHG Architecture, Inc.

6400 Riley Park Dr. Fort Smith, AR 72916 Contact: Travis R. Bartlett, AIA P: 479.782.1051 [email protected]

MECHANICAL/ELECTRICAL Pettit & Pettit Consulting Engineers, Inc ENGINEERS: Heritage West Building 201 West Markham, Suite 400 Little Rock, AR 72201 Contact: Tony Aycock, PE P: 501.374.3731

mailto:[email protected]

MAHG Project # 17-12 1 Index

PROJECT MANUAL INDEX

SECTION TITLE PAGES

23 62 23 Air-Cooled Water Chiller 1 - 7 23 73 13 Modular Central Station Air Handling Units 1 – 8 23 82 19 Fan Coil Units 1 – 6

MAHG Project # 17-12 23 62 23 - 2 Air-Cooled Water Chillers

SECTION 23 62 23 – AIR-COOLED WATER CHILLER PART 1 - GENERAL 1.01 SUMMARY

A. Section includes design, performance criteria, refrigerants, controls, and installation requirements for air-cooled scroll compressor chillers.

1.02 REFERENCES

A. Comply with applicable Standards/Codes of AHRI 550/590, ANSI/ASHRAE 15, ETL, cETL, NEC, and OSHA as adopted by the State.

B. Units shall meet the efficiency standards of the current version of ASHRAE

Standard 90.1, and FEMP standard 2012. 1.03 SUBMITTALS

A. Submit shop drawings and product data in accordance with the specifications. B. Submittals shall include the following:

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

2. Summary of all auxiliary utility requirements such as electricity, water, etc. Summary shall indicate quality and quantity of each required utility.

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

4. Schematic diagram of control system indicating points for field interface/connection.

5. Diagram shall fully delineate field and factory wiring. 6. Installation and operating 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 type of equipment and refrigerant offered.

B. Regulatory Requirements: Comply with the codes and standards specified. C. Chiller manufacturer plant must be ISO Registered.

1.05 DELIVERY AND HANDLING

A. Chiller 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 equipment.


1.06 WARRANTY

A. Standard Warranty (Domestic): The refrigeration equipment manufacturer's guarantee shall be for a period of one year from date of equipment start-up but not more than 18 months from shipment. The guarantee shall provide for repair or replacement due to failure by material and workmanship that prove defective within the above period, excluding refrigerant.

B. 1st Year Labor Warranty: Entire unit C. Extended Compressor Warranty: Four (4) years extended compressor warranty,

parts only. D. Extended Unit Warranty: None. E. Refrigerant Warranty: One (1) year R410A refrigerant. F. Delay Warranty Start: None.

1.07 MAINTENANCE

A. Maintenance of the chillers shall be the responsibility of the owner and performed in accordance with the manufacturer’s instructions.

PART 2 - PRODUCTS 2.01 ACCEPTABLE MANUFACTURERS

A. Daikin Applied B. (Approved Equal)

2.02 UNIT DESCRIPTION

A. Provide and install as shown on the plans factory-assembled, factory-charged air-cooled scroll compressor packaged chillers in the quantity specified. Each chiller shall consist of hermetic tandem scroll compressor sets (total four compressors), brazed plate evaporator, air-cooled condenser section, microprocessor-based control system and all components necessary for controlled unit operation.

B. Chiller shall be functionally tested at the factory to ensure trouble free field

operation 2.03 DESIGN REQUIREMENTS

A. Flow Range: The chiller shall have the ability to support variable flow range down to 40% of nominal design (based on AHRI conditions).


B. Operating Range: The chiller shall have the ability to control leaving chilled fluid temperature from 15F to 65F.

C. General: Provide a complete scroll compressor packaged chiller as specified

herein and as shown on the drawings. The unit shall be in accordance with the standards referenced in section 1.02 and any local codes in effect.

D. Performance: Refer to the schedule of performance on the drawings. The chiller

shall be capable of stable operation to a minimum percentage of full load (without hot gas bypass) of 25%. Performance shall be in accordance with AHRI Standard 550/590.

E. Acoustics: Sound pressure levels for the unit shall not exceed the following

specified levels. All manufacturers shall provide the necessary sound treatment ( parts and labor) to meet these levels if required. Sound data shall be provided with the quotation. Test shall be in accordance with AHRI Standard 370.

2.04 CHILLER COMPONENTS

A. Compressor 1. The compressors shall be sealed hermetic, scroll type with crankcase oil

heater and suction strainer. The compressor motor shall be refrigerant gas cooled, high torque, hermetic induction type, two-pole, with inherent thermal protection on all three phases and shall be mounted on RIS vibration isolator pads. The compressors shall be equipped with an internal module providing compressor protection and communication capability.

B. Evaporator

1. The evaporator shall be a compact, high efficiency, dual circuit, brazed plate-to-plate type heat exchanger consisting of parallel stainless steel plates.

2. The evaporator shall be protected with an external, electric resistance heater plate and insulated with 3/4" (19mm) thick closed-cell polyurethane insulation. This combination shall provide freeze protection down to -20°F (-29°C) ambient air temperature.

3. The water-side maximum design pressure shall be rated at a minimum of 653 psig (4502 kPa). Evaporators shall be designed and constructed according to, and listed by Underwriters Laboratories (UL).


C. Condenser 1. Condenser fans shall be propeller type arranged for vertical air discharge

and individually driven by direct-drive fan motors. The fans shall be equipped with a heavy-gauge vinyl-coated fan guard. Fan motors shall be TEAO type with permanently lubricated ball bearings, inherent overload protection, three-phase, direct-drive, 1140 rpm. Each fan section shall be partitioned to avoid cross circulation.

2. Coil shall be microchannel design and shall have a series of flat tubes containing multiple, parallel flow microchannels layered between the refrigerant manifolds. Tubes shall be 9153 aluminum alloy. Tubes made of 3102 alloy or other alloys of lower corrosion resistance shall not be accepted. Coils shall consist of a two-pass arrangement. Each condenser coil shall be factory leak tested with high-pressure air under water. Coils shall withstand 1000+ hour acidified synthetic sea water fog (SWAAT) test (ASTM G85-02) at 120°F (49°C) with 0% fin loss and develop no leaks.

D. Refrigerant Circuit

1. Each of the two refrigerant circuits shall include a replaceable-core refrigerant filter-drier, sight glass with moisture indicator, liquid line solenoid valve (no exceptions), expansion valve, and insulated suction line.

E. Construction

1. Unit casing and all structural members and rails shall be fabricated of pre-painted or galvanized steel. Painted parts shall be able to meet ASTM B117, 1000-hour salt spray test.

2. Upper condenser coil section of unit shall have protective, 12 GA, PVC-coated, wire grille guards.

F. Control System

1. A centrally located weatherproof control panel shall contain the field power connection points, control interlock terminals, and control system. Box shall be designed in accordance with NEMA 3R rating. Power and starting components shall include factory circuit breaker for fan motors and control circuit, individual contactors for each fan motor, solid-state compressor three-phase motor overload protection, inherent fan motor overload protection and two power blocks (one per circuit) for connection to remote, contractor supplied disconnect switches. Hinged access doors shall be lockable. Barrier panels or separate enclosures are required to protect against accidental contact with line voltage when accessing the control system.

2. Shall include optional single-point connection to a non-fused disconnect switch with through-the-door handle and compressor circuit breakers.

G. Unit Controller

1. An advanced DDC microprocessor unit controller with a 5-line by 22-character liquid crystal display provides the operating and protection functions. The controller shall take preemptive limiting action in case of high discharge pressure or low evaporator pressure. The controller shall contain the following features as a minimum:


2. The unit shall be protected in two ways: (1) by alarms that shut the unit down and require manual reset to restore unit operation and (2) by limit alarms that reduce unit operation in response to some out-of-limit condition. Shut down alarms shall activate an alarm signal.

3. Shutdown Alarms a. No evaporator water flow (auto-restart) b. Sensor failures c. Low evaporator pressure d. Evaporator freeze protection e. High condenser pressure f. Outside ambient temperature (auto-restart) g. Motor protection system h. Phase voltage protection (Optional)

4. Limit Alarms a. Condenser pressure stage down, unloads unit at high discharge

pressures. b. Low ambient lockout, shuts off unit at low ambient temperatures. c. Low evaporator pressure hold, holds stage #1 until pressure rises. d. Low evaporator pressure unload, shuts off one compressor.

5. Unit Enable Section a. Enables unit operation from either local keypad, digital input, or

BAS 6. Unit Mode Selection

a. Selects standard cooling, ice, glycol, or test operation mode 7. Analog Inputs:

a. Reset of leaving water temperature, 4-20 mA\ b. Current Limit

8. Digital Inputs a. Unit off switch b. Remote start/stop c. Flow switch d. Ice mode switch, converts operation and setpoints for ice

production e. Motor protection

9. Digital Outputs a. Shutdown alarm; field wired, activates on an alarm condition, off

when alarm is cleared b. Evaporator pump; field wired, starts pump when unit is set to start

10. Condenser fan control - The unit controller shall provide control of condenser fans based on compressor discharge pressure.

11. Building Automation System (BAS) Interface a. Factory mounted DDC controller(s) shall support operation on a

BACnet®, Modbus® or LONMARK ® network via one of the data link / physical layers listed below as specified by the successful Building Automation System (BAS) supplier.

b. BACnet MS/TP master (Clause 9) c. BACnet IP, (Annex J) d. BACnet ISO 8802-3, (Ethernet) e. LONMARK FTT-10A. The unit controller shall be LONMARK®

certified.


f. The information communicated between the BAS and the factory mounted unit controllers shall include the reading and writing of data to allow unit monitoring, control and alarm notification as specified in the unit sequence of operation and the unit points list.

g. For chillers communicating over a LONMARK network, the corresponding LONMARK eXternal Interface File (XIF) shall be provided with the chiller submittal data.

h. All communication from the chiller unit controller as specified in the points list shall be via standard BACnet objects. Proprietary BACnet objects shall not be allowed. BACnet communications shall conform to the BACnet protocol (ANSI/ASHRAE135-2001). A BACnet Protocol Implementation Conformance Statement (PICS) shall be provided along with the unit submittal.

2.05 OPTIONS AND ACCESSORIES

A. The following options are to be included: 1. Low Ambient Control: Fan VFD allows unit operation from 32°F down to -

10°F (-23.3 C). 2. The following accessories, if selected, are to be included:

a. Rubber-in-shear vibration isolators for field installation b. Factory-mounted thermal dispersion type flow switch c. Field-mounted, paddle type, chilled water flow switch field wired to

the control panel d. Wye strainer, to be installed at the evaporator inlet and sized for

the design flow rate, with perforation diameter of 0.063" with blowdown valve and Victaulic couplings (factory mounted or field installed)

e. 115V GFI convenience outlet B. Optional Factory-Installed Pump Package: None

1. These pump package accessories, if selected, will also be included: a. Water pressure gauges on the pump suction and discharge b. Expansion tank with size increments from 4.4 to 90 gallons, field

installed (small sizes can be factory mounted c. Air separator with air vent, field installed d. Storage tanks, vertical, insulated, 150, 300, 600, 1000 gallon sizes

with optional immersion heater, field installed. PART 3 - EXECUTION 3.01 INSTALLATION

A. Antenna, or equivalent, if needed, shall be shipped loose from the factory, and shall be mounted and electrically-connected in the field by the contractor providing unit start-up and commissioning, per factory-supplied installation literature. For sites using Local Area Network (LAN) connection to provide cloud access, appropriate trades should coordinate to supply all necessary roof penetrations, conduit, network cable, network infrastructure, and termination to the network


B. Install in strict accordance with manufacturer’s requirements, shop drawings, and contract documents.

C. Adjust and level chiller in alignment on supports. D. Coordinate electrical installation with electrical contractor. E. Coordinate controls with control contractor. F. Install a field-supplied or optional manufacturer-supplied strainer in the chilled

water return line at the evaporator inlet that meets manufacturer perforation size specifications.

3.02 START-UP

A. Initial programming of cloud-communicating smart device and integrated power meter shall be performed at the factory. Commissioning technician will submit the startup and commission documentation through the User Interface.

B. Provide testing and starting of machine, and instruct the Owner in its proper

operation and maintenance.

END OF SECTION

MAHG Project # 17-12 23 73 13 - 1 Modular Central Station Air Handling Units

SECTION 23 73 13 – MODULAR CENTRAL STATION AIR HANDLING UNITS

PART 1 - GENERAL

1.01 SECTION INCLUDES

A. Indoor Air Handling Units.

1.02 REFERENCES

A. AFBMA 9 - Load Ratings and Fatigue Life for Ball Bearings. B. AMCA 99 - Standards Handbook. C. AMCA 210 - Laboratory Methods of Testing Fans for Rating Purposes. D. AMCA 300 - Test Code for Sound Rating Air Moving Devices. E. AMCA 500 - Test Methods for Louver, Dampers, and Shutters. F. AHRI 410 - Forced-Circulation Air-Cooling and Air-Heating Coils. G. AHRI 430 - Central-Station Air-Handling Units. H. AHRI 435 - Application of Central-Station Air-Handling Units. I. ASTMB117 - Standard Practice for Operating Salt Spray Apparatus. J. NEMA MG1 - Motors and Generators. K. NFPA 70 - National Electrical Code. L. SMACNA - HVAC Duct Construction Standards - Metal and Flexible. M. UL 723 - Test for Surface Burning Characteristics of Building Materials. N. UL 900 - Test Performance of Air Filter Units. O. UL 1995 - Standard for Heating and Cooling Equipment. P. UL 94 - Test for Flammability of Plastic Materials for Parts in Devices and

Appliances. Q. IBC 2000, 2003 - International Building Code. R. NFPA 90A - Standard for the Installation of Air Conditioning and Ventilating

Systems.


S. NFPA 5000 - Building Construction and Safety Code. T. ASHRAE 90.1 Energy Code. U. AHRI Standard 1060 - Rating Air-to-Air Heat Exchangers for Energy Recovery

Ventilation Equipment. V. GSA 2003 Facilities Standard - 5.9 HVAC Systems and Components.

1.03 SUBMITTALS

A. Shop Drawings: Indicate assembly, unit dimensions, weight loading, required clearances, construction details, field connection details, and electrical characteristics and connection requirements. Computer generated fan curves for each air handling unit shall be submitted with specific design operating point noted. A computer generated psychometric chart shall be submitted for each cooling coil with design points and final operating point clearly noted. Sound data for discharge, radiated and return positions shall be submitted by octave band for each unit. Calculations for required base rail heights to satisfy condensate trapping requirements of cooling coil shall be included.

B. Product Data:

1. Provide literature that indicates dimensions, weights, capacities, ratings, fan performance, finishes of materials, electrical characteristics, and connection requirements.

2. Provide data of filter media, filter performance data, filter assembly, and filter frames.

3. Provide manufacturer's installation instructions. 1.04 QUALIFICATIONS

A. Manufacturer: Company specializing in manufacturing Air Handler products specified in this section must show a minimum five years documented experience and complete catalog data on total product.

1.05 SAFETY AGENCY LISTED & CERTIFICATION

A. Air Handling units shall be cETLus safety listed to conform with UL Standard 1995 and CAN/CSA Standard C22.2 No. 236. Units shall be accepted for use in New York City by the Department of Building, MEA 342-99-E.

B. Air handler furnished with double width, double inlet (DWDI) fans and/or plenum

fans where applicable, shall be certified in accordance with the central station air handling units certification program, which is based on AHRI Standard 430. (NOTE: Above does not apply to fan array)

C. Air handling unit water heating & cooling coils shall be certified in accordance

with the forced circulation air cooling and air heating coils certification program, which is based on AHRI Standard 410.


1.06 WARRANTY

A. The equipment manufacturer shall provide, at no additional cost, a standard parts warranty that covers a period of one year from unit start-up or 18 months from shipment, whichever occurs first. This warrants that all products are free from defects in material and workmanship and shall meet the capacities and ratings set forth in the equipment manufacturer's catalog and bulletins.

1.07 DELIVERY, STORAGE, AND HANDLING

A. Deliver, store, protect and handle products to site. B. Accept products on site on factory-furnished shipping skids. Inspect for damage. C. Store in clean dry place and protect from construction traffic. Handle carefully to

avoid damage to components, enclosures, and finish. PART 2 - PRODUCTS 2.01 ACCEPTABLE MANUFACTURERS

A. The following manufacturers are approved for use. No substitutions will be permitted. 1. Daikin Applied 'Vision' Air Handler shall be the basis of design. 2. (Approved Equal)

2.02 GENERAL DESCRIPTION

A. Configuration: Fabricate as detailed on drawings. B. Performance: Conform to AHRI 430. See schedules on prints. (NOTE: above

does not apply to fan array) C. Acoustics: Sound power levels (dB) for the unit shall not exceed the specified

levels shown on the unit schedule. The manufacturer shall provide the necessary sound treatment to meet these levels if required.

2.03 UNIT CONSTRUCTION

A. Fabricate unit with heavy gauge channel posts and panels secured with mechanical fasteners. All panels, access doors, and ship sections shall be sealed with permanently applied bulb-type gasket. Shipped loose gasketing is not allowed.

B. Panels and access doors shall be constructed as a 2-inch nominal thick; thermal

broke double wall assembly, injected with foam insulation with an R-value of not less than R-13. 1. The inner liner shall be constructed of G90 galvanized steel. 2. The outer panel shall be constructed of G90 galvanized steel.


3. The floor plate shall be constructed as specified for the inner liner. 4. Unit will be furnished with solid inner liners.

C. Panel deflection shall not exceed L/240 ratio at 125% of design static pressure,

maximum 5 inches of positive or 6 inches of negative static pressure. Deflection shall be measured at the panel midpoint.

D. The casing leakage rate shall not exceed 0.50 cfm per square foot of casing surface area at design static pressure up to a maximum of +5” w.c. in positive pressure sections and -6” w.c. in negative pressure sections (.0025 m3/s per square meter of cabinet area at 1.24 kPa static pressure)

E. Module to module field assembly shall be accomplished with an overlapping, full

perimeter internal splice joint that is sealed with bulb type gasketing on both mating modules to minimize on-site labor and meet indoor air quality standards.

F. Access doors shall be flush mounted to cabinetry, with minimum of two six inch

long stainless steel piano-type hinges, latch and full size handle assembly. Access doors shall swing outward for unit sections under negative pressure. Access doors on positive pressure sections, shall have a secondary latch to relieve pressure and prevent injury upon access.

G. A 4-inch formed G60 galvanized steel base rail shall be provided by the unit

manufacturer for structural rigidity and condensate trapping.. The base rail shall be constructed with 12-gauge nominal for unit sizes 003 - 035 and 10-gauge nominal for unit sizes 040 - 090. The following calculation shall determine the required height of the baserail to allow for adequate drainage. Use the largest pressure to determine base rail height. [(Negative)(Positive) static pressure (in)] (2) + 4” = required baserail height. Should the unit baserail not be factory supplied at this height, the contractor is required to supply a concrete housekeeping pad to make up the difference.

H. Construct drain pans from stainless steel with cross break and double sloping

pitch to drain connection. Provide drain pans under cooling coil section. Drain connection centerline shall be a minimum of 3’’ above the base rail to aid in proper condensate trapping. Drain connections that protrude from the base rail are not acceptable. There must be a full 2’’ thickness of insulation under drain pan.

2.04 FAN ASSEMBLIES

A. Acceptable fan assembly shall be a single width, single inlet, class II, direct-drive type plenum fan dynamically balanced as an assembly, as shown in schedule. Maximum fan RPM shall be below first critical fan speed. Fan assemblies shall be dynamically balanced by the manufacturer on all three planes. Provide access to motor and fan assembly through hinged access door.

B. Fan and motor shall be mounted internally on a steel base. Factory mount motor

on slide base that can be slid out the side of the unit if removal is required. Provide access to motor, drive, and bearings through hinged access door. Fan


and motor assembly shall be mounted on 2" deflection spring vibration type isolators inside cabinetry.

2.05 BEARINGS, SHAFTS, AND DRIVES

A. Bearings: Basic load rating computed in accordance with AFBMA - ANSI Standards. The bearings shall be provided on the motor with the fan wheel mounted directly on the motor shaft, AMCA arrangement 4.

B. Shafts shall be solid, hot rolled steel, ground and polished, keyed to shaft, and

protectively coated with lubricating oil. Hollow shafts are not acceptable. C. The fan wheel shall be direct coupled to the motor shaft. The wheel width shall

be determined by motor speed and fan performance characteristics. 2.06 ELECTRICAL

A. Fan motors shall be manufacturer provided and installed, Open Drip Proof, premium efficiency (meets or exceeds EPAct requirements), 3500 RPM, single speed, 200V / 60HZ / 3P. Complete electrical characteristics for each fan motor shall be as shown in schedule.

B. The air handler(s) shall be ETL and ETL-Canada listed by Intertek Testing

Services, Inc. Units shall conform to bi-national standard ANSI/UL Standard 1995/CSA Standard C22.2 No. 236.

C. Wiring Termination: Provide terminal lugs to match branch circuit conductor

quantities, sizes, and materials indicated. Enclosed terminal lugs in terminal box sized to NFPA 70.

D. Manufacturer shall provide ASHRAE 90.1 Energy Efficiency equation details for

individual equipment to assist Building Engineer for calculating system compliance.

E. Installing contractor shall provide GFI receptacle within 25 feet of unit to satisfy

National Electrical Code requirements. F. Air handler manufacturer shall provide, mount and wire ABB variable speed drive

with electrical characteristics such as indicated on project schedule and shown on manufacturer's data sheets.

2.07 COOLING AND HEATING COILS

A. Certification: Acceptable water cooling, water heating, steam, and refrigerant coils shall be certified in accordance with AHRI Standard 410 and bear the AHRI label. Coils exceeding the scope of the manufacturer’s certification and/or the range of AHRI’s standard rating conditions will be considered provided the manufacturer is a current member of the AHRI Forced Circulation Air-Cooling and Air-Heating Coils certification programs and that the coils have been rated in accordance with AHRI Standard 410. Manufacturer must be ISO 9002 certified.


B. Water cooling coil shall be provided. Provide access to coil(s) for service and cleaning. Enclose coil headers and return bends fully within unit casing. Unit shall be provided with coil connections that extend a minimum of 5” beyond unit casing for ease of installation. Drain and vent connections shall be provided exterior to unit casing. Coil connections must be factory sealed with grommets on interior and exterior panel liners to minimize air leakage and condensation inside panel assembly. If not factory packaged, Contractor must supply all coil connection grommets and sleeves. Coils shall be removable through side and/or top panels of unit without the need to remove and disassemble the entire section from the unit. 1. Headers shall consist of seamless copper tubing to assure compatibility

with primary surface. Headers to have intruded tube holes to provide maximum brazing surface for tube to header joint, strength, and inherent flexibility. Header diameter should vary with fluid flow requirements.

2. Fins shall have a minimum thickness of 0.0075 inch aluminum plate construction. Fins shall have full drawn collars to provide a continuous surface cover over the entire tube for maximum heat transfer. Tubes shall be mechanically expanded into the fins to provide a continuous primary to secondary compression bond over the entire finned length for maximum heat transfer rates. Bare copper tubes shall not be visible between fins.

3. Coil tubes shall be 5/8 inch OD seamless copper, 0.020 inch nominal tube wall thickness, expanded into fins, brazed at joints.

4. Coil connections shall be carbon steel, NPT threaded connection. Connection size to be determined by manufacturer based upon the most efficient coil circuiting. Vent and drain fittings shall be furnished on the connections, exterior to the air handler. Vent connections provided at the highest point to assure proper venting. Drain connections shall be provided at the lowest point to insure complete drainage and prevent freeze-up.

5. Coil casing shall be a formed channel frame of galvanized steel. C. Water heating coil shall be provided. Provide access to coil(s) for service and

cleaning. Enclose coil headers and return bends fully within unit casing. Unit shall be provided with coil connections that extend a minimum of 5” beyond unit casing for ease of installation. Drain and vent connections shall be provided exterior to unit casing. Coil connections must be factory sealed with grommets on interior and exterior panel liners to minimize air leakage and condensation inside panel assembly. If not factory packaged, Contractor must supply all coil connection grommets and sleeves. Coils shall be removable through side and/or top panels of unit without the need to remove and disassemble the entire section from the unit. 1. Headers shall consist of seamless copper tubing to assure compatibility

with primary surface. Headers to have intruded tube holes to provide maximum brazing surface for tube to header joint, strength, and inherent flexibility. Header diameter should vary with fluid flow requirements.

2. Fins shall have a minimum thickness of 0.0075 inch aluminum plate construction. Fins shall have full drawn collars to provide a continuous surface cover over the entire tube for maximum heat transfer. Tubes shall be mechanically expanded into the fins to provide a continuous primary to secondary compression bond over the entire finned length for


maximum heat transfer rates. Bare copper tubes shall not be visible between fins.

3. Coil tubes shall be 5/8 inch OD seamless copper, 0.020 inch nominal tube wall thickness, expanded into fins, brazed at joints.

4. Coil connections shall be carbon steel, threaded connection. Connection size to be determined by manufacturer based upon the most efficient coil circuiting. Vent and drain fittings shall be furnished on the connections, exterior to the air handler. Vent connections provided at the highest point to assure proper venting. Drain connections shall be provided at the lowest point to insure complete drainage and prevent freeze-up.

5. Coil shall be furnished as an uncased galvanized steel track to allow for thermal movement and slide into a pitched track for fluid drainage.

D. Horizontal tube integral face and bypass hot water coil shall be furnished and

consist of multiple alternating heating sections and bypass sections, with airflow distributed to each by interlocking wrap-a-round “clamshell” style dampers; linkage to be stainless steel. Coils shall be suitable for continuous operation at 200 psig and 400 F degrees. Heating elements to consist of multi-row, multi-pass extended heat transfer surface; coil shall carry ARI 410 certification as to ratings. Welding and brazing shall be done by ASME qualified personnel. 1. Headers shall be single piece carbon steel, with no separate disks or

caps welded or brazed into header ends. Connections shall be steel and shall be welded to header barrels.

2. Fins shall be continuous patterned plate, .0075” thick aluminum with full fin collars.

3. Tubes shall be 5/8” diameter seamless copper, .035” average wall thickness. Joints shall be silver brazed.

4. Casings and dampers shall be minimum 16 gauge mill galvanized steel; top and bottom casing panels to be double flanged for stacking. End casings shall have smooth, embossed tube holes to provide adequate bearing surface for tubes to avoid abrasion during expansion and contraction. Flexible connectors shall not be required.

2.08 FILTERS

A. Furnish flat panel filter section with 2-inch pleated MERV 8 filter. Provide side loading and removal of filters.

B. Filter media shall be UL 900 listed, Class I or Class II. C. Filter Magnehelic gauge(s) shall be furnished and mounted by equipment

manufacturer. 2.09 ADDITIONAL SECTIONS

A. Plenum section shall be provided and properly sized for inlet and/or discharge air flow (between 600 and 1500 feet per minute). The plenum shall provide single or multiple openings as shown on drawings and project schedule.

B. Access section shall be provided for access between components.


PART 3 - EXECUTION 3.01 INSTALLATION

A. Install in accordance with manufacturer’s Installation & Maintenance instructions. 3.02 ENVIRONMENTAL REQUIREMENTS

A. Do not operate units for any purpose, temporary or permanent, until ductwork is clean, filters are in place, bearings lubricated, and fan has been test run under observation.

3.03 EXTRA MATERIALS

A. Provide one extra set of fan belts and filters for each unit as shown on project schedule.

END OF SECTION

MAHG Project # 17-12 23 82 19 - 1 Fan Coil Units

SECTION 23 82 19 – FAN COIL UNITS PART 1 - GENERAL 1.01 SECTION INCLUDES

A. Horizontal Fan Coil 1.02 REFERENCES

A. Load Ratings and Fatigue Life for Ball Bearings. B. Standards Handbook. C. Laboratory Methods of Testing Fans for Rating Purposes. D. Test Code for Sound Rating Air Moving Devices. E. Test Methods for Louver, Dampers, and Shutters. F. Room Fan Coil Unit. G. Standard Practice for Operating Salt Spray Apparatus. H. Motors and Generators. I. National Electrical Code. J. HVAC Duct Construction Standards - Metal and Flexible K. Test for Surface Burning Characteristics of Building Materials. L. Test Performance of Air Filter Units. M. Standard for Heating and Cooling Equipment. N. Test for Flammability of Plastic Materials for Parts in Devices and Appliances.

1.03 SUBMITTALS

A. Shop Drawings: Indicate assembly, unit dimensions, weight loading, required clearances, construction details, field connection details, and electrical characteristics and connection requirements.

B. Product Data

1. Provide literature that indicates dimensions, weights, capacities, ratings, fan performance, gauges and finishes of materials, and electrical characteristics and connection requirements.


1.04 OPERATION AND MAINTENANCE DATA

A. Maintenance Data: Include instructions for lubrication and filter replacement. 1.05 QUALIFICATIONS

A. Manufacturer: Company specializing in manufacturing Air Handler products specified in this section must show a minimum five years documented experience and complete catalog data on total product.

1.06 DELIVERY, STORAGE, AND HANDLING

A. Deliver, store, protect and handle products to site. B. Accept products on site wrapped in protective cardboard wrap. Inspect for

damage. C. Store in a clean dry place and protect from weather and construction traffic.

Handle carefully to avoid damage. 1.07 ENVIORMENTAL REQUIREMENTS

A. Do not operate units for any purpose, temporary or permanent, until ductwork is clean, filters are in place, bearings lubricated, and fan has been test run under observation.

PART 2 - PRODUCTS 2.01 ACCEPTABLE MANUFACTURERS

A. The following manufacturers are approved for use. No substitutions. 1. Daikin Applied - 'ThinLine 3G' Fan Coil is the basis of design, including

standard product features and all special features required per plans and specifications.

2. ETI 3. Greenheck

2.02 FAN COIL TYPE AND ARRANGEMENT

A. The fan coil shall be furnished as a draw-through cooling coil with a heating coil in preheat/reheat position.

2.03 GENERAL CONSTRUCTION

A. The units shall include a chassis, coil(s), fan deck with blower(s)/blower housing and motor(s). Steel parts exposed to moisture shall be galvanized and insulated to prevent condensation. The complete fan assembly shall be easily removable for service and maintenance. A quick-connect motor electric plug shall be provided.


B. Hideaway 1. Unit shall be supplied with return plenum complete with filter frame and

filter. The plenum shall be fabricated of 18 gauge galvanized steel. The inside plenum surface shall be insulated with 1/2" matt-faced fibergalss insulation. Plenum insulation shall meet minimum K value of 0.24 (BTU-in)/(hr-ft2-F) and rated for maximum air velocity of 5000 fpm. Fiberglass insulation conforms to: a. ASTM C1071 (including C665) b. UL 181 for erosion c. 25/50 rating for flame spread/smoke developed per ASTM E-84,

UL 723 and NFPA 90A 2.04 SUPPLY FAN

A. Supply fans shall be a DWDI forward-curved type. Fan assemblies including fan, motor and sheaves shall be dynamically balanced by the manufacturer on all three planes at all bearing supports. Manufacturer must ensure maximum fan RPM is below the first critical speed.

B. The complete fan assembly, including motor and main drain pan shall be easily

removable. C. Units shall be certified in accordance with the Room Fan Coil Unit certification

program that is based on ARI Standard 440. D. An ECM blower motor shall be provided on all units. Factory motor wiring shall

be set for optimum fan performance. The unit shall be shipped at one fixed setting. The ECM motor shall utilize a permanent magnet rotor, which is connected to the shaft through resilient rings to absorb high frequency torque ripple. ECM motor shall be programmed for constant CFM or constant torque.

E. ECM blower motor shall be 3 speeds, single phase with means for proportional

field adjustment of each speed. 2.05 ELECTRICAL

A. Supply fans shall be driven by permanent split-capacitor motors that are run-tested in the assembled unit and permanently lubricated. All motors shall have integral thermal overload protection with a maximum ambient operating temperature of 104°F. Motors shall be capable of starting at 78 percent of rated voltage and operating at 90 percent of rated voltage on all speed settings. Motors can operate up to 10 percent overvoltage.

B. Motor wires shall include a quick-disconnect motor plug.

2.06 COOLING AND HEATING

A. Cooling Coils 1. Cooling performance shall be as specified on the unit schedule. 2. Water coil fins shall have full drawn collars to provide a continuous

surface cover over the entire tube for maximum heat transfer. Seamless


copper tubes shall be mechanically expanded into the fins to provide a continuous primary-to-secondary compression bond over the entire finned length for maximum heat transfer rates. Bare copper tubes shall not be visible between fins. Coil casing shall be constructed of galvanized steel.

3. Water coils shall be provided with headers of seamless copper tubing with intruded tube holes to permit expansion and contraction without creating undue stress or strain. Coil connections shall be copper sweat connections with connection size to be determined by manufacturer based upon the most efficient coil circuiting. Vent and drain connections shall be furnished on the coil connection, external to the cabinet. Vent connections provided at the highest point to assure proper venting. Drain connections shall be provided at the lowest point.

4. All steel parts exposed to moisture shall be galvanized. 5. Unit shall include a noncorrosive, ABS main drain pan, positively sloped

in every plane and insulated with closed-cell insulation. The drain pan shall be designed to ensure no pooling of condensate water per ASHRAE 62.2.

B. Water/Steam Heating Coil

1. Heating performance shall be as specified on the unit schedule. 2. Coil fins shall have full drawn collars to provide a continuous surface

cover over the entire tube for maximum heat transfer. Seamless copper tubes shall be mechanically expanded into the fins to provide a continuous primary-to-secondary compression bond over the entire finned length for maximum heat transfer rates. Bare copper tubes shall not be visible between fins.

3. Coils shall be provided with headers of seamless copper tubing with intruded tube holes to permit expansion and contraction without creating undue stress or strain. Coil connections shall be copper sweat connections with connection size to be determined by manufacturer based upon the most efficient coil circuiting. Vent and drain connections shall be furnished on the coil connection, external to the cabinet. Vent connections shall be provided at the highest point to ensure proper venting. Drain connections shall be provided at the lowest point.

2.07 VALVE PACKAGES

A. Fan coil units shall be provided with factory-installed valve / piping package(s)available for the primary and secondary coils. All piping packages shall be factory assembled and tested at 400 psig (2760 kPa) and re-tested for leak when factory soldered to the coil(s) at 300 psig (2069 kPa) Maximum Working Pressure of the piping package shall be 300 psig (2069 kPa).

B. The valve package shall be designed so that any condensation is directed into

the secondary drain pan. With the secondary drain pan provided, insulation of the piping package is not required.

C. The valve package shall be provided with:

1. Interconnecting copper piping and shut-off ball valves. 2. Connecting supply and return lines to the unit. Four-pipe packages shall

include a venting valve for the preheat or reheat coil.


3. A manual circuit setter in the supply water pipe. The circuit setter acts as both a flow-setting device and a shut-off valve. It allows water flow through the fan coil to be set quickly and accurately. The valve shall have a memory stop so that the correct setting can be found quickly.

4. An automatic circuit setter. The circuit setter includes a cartridge within the valve body that is sized to allow a specific flow rate through the coil. This valve sets flow through the coil without any action required by a system piping balancer.

5. P/T ports to measure the temperature or pressure drop across the valve. This pressure drop can be compared to factory-supplied curves that relate the pressure drop to a specific flow rate.

6. Unions at the coil connections. 7. A 20 mesh strainer on the supply side that is easily removed for cleaning,

with a blow-off valve. The strainer shall have a pressure rating of up to 400 psig (2,758 kPa).

8. Isolating ball valve on the supply side. 9. Balancing flow valve (auto-fixed or manual) with isolating ball valve on the

return. 10. Control valves in the supply water pipe. 11. Two-Way Modulating Valves that modulate the water flow through the coil

in response to a signal from the Daikin Applied thermostat or controller. All standard Daikin Applied modulating valves are three-wire floating point equal percentage valves. The modulating valves are factory mounted in the supply water pipe upstream of the coil.

2.08 FILTERS

A. Filters shall be 1” (25 mm) throwaway. They shall be concealed from sight and easily removable.

2.09 CONTROLS

A. Unit shall be supplied with a DDC interface board. B. DDC Interface board shall have three 24-volt relays with line-voltage contactors

to operate the fan motor speeds. C. DDC interface board shall have terminal connections for interfacing to:

1. Wall-Mounted Thermostat 2. Low-voltage, on-off valve actuators. 3. A return air sensor. 4. A pipe temperature sensor for changeover from heating to cooling on two-

pipe systems. 5. Condensate overflow switch. 6. Room occupancy sensor.


PART 3 - EXECUTION 3.01 INSTALLATION

A. The Thinline Fan Coil unit shall be installed per manufacturer's Installation & Maintenance Bulletin. 1. Selected field mounted kits shall be specified on the unit schedule and

installed per manufacturer's instruction.

END OF SECTION

Documents

Project Manual - Arkansas Tech University ATU HVAC - MECHANIC… · E. Acoustics: Sound pressure levels for the unit shall not exceed the following specified levels. All manufacturers