237400ADD1.pdf

OANG 180th Fighter Wing - Swanton, Ohio URS

WYTD 079032 - Construct ACA Alert Crew Quarters Facility URS Project No. 14578137

23 January 2015 Type B Services – B2 95% Submittal

PACKAGE ROOFTOP UNIT (RTU) 23 7400 - Page 1 of 14

SECTION 23 7400

PACKAGE ROOFTOP UNIT (RTU)

PART 1 - GENERAL

1.1 SUMMARY

A. Section Includes:

1. Variable-air-volume, rooftop units.

1.2 REFERENCES

A. Applicable Standards (Latest Edition):

1. Air-Conditioning and Refrigeration Institute (ARI):

a. 410 - Forced-Circulation Air-Cooling and Air-Heating Coils.

b. 430 - Central-Station Air-Handling Units.

2. Air Movement and Control Association International, Inc. (AMCA):

a. 210 - Laboratory Methods of Testing Fans for Aerodynamic Performance Rating

(ANSI).

b. 300 - Reverberant Room Method for Sound Testing of Fans.

c. 301 - Methods for Calculating Fan Sound Ratings from Laboratory Test Data.

d. 500-D - Laboratory Methods for Testing Dampers for Rating.

3. American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE):

a. 33 - Methods of Testing Forced Circulation Air Cooling and Air Heating Coils.

b. 52.2 - Method of Testing General Ventilation Air-Cleaning Devices for Removal

Efficiency by Particles Size (ANSI).

c. 62.1 - Ventilation for Acceptable Indoor Air Quality (ANSI)

4. ASTM International (ASTM):

a. B88 - Seamless Copper Water Tube.

b. B88M - Seamless Copper Water Tube (Metric).

5. National Electrical Manufacturers Association (NEMA):

a. ICS 2 - Industrial Control and Systems: Controllers, Contractors, and Overload

Relays, Rated not more than 2000 Volts AC or 750 Volts DC.

b. MG 1 - Motors and Generators.

6. National Fire Protection Association (NFPA):

a. 70 - National Electrical Code.

b. 90A - Installation of Air Conditioning and Ventilating Systems.

7. Sheet Metal and air Conditioning Contractor's National Association (SMACNA).

a. HVAC Duct Construction Standards.

8. Structural Engineering Institute/American Society of Civil Engineers (SEI/ASCE):

a. 7 - Minimum Design Loads for Buildings and Other Structures.

1.3 PERFORMANCE REQUIREMENTS

A. Structural Performance: Casing panels shall be self-supporting and capable of withstanding

133% of internal static pressures indicated, without panel joints exceeding a deflection of L/200 where "L" is the unsupported span length within completed casings.

PACKAGE ROOFTOP UNIT (RTU) 23 7400 - Page 2 of 14

B. Seismic Performance: Air-handling units shall withstand the effects of earthquake motions determined according to ASCE/SEI 7.

1. The term "withstand" means "the unit will remain in place without separation of any parts from the device when subjected to the seismic forces specified and the unit will be fully operational after the seismic event."

1.4 SUBMITTALS

A. General: Submit each item in this Article in accordance with SECTION 230500 – COMMON

WORK RESULTS FOR HVAC.

B. Product Data: For each air-handling unit indicated.

1. Unit dimensions and weight.

2. Cabinet material, metal thickness, finishes, insulation, and accessories.

3. Fans:

a. Certified fan-performance curves with system operating conditions indicated.

b. Certified fan-sound power ratings.

c. Fan construction and accessories.

d. Motor ratings, electrical characteristics, and motor accessories.

4. Certified coil-performance ratings with system operating conditions indicated.

5. Dampers, including housings, linkages, and operators.

6. Filters with performance characteristics.

C. Delegated-Design Submittal: For vibration isolation and seismic restraints indicated to comply with performance requirements and design criteria, including analysis data signed and sealed by the qualified professional engineer responsible for their preparation.

1. Vibration Isolation Base Details: Detail fabrication including anchorages and attachments to structure and to supported equipment. Include adjustable motor bases, rails, and frames for equipment mounting.

2. Design Calculations: Calculate requirements for selecting vibration isolators and seismic restraints and for designing vibration isolation bases.

D. Seismic Qualification Certificates: For rooftop units, accessories, and components, from manufacturer.

1. Basis for Certification: Indicate whether withstand certification is based on actual test of assembled components or on calculation.

2. Dimensioned Outline Drawings of Equipment Unit: Identify center of gravity and locate and describe mounting and anchorage provisions.

3. Detailed description of equipment anchorage devices on which the certification is based and their installation requirements.

E. Source quality-control reports.

F. Field quality-control reports.

G. Operation and Maintenance Data: For air-handling units to include in emergency, operation, and maintenance manuals.

H. LEED Submittal:

1. Product Data for Prerequisite EQ1: Documentation indicating that units comply with

ASHRAE 62.1-2004, Section 5 - "Systems and Equipment."

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1.5 QUALITY ASSURANCE

A. Electrical Components, Devices, and Accessories: Listed and labeled as defined in NFPA 70, by a qualified testing agency, and marked for intended location and application.

B. NFPA Compliance: Comply with NFPA 90A for design, fabrication, and installation of air-handling units and components.

C. ARI Certification: Air-handling units and their components shall be factory tested according to

ARI 430, and shall be listed and labeled by ARI.

D. ASHRAE Compliance: Applicable requirements in ASHRAE 62.1, Section 5 - "Systems and

Equipment" and Section 7 - "Construction and Startup."

E. ASHRAE/IESNA 90.1 Compliance: Applicable requirements in ASHRAE/IESNA 90.1, Section 6 - "Heating, Ventilating, and Air-Conditioning."

F. Comply with NFPA 70.

G. Manufacturer: Company specializing in manufacturing the Products specified in this section with minimum five years’ experience, who issues complete catalog data on total product.

H. Startup must be done by trained personal that are experienced with rooftop equipment.

I. Do not operate units for any purpose, temporary or permanent, until ductwork is clean, filters and remote controls are in place, bearings lubricated, and manufacturers installations have been followed.

1.6 COORDINATION

A. Coordinate sizes and locations of concrete bases with actual equipment provided.

1.7 EXTRA MATERIALS

A. Furnish extra materials that match products installed and that are packaged with protective covering for storage and identified with labels describing contents.

1. Filters: One set for each type.

2. Fan Belts: One set for each air-handling unit fan.

PART 2 - PRODUCTS

2.1 MANUFACTURERS

A. Manufacturers: Subject to compliance with requirements, provide products by one of the following:

1. Aaon.

2. Daikin

3. Engineered Air.

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2.2 GENERAL DESCRIPTION

A. Furnish as shown on plans, Single zone heating and cooling units. Unit performance and electrical characteristics shall be per the job schedule.

B. Configuration: Fabricate as detailed on the drawings.

C. The complete unit shall be ETL/UL listed.

D. Each unit shall be specifically designed for outdoor rooftop application and include a weatherproof cabinet. Units shall be of a modular design with factory installed access sections available to provide maximum design flexibility. Unit shall be completely factory assembled and shipped in one piece. Units shall be shipped fully charged with R410A.

E. The unit shall undergo a complete factory run test prior to shipment. The factory test shall include final balancing of all fan assemblies; refrigeration circuit run test, unit control system operations checkout, unit refrigerant leak test and a final unit inspection.

F. Factory test shall include test and adjustment of the gas furnace.

G. All units shall have decals and tags to indicate caution areas and aid unit service. Unit nameplates shall be fixed to the main control panel door. Electrical wiring diagrams shall be attached to the control panels. Installation, operating and maintenance bulletins and start-up forms shall be supplied with each unit.

H. Performance: All scheduled capacities and face areas are the minimum accepted value. All scheduled amps, KW, and HP are maximum accepted values that allow scheduled capacity to be met.

2.3 CABINET, CASING, AND FRAME

A. All cabinet walls, access doors, and roof shall be fabricated of double wall, impact resistant, rigid polyurethane foam panels.

B. Unit insulation shall have a minimum thermal resistance R-value of 13. Foam insulation shall have a minimum density of 2 pounds/cubic foot and shall be tested in accordance with ASTM

D-1929 for a minimum flash ignition temperature of 610°F.

C. Unit construction shall be double wall with G90 galvanized steel on both sides and a thermal break. Double wall construction with a thermal break prevents moisture accumulation on the insulation, provides a cleanable interior, prevents heat transfer through the panel, and prevents exterior condensation on the panel.

D. Unit shall be designed to reduce air leakage and infiltration through the cabinet. Cabinet leakage shall not exceed 1% of total airflow when tested at 3 times the minimum external static pressure provided in AHRI Standard 340/360. Panel deflection shall not exceed L/240 ratio at 125% of design static pressure, at a maximum 8 inches of positive or negative static pressure, to reduce air leakage. Deflection shall be measured at the midpoint of the panel height and width.

Continuous sealing shall be included between panels and between access doors and openings to reduce air leakage. Piping and electrical conduit through cabinet panels shall include sealing to reduce air leakage.

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E. Roof of the air tunnel shall be sloped to provide complete drainage. Cabinet shall have rain break overhangs above access doors.

F. Access to filters, dampers, cooling coils, reheat coil, heaters, exhaust fans, return fans, compressors, and electrical and controls components shall be through hinged access doors with quarter turn, zinc cast, lockable handles. Full length stainless steel piano hinges shall be included on the doors.

G. Exterior paint finish shall be capable of withstanding at least 2,500 hours, with no visible corrosive effects, when tested in a salt spray and fog atmosphere in accordance with ASTM B

117-95 test procedure.

H. Units with cooling coils shall include double sloped 304 stainless steel drain pans.

I. Unit shall be provided with base discharge and return air openings. All openings through the base pan of the unit shall have upturned flanges of at least 1/2 inch in height around the opening.

J. Unit shall include lifting lugs on the top of the unit.

K. Unit base shall be fabricated of 1 inch thick double wall, impact resistant, rigid polyurethane foam panels.

2.4 SUPPLY AND POWER EXHAUST FANS

A. All fan assemblies shall be statically and dynamically balanced at the factory, including a final trim balance, prior to shipment. All fan assemblies shall employ solid steel fan shafts. Heavy-duty pillow block type, self-aligning, grease lubricated ball bearings shall be used. Bearings shall be sized to provide an L-50 life at 200,000 hours. The entire fan assembly shall be isolated from the fan bulkhead and mounted on rubber-in-shear isolators. Fixed pitch V-belt drives with matching belts shall be provided. V-belt drives shall be selected at the manufacturer's standard service factor.

B. Fan motors shall be heavy-duty 1800 rpm open drip-proof (ODP), premium efficiency. Fan motors to have greased lubricated ball bearings. Motors shall be mounted on an adjustable base that provides for proper alignment and belt tension adjustment.

C. Supply Fan:

1. Unit shall include direct drive, unhoused, backward curved, plenum supply fans.

2. Blowers and motors shall be dynamically balanced and mounted on rubber isolators.

3. Motors shall be standard (premium) efficiency TEFC with ball bearings rated for 200,000 hours service with external lubrication points.

4. Variable frequency drives shall be factory wired and mounted in the unit. Fan motors shall be premium efficiency.

D. Power Exhaust Fan: Power exhaust fans shall be belt-driven backward curved, plenum type with premium efficiency TEFC motor. Provide with a factory mounted and wired VFD.

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2.5 DX COOLING SECTIONS

A. Coils shall be designed for use with R-410A refrigerant and constructed of copper tubes with aluminum fins mechanically bonded to the tubes and galvanized steel end casings. Fin design shall be sine wave rippled.

B. Coils shall be helium leak tested and furnished with a factory installed thermostatic expansion

C. A stainless steel, positively sloped drain pan shall be provided with the cooling coil. The drain pan shall extend beyond the leaving side of the coil and underneath the cooling coil connections.

2.6 GAS HEATING SECTION

A. Stainless steel heat exchanger furnace shall carry a 25 year non-prorated warranty.

B. Gas furnace shall consist of aluminized (stainless) steel heat exchangers with multiple concavities, an induced draft blower and an electronic pressure switch to lockout the gas valve until the combustion chamber is purged and combustion airflow is established.

C. Furnace shall include a gas ignition system consisting of an electronic igniter to a pilot system, which will be continuous when the heater is operating, but will shut off the pilot when heating is not required.

D. Unit shall include a single gas connection and have gas supply piping entrances in the unit base for through-the-curb gas piping and in the outside cabinet wall for across the roof gas piping.

E. Natural gas furnace shall be equipped with modulating gas valves, adjustable speed combustion blowers, stainless steel tubular heat exchangers, and electronic controller. Combustion blowers and gas valves shall be capable of modulation. Electronic controller includes a factory wired, field installed supply air temperature sensor. Sensor shall be field installed in the supply air ductwork. Supply air temperature set point shall be adjustable on the electronic controller within the controls compartment. The gas heating assemblies shall be capable of operating at any firing rate between 100% and 30% of their rated capacity.

2.7 FILTERS

A. Filter sections shall be supplied as a complete integral component of the unit construction and arranged in heavy gauge galvanized steel racks. Filters shall be easily accessible through hinged doors. All filters will be supplied by the unit manufacturer for installation by the Heating

Contractor.

B. Pre-filters shall be 2-inch pleated throw-away type when indicated on the Contract

Documents. Filter shall be MERV-A 13 on ASHRAE test standard 52.1-92, with an average air resistance of 90-95%. Filter service pulls shall be provided.

C. Final filters shall be 4-inch carbon filters type. Filter service pulls shall be provided.

1. The Purafilter Commercial Grade air filters, as manufactured by Purafil, Inc., shall be high performance, 4" deep pleated, rigid, disposable, gas-phase (chemical) filters supplied with or without an integral particulate filter.

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2. Purafilter medium shall be an adsorbent-loaded non-woven medium containing a combination (50:50) of Purafil Sodium Permanganate granular media and Purakol activated carbon granular media.

3. This media combination shall not only remove gaseous contaminants by physical adsorption, but also utilizes chemisorption to react with contaminants in the airstream. Thus, it is not to be replaced with a filter whose gas-phase medium is activated carbon.

4. These adsorbent-loaded non-woven media may be combined with an integral particulate filter media having a Minimum Efficiency Reporting Value (MERV) of 8 or better in the pleated filter form.

5. The filter frame shall be constructed of a rigid, heavy-duty, high wet strength, die-cut beverage board with diagonal support members bonded to the air entering and air exiting side of each pleat to ensure pleat stability.

a. 4" deep filters shall be equipped with individual die cut or prefabricated contour stabilizers (fingers) or other approved devices to ensure uniform separate and parallel pleats and to stabilize each pleat.

6. The frame shall consist of two mated pieces that form a double wall around the entire perimeter of the filter.

a. The inside periphery of the enclosing frame shall be bonded to the pleat pack to eliminate the possibility of air bypass.

b. Adhesive shall be applied uniformly with not apparent gaps to all inside surfaces of the enclosing frame to ensure bonding with the pleat pack and with all mated surfaces of the frame.

7. All materials of construction - especially adhesives - shall be of low- or non-emitting materials so as not to adversely affect the media.

D. Unit shall include factory installed Magnehelic gauge measuring the pressure drop across the filter rack.

E. Provide one (1) spare set of filters for each type.

2.8 OUTDOOR/RETURN AIR SECTION

A. Unit shall include 0-100% economizer consisting of a motor operated outside air damper and return air damper assembly constructed of extruded aluminum, hollow core, airfoil blades with rubber edge seals and aluminum end seals. Damper blades shall be gear driven and designed to have no more than 15 CFM of leakage per sq. ft. of damper area when subjected to 2 inches w.g. air pressure differential across the damper. Damper assembly shall be controlled by spring return enthalpy activated fully modulating actuator. Unit shall include outside air opening bird screen, outside air hood with rain lip and barometric relief dampers.

B. Economizer shall be furnished with return air CO2 override as required.

2.9 ENERGY RECOVERY WHEEL

A. Unit shall contain a factory mounted and tested energy recovery wheel. The energy recovery wheel shall be mounted in a rigid frame containing the wheel drive motor, drive belt, wheel seals and bearings. Frame shall slide out for service and removal from the cabinet.

B. The energy recovery component shall incorporate a rotary wheel in an insulated cassette frame complete with seals, drive motor and drive belt.

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C. Wheel shall be wound continuously with one flat and one structured layer in an ideal parallel plate geometry providing laminar flow and minimum pressure drop-to-efficiency ratios. The layers shall be effectively captured in stainless steel wheel frames or aluminum and stainless steel segment frames that provide a rigid and self-supporting matrix.

D. Wheel shall be provided with removable energy transfer matrix. Wheel frame construction shall be a welded hub, spoke and rim assembly of stainless, plated and/or coated steel and shall be self-supporting without matrix segments in place. Segments shall be removable without the use of tools to facilitate maintenance and cleaning. Wheel bearings shall be selected to provide an

L-10 life in excess of 400,000 hours. Rim shall be continuous rolled stainless steel and the wheel shall be connected to the shaft by means of taper locks.

E. All diameter and perimeter seals shall be provided as part of the cassette assembly and shall be factory set. Drive belts of stretch urethane shall be provided for wheel rim drive without the need for external tensioners or adjustment.

F. The energy recovery cassette shall be an Underwriters Laboratories Recognized Component for electrical and fire safety. The wheel drive motor shall be an Underwriters Laboratory

Recognized Component and shall be mounted in the cassette frame and supplied with a service connector or junction box. Thermal performance shall be certified by the manufacturer in accordance with ASHRAE Standard 84, Method of Testing Air-to-Air Heat Exchangers and

AHRI Standard 1060, Rating Air-to-Air Energy Recovery Ventilation Equipment. Cassettes shall be listed in the AHRI Certified Products.

G. Energy recovery wheel cassette shall carry a 5 year non-prorated warranty, from the date of original equipment shipment from the factory. The first 12 months from the date of equipment startup, or 18 months from the date of original equipment shipment from the factory, whichever is less, shall be covered under the standard AAON limited parts warranty. The remaining period of the warranty shall be covered by Airxchange. The 5 year warranty applies to all parts and components of the cassette, with the exception of the motor, which shall carry an 18 month warranty. Warranty shall cover material and workmanship that prove defective, within the specified warranty period, provided the Airxchange written instructions for installation, operation and maintenance have been followed. Warranty excludes parts associated with routine maintenance, such as belts. Refer to the Airxchange Energy Recovery Cassette Limited

Warranty Certificate.

H. Unit shall include 4 inch thick, pleated panel outside air filters with an ASHRAE efficiency of

30% and MERV rating of 8, upstream of the wheels.

I. Hinged service access doors shall allow access to the wheel.

J. Total energy recovery wheels shall be coated with silica gel desiccant permanently bonded by a process without the use of binders or adhesives, which may degrade desiccant performance. The substrate shall be lightweight polymer and shall not degrade nor require additional coatings for application in marine or coastal environments. Coated segments shall be washable with detergent or alkaline coil cleaner and water. Desiccant shall not dissolve nor deliquesce in the presence of water or high humidity.

K. Unit shall include energy recovery wheel defrost control which includes an adjustable temperature sensor and timer wired to periodically stop the wheel rotation, which allows the warm exhaust air to defrost the wheel.

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2.10 CONDENSING SECTION

A. Air Cooled Condenser

1. Condenser fans shall be a vertical discharge, axial flow, direct drive fans.

2. Coils shall be designed for use with R-410A refrigerant and constructed of copper tubes with aluminum fins mechanically bonded to the tubes and aluminum end casings. Fin design shall be sine wave rippled.

3. Coils shall be designed for a minimum of 10°F of refrigerant sub-cooling.

4. Coils shall be helium leak tested.

B. Scroll Compressors - Compressors shall be digital scroll type with thermal overload protection, independently circuited.

1. All compressors shall be variable capacity scroll compressors on the lead and lag refrigeration circuits and be capable of modulation from 10-100% of its capacity. A minimum of two circuits is required. Hot Gas Bypass is not acceptable.

2. Each compressor shall be complete with gauge ports, crankcase heater, sight-glass, anti-slug protection, motor overload protection and a time delay to prevent short cycling and simultaneous starting of compressors following a power failure.

3. Compressors shall be isolated with resilient rubber isolators to decrease noise transmission.

4. First capacity stage shall be provided with on/off condenser fan cycling and adjustable compressor lockout down to allow cooling operation down to 35 o F.

5. Each refrigeration circuit shall be equipped with automatic reset low pressure and manual reset high pressure refrigerant safety controls, Schrader type service fittings on both high and low pressure sides and replaceable core liquid line filter driers.

C. Modulating hot gas reheat coil shall be provided. Refrigeration circuit shall be provided with hot gas reheat coil, modulating valves, electronic controller, supply air temperature sensor and a control signal terminal which allow the unit to have a dehumidification mode of operation, which includes supply air temperature control to prevent supply air temperature swings and overcooling of the space.

2.11 ROOF CURBS

A. Prefabricated 12-gauge galvanized steel, mounting curb, designed and manufactured by the unit manufacturer, shall be provided for field assembly on the roof decking prior to unit shipment.

The roof curb shall be a full perimeter type with complete perimeter support of the air handling section and rail support of the condensing section. Curb shall be adjustable pitch with a solid bottom for supply and return duct connections. The curb shall be a minimum of 16" high and include a nominal 2-inch x 4-inch wood nailing strip. Gasket shall be provided for field mounting between the unit base and roof curb.

1. Rooftop unit shall attach to the curb with stainless steel spring vibration isolators.

2. Roof curb to accommodate a 1/12 roof slope to allow the unit to sit level and plumb

(verify with general contractor).

2.12 CONTROLS

A. Unit controller shall be capable of controlling all features and options of the unit. Controller shall be factory installed in the unit controls compartment and factory tested. Controller shall be capable of stand-alone operation with unit configuration, setpoint adjustment, sensor status

PACKAGE ROOFTOP UNIT (RTU) 23 7400 - Page 10 of 14 viewing, unit alarm viewing, and occupancy scheduling available without dependence on a building management system.

B. Controller shall have an on board clock and calendar functions that allow for occupancy scheduling.

C. Controller shall include non-volatile memory to retain all programmed values without the use of a battery, in the event of a power failure.

2.13 VARIABLE AIR VOLUME CONTROLLER

A. Unit shall utilize a variable capacity compressor system and a variable speed supply fan system to modulate cooling and airflow as required to meet space temperature cooling loads and to save operating energy. Supply fan speed shall modulate based on supply air duct static pressure.

Cooling capacity shall modulate based on supply air temperature.

B. With modulating hot gas reheat, unit shall modulate cooling and hot gas reheat as efficiently as possible, to meet space humidity loads and prevent supply air temperature swings and overcooling of the space.

C. Unit shall modulate heating with constant airflow to meet space temperature heating loads.

D. Open Communications Protocol – The unit control system shall have the ability to communicate to an independent Building Management System (BMS) through a direct BACnet MSTP networ

E. It will be the responsibility of the EMS Contractor to integrate the rooftop data into the BMS system and interface. It will be the responsibility of the RTU manufacturer to assist in the integration, and make any programming and commissioning changes if required.

F. Unit configuration, set point adjustment, sensor status viewing, unit alarm viewing, and occupancy scheduling shall be accomplished with a TouchSreen User Interface Module.

Controller shall be capable of connection with other factory installed and factory provided unit controllers with individual unit configuration, set point adjustment, sensor status viewing, and occupancy scheduling available from a single unit.. Controller shall be capable of communicating and integrating with a BACnet network

2.14 DAMPERS

A. General Requirements for Dampers: Leakage rate, according to AMCA 500, "Laboratory

Methods for Testing Dampers for Rating," shall not exceed 2% of air quantity at 2000-fpm (10-m/s) face velocity through damper and 4-inch wg pressure differential.

B. Damper Operators: Comply with requirements in SECTION 230900 - HVAC

INSTRUMENTATION AND CONTROLS.

C. Outdoor- and Return-Air Dampers: Low-leakage, double-skin, airfoil-blade, galvanized-steel dampers with compressible jamb seals and extruded-vinyl blade edge seals in opposed or parallel-blade arrangement with steel operating rods rotating in stainless-steel sleeve bearings mounted in a single galvanized-steel frame, and with operating rods connected with a common linkage. Leakage rate shall not exceed 5 cfm/sq. ft. at 1-inch wg and 9 cfm/sq. ft. at 4-inch wg.

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2.15 ELECTRICAL

A. Unit wiring shall comply with NEC requirements and with all applicable UL standards. All electrical components shall be UL recognized where applicable. All wiring and electrical components provided with unit shall be number and color coded and labeled according to the electrical diagram provided for easy identification. The unit shall be provided with a factory wired weatherproof control panel. Unit shall have a single point power terminal block for main power connection. A terminal board shall be provided for low voltage control wiring. Branch circuit short circuit protection, 120 volt control circuit transformer and fuse, system switches, and a high temperature sensor. Each compressor and condenser fan motor shall be furnished with contactors and inherent thermal overload protection. Supply and return fan motors shall have contactors and external overload protection. Knockouts shall be provided in the bottom of the main control panels for field wiring entrance. All 120-600 volt internal and external wiring between control boxes and components shall be protected from damage by raceways or conduit.

B. Variable frequency drives shall be factory wired and mounted in the unit for both the supply and return fans. Fan motors shall be premium efficiency. Motors shall comply with requirements in

SECTION 230513 – MOTORS. Variable Frequency Drives shall comply with requirements in

SECTION 230514 – VARIABLE FREQUENCY DRIVES FOR HVAC EQUIPMENT.

C. All variable frequency drives, controls transformers, starters, control cabinets, wiring, and related accessories and appurtenances are the responsibility of the rooftop unit manufacturer and must be sized and provided accordingly. Each of these electrical equipment items are to be factory wired and mounted.

A. Unit shall be single point power with a non-fused disconnect switch mounted on the unit.

1. Burner/combustion, Supply Fan/VFD, Return Fan/VFD, Compressors and

Condenser Fans, and controls.

2. Unit shall include a factory installed 24V control circuit transformer.

3. A receptacle shall be powered by a factory installed and wired 120V, 15 amp power supply. The power supply shall be wired to the line side of the unit's main disconnect, so the receptacle is powered when the main unit disconnect is off. This option shall include a weather proof transformer and disconnect. The electrical circuit shall be complete with primary fused, overload protection.

2.16 CAPACITIES AND CHARACTERISTICS

A. As schedule on the Drawings.

2.17 SOURCE QUALITY CONTROL

A. Fan Sound-Power Level Ratings: Comply with AMCA 301. Test fans according to AMCA 300.

Fans shall bear AMCA-certified sound ratings seal.

B. Fan Performance Rating: Factory test fan performance for airflow, pressure, power, air density, rotation speed, and efficiency. Rate performance according to AMCA 210.

C. Water Coils: Factory tested to 300 psig according to ARI 410 and ASHRAE 33.

D. D. Refrigerant Coils: Factory tested to 450 psig according to ARI 410 and

ASHRAE 33.

PACKAGE ROOFTOP UNIT (RTU) 23 7400 - Page 12 of 14

2.18 WARRANTY

A. The manufacturer shall provide 12 month parts only warranty. Defective parts will be repaired or replaced during the warranty period at no charge. The warranty period shall commence at start up, or 6 months after shipment, whichever occurs first.

B. The manufacturer will provide extended 4 Year parts only warranty on the compressor.

C. The manufacturer will provide 25 Year Non-Prorated parts only warranty on the heat exchanger.

PART 3 - EXECUTION

3.1 EXAMINATION

A. Examine areas and conditions, with Installer present, for compliance with requirements for installation tolerances and other conditions affecting performance of the Work.

B. Examine casing insulation materials and filter media before air-handling unit installation. Reject insulation materials and filter media that are wet, moisture damaged, or mold damaged.

C. Examine roughing-in for steam, hydronic, and condensate drainage piping systems and electrical services to verify actual locations of connections before installation.

D. Proceed with installation only after unsatisfactory conditions have been corrected.

3.2 INSTALLATION

A. Equipment Mounting: Install air-handling units on concrete bases using elastomeric pads.

Secure units to anchor bolts installed in concrete bases. Comply with requirements for concrete bases specified in DIVISION 03. Comply with requirements for vibration isolation devices specified in SECTION 230548 - MECHANICAL VIBRATION AND SEISMIC CONTROLS.

B. Arrange installation of units to provide access space around air-handling units for service and maintenance.

C. Do not operate fan system until filters (temporary or permanent) are in place. Replace temporary filters used during construction and testing, with new, clean filters.

D. If rooftops are used during construction, filtration media with a Minimum Efficiency Reporting

Valve (MERV) of 8 shall be used at each return grille. Remove temporary filters immediately prior to final test and balancing.

E. Install filter-gauge, static-pressure taps upstream and downstream of filters. Mount filter gauges on outside of filter housing or filter plenum in accessible position. Provide filter gauges on filter banks, installed with separate static-pressure taps upstream and downstream of filters.

3.3 CONNECTIONS

A. Comply with requirements for piping specified in other DIVISIONS 22 and 23 Sections.

Drawings indicate general arrangement of piping, fittings, and specialties.

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B. Install piping adjacent to air-handling unit to allow service and maintenance.

C. Connect duct to air-handling units with flexible connections. Comply with requirements in

SECTION 233300 - DUCT ACCESSORIES.

3.4 FIELD QUALITY CONTROL

A. Manufacturer's Field Service: Engage a factory-authorized service representative to inspect, test, and adjust components, assemblies, and equipment installations, including connections.

B. Perform tests and inspections.

1. Manufacturer's Field Service: Engage a factory-authorized service representative to inspect components, assemblies, and equipment installations, including connections, and to assist in testing.

C. Tests and Inspections:

1. Leak Test: After installation, fill water and steam coils with water, and test coils and connections for leaks.

2. Charge refrigerant coils with refrigerant and test for leaks.

3. Fan Operational Test: After electrical circuitry has been energized, start units to confirm proper motor rotation and unit operation.

4. Test and adjust controls and safeties. Replace damaged and malfunctioning controls and equipment.

D. Air-handling unit or components will be considered defective if unit or components do not pass tests and inspections.

E. Prepare test and inspection reports.

3.5 STARTUP SERVICE

A. Engage a factory-authorized service representative to perform startup service.

1. Complete installation and startup checks according to manufacturer's written instructions.

2. Verify that shipping, blocking, and bracing are removed.

3. Verify that unit is secure on mountings and supporting devices and that connections to piping, ducts, and electrical systems are complete. Verify that proper thermal-overload protection is installed in motors, controllers, and switches.

4. Verify proper motor rotation direction, free fan wheel rotation, and smooth bearing operations. Reconnect fan drive system, align belts, and install belt guards.

5. Verify that bearings, pulleys, belts, and other moving parts are lubricated with factory-recommended lubricants.

6. Verify that outdoor- and return-air mixing dampers open and close, and maintain minimum outdoor-air setting.

7. Comb coil fins for parallel orientation.

8. Install new, clean filters.

9. Verify that manual and automatic volume control and fire and smoke dampers in connected duct systems are in fully open position.

10. Verify roof curb installation and support.

B. Starting procedures for air-handling units include the following:

PACKAGE ROOFTOP UNIT (RTU) 23 7400 - Page 14 of 14

1. Energize motor; verify proper operation of motor, drive system, and fan wheel. Adjust fan to indicated rpm. Replace fan and motor pulleys as required to achieve design conditions.

2. Measure and record motor electrical values for voltage and amperage.

3. Manually operate dampers from fully closed to fully open position and record fan performance.

3.6 ADJUSTING

A. Adjust damper linkages for proper damper operation.

B. Comply with requirements in SECTION 230900 - TESTING, ADJUSTING, AND

BALANCING for air-handling system testing, adjusting, and balancing.

3.7 CLEANING

A. After completing system installation and testing, adjusting, and balancing air-handling unit and air-distribution systems and after completing startup service, clean air-handling units internally to remove foreign material and construction dirt and dust. Clean fan wheels, cabinets, dampers, enthalpy wheel, coils, and filter housings, and install new, clean filters.

3.8 DEMONSTRATION

A. Engage a factory-authorized service representative to train Owner's maintenance personnel to adjust, operate, and maintain air-handling units.

END OF SECTION 23 7400