Section 23 7412 - Packaged Outdoor Rooftop Units - Small Capacity.pdf

23 - HEATING, VENTILATING, AND AIR-CONDITIONING (HVAC) S3A

2020-019 / Oregon Employment Department

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SECTION 23 7412

PACKAGED OUTDOOR ROOFTOP UNITS - SMALL CAPACITY

PART 1 GENERAL

1.01 SECTION INCLUDES

A. Packaged roof top unit.

B. Roof mounting curb.

C. Thermostat.

D. Maintenance service.

1.02 RELATED REQUIREMENTS

A. Section 23 0548 - Vibration Isolation and Sound and Seismic Controls for HVAC Piping and Equipment.

B. Section 23 0549 - HVAC Seismic Restraint.

C. Section 23 0913 - Instrumentation and Control Devices for HVAC Controls.

D. Section 23 0993 - Sequence of Operations for HVAC Controls.

E. Section 23 3300 - Air Duct Accessories.

F. Division 26: Electrical characteristics and wiring connections.

1.03 REFERENCE STANDARDS

A. ANSI/AMCA Standard 500-D-07, "Laboratory Methods of Testing Dampers for Rating";

2007.

B. ASTM B117 - Standard Practice for Operating Salt Spray (Fog) Apparatus; American Society for Testing and Materials.

C. NFPA 54 - National Fuel Gas Code; National Fire Protection Association.

1.04 SUBMITTALS

A. See Section 01 3000 - Administrative Requirements, for submittal procedures.

B. Product Data: Provide capacity and dimensions of manufactured products and assemblies required for this project. Indicate electrical service with electrical characteristics and connection requirements, and duct connections.

C. Shop Drawings: Indicate capacity and dimensions of manufactured products and assemblies required for this project. Indicate electrical service with electrical characteristics and connection requirements, and duct connections.

D. Manufacturer's Instructions: Indicate assembly, support details, connection requirements, and include start-up instructions.

E. Operation and Maintenance Data: Include manufacturer's descriptive literature, operating instructions, installation instructions, maintenance and repair data, and parts listing.

F. Warranty: Submit manufacturer's warranty and ensure forms have been filled out in Owner's name and registered with manufacturer.

G. Maintenance Materials: Furnish the following for Owner's use in maintenance of project.

1. See Section 01 6000 - Product Requirements, for additional provisions.

2. Extra Filters: One set for each unit.

3. Fan Belts: One set for each unit.

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1.05 QUALITY ASSURANCE

A. Manufacturer Qualifications: Company specializing in manufacturing the type of products specified in this section, with minimum 10 years of documented experience.

B. Products Requiring Electrical Connection: Listed and classified by Underwriters Laboratories Inc. as suitable for the purpose specified and indicated.

1.06 DELIVERY, STORAGE, AND HANDLING

A. Protect units from physical damage by storing off site until roof mounting curbs are in place, ready for immediate installation of units.

1.07 WARRANTY

A. See Section 01 7800 - Closeout Submittals, for additional warranty requirements.

B. Provide a five year warranty to include coverage for refrigeration compressors and heat exchangers.

PART 2 PRODUCTS

2.01 ROOFTOP AIR CONDITIONING UNITS

A. Manufacturers:

1. Carrier Corp.

2. Rheem Manufacturing.

3. The Trane Company.

4. York International.

5. Substitutions: See Section 01 6000 - Product Requirements.

B. Product Description: Self-contained, packaged, factory assembled and wired, consisting of roof curb, cabinet, supply fan, refrigerant cooling coil, compressor, refrigeration circuit, condenser, gas-fired heating section, electric or hot water heating coil, air filters, mixed air casing, controls, and accessories.

C. Configuration: As indicated on Drawings.

D. Roof Mounting Curb: 14 inch high, galvanized steel, channel frame with gaskets, nailer strips. Full perimeter type for mounting under entire unit.

E. Cabinet:

1. Designed for outdoor installation with weatherproof construction.

2. Panels: Constructed of galvanized steel with baked enamel finish meeting salt spray test in accordance with ASTM B117. Furnish access doors or removable access panels.

3. Insulation: Factory applied to exposed vertical and horizontal panels, 1/2-inch thick aluminum foil faced foam or glass fiber with edges protected from erosion.

F. Supply Fan: Forward curved centrifugal type, resiliently mounted with direct drive (under 3 tons) and V-belt drive or adjustable variable pitch motor pulley (3 tons and over) and high efficiency motor. Motor permanently lubricated with built-in thermal overload protection.

G. Evaporator Coil: Constructed of copper tubes expanded onto aluminum fins. Galvanized drain pan with piping connection. Factory leak tested under water.

H. Compressor: Hermetically sealed, resiliently mounted with positive lubrication, and internal motor overload protection. Furnish vibration isolators and short cycle protection.

I. Refrigeration circuit: Furnish the following for each circuit: fixed orifice control (under 3 tons) or thermal expansion valve (3 tons and over), filter-drier, suction, discharge, and liquid line

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23 7412 service valves with gauge ports, high and low pressure safety controls. Dehydrate and factory charge each circuit with oil and refrigerant.

J. Condenser:

1. Coil: Copper tube with aluminum or copper fin coil assembly. Factory leak tested under water.

2. Condenser Fan: Direct drive propeller fans statically and dynamically balanced. Wired to operate with compressor. Motor permanently lubricated with built-in thermal overload protection. Furnish high efficiency fan motors.

K. Gas-Fired Heating Section:

1. Fuel: Natural gas.

2. Heat Exchangers: Stainless steel.

3. Gas Burner: Induced draft type burner with adjustable combustion air supply, pressure regulator, gas valves, manual shut-off, intermittent spark or glow coil ignition and flame sensing device. Require unit fan operation before allowing gas valve to open.

L. Air Filters: 2 thick glass fiber disposable media in metal frames. 30 percent efficiency based on ASHRAE 52 (MERV 8 based on ASHRAE 52.2).

M. Mixed Air Casing:

1. Damper Leakage: Furnish Class I motorized dampers with maximum leakage rate of 4 cfm per square foot at 1-inch water column pressure differential when tested in accordance with AMCA 500D.

2. Economizer: Factory installed fully modulating motorized outside air and return air dampers controlled by dry bulb or enthalpy controller with minimum position setting.

Outside air damper normally closed and return air damper normally open. Furnish barometric relief damper capable of closing by gravity (3 tons and under) and barometric relief damper with powered exhaust (above 3 tons). Furnish rain hood with screen.

N. Controls:

1. Provide terminal strip on unit for connection of operating controls to remote panels.

2. Refer to Section 23 0913, 23 0923, and 23 0993.

O. Accessories:

1. Convenience Outlet: Factory installed, 115 volt, 15 amp, GFCI type, internally mounted.

P. Capacity:

1. Refer to Drawing schedules.

2.02 ELECTRICAL CHARACTERISTICS AND COMPONENTS

A. Electrical Characteristics: In accordance with Division 26.

B. Disconnect Switch: Factory mounted, non-fused type, interlocked with access door, accessible from outside unit, with power lockout capability.

PART 3 EXECUTION

3.01 EXAMINATION

A. Verify that roof is ready to receive work and opening dimensions are as indicated on shop drawings.

B. Verify that proper power supply is available.

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3.02 INSTALLATION

A. Roof Curb:

1. Assemble roof curb.

2. Install roof curb level.

3. Coordinate curb installation and flashing with Architect.

4. Install units on roof curb providing watertight enclosure to protect ductwork and utility services.

5. Install gasket material between unit base and roof curb.

B. Install units on vibration isolators. Refer to Section 23 0548.

C. Connect units to supply and return ductwork with flexible connections. Refer to Section 23 3300.

D. Install condensate piping with trap and route from drain pan to splash block on roof.

E. Install components furnished loose for field mounting.

F. Install electrical devices furnished loose for field mounting.

G. Install control wiring between unit and field installed accessories.

H. Remove from roof and dispose off-site panels removed from units during installation of economizer and dampers.

I. Locate remote panels as indicated on Drawings.

J. Provide fixed sheaves required for final air balance.

3.03 INSTALLATION - NATURAL GAS HEATING SECTION

A. Connect natural gas piping in accordance with NFPA 54.

B. Connect natural gas piping to unit, full size of unit gas train inlet. Arrange piping with clearances for burner service.

C. Install the following piping accessories on natural gas piping connections. Refer to Section 23 1113.

1. Strainer.

2. Pressure gage.

3. Shutoff valve.

4. Pressure reducing valve.

D. Install natural gas piping accessories above roof, within unit casing, or below roof.

3.04 MANUFACTURER'S FIELD SERVICES

A. Section 01 4000 - Quality Requirements: Requirements for manufacturer's field services.

B. Furnish initial start-up and shutdown during first year of operation, including routine servicing and checkout.

C. Furnish services of factory trained representative for minimum of one day to leak test, refrigerant pressure test, evacuate, dehydrate, charge, start-up, calibrate controls, and instruct Owner on operation and maintenance.

3.05 CLEANING

A. Section 01 7000 - Execution Requirements: Requirements for cleaning.

B. Vacuum clean coils and inside of unit cabinet.

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C. Install temporary filters during construction period. Replace with permanent filters at Substantial Completion.

3.06 DEMONSTRATION

A. Section 01 7000 - Execution Requirements: Requirements for demonstration and training.

B. Demonstrate unit operation and maintenance.

C. Furnish services of manufacturer's technical representative for one 8 hour day to instruct Owner's personnel in operation and maintenance of units. Schedule training with Owner, provide at least 7 days notice to Architect/Engineer of training date.

END OF SECTION 23 7412

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