UNIRAC SunFrame Installation Manual
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Unirac Code-Compliant Installation Manual Unirac welcomes input concerning the accuracy and user-friendliness of this publication. Please write to [email protected]. Pub 15JAN01-1cc © 2014 - 15 Unirac, Inc. All rights reserved. i. Installer’s Responsibilities .................................................................2 Part I. Procedure to Determine the Total Design Wind Load ..
UNIRAC SunFrame, Page 2 Unirac Code-Compliant Installation Manual SunFrame R 1411 Broadway Boulevard NE Albuquerque NM 87102-1545 USA i. Installer’s Responsibilities Please review this manual thoroughly before installing your SunFrame system. This manual provides (1) supporting documentation for building permit applications relating to Unirac’s SunFrame Universal PV Module Mounting system, and (2) planning and assembly instructions for SunFrame SunFrame products, when installed in accordance with this bulletin, will be structurally adequate and will meet the structural requirements of the IBC 2009, ASCE 7-05 and California Building
UNIRAC SunFrame, Page 3 SunFrame Unirac Code-Compliant Installation Manual R 1411 Broadway Boulevard NE Albuquerque NM 87102-1545 USA The procedure to determine Design Wind Load is specified by the American Society of Civil Engineers and referenced in the International Building Code 2009. For purposes of this document, the values, equations and procedures used in this document reference ASCE 7-05, Minimum Design Loads for Buildings and Other Structures. Please refer to ASCE 7-05 if you have any questions about the definitions or procedures presented in this manual. Un
UNIRAC SunFrame, Page 4 Unirac Code-Compliant Installation Manual SunFrame R 1411 Broadway Boulevard NE Albuquerque NM 87102-1545 USA Miles per hour (meters per second) Figure 1. Basic Wind Speeds. Adapted and applicable to ASCE 7-05. Values are nominal design 3-second gust wind speeds at 33 feet above ground for Exposure Category C. 10 3 3 3 3 3 4 4 4 4 4 4 4 5 6 7 8 12 16 20 15 3 3 3 3 3 4 5 6 6 6 6 6 6 6 7 8 12 16 20 20 3 3 3 3 3 4 5 6 7 8 8 8 8 8 8 8 12 16 20 25 3 3 3 3 3 4 5 6 7 8 9 10 10 10 10 10 12 16 20 30 3 3 3 3 3 4 5 6 7 8 9 10 12 12 12 12 12 16 20 35 3 3 3 3 3 4 5 6 7 8 9 10 12.5 14 14 14 14 16 20 40 3 3 3 3 3 4 5 6 7 8 9 10 12.5 15 16 16 16 16 20 45 3 3 3
UNIRAC SunFrame, Page 5 SunFrame Unirac Code-Compliant Installation Manual R 1411 Broadway Boulevard NE Albuquerque NM 87102-1545 USA Step 4: Determine Net Design Wind Pressure, p net30 (psf): Using the Effective Wind Area (Step 2), Roof Zone Location (Step 3), and Basic Wind Speed (Step 1), look up the appropriate Net Design Wind Pressure in Table 2, page 6. Use the Effective Wind Area value in the table which is smaller than the value calculated in Step 2. If the installation is located on a roof overhang, use Table 3, page 7. Both downforce and uplift pressures must be considered in overall design. Refer to Section II, Step 1 for applying downforce and uplift pressur
UNIRAC SunFrame, Page 6 Unirac Code-Compliant Installation Manual SunFrame R 1411 Broadway Boulevard NE Albuquerque NM 87102-1545 USA 1 10 5.9 -14.6 7.3 -18.0 8.9 -21.8 10.5 -25.9 12.4 -30.4 14.3 -35.3 16.5 -40.5 21.1 -52.0 1 20 5.6 -14.2 6.9 -17.5 8.3 -21.2 9.9 -25.2 11.6 -29.6 13.4 -34.4 15.4 -39.4 19.8 -50.7 1 50 5.1 -13.7 6.3 -16.9 7.6 -20.5 9.0 -24.4 10.6 -28.6 12.3 -33.2 14.1 -38.1 18.1 -48.9 1 100 4.7 -13.3 5.8 -16.5 7.0 -19.9 8.3 -23.7 9.8 -27.8 11.4 -32.3 13.0 -37.0 16.7 -47.6 2 10 5.9
UNIRAC SunFrame, Page 7 SunFrame Unirac Code-Compliant Installation Manual R 1411 Broadway Boulevard NE Albuquerque NM 87102-1545 USA 2 10 -21.0 -25.9 -31.4 -37.3 -43.8 -50.8 -58.3 -74.9 2 20 -20.6 -25.5 -30.8 -36.7 -43.0 -49.9 -57.3 -73.6 2 50 -20.1 -24.9 -30.1 -35.8 -42.0 -48.7 -55.9 -71.8 2 100 -19.8 -24.4 -29.5 -35.1 -41.2 -47.8 -54.9 -70.5 3 10 -34.6 -42.7 -51.6 -61.5 -72.1 -83.7 -96.0 -123.4 3 20 -27.1 -33.5 -40.5 -48.3 -56.6 -65.7 -75.4 -96.8 3 50 -17.3 -21.4 -25.9 -30.8 -36.1 -41.9 -48.1 -61.8 3 100 -10.0 -12.2 -14.8 -17.6 -20.6 -23.9 -27.4 -35.2 2 10 -27.2 -3
UNIRAC SunFrame, Page 8 Unirac Code-Compliant Installation Manual SunFrame R 1411 Broadway Boulevard NE Albuquerque NM 87102-1545 USA 15 1.00 1.21 1.47 20 1.00 1.29 1.55 25 1.00 1.35 1.61 30 1.00 1.40 1.66 35 1.05 1.45 1.70 40 1.09 1.49 1.74 45 1.12 1.53 1.78 50 1.16 1.56 1.81 55 1.19 1.59 1.84 60 1.22 1.62 1.87 B C D Table 4. Adjustment Factor (λ) for Roof Height & Exposure Category Source: ASCE/SEI 7-05, Minimum Design Loads for Buildings and Other Structures, Chapter 6, Figure 6-3, p. 44. Exposure Mean roof height (ft
UNIRAC SunFrame, Page 9 SunFrame Unirac Code-Compliant Installation Manual R 1411 Broadway Boulevard NE Albuquerque NM 87102-1545 USA Table 6. Occupancy Category Importance Factor Source: IBC 2009, Table 1604.5, Occupancy Category of Buildings and other structures, p. 281; ASCE/SEI 7-05, Minimum Design Loads for Buildings and Other Structures, Table 6-1, p. 77 Category DesicriptionCategory Building Type Examples Non-Hurricane Prone Regions and Hurricane Prone Regions with Basic Wind Speed, V = 85-100 mph, and Alaska Hurricane Prone Re- gions with Basic Wind Speed, V > 100mph I II III IV Buildings and other structures that represent a low hazard to
Page 10 Unirac Code-Compliant Installation Manual SunFrame R 1411 Broadway Boulevard NE Albuquerque NM 87102-1545 USA The procedure to determine the Unirac SunFrame series rail type and rail span uses standard beam calculations and structural engineering methodology. The beam calculations are based on a simply supported beam conservatively, ignoring the reducti
Page 11 SunFrame Unirac Code-Compliant Installation Manual R 1411 Broadway Boulevard NE Albuquerque NM 87102-1545 USA Step 2a: Determine the Distributed Load on the rail based on uplift and downforce, w (plf): Determine the Distributed Load, w (plf), by multiplying the module dimension, B (ft), by the Total Design Load, P (psf). Use the maximum a
UNIRAC SunFrame, Page 12 Unirac Code-Compliant Installation Manual SunFrame R 1411 Broadway Boulevard NE Albuquerque NM 87102-1545 USA Step 4: Select Rail Type: Selecting a span affects the price of your installation. Longer spans produce fewer wall or roof penetrations. However, longer spans create higher point load forces on the building structure. A point load force is the amount of force transferred to the building structure at each connection. It is the installer’s responsibility to verify that the building structure is strong enough to support the point load forces. Step 5: Determine the Downforce Point Load, R (lbs), at each c
Page 13 SunFrame Unirac Code-Compliant Installation Manual R 1411 Broadway Boulevard NE Albuquerque NM 87102-1545 USA Total Design Load (downforce) (max of case 1, 2 or 3) P psf Step 1 Module length perpendicular to rails B x ft Rail Span L x ft Step 4 Downforce Point Load R lbs Table 9. Downforce Point Load Calculation Step 6: Determine the Uplift Point Load
UNIRAC SunFrame, Page 14 Unirac Code-Compliant Installation Manual SunFrame R 1411 Broadway Boulevard NE Albuquerque NM 87102-1545 USA Figure 5. SunFrame threaded slot rail, cross section, actual size. 1 10 8 9 3 2 1 5 4 4 1 5 12 3 6 2 1 11 7 8 9 Figure 4. SunFrame components. The Unirac Code-Compliant Installation Instructions supports applications for building permits for photovoltaic arrays using Unirac PV module mounting systems. This manual, SunFrame Rail Planning and Assembly, governs installations using the SunFrame systems. [3.1.] SunFrame ® rail components: Part III. Installi
UNIRAC SunFrame, Page 15 SunFrame Unirac Code-Compliant Installation Manual R 1411 Broadway Boulevard NE Albuquerque NM 87102-1545 USA 1. Rail — Supports PV modules. Use one per row of modules plus one. Shipped in 8- or 16-foot lengths. Aluminum extrusion, anodized (clear or dark bronze) to match PV module frame. 2. Cap strip — Secures PV modules to rails and neatly frames top of array. Lengths equals rail lengths. Cap strips are sized for specific PV modules. Shipped in 8- or 16-foot lenghs. Predrilled every 8 i
UNIRAC SunFrame, Page 16 Unirac Code-Compliant Installation Manual SunFrame R 1411 Broadway Boulevard NE Albuquerque NM 87102-1545 USA Sample layout, illustrated in Figure 6 Assumptions: 12 modules (60˝ x 36˝), arranged in 4 rows of 3 modules 4 rows will need 5 shared rails Array width = 180˝ (60˝ module width x 3 columns) Array length = 144˝ (36˝ module width x 4 rows) + 3˝ (1½˝ end rail width x 2 rails) + 2 ¼˝ (¾˝ between-module rail width x 3 rails) = 149¼˝ Safe, efficient SunF
UNIRAC SunFrame, Page 17 SunFrame Unirac Code-Compliant Installation Manual R 1411 Broadway Boulevard NE Albuquerque NM 87102-1545 USA 2. Installing the lowest row of L-feet and rail: In the lowest row, it is not necessary to use L-foot adjust- ing sliders, even if you plan to use them in subsequent rows. Install L-feet, in conjunction with proper flashing equipment and techniques, directly onto low profile roofing material such as asphalt shingles or sheet metal. (For high profile roofs, such as tile or shake, use optional standoffs with flashing to raise L-feet. L-feet must be flush with or above the highest point of the roof surface.) L-feet can be placed with the double-slotte
UNIRAC SunFrame, Page 18 Unirac Code-Compliant Installation Manual SunFrame R 1411 Broadway Boulevard NE Albuquerque NM 87102-1545 USA If the standoff supporting the lowest rail is 1 inch taller than the standoffs on the footing sliders, place both L-feet in the same orientation—either both long side up or both short side up. With standoffs of equal length, orient L-foot to compensate for height difference. Footing and splicing requirements The following criteria are required for sound insta
Page 19 SunFrame Unirac Code-Compliant Installation Manual R 1411 Broadway Boulevard NE Albuquerque NM 87102-1545 USA 4. Installing the second rail: With L-feet only (Fig. 12): Install and align the second rail in the same manner and orientation as the first rail. After rail alignment, tighten the rail mounting bolts. Lay one module in place at one end of the rails, and sn
UNIRAC SunFrame, Page 20 Unirac Code-Compliant Installation Manual SunFrame R 1411 Broadway Boulevard NE Albuquerque NM 87102-1545 USA Material planning for rails and cap strips Preplanning material use for your particular array can prevent structural or aesthetic problems, particularly those caused by very short lengths of rail or cap strip. This example illustrates one approach. Structural requirements for rails are detailed in “Footing and splicing requirements” (p.18). Structurally, cap strips require: • A screw in every prepunched hole (which occur every 8 inches, beginning 4 inche
UNIRAC SunFrame, Page 21 SunFrame Unirac Code-Compliant Installation Manual R 1411 Broadway Boulevard NE Albuquerque NM 87102-1545 USA 8. Installing the remaining modules row by row: Repeat Steps 6 and 7 for the remaining rows (Fig. 15). Each subsequent cap strip will secure the tops to the modules being installed and the bottoms of the modules in the row above. Place the final cap strip in the lowest rail, securing the bottom of the lowest module row. 6. Securing the first module: Gather sufficient lengths of cap strip to cover the length of the first rail. For maximum visual appeal and material conservation s
UNIRAC SunFrame, Page 22 Unirac Code-Compliant Installation Manual SunFrame R 1411 Broadway Boulevard NE Albuquerque NM 87102-1545 USA 9. Installing the end caps: Attach the end caps to the ends of the rails by securing with the truss head sheet metal screws provided (Fig. 16). Figure 16. End cap installation. Table 4: PV module, cap strip, and cap strip screw compatibility To ensure code compliance and a structurally sound array, cap strip sizes and cap strip screw lengths must be compatible with the P
UNIRAC SunFrame, Page 23 SunFrame Unirac Code-Compliant Installation Manual R 1411 Broadway Boulevard NE Albuquerque NM 87102-1545 USA Frequently asked questions about standoffs and roof variations How high above the roof is a SunFrame array? The answer depends on the orientation of your L-feet and the length of your standoffs, if used. See the illustration ap- propriate to your installation. How do I attach SunFrame to a standing-seam metal roof? Unirac is pleased to present ACECLAMP® JR, our latest so- lution for mounting r
UNIRAC SunFrame, Unirac Code-Compliant Installation Manual SunFrame Page 24 R 1411 Broadway Boulevard NE Albuquerque NM 87102-1545 USA R 1411 Broadway Boulevard NE Albuquerque NM 87102-1545 USA Warranty Information See http://www.unirac.com for current warranty documents and information.
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