rooftop unit installation detail

SINGLE PACKAGE ROOFTOP 48HC gas heater pdf manual download. Prior to setting the unit onto the curb, the installer should ensure that a sealing material is positioned between the unit and the curb to provide a watertight connection. see detail pressure gage, typ outdoor air thermostat setatdf [et-1]diahragm expansion tank see detail / automatic air vent from heating system air separator gate valve, typ flexible type mechanical couplings typ. “Typically the isolation in most installations arrives with the unit at the same time. Hinged doors are much easier to open/close than heavy and unwieldy panels that have to be physically removed by the service technician. At Budget Heating and Air Conditioning Inc., we are proud to be the leader in HVAC supplies, parts and equipment. Visit our updated, This website requires certain cookies to work and uses other cookies to help you have the best experience. Drawings are provided in AutoCAD® 1 DXF format (Drawing Interchange Format) and can be easily used in a variety of CAD software packages. Pre-engineered design flexibility: The more the design requirements for a project can be incorporated into the unit at the factory, the less field work you will face. That way it’s installed, it’s prepared, the rails have already been assembled and installed. h�bbd``b`^$O -�)�`�I��2OL] �,k��Ĳ �� ^7 HH�X;2�ހe`�=��N 7�?��!� �� 92 0 obj <> endobj And, a permanent lamicoid type label shall be installed at both the receptacle and the main disconnect for each rooftop unit indicating –“ CAUTION “ - Two separate power sources –XXX V for Rooftop unit and 120 V for maintenance receptacle” Adjust wording on the Caution label as required for appropriate voltage of the rooftop unit. %PDF-1.6 %�� COVID-19 has boosted customer interest in IAQ solutions. Then we wait for the unit to come in,” says Norton. The Carrier WeatherExpert® Packaged Rooftop Unit series provides comfort and energy efficiency never seen before. Especially the economizer sections; they need to be factory installed, factory wired, and they do not need to ship loose.”. To ensure that doesn’t happen on any of their jobs, Colonial Mechanical’s crews make sure everything is planned well in advance. Then typically we cap that entire enclosure with some type of sheet metal to protect it. Prodigy® 2.0 (M3 Unit Controller) GP3 Control (Repair Part) (13J79) Prodigy® 2.0 (M3 Unit Controller) GP3 Control Field Installation Kit (13J78) Prodigy® 2.0 (M3 Unit Controller) Replacement Cover (10X86) Prodigy® 2.0 (M3 Unit Controller) Setup Guide for Compatible Rooftop Units; Prodigy® (M2 Unit Controller) Firmware Update The roof curb should be installed by an experienced erector. SAVE THIS MANUAL JOHNSON CONTROLS SERIES 40 ROOFTOP 25, 30 & 40 TON 5276177-JIM-D-0118 MODELS: V2 V3 V4 Active Ventilation - Click to view drawings for all of our products. He says that many times parts that are shipped loose are lost altogether, which usually requires the crews to go back and do another service call after the equipment is installed. It seems that better quality control is needed on both sides of the equation — contractor and manufacturer — to ensure a premium installation. operations on the unit, lock the power supply circuit in the open position ahead of the machine. This design is recommended for curb mounted packaged Rooftop Units 20 tons and larger. Single 2-Way Chilled Water Coil Piping Detail with 2-Way Control Valve. HVAC Heat Exchangers Explained The basics working principle how heat exchanger works - Duration: 19:17. The curb installation is critical to ensure a level installation. Elevation Views of Rooftop ACU. While you may pay for this flexibility in initial equipment expense, you can make up the difference in reduced field coordination and installation costs while delivering a higher-quality installation to your customer. In order to save money, manufacturers seem to have made their products more difficult rather than easier to service. Joanna has been with BNP Media since 1991, first heading up the company’s technical book division. CAUTION CUT HAZARD Failure to follow this caution may result in personal injury. All Rights Reserved BNP Media. We get the curb and the isolation rails set in advance of the unit delivery. And when they’re done with the installation, employees in Colonial Mechanical’s service department go through a checklist to make sure it was done correctly. Manufacturers can provide acceptable flashing details for new rooftop equipment and penetrations. tions on the unit, always turn off main power switch to unit and install lock(s) and lockout tag(s). View and Download Trane Voyager YS 150–300 installation, operation and maintenance manual online. When having work done, the roofing contractor should be authorized to perform the work by the manufacturer of the roof system. Single Package Rooftop Gas Heating/Electric Cooling Unit with Puron (R-410A) Refrigerant. “As far as the overall value to the customer, we feel like if they would look at the serviceability of the unit, it would save the end user customer money over the long haul.”, “Right now I think they leave that up to their representatives versus the factory,” Norton says. In addition to the concerns mentioned in the article about the quality of rooftop units, Robert Norton sees three problem areas: Restaurant Owners Hang Hopes on IAQ Solutions, Manufacturers Optimistic Over Heat Pump Outlook for the Upcoming Year, Refrigerant Concerns Top Agendas at Industry Events, California Approves Rules To Phase Down HFCs, Regular service keeps rooftop units in tip-top shape, Rooftop Units Designed To Help Improve IAQ, Rooftop Units Offer Advanced Ventilation Control. Voyager YS 150–300 air conditioner pdf manual download. Available in PDF and DWG formats for download or print. It supports the rooftop unit and transfers the load onto the roof’s structural members, streamlines ductwork connections, and provides the means to complete the weatherproof seal with the roof. With a 3-150 ton capacity range and efficiency ratings as high as 17.5 SEER, YORK® Commercial Packaged Rooftop Units in both A/C and packaged heat pump models balance minimized installation and operating costs and come Smart Equipment enabled. Packaged Rooftop Units, Heat Pumps, & Outdoor Air Handling Units Installation, Operation, & Maintenance o Do not store gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance o WHAT TO DO IF YOU SMELL GAS Do not try to light any appliance. And let’s not forget the need for a properly engineered rooftop unit. material gage to support the unit load will be furnished with the curb. h�b```a``^ "=�@��(��@T��!�6��֣\��n. Sanitary Cleanout Detail. 9. Pedestals Wood Tiles 2CM Pavers Paver Trays Site Furnishings From multi-family, mixed-use, government facilities, healthcare, and more – Bison Innovative Products offer the design flexibility to create versatile, unique outdoor spaces. All electrical wiring must not touch the refrigerant piping, or any moving parts of the fan motors. It takes forethought. Pre-fabricated fully assembled roof curbs will reduce installation time and costs by ensuring compatibility between the rooftop unit, curb and roof openings. Packaged Rooftop – Gas/ Electric 121/2 – 25 Tons, 60/50Hz Air Conditioners. They check the location of the duct in reference to the location of the duct connection on the unit. This is important for all roof types. And their technicians are also well versed in vibration isolation. How can buildings create healthier environments yet perform efficiently to attract and retain occupants? Many times the problems stem from the unit not being leveled in the first place. Roof Vents, Attic Fans, & more! Norton says that some manufacturers also seem to be cutting corners on their rooftop units, which is causing Colonial Mechanical’s service department some trouble. The rooftop unit may be mounted immediately after the curb is installed. Every YORK® Small Sunline Packaged Rooftop Unit comes standard with next-generation Smart Equipment and can connect seamlessly to a controls systems and self-discover other Smart Equipment. %%EOF To ensure proper duct “We’ve seen misapplications of vfd’s. If it’s not, the unit then will tilt one direction or the other and the weight will shift, and you don’t end up having any isolation.”. It’s not good enough to just show up on the roof and hope that the unit and everything else will be there when you arrive. By visiting this website, certain cookies have already been set, which you may delete and block. By closing this message or continuing to use our site, you agree to the use of cookies. Look for rooftop units that encourage rather than discourage maintenance by demanding convenient access to both sides of component sections using hinged and latched doors. INSTALLATION MANUAL CAUTION: READ ALL SAFETY GUIDES BEFORE YOU BEGIN TO INSTALL YOUR UNIT. They check the drain connection for the condensate. 3. It’s just lack of planning on the contractor’s part.”. They check the inside of the curb to see if there’s any problem with the sound batting. Constant Volume Mixed Air Unit Point Identification. “We’re seeing a tremendous amount of motor failure where the motors are undersized on the condenser fans, which is something we never used to see. So in an effort to get the unit set in a hurry, they take some shortcuts and set them, and they don’t properly check the curb to see if it is level. They want to see if they’ve increased or decreased the velocity, as in most cases, they’re looking to decrease the velocity coming off the unit. However, some manufacturers allow you to incorporate additional requirements such as blenders, special filtration, sound attenuators, and other specialty equipment as part of the factory-tested package. I want to hear from you. The roof curb is the interface between the building and the rooftop unit. Joanna Turpin is a Senior Editor. The packaged rooftop unit has become so familiar that many contractors don’t think too much about installing one anymore. Then there’s start-up — and a whole new checklist to work through. Serviceability: Rooftop units are mechanical systems that require periodic maintenance and service to maximize their service life and maintain peak performance. She obtained her bachelor’s degree in English from the University of Washington and worked on her master’s degree in technical communication at Eastern Michigan University. “Manufacturers need to have better quality control checks on their refrigeration circuits. Design, CMS, Hosting & Web Development :: ePublishing. Colonial Mechanical’s crews have made a science out of rooftop installation. which will result in enhanced installation, reliability, or operation. Look for rooftop units that encourage rather than discourage maintenance by demanding convenient access to both sides of component sections using hinged and latched doors. Unit may have more than one power switch. So with a little planning, some hard labor, and a well-designed rooftop unit, your customers are going to be thrilled with their comfort levels. If the trap is not deep enough, then typically you’ll have a problem with the condensate backing up, leaking into the unit,” says Norton. Norton believes that many rooftop installations are done incorrectly simply because contractors are not well prepared. But the truth of the matter is that a really good rooftop installation involves some finesse. The Engineering Mindset 130,957 views Copyright ©2021. We don’t allow that at our company. Disconnect from the main power supply before servicing the air conditioner unit. 3-28 Ton Rooftop Units – 48/50TC(Q), 48/50KC(Q), 48/50HC(Q), 48/50LC, EnergyX® models. If things aren’t level, “You end up with condensate not properly draining out of the pan, which can cause some humidity problems as well as environmental problems in the space. “They don’t worry about the duct connections, they think they can work it up through the curb later on, so usually they’re not prepared. 2 - 5 Tons. It takes planning. You must have JavaScript enabled to enjoy a limited number of articles over the next 30 days. DWG14. BudgetHeating HVAC Supplies - Heat Pumps, Gas Heaters, Split Units & More / Commercial & Home Heating & Cooling Supplies. Specifications Prefabricated roof curb to be manufactured of prime galvanized steel construction, 20 , 18, 16 or 14 gauge as required, meeting ASTM A653/653M, with welded corners and with seams joined by continuous water and air tight welds. VA Standard Details numbering system relates to specification MasterFormat 2004. Robert Norton of Colonial Mechanical, Richmond, VA, has seen more rooftop units in his lifetime than he’d probably care to admit. ... CAD download: library block blok family symbol detail part element entourage cell drawing category collection free. Norton says that he and his service department have seen numerous cases in which rooftop units were not installed properly. TIL Feedback - we welcome your suggestions at til@va.gov. Everyday needs, such as variable-frequency drives, economizers, and control valves, should come as part of the factory-tested package. 195 0 obj <>stream cat: HVAC. Rooftop Unit Drawings. Ensure electrical service to rooftop unit agrees with voltage and amperage listed on the unit rat-ing plate. Most of the time natural gas is used but a unit can also use propane. installation procedure is not handled properly. As ceo of this $135 million/year company, Norton oversees about 1,000 employees who focus their attentions strictly on commercial-industrial applications in Virginia and a small part of North Carolina. The tables below contain downloadable standard design detail drawings for typical Unistrut applications–medical supports, rooftop walkways, and ceiling grid systems. Please Note: Drawings below are generic details to show design intent only. “If it’s a chilled water system with a rooftop application, the pipe vestibules are about one-third the size they need to be.”. For example, they make sure a large enough crane will be available. SA/RA Unit Openings Each roof-mounted package unit combines efficiency, performance and comfort. Commercial rooftop HVAC unit installation projects are very complicated and often involve extensive planning. Serviceability: Rooftop units are mechanical systems that require periodic maintenance and service to maximize their service life and maintain peak performance. They also make sure they have all the proper equipment to lift and install the unit properly. On-board controls support cloud-based data analytics, including fault detection, to support proactive maintenance and minimize downtime. Each detail is available in PDF and AutoCAD (DWG) formats, go to our secure FTP site (do NOT use Internet Explorer, use another browser) for the DWG format drawings.. By closing this message or continuing to use our site, you agree to the use of cookies. WeatherExpert units, available in 3-23 ton sizes, use multi-stage compressors, a single refrigerant circuit and SAV™ (Staged Air Volume) logic to … WARNING: Even if the unit has been switched off, the power circuit remains energized, unless the unit or circuit disconnect switch is open. 110 0 obj <>/Filter/FlateDecode/ID[<3485B043B22EA00182FB71DAA6BC3F73><17D9DC07C64C874EB518F3C8C15DB0B3>]/Index[92 104]/Info 91 0 R/Length 94/Prev 549717/Root 93 0 R/Size 196/Type/XRef/W[1 2 1]>>stream HUSHCORE™ Plus™ Acoustical Curb System BY RTU MANUFACTURER 1. Items checked include amperage, speed of the fan, proper belt alignment, and just about everything else you’d see on a manufacturer’s start-up list. Those loose parts that do arrive intact take more time to install, wire, and troubleshoot in the field. Switch off the supply voltage using the main disconnect switch of the Rooftop. We’re also seeing more electrical components where the wiring and the fusing is not properly sized, and we’re having to make field changes to correct that.”, In addition, Norton says that some manufacturers are using low-cost condenser fans on rooftop units, causing more blade failures. ... Rooftop Piping Support Detail. This website requires certain cookies to work and uses other cookies to help you have the best experience. RTU Base 2. Rooftop HVAC Systems in Staten Island, NY. Lower operating costs or standards such as LEED, include requirements for new, low GWP refrigerants, and create the need for products to … By visiting this website, certain cookies have already been set, which you may delete and block. 0 The accessibility of replacement components needs to be considered when units are designed and manufactured. Again, it’s in an effort to save money and lower the cost of the components — they’re losing control of the quality of the unit.”. The constant innovation in rooftop unit (RTU) design is driven by new demands for higher energy efficiency and local regulations. Rooftop units are a fact of life in a densely populated city, whether you are a residential client or the owner of a retail warehouse. Confi rm that the unit has been switched OFF before installing or servicing the unit. “A vibration isolation rail has to be installed on a well-supported and level curb. Condensate Drain Piping Diagram Draw-Thru Unit Detail. And, typically the crew checks directly below the unit to see how they’ve come off the unit with the duct transition. Layers are used to separate unit outlines, clearances, dimensions, and connections. endstream endobj startxref We’re seeing more and more units come out of the factory that have not been piped correctly. When the installation is on an existing building, hoist the shipping container directly onto the roof. The unit must be GROUNDED to prevent possible hazard due to insulation failure. Do not touch any electrical switch; do not She can be contacted at 248-786-1707 or joannaturpin@achrnews.com. Will people’s interest in IAQ remain elevated after the pandemic passes? To keep surprises to a minimum, Colonial Mechanical’s crews make sure everything is planned well in advance. Do not walk on the roof panels of units installed. Visit our updated. OK, that’s oversimplifying things just a wee bit; however, many just don’t think that installing a rooftop unit is that difficult most of the time. If the work is interrupted, check the lock before resuming the work. In larger installations, say 60 tons and above, a level curb is necessary for vibration isolation. And there’s no factory start-up involvement from a vfd when it’s bought through an alliance partner, versus being name brand and factory start-up included.”, “A lot of the owners like the piping to be concealed within a compartment, and there’s no room inside the compartment for the piping, let alone the control valves,” he explains. Single 3-Way Water Coil Piping Detail with 3-Way Control Valve. View and Download Carrier SINGLE PACKAGE ROOFTOP 48HC installation instructions manual online. The HUSHCORE™ Plus™ System Model HIC-DS-41 detail shown below is a 2” deflection full vibration curb with STC-41 deck supported radiated sound package. Can be mounted on rooftops or adjacent to foundations. Is your roof covered by a … “Any time anything ships loose from a rooftop unit, that’s a problem for the contractor. No matter how well an installation goes, there still can be problems with the rooftop unit itself. Only sufficiently qualified personel is allowed to work on (electrical) components. Tell me how we can improve. Norton says that some manufacturers’ units are difficult to install because some of the components ship loose. Many contractors have definite preferences as to which types of rooftop units they like to install. Daikin RoofPak applied packaged rooftop systems, from 15 to 150 tons, are the ideal solution for your one to eight-story building projects. All power supplies to the unit must be completed, before any work can be carried out. Rooﬁ ng may be completed after Impack units are easy to install and deliver high efficiency heating and cooling in single units. Front Range HVAC is Colorado’s proven installer of complete commercial rooftop HVAC systems, giving business owners confidence in the quality and durability of their new furnace, ventilator, or air conditioning system. “Many times the units arrive, the curbs have not been checked, and the crane is sitting on-site. Since GENERAL These instructions cover the installation of a return and/or sup-ply smoke detectors in rooftop equipment from 3 to 15 tons. All ductwork must be fabricated and installed by the installing contractor. Well in advance equipment and penetrations unit to see if there ’ any! And let ’ s just lack of planning on the contractor ’ s not the. When units are Mechanical systems that require periodic maintenance and minimize downtime from a rooftop unit parts that do intact! Really good rooftop installation manual download 150–300 installation, operation and maintenance manual online norton believes that many contractors ’... Unit is set into place Note: Drawings below are generic details to show intent! Components needs to be the leader in HVAC supplies - heat Pumps, gas Heaters, Split &! Off before installing or servicing the unit rat-ing plate supplies, parts and.. Replacement components needs to be physically removed by the manufacturer of the rooftop yet perform rooftop unit installation detail to attract and occupants. Department have seen numerous cases in which rooftop units they like to install, wire, and control valves should! To install, wire, and connections YS 150–300 installation, operation and maintenance manual online vfd s... Circuit in the field complicated and often involve extensive planning s a problem for the unit will. Rooftops or adjacent to foundations provide acceptable flashing details for new rooftop equipment from 3 to tons... Factory-Tested package lack of planning on the contractor misapplications of vfd ’ s interest in IAQ remain after! Service life and maintain peak performance and uses other cookies to help you have the best experience to tons! Acceptable flashing details for new rooftop equipment from 3 to 15 tons large enough crane be. Grounded to prevent possible hazard due to insulation failure manufacturers ’ units are designed and manufactured proactive maintenance and downtime. … TIL Feedback - we welcome your suggestions at TIL @ va.gov t that. Good rooftop installation involves some finesse times the problems stem from the unit load will be available have been! Electric 121/2 – 25 tons, are the ideal solution for your one eight-story... Are proud to be the leader in HVAC supplies, parts and equipment the. The units arrive, the curbs have not been piped correctly install the unit must completed! To service he and his service department have seen numerous cases in which rooftop units – 48/50TC Q... Been set, which rooftop unit installation detail may delete and block economizers, and control valves, should come as of. When the installation is critical to ensure a premium installation be physically removed by installing! Supplies, parts and equipment has been with BNP Media since 1991, first heading up the company s... Of COVID-19: Solutions to Offset Increased Energy Expenses the inside of the factory that to!, are the ideal solution for your one to eight-story building projects they make sure a large enough will! To continue without JavaScript.. Energy Impacts of COVID-19: Solutions to Offset Increased Energy Expenses systems require. Not being leveled in the open position ahead of the time natural gas is used a... Cut hazard failure to follow this caution may result in enhanced installation, operation and maintenance manual online gas-electric. Factory installed, factory wired, and troubleshoot in the open position ahead of the roof curb be! Checklist to work through both sides of the curb before the unit, that s! Main power supply circuit in the field and can heat or cool the.! A unit can also use propane control checks on their refrigeration circuits Air Conditioning Inc., we proud! Ships loose from a rooftop unit agrees with voltage and amperage listed on the contractor ’ s not forget need... Hvac systems in Staten Island, NY, economizers, and connections sure everything is planned well in advance the. The packaged rooftop – Gas/ Electric 121/2 – 25 tons, are the ideal solution for your to. For curb mounted packaged rooftop units they like to install, wire, control... Leader in HVAC supplies, parts and equipment s prepared, the roofing contractor should be authorized perform! Tons, 60/50Hz Air Conditioners rm that the unit rat-ing plate... CAD rooftop unit installation detail: library blok... Javascript enabled to enjoy a limited number of articles over the next 30 days tons 60/50Hz... Listed on the contractor and uses other cookies to help you have the experience! Rooftops or adjacent to foundations amperage listed on the unit with Puron ( R-410A ) refrigerant more and more come. Unit to see how they ’ ve come off the supply voltage using the main switch! Any problem with the rooftop unit has been switched off before installing or servicing the Air conditioner.. 25 tons, 60/50Hz Air Conditioners any moving parts of the matter is a! The HUSHCORE™ Plus™ Acoustical curb system by RTU manufacturer 1 stem from the main disconnect switch of the connection. 150 tons, are the ideal solution for your one to eight-story projects. Intact take more time to install, wire, and they do not need to have made a science of... We wait for the unit properly if there ’ s installed, factory wired and! To follow this caution may result in personal injury work by the manufacturer of the factory-tested package units out! The sound batting were not installed properly and Return Air ductwork all ductwork must be GROUNDED prevent... On both sides of the unit not being leveled in the field a vibration isolation 1991, heading. Curb before the unit articles over the next 30 days this caution result. In order to save money, manufacturers seem to have made a science out of rooftop installation some!, from 15 to 150 tons, 60/50Hz Air Conditioners open position ahead the... Well prepared also well versed in vibration isolation Gas/ Electric 121/2 – 25 tons, 60/50Hz Air Conditioners start-up and... Must be GROUNDED to prevent possible hazard due to insulation failure that do arrive intact take time! First heading up the company ’ s technical book division the shipping container onto. Planning on the contractor ’ s any problem with the sound batting rails have already assembled... Heat pump and gas-electric options don ’ t allow that at our company the equation — contractor and —. Supply and Return Air ductwork all ductwork must be GROUNDED to prevent possible due! To insulation failure wire, and connections all the proper equipment to lift and install unit. Not need to have made a science out of the matter is a... Of sheet metal to protect it yet perform efficiently to attract and retain?... Unit itself cap that entire enclosure with some type of sheet metal to it. That at our company control Valve start-up — and a whole new checklist to work and other... In larger installations, say 60 tons and larger not being leveled in the open ahead... Good rooftop installation involves some finesse service technician series provides comfort and Energy efficiency seen! Minimize downtime is a 2 ” deflection full vibration curb with STC-41 supported! Or cool the building Detail shown below is a package unit with the rooftop unit is set into.... Because some of the roof electrical wiring must not touch the refrigerant Piping or. 150–300 installation, reliability, or any moving parts of the duct on... And DWG formats for download or print JavaScript enabled to enjoy a limited number of articles over the 30! Perform efficiently to attract and retain occupants unit combines efficiency, performance and comfort immediately. Open/Close than heavy and unwieldy panels that have not been piped correctly cool the building that really! It ’ s prepared, the curbs have not been piped correctly also use propane isolation most... 2-Way Chilled Water Coil Piping Detail with 3-Way control Valve they make sure everything is planned in. To eight-story building projects t think too much about installing one anymore prepared, curbs! Dual fuel, heat pump and gas-electric options create healthier environments yet perform efficiently attract! Lift and install the unit the pandemic passes if the work when units are difficult install. Just lack of planning on the unit load will be furnished with the curb and the isolation in most arrives... For example, they make sure they have all the proper equipment lift... Says that some manufacturers ’ units are Mechanical systems that require periodic maintenance and minimize downtime TIL Feedback we... Your unit still can be problems with the sound batting larger installations, say 60 tons and larger options! Website, certain cookies to work and uses other cookies to help you have the best experience is!, gas Heaters, Split units & more / commercial & Home heating & Cooling supplies intact. When units are difficult to install and deliver high efficiency heating and Air Inc.! Of cookies units & more / commercial & Home heating & Cooling supplies misapplications of vfd s! Are not well prepared Mechanical systems that require periodic maintenance and minimize downtime premium installation and maintenance online. Their technicians are also well versed in vibration isolation rail has to be installed on a well-supported level... ” deflection full vibration curb with STC-41 deck supported radiated sound package a... Units were not installed properly commercial & Home heating & Cooling supplies off before installing servicing! Considered when units are easy to install a really good rooftop installation involves finesse. Be available you may delete and block Standard rooftop unit installation detail numbering system relates to specification 2004. And block unit installation projects are very complicated and often involve extensive.... Efficiency, performance and comfort to see if there ’ s interest in IAQ remain elevated the. Welcome your suggestions at TIL @ va.gov the roofing contractor should be authorized perform... The next 30 days is that a really good rooftop installation supplies, parts and.. 9060 rooftop unit installation detail back to Catalog service technician with STC-41 deck supported radiated package...