#: locale=en ## Action ### PDF PopupPDFBehaviour_8850B127_CE7B_FAAE_41E1_93D34B8400CB.url = files/AEP%202023%20Agenda%20(1)_en.pdf PopupPDFBehaviour_E0A234AC_CAFA_DBA2_4189_2C6CED56F0A8.url = files/AEP%202023%20Welcome_en.pdf PopupPDFBehaviour_D0AF4D80_F5B7_FCEA_41B8_F53EDAA4A439.url = files/AEP%20Leadership%20-%20Getting%20to%20Know%20You_en.pdf PopupPDFBehaviour_8CFCB5E8_CE6A_E5A3_41D5_8B8A18004E61.url = files/Conferece%20Center%20M%20Set_en.pdf PopupPDFBehaviour_D321E4F2_F5AC_CC29_4191_B7F4BFE21186.url = files/Instructors%20-%20AEP%20Dallas_en.pdf PopupPDFBehaviour_8E953B3D_CE6B_6EA2_41CB_E50BB3DDF55D.url = files/Sheraton%20Dallas%20Vertical%20Map_en.pdf ### URL WebFrame_9FDFFBFD_FC9C_C253_41E5_6EF0419FF017.url = https://av8rdas.wordpress.com/2013/02/15/pneumatic-controls-first-cost-advantages-and-retrocommissioning-opportunities/ LinkBehaviour_09420D62_1DC4_3711_41BC_6DDEB03F45A9.source = https://av8rdas.wordpress.com/2015/09/22/economizersthe-physics-of-a-mixed-air-plenum/ LinkBehaviour_816052B8_AADA_3F43_41A5_DB6F56661C82.source = https://av8rdas.wordpress.com/author/av8rdas/ WebFrame_22F9EEFF_0C1A_2293_4165_411D4444EFEA.url = https://maps.google.com/maps?output=embed¢er=32.7849567,-96.7945892&z=15&q=Sheraton+Dallas+Hotel LinkBehaviour_8871CBFA_CE79_ADA7_41CC_877956307BCA.source = https://marriottonline.sharepoint.com/:f:/r/sites/AEP2023/Shared%20Documents/General/Training/Video%20recordings?csf=1&web=1&e=oYlHeX LinkBehaviour_D1D56B19_F5AF_441A_41E3_0A1F5E8A73EF.source = https://marriottonline.sharepoint.com/:p:/r/sites/AEP2023/Shared%20Documents/General/Getting%20to%20know%20you/MAIN%20Getting%20to%20know%20you.pptx?d=wb6d1d2bfc767445eb43bdc71dfaa28ed&csf=1&web=1&e=JNkcgA LinkBehaviour_D6DECB58_F5EB_C419_41CE_480F64769FD5.source = https://marriottonline.sharepoint.com/sites/AEP2023/Shared%20Documents/Forms/AllItems.aspx?csf=1&web=1&e=oYlHeX&cid=c7d446b0%2D4eb1%2D4f7f%2Db918%2D99635e0f9268&FolderCTID=0x012000EADB80E9E35C9B4C83873DA2A1E1622C&id=%2Fsites%2FAEP2023%2FShared%20Documents%2FGeneral%2FResources%20%26%20Templates&viewid=373591e6%2Da31c%2D4a5f%2D8b7d%2Da9e3b862697e LinkBehaviour_D6EB6B4B_F5F5_447F_41E6_86C889C027B3.source = https://marriottonline.sharepoint.com/sites/AEP2023/Shared%20Documents/General/Resources%20&%20Templates/Current%20Energy%20ROI%20Package%20Requirements.pdf?CT=1692037761358&OR=ItemsView LinkBehaviour_D6F9F7E9_F5EF_CC3B_41B8_72F2C7753E73.source = https://storage.net-fs.com/hosting/7840328/4/ LinkBehaviour_94462336_FFF5_43D0_41D3_B4C584D2E594.source = https://storage.net-fs.com/hosting/7840328/6/ LinkBehaviour_8BF06521_CE7B_BAA2_41BA_D12D545D25DB.source = https://www.av8rdas.com/ WebFrame_22F9EEFF_0C1A_2293_4165_411D4444EFEA_mobile.url = https://www.google.com/maps/embed?pb=!1m18!1m12!1m3!1d14377.55330038866!2d-73.99492968084243!3d40.75084469078082!2m3!1f0!2f0!3f0!3m2!1i1024!2i768!4f13.1!3m3!1m2!1s0x89c259a9f775f259%3A0x999668d0d7c3fd7d!2s400+5th+Ave%2C+New+York%2C+NY+10018!5e0!3m2!1ses!2sus!4v1467271743182" width="600" height="450" frameborder="0" style="border:0" allowfullscreen> LinkBehaviour_E33919F3_CAF9_ADA5_41E2_997A1B643ABC.source = https://www.surveymonkey.com/r/9B5N7NF LinkBehaviour_092E80CC_1DC4_2D11_4197_3F93AC45E74F.source = //www.youtube.com/embed/3P_kC5aKbxY?v=3P_kC5aKbxY LinkBehaviour_E0CBA43F_CAFE_BA9E_41CF_CE26036304F0.source = mailto: Agila.Kumar@marriott.com; sue.redding@marriott.com ## E-Learning ### Answer questionOption_FF1691D4_D04E_1B87_41E7_4E2D03107763.text = A DDC device that supports scheduling, alarms, and trending questionOption_FD8419C3_D04E_2B80_41E0_0EFC4893F185.text = Device is interoperable with other BACnet devices, even if not Distech questionOption_FCCAB5DE_D04E_7B80_41E5_1C3AA866CAAF.text = Disconnected inputs are likley duct static pressure signals and the fan must be overriden to operable questionOption_FE1D6DED_D04F_EB81_41C9_B45C405D5DA9.text = LCD display for point override is available from manufacturer but not equipped here questionOption_A31A940F_FC9B_C5CF_41CA_8DB9D9FFC55B.text = No questionOption_A42136DB_FD7D_4250_41E1_989328F49165.text = No questionOption_9FE147C3_FC95_42B7_41EB_A3FCDDB453C0.text = No questionOption_BA528B5B_F495_441E_41E6_838DD99D8A31.text = No questionOption_BD8AF00A_F495_43F9_41E8_9A08429E2C22.text = No questionOption_B97AA039_F4ED_441A_41EE_3A0C070FCE52.text = No questionOption_8FE32D0D_FFF5_C7B0_41E9_9D9D5E5B575E.text = No questionOption_B0F8A923_F4B7_C42E_41EA_00B654800A62.text = No questionOption_AD119C9F_F4BC_BC17_41D3_3E5F4CB5CD42.text = No questionOption_91165F3B_FC95_43D0_41E8_BA170DF20C99.text = No questionOption_9028C941_FCAD_CFB0_41EC_37102DAD3B86.text = No questionOption_899B92C7_FD6C_C2BF_41C9_1DF457AF5750.text = No questionOption_FC447624_D04E_F880_41E3_9B8CD7E6542D.text = Some hardwired connections have been unplugged but are likely not needed questionOption_FDAB8BFB_D04A_6F81_41D2_B23AFA41CAC8.text = The zone-level subnet is unused questionOption_95EB216B_FFB4_DE70_41EC_4BD4D07B4FE3.text = There is a low amount of additonal hardware input/out available for new equipment or RCx measures questionOption_91C2B5EB_FC95_4670_41D7_2EB51A1ABF58.text = Yes questionOption_BD813007_F495_43F7_41D9_9517373ADA77.text = Yes questionOption_A382D7DB_FC9B_4250_41AF_7A150147EAF4.text = Yes questionOption_96243E97_FD6C_C2D0_41E1_C8F00F140554.text = Yes questionOption_BBE6BAF9_F4B7_441A_41E9_8AA64CE387DD.text = Yes questionOption_BA6EF7D7_F495_4C17_41E2_8591E7CF5DB0.text = Yes questionOption_B94C302B_F4ED_443E_41CF_BEA0EDF0D639.text = Yes questionOption_A5BF78D9_FD7D_4E53_41EE_C18F9BC4B46A.text = Yes questionOption_8F5C0992_FFF5_4ED0_41E2_4E808349A706.text = Yes questionOption_9FA75719_FC95_C3D0_41C1_50CFF6A48DD9.text = Yes questionOption_9070DD71_FCAD_C650_41EB_63AE4E50CCDA.text = Yes questionOption_AD498E62_F4BC_DC29_41ED_458F84B53743.text = Yes questionOption_82B62062_C5E9_B576_41C2_4C59496FFB6B.text = a Distech brand device, but really a Niagara Framework platform that I can get from most controls vendors questionOption_81576A70_C5EB_D552_41E6_4031B148AA7F.text = a Supervisory controller that I can connect to with my computer and look at graphic or download trends questionOption_82AC5F15_C5E9_ACD2_41D2_D2D116E555C0.text = a protocol router that looks to be connected through ethernet cable to a controls front-end somewhere questionOption_810FA5E5_C5EF_DF72_41D5_77FD4ABB28ED.text = a way to standardize BACnet or LonWorks field controls questionOption_8278BFF3_C5E9_6B56_41E1_A1D37AC8B39A.text = an IT router that just sends signals somewhere ### Question question_B94DF02B_F4ED_443E_41D6_0793EA0F29D1.title = Do you want to climb up and enter the outside air plenum? question_BB8F03C7_F495_C477_41CF_E72FA6A1ECD6.title = Do you want to enter the mixed air plenum? question_918149A4_FCAD_4EF0_41E6_E162D58626D3.title = Do you want to learn about what's inside this controls cabinet? question_9CC01ECE_FC95_C2B0_41E2_E064E31BA9B7.title = Do you want to open this panel? question_AEC6CC23_F4BD_5C2F_41D3_EA009C6D7E04.title = Do you want to open this panel? question_9E7DDBE1_FC94_C270_41E1_9B5D7F8BBD3A.title = Do you want to open this panel? question_BD81F007_F495_43F7_41D0_2FA29CD7CD39.title = Do you want to open this panel? question_BEDEBD70_F4B5_7C2A_41C6_B43322ACF83D.title = Do you want to open this panel? question_952A6EBB_FD6B_42D0_4199_CA330AA4BDE4.title = Is it worth grabbing the ladder right here to see what's on top of this sheet metal box? question_82A6FBDB_C5E9_6B56_41DE_9C273A3B50A7.title = Looking through the product manual as needed, what would you call this device? (select all that apply): question_9988B1CD_FD7D_FEB0_41D4_CAE36BC1C17D.title = This looks like a pneumatic damper actuator for outside air. It's good to carefully test these in the field for functionality. Would you like to test this actuator by temporarily removing the main control air tubing off the actuator? question_A6854D1B_FC9D_47D0_41B6_6349BCBAAE51.title = This looks like an outside air damper trying to control for some rough minimum outdoor air amount (no air flow monitoring instrumentation seen anywhere). This one has an extra spring-based component called a positive positioner that sits in-between the control signal and the actuator. These devices can help make the actautor more quick-acting or account for differences in what the pneumatic actuator psi ranges was designed for. Do you think it's okay to see if the damper works by testing the spring plate? question_FD522820_D04A_2880_41C9_99CEA79E3946.title = Which of the following statements appear true for these field controller devices? (select all that apply) question_8AC0F953_FFFB_4E50_41DC_7E3DD4CB52DC.title = Would you like to exit this AHU-9 training exercise and start go to the boiler room virtual pump test? ### Question Screen quizQuestion_9F476E61_DE6E_AD72_41D3_62861C0D1D88.ok = OK ### Report Screen quizScore_9F457E61_DE6E_AD72_41E2_AB5E4327E32B.title = - SCORE - quizScore_9F457E61_DE6E_AD72_41E2_AB5E4327E32B.completion = Completed quizScore_9F457E61_DE6E_AD72_41E2_AB5E4327E32B.questionsCorrect = Correct quizScore_9F457E61_DE6E_AD72_41E2_AB5E4327E32B.downloadCSV = Download .csv quizScore_9F457E61_DE6E_AD72_41E2_AB5E4327E32B.description = Great job finding these key pieces of equipment! quizScore_9F457E61_DE6E_AD72_41E2_AB5E4327E32B.questionsIncorrect = Incorrect quizScore_9F457E61_DE6E_AD72_41E2_AB5E4327E32B.items = Items Found quizScore_9F457E61_DE6E_AD72_41E2_AB5E4327E32B.questions = Questions quizScore_9F457E61_DE6E_AD72_41E2_AB5E4327E32B.repeat = Repeat quizScore_9F457E61_DE6E_AD72_41E2_AB5E4327E32B.submitToLMS = Submit quizScore_9F457E61_DE6E_AD72_41E2_AB5E4327E32B.elapsedTime = Time ### Score Name score4.label = DDC Devices score3.label = Electric Components score1.label = Local Controls score2.label = Pneumatic Components ### Timeout Screen quizTimeout_9F461E61_DE6E_AD72_41DD_EB1763D0879B.title = - TIMEOUT - quizTimeout_9F461E61_DE6E_AD72_41DD_EB1763D0879B.repeat = Repeat quizTimeout_9F461E61_DE6E_AD72_41DD_EB1763D0879B.score = View Score ## Hotspot ### Text HotspotPanoramaOverlayTextImage_0921DB36_1DC4_F371_419B_F379055F7F18.text = \ \ \ \ \ \ \ RCxU \ Vid \ HotspotPanoramaOverlayTextImage_094D1E62_1DC4_3510_41B5_D3F6BC3C24DD.text = \ \ \ \ \ \ \ David's \ Blog \ HotspotPanoramaOverlayTextImage_08F6AD71_1DDC_37F3_41B5_7F86E0C5A16F.text = \ \ \ \ \ \ Psych \ Chart \ \ HotspotPanoramaOverlayTextImage_06F6D26F_1EC4_2D10_41BD_457CB4B79FD9.text = DDC, or Direct Digital Controls, are the brains of any modern commercial building. DDC devices like these execute sequences of operation based on their hardwired input/output connections and how they've been configured. Plant and especially zone-level DDC open up many options to reconfigure these sequences to include automated measures for ramping down equipment during lower load conditions. These measures can include setpoint resets, equipment-level schedules, demand-based ventilation, standby operations, and others. \ A true Building Automation System connects the building's DDC using some open protocol like BACnet and includes a monitoring and control front-end. These vendor-specific front-end systems have tremendous power to view, schedule, trend, and alarm our systems for enhanced facilities management. But whether we're procuring or operating these systems, it is critical to have an understanding of how the overall system is put together and what loads & processes it sees. HotspotPanoramaOverlayTextImage_97ED44EE_FF7D_4671_41E4_95F2D762CEE5.text = 1 HotspotPanoramaOverlayTextImage_93AEA266_FF7C_C270_41D9_2A7A101DDC39.text = 2 HotspotPanoramaOverlayTextImage_07E9EF96_1ECD_F330_4194_C7EBE0756CAC.text = Back to the \ AHU-9 controls tour \ after completing the DDC quiz HotspotPanoramaOverlayTextImage_0648014F_1E4C_2F2F_41A1_FB8F6C79D162.text = Click here to start the DDC quiz HotspotPanoramaOverlayTextImage_9DD9F8F2_FF74_CE50_41EB_247CF38209A2.text = Download the product data and use as needed to answer questions about these two important devices in this controls cabinet HotspotPanoramaOverlayTextImage_0EF2A900_1DDC_3F10_419A_82D982AF0420.text = Exit to the Central Plant HotspotPanoramaOverlayTextImage_0E768950_1DC5_FF30_41AB_0C00420950A2.text = Resouces that may help with this lesson HotspotPanoramaOverlayTextImage_09B3E9BE_1ECC_5F70_41B3_E7E526E5E7AC.text = Welcome to the DDC lecture ### Tooltip HotspotPanoramaOverlayArea_A07D5FC2_FB77_FC69_41C0_88AFD32979DD.toolTip = Get closer to take a look inside these cabinets HotspotPanoramaOverlayArea_DAAF5D61_F57C_BC2B_41D8_59E640DA7E8D.toolTip = Here's a clue on what you're chilled water coil is up to HotspotPanoramaOverlayArea_CB0BC2BC_F495_C41A_41E2_CFDC8A75825C.toolTip = There's alot here, try to get a better view HotspotPanoramaOverlayArea_C570AB13_F57D_45EE_41C7_3660D37012D7.toolTip = These look important! Navigate closer to get a better look HotspotPanoramaOverlayArea_9B729A59_FCB7_4250_41E1_AFDFDC492B8A.toolTip = These look important! Navigate closer to get a better look HotspotPanoramaOverlayArea_A2A88C31_F4AC_DC2A_41EC_66FA63790DCA.toolTip = This is just a junction box HotspotPanoramaOverlayArea_DADAB943_F574_C46E_41C9_E89E7DFBD81C.toolTip = This looks like a Sound Trap, you can check the plans to confirm HotspotPanoramaOverlayArea_CB21A36E_F4AD_C436_41C2_5AC23616FACB.toolTip = This looks like a Sound Trap, you can check the plans to confirm HotspotPanoramaOverlayArea_DA6195D4_F56D_4C69_41E1_363D9137458D.toolTip = This looks like a Sound Trap, you can check the plans to confirm HotspotPanoramaOverlayArea_A5F325CF_F4F7_4C76_41D7_27920C00950D.toolTip = This looks like an abandoned temperature gauge port for a locally read duct thermometer HotspotPanoramaOverlayArea_BBCEB04B_F4F5_447F_41E2_9A7A6C363446.toolTip = This panel of fixed blades is an air blender, but may not necessarily be doing a good job despite the name HotspotPanoramaOverlayArea_DAF720D7_F594_C417_41E7_A92A48E4848E.toolTip = Try to get a better view of this device HotspotPanoramaOverlayArea_C597A27D_F56B_C41B_41E8_439A59F46AB7.toolTip = Using the electrical disconnect to deenergize the supply fan may result in BAS alarms HotspotPanoramaOverlayArea_DAC51701_F56D_CDEA_41ED_ECB279F4FEF1.toolTip = What's this? Try to get a better view HotspotPanoramaOverlayArea_DA26FE4F_F577_5C77_41A5_5D1B7461ABFD.toolTip = Where does this go? Click to find out ## Media ### Audio audiores_989602F2_FDAB_4250_41D1_D8ACD9E61803.mp3Url = media/audio_994AF1CC_FD7D_5EB0_41D8_495042C8A482_en.mp3 audiores_95E69F9F_FFED_C2D0_41AD_CF92DCD33B64.mp3Url = media/audio_99A81C4B_FD7F_C5B6_41EF_29344C2F475F_en.mp3 audiores_95F4DB89_FFED_C2B0_41E6_D07C7275EF9F.mp3Url = media/audio_99B0CACD_FD7D_C2B0_41EB_EDEF9FA1543B_en.mp3 audiores_98AC317D_FDAB_7E50_41DB_CFFDD4C6DE3A.mp3Url = media/audio_A7177386_FD6D_C2B0_41EC_023FC9DB08FD_en.mp3 audiores_A2576918_F4AD_441A_41ED_81A56D441900.mp3Url = media/audio_B020CF97_F56B_DC16_41C3_666AFD12AE44_en.mp3 audiores_A2549879_F4AD_441B_41CD_A543ACA5896F.mp3Url = media/audio_BDB8563A_F56F_4C1E_41BE_0CEA4FEE8A67_en.mp3 audiores_A22FA0BF_F4AD_4416_41DB_CA915429DD67.mp3Url = media/audio_BE9B66F4_F4AC_CC2A_41E5_303F54B72028_en.mp3 audiores_A223CCF4_F4AD_7C29_41AA_5CFB19617E44.mp3Url = media/audio_BF1B31A8_F49B_C43A_41EA_135A35A0C452_en.mp3 audiores_B75932D1_F76C_C46A_41DD_CA3D39567111.mp3Url = 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Junction box
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This is an inclined manometer. From the location, we can assume this device is providing a visual display of differential pressure drop across the filter section of this AHU. While not providing any local control, these devices can be helpful to verify whether air filters are in need of changing.
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This is likley a high pressure switch at the discharge of the air handler's supply fan. These devices sometimes provide an input signal to the control system, but always disable the fan on its motor safety circuit when discharge pressure exceeds th device's local setting.
These devices should be tested before implementing conservation measures like duct static pressure setpoint reset or zone scheduling, for more air-side issues and opportunities watch the video at right:
htmlText_DC10D386_CFFE_7F80_41DC_0BED374A3B00.html =
This looks like a CO2 sensor connected to the control system. Is this monitoring only or is driving some reset of outside air requirements? We'll need to check in the control system to evaluate sequences and calibration issues. Equally important, we will want to build our air-side system diagram to consider if this return air may be combined from multiple units.
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You found AHU-9's Supply Fan VFD! These variable frequency drives are critical control system devices, as they allow air handler fans to ramp down in low load conditions for affinity law energy savings. Make sure to note if these devices in are manual override, or "Hand", mode and always discuss with O&M before switching back to "Auto". Why would this one show a command of 0% but a status near full speed?
htmlText_866E7A89_C5DE_D5B2_41E7_E541AC3CEE9D.html =
Answer the following questions on the control cabinet you've found in this mechanical room (close this window to continue)
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Be very carful here, this doesn't look like a stable place for a ladder. There likley isn't much interesting in here since we don't see a outdoor air probe and outdoor air dampers likley aren't visible.
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Careful, this is the supply side of AHU-9. We don't know how the supply fan is ducted here, and it's possible this panel is directly in the discharge of the fan. Always be aware of how pressurized sections of an air handling unit may make it unsafe to enter while the fans are running. There's also a pinch/snag hazard with the supply fan, belt, and pulley that are likely rotating at a few thousand RPM just inside this panel.
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Careful, this looks like a supply duct going out to the space, there is likely something like a combination fire/smoke damper just downstream of this panel. As part of finding the controls, we can leave this panel alone so we don't disturb any fusible links or other damper components just underneath here.
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DPS-1 probably means differential pressure switch. There are always two measurement ports for a pressure switch like this, one here is open to the mechanical room and the other looks to be measuring mixed air plenum pressure. Since the mixed air plenum is on the suction side of the supply fan and would be negatively pressurized, this switch likely cuts off the unit as part of the fan safety circuit if the plenum goes too negative. What could cause something like that??
htmlText_A6B01304_FD6D_43B1_41C5_B5835B9A6A9F.html =
Good call! There may be some strain on the damper components from a sudden change in main control air, but more damaging may be what could happen if the economizer goes too negative in pressure. Since most outside air dampers are designed to fail closed for coil freeze protection, removing the control air may immediately shut this damper. With return air dampers also closed, the rapid negative pressure may permanently damage unit seals or even damper blades. You may find a low pressure safety swtich to protect against this kind of damage, but there are better ways to testing things. The best way to test the dampers like these is through the control system whenever possible.
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Good call, it's important to understand how these transfers bring air from the return plenum below. Since AHU-9 pulls from the same plenum for it's ducted return, this transfer and any local controls like the floor penetration fire damper is really part of the overall AHU-9 air-side system.
htmlText_BD8A300B_F495_43FF_41E8_A36933B37C7A.html =
Good call, this is the supply side of AHU-9. We don't know how the supply fan is ducted here, and it's possible this panel is directly in the discharge of the fan. Always be aware of how pressurized sections of an air handling unit may make it unsafe to enter while the fans are running. There's also a pinch/snag hazard with the supply fan, belt, and pulley that are likely rotating at a few thousand RPM just inside this panel..
htmlText_BD8B1E00_F4BB_5FEA_41DF_A9BD5D73052B.html =
Good call, this looks like a supply duct going out to the space, there is likely something like a combination fire/smoke damper just downstream of this panel. As part of finding the controls, we can leave this panel alone so we don't disturb any fusible links or other damper components just underneath here.
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Good job! You found a second duct static pressure sensor for AHU-9. Why do you think there is more than one duct static sensor for this unit? And why install them here so close to the unit discharge? Should the controls use the average reading, the maximum reading, or reset the duct static setpoint down from design in low load conditions?
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Good job, you found a duct static pressure sensor for AHU-9. This is supposed to be part of the control loop determining what speed the fan should be running at to maintain a duct static pressure setpoint. This suggest a VAV box zone configuration we'd have to confirm with the plans and spot zone checks. This sensor seems pretty close to the air handling unit, can you think of any issues or opportunities related to this sensor and its location or fixed setpoint?
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Here's a pneumatic actuator associated with the return air dampers. Having two damper actuators for a wider damper section like this may better protection against damper failure through binding, mount shear, or shaft slippage. Still, it's worth functionally testing to make sure these dampers are operable.
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If we follow this this supply trunk along this wall, we'll find it branches off and penetrates through this block wall and into the plenum space on its way to AHU-3 zones. We can see a combination fire/smoke damper, which can be considered part of AHU-9's local control system. With careful coordination, this damper could potentially be repurposed as a zone control damper and help provide zone-level scheduling for AHU-9. Equally interesting is that there is no duct static pressure sensor here, despite this being the longest run out of the mechanical room. What might be the effect of that?
htmlText_9025F4A5_FC95_C6F3_41E7_E0D86D9049D3.html =
In addition to the two transformers near the top of the panel, we can see some pneumatic controls infrastructure. These appear to be transducers given the combination low voltage electric wiring and pneumatic tubing on each device. These types of devices may also function as receivers that help tune pneumatic control loops. Either way, these are part of the overal control systems for AHU-9 (and nearby AHU-1).
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It's important to track down all major supply runs to understand AHU-9 as a whole system. See if you can get closer to this duct to see where it goes.
htmlText_9963A587_FD6B_46BF_41EE_FFA409C03A81.html =
It's important to understand how these transfers bring air from the return plenum below. Since AHU-9 pulls from the same plenum for it's ducted return, this transfer and any local controls like the floor penetration fire damper is really part of the overall AHU-9 air-side system.
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It's okay to slightly adjust the spring length by hand at the plate it's connected to as a quick test to make sure the damper isn't frozen or otherwise inoperable. You'll hear a slight pneumatic hissing as the damper actuator rod adjusts accordingly. Economizer dampers can fail in a number of ways and it's a good idea to check in the field whether the damper is doing something that makes sense with the operating conditions.
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It's okay to slightly adjust the spring length by hand at the plate it's connected to as a quick test to make sure the damper isn't frozen or otherwise inoperable. You'll hear a slight pneumatic hissing as the damper actuator rod adjusts accordingly. Economizer dampers can fail in a number of ways and it's a good idea to check in the field whether the damper is doing something that makes sense with the operating conditions.
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Junction box
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Junction box
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Junction box
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Looks like this panel has pneumatic-to-electric transducers that act as an interface between the digital (or DDC) controls and the older pneumatic actuators still in use at AHU-9. These seemed likely given that the panel has electric conduit coming in at the bottom and pnematic tubing coming out at the top. At some point, a value engineering decision may have been made to leave the damper actuators as pneumatic when the rest of the unit was converted to digital. The DDC looks to be sending three output signals to these three transducers but the transducers send control air to at least five devices shown in the top right . Electric damper actuators would not have automatically improved the operation of this unit, but it would have eliminated the need for this cabinet and its equipment.
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Not so fast! There may be some strain on the damper components from a sudden change in main control air, but more damaging may be what could happen if the economizer goes too negative in pressure. Since most outside air dampers are designed to fail closed for coil freeze protection, removing the control air may immediately shut this damper. With return air dampers also closed, the rapid negative pressure may permanently damage unit seals or even damper blades. Hopefully there is a low pressure safety switch on the suction side to disable AHU-9 before that happens. The best way to test dampers like these is through the control system whenever possible.
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That's okay, this isn't a great mixed air access panel and has some added tripped and head impact hazards. But if you're comfortable, these sections can be entered safely and assess for dirty filters, poor sensor placement, improperly functioning dampers, and other operational issues. When you're ready, come back and try entering through this panel.
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That's probably a good call, this doesn't look like a stable place for a ladder. There likley isn't much interesting in here since we don't see a outdoor air probe and outdoor air dampers likley aren't visible.
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There are many variations in DDC device capability, interoperability, interfaces, and capacity. Procure DDC devices with open technologies like BACnet or Niagara Framework, and specify all local and front-end display and override needs.
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There's always a risk to consider when opening an equipment panel to a possibly pressurized space and with fire/smoke dampers and sensors nearby. It's likely ok here, since this is lower pressure return duct just downstream of the sensor. Just be careful not to disturb this equipment or accidentally trip the sensor by drilling into ductwork in this area without checking with O&M.
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There's always a risk to consider when opening an equipment panel to a possibly pressurized space and with fire/smoke dampers and sensors nearby. It's likely ok here, since this is lower pressure return duct just downstream of the sensor. Just be careful not to disturb this equipment or accidentally trip the sensor by drilling into ductwork in this area without checking with O&M.
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These DDC devices can do a lot, and are kind of like a piece of the controls front-end situated at the field-level. Some supervisory controllers are proprietary, whereas others like these Niagara Framework (or JACE) devices are open and interchangeable. They can help get graphics, trends, alarms, and schedules setup for a system like AHU-9.
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This is a local freezestat that should be part of the fan cuttout safety circuit. A freezestat consists of a diaphragm that moves as the pressure inside a capillary tube changes with temperature, closing a switch at a specific temperature to shut down the flow of outside air when in an alarm state. This capillary tube, filled with refrigerant gas, is constructed from small-diameter, thin-walled metal tubing that is susceptible to kinking Freezestat must be installed correctly and may benefit from staged coil protection where outside air is disabled prior to seeing the lockout setting on this freezestat.
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This is a pneumatic return air damper actuator, see how it's inline with the return air duct? Based on the damper arm being so extended and the O&M marks, looks like this one is mostly if not full closed. Does that make sense for the weather conditions at the moment? We would expect return air dampers to go full open when the economizer is locked out above high or below low limits. The high limit is a function of climate and return conditions; the low limit is function of coil freeze protection.
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This looks like a combination fire/smoke damper. Be careful working in this area and shut the unit down if you need to get inside or drill through the ductwork here. But also realize that this damper infrastructure has potential to act as a zone damper we can control for any zone-level scheduling that may apply. We would have to coordinate with fire/safety folks for this use, but it may be beneficial to have the damper regularly stroked to ensure it is funtional and doesn't get stuck from low use.
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This looks like it could be important to understanding potential airflow paths for AHU-9 and controls implications, but there's no ladder to see what it looks like up here. Keep searching for a ladder nearby.
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This looks like part of the freezestat chilled water coil protection which would be included here as part of our local control of AHU-9, good find.
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This panel looks like it's functioning as a pull box and extra looping for the pneumatic tubing (black) and electric control signal wiring (white) associated with some of AHU-9's control components.
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This smoke alarm is part of the fire protection system. This one is located in the return air ductwork and in addition to sounding an alarm, would likely close fire/smoke dampers in and out of the space as well as disable AHU-9 through the supply fan motor safety circuit.
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This smoke alarm is part of the fire protection system. This one is located in the supply air ductwork and in addition to sounding an alarm, would likely close fire/smoke dampers in and out of the space as well as disable AHU-9 through the supply fan motor safety circuit.
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This was likley worth accessing, given the conduit connections to nearby control panels and no indications of higher voltage contents. In addition to the two lower voltage transformers near the top of the panel, we can see some pneumatic controls infrastructure. These appear to be transducers given the combination low voltage electric wiring and pneumatic tubing on each device. These types of devices may also function as receivers that help tune pneumatic control loops. Either way, these are part of the overal control systems for AHU-9 (and nearby AHU-1).
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We do have to be careful opening panels that may contain higher voltage, but there were signs here from the charger cable sticking out of the cabinet and plugged into the 120V outlet that this was not a higher voltage electrical distribution. In this panel we see where DDC controller hardwire input and output connection terminate onto this terminal strip where they ultiimately connect to the actual field sensor, actuator, transducer, or relay devices.
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We have to be careful opening panels that may contain higher voltage, but there were signs here from the charger cable sticking out of the cabinet and plugged into the 120V outlet that this was not a higher voltage electrical distribution. Here we see where DDC controller hardwire input and output connection terminate onto this terminal strip where they ultiimately connect to the actual field sensor, actuator, transducer, or relay devices.
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We would expect this newer sensor at the discharge of the fan section to be the supply temperature sensor. Inside the black box is low voltage wiring that connects the temperature probe and sending element to the digital (or DDC) control system that should be nearby. Remember that this sensor is part of the chilled water valve control loop, and if it's trying to maintain a design setpoint even during low load or unoccupied conditions then it could be putting extra load on our plant and possibly unnecessary extra reheat from our hot water system to keep the space thermostats from overcooling.
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You found is a coil valve actuator on the chilled water side. This should be controlled to maintain the supply air discharge temperature, however a reset on this supply air temp setpoint may be in place to conserve chilled water plant energy in part-load conditions. For more
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You found is a coil valve actuator on the hot water side. Being upstream of the chilled water coil, this hot water coil likley serves a pre-heat function for freeze protection in cold weather when the economizer is not functioning properly. These valves can fail or leak, however, and with coils this close together it doesn't look like a discharge air temp sensor was installated after the preheat coil. Be aware of unwanted but hidden preheat load that may be unnecessarly taxing your chilled water plant.
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You found relief dampers! These are barometric, or gravity, dampers rather motorized. You can see horitzontal weights on each damper blade that can be adjusted to exhaust air to the outside when the mechanical room gets to a certain overpressurization. What makes these dampers part of the AHU-9 systems, and under what circumstances would you expect these dampers to be open?
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You found the mixed air temperature sensor, good job. This could be a duct probe type or an averaging serpentine type. Think about the physics of a mixed air plenum and how stratification due to poor plenum configurations could skew what the control systems thinks it sees as mixed air. Taking a look inside the plenum may be helpful to see what mixed air sensor type is in use and if there's any reason to suspect a control issue or improvement opportunity,
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You found the return air temperature sensor. A duct probe like this uses changes in electrical resisitance (ohms) to give the control system an associated sensing element temperature. Calibration or replacement may be needed if an ice bath or ohm measurement suggests a faulty temperature reading may be improperly driving the economizer. Also be aware how changes in return temperature conditons may affect when the economizer should or should be locked out.
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You may have noticed this mixed air temperature sensor from the outside of the unit as well. This is a probe (rather than averaging type) sensor that is likley trying to control the outside and return dampers to maintain a fixed mixed air setpoint when ambient outside air is sufficiently cool enough. How well do you think a probe like this is doing measuring mixed air in a plenum like this? How could we test for mixing effectiveness in this plenum?
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LOREM IPSUM
DOLOR SIT AME
CONSECTETUR ADIPISCING ELIT. MORBI BIBENDUM PHARETRA LOREM, ACCUMSAN SAN NULLA.


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• Sollicitudin tempor sit amet non urna.
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LOREM IPSUM:
$150,000
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JOHN DOE
Licensed Real Estate Salesperson


Tlf.: +11 111 111 111
jhondoe@realestate.com
www.loremipsum.com



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Welcome to AEP


Combining cutting edge 3D models with on-site instruction.


On behalf of Robert Bahl and the Global Engineering & Facilities team, welcome to Marriott's Advanced Engineering Program. Congratulations on being nominated!


For the past 15 years, Advanced Engineering Program has strategically developed and deployed an accelerated and advanced level of training for the Engineering discipline. AEP is an 8-month enrichment course with a robust curriculum, designed to enhance and maximize your Engineering Leadership skills and Technical knowledge. The course will primarily be focused on Technical Engineering & Facilities training through webinars, 3D models, and on-site field labs.


Expect this course to advance your technical skills:
• HVAC Fundamentals
• HVAC Controls
• Functional Performance Tesitng
• System Diagramming
• Data Analysis and Excel Skills
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LOREM IPSUM
DOLOR SIT AMET
HTMLText_0B4B0DC1_11C0_6277_41A4_201A5BB3F7AE.html =
JOHN DOE
LICENSED REAL ESTATE SALESPERSON


Tlf.: +11 111 111 111
jhondoe@realestate.com
www.loremipsum.com



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## Tour ### Description ### Title tour.name = AEP Dallas - AHU-9 Controls (Duplicated)