Carrier 48LC Series Controls, Start-up, Operation And Troubleshooting

Also see for 48LC 05: Controls, Start-Up, Operation and Troubleshooting Service and maintenance instructions Service and maintenance instructions

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Carrier 48LC Series Controls, Start-up, Operation And Troubleshooting Manual pdf 3 page image

3UNIT DAMAGE HAZARDFailure to follow this caution may cause equipmentdamage.This unit uses a microprocessor--based electronic controlsystem. Do not use jumpers or other tools to short outcomponents or to bypass or otherwise depart fromrecommended procedures. Any short--to--ground of thecontrol board or accompanying wiring may destroy theelectronic modules or electrical components.CAUTION!FIRE, EXPLOSION HAZARDFailure to follow this warning could result in personalinjury, death and/or property damage.Improper installation, adjustment, alteration, service, ormaintenance can cause property damage, personal injury, orloss of life. Refer to the User’s Information Manualprovided with this unit for more details.Do not store or use gasoline or other flammable vapors andliquids in the vicinity of this or any other appliance. Whatto do if you smell gas:1. DO NOT try to light any appliance.2. DO NOT touch any electrical switch, or use any phone inyour building.3. IMMEDIATELY call your gas supplier from a neighbor’sphone. Follow the gas supplier’s instructions.4. If you cannot reach your gas supplier, call the firedepartment.! WARNINGGENERALThis publication contains Start--Up, Controls, Operation, Service,and Troubleshooting information for the 48/50LC rooftop unitsequipped with the factory--installed optional SystemVut controls(version 2.X or higher) and use Puronr (R--410A) refrigerant. Thespecific base unit installation instructions, service manual and/orwiring label diagram may also be required in conjunction with thisbook as a guide to a specific unit on the roof. All units in Table 1are Staged Air Volume (SAVt) units that allow for stand--alone ornetwork operation.Table 1 – Rooftop UnitsMODEL SIZE NOMINAL TONS48/50LC04 305 406 507 608 7.509 8.512 1014 12.517 1520 17.524 2026 23Conventions Used in This ManualThe following conventions for discussing configuration points forthe local display (SystemVu controller or Navigatort accessory)will be used in this manual.Menu paths will be written with the main menu name first, thenany menus or sub menus, each separated by an arrow symbol ()and will also be shown in bold and italics. As an example, theGeneral sub menu which is located in the Setting main menu underUnit Configuration menu would be written as SETTINGSUNIT CONFIGURATIONSGENERAL.This path name will show the user how to navigate through thelocal display to reach the desired menu. The user scrolls throughthe Menus using the up and down keys. The arrow symbol in thepath name represents pressing ENTER to move into the next levelof the menu structure.Point names are referenced in in parentheses and bold and italics aswould be shown on the local display.CCN point names are also referenced for users configuring theunit with CCN software instead of the local display. SeeAppendix A at the end of this manual.BASIC CONTROL USAGESystemVu Control (factory--installed option)The SystemVu control is a comprehensive unit-managementsystem. The control system is easy to access, configure, diagnoseand troubleshoot.The SystemVu control system is fully communicating andcable-ready for connection to the Carrier Comfort Network(CCN), Carrier i--Vu, and Third Party BACnet* buildingmanagement systems. The control provides high-speedcommunications for remote monitoring via the Internet. Multipleunits can be linked together (and to other Direct Digital Control(DDC) equipped units) using a 3-wire communication bus.The SystemVu control system is easy to access through the use of aintegrated display module. A computer is not required for start-up.Access to control menus is simplified by the ability to quicklyselect from 7 main menu items. An expanded readout providesdetailed explanations of control information. Only six buttons arerequired to maneuver through the entire controls menu. Thedisplay readout is designed to be visible even in bright sunlight.BACK ENTER MENURUNALERTFAULTSystem uTESTTESTC14319Fig. 1 -- SystemVu InterfaceSystemVu InterfaceThis integrated device is the keypad interface used to access thecontrol information, read sensor values, and test the unit. Theinterface is located in the main control box and is standard on allunits. The interface is a 6--key, 4x30 character, LCD (liquid--crystaldisplay) display module. The interface also contains Status LEDs.(See Fig. 1.) The interface is easy to operate using 6 buttons andthe main menu structures shown in Fig. 2.Through the SystemVu interface, the user can access all of theinputs and outputs to check on their values and status, configureoperating parameters, and evaluate the current decision status foroperating modes. The control also includes an alarm history whichcan be accessed from the display. The user can access a built--in testroutine that can be used at start--up commissioning andtroubleshooting.* BACnet is a registered trademark of ASHRAE (American Society ofHeating, Refrigerating and Air ---Conditioning Engineers).