8Table 2 — ComfortLink™ Navigator™ Display Menu StructureChanging the Display Language — The Navigator displayhas five language options to select from, English, Espanol,Francais, Portugues, and Translated. The “Translated” option isnot supported at this time. The factory default language isEnglish. To change the display language, the following itemmust be changed.NOTE: When the Language Selection (ConfigurationDISPLANG) variable is changed, all appropriate displayexpansions will immediately change to the new language. Thefour letter/digit code will not change. No power-off or controlreset is required when reconfiguring languages.Adjusting the Contrast — The contrast of the display can beadjusted to suit ambient conditions. To adjust the contrast, enterthe LED Test mode of the device.Pressing will access the TEST point. Pressingagain will cause the “OFF” to flash. Use the up ordown arrow to change “OFF” to “ON.” Pressing willilluminate all LEDs and display all pixels in the view screen.Pressing and simultaneously allows theuser to adjust the display contrast. The display will read:Adjust Contrast- - - -+ - - - - - - - - - - - - - - -Use the up or down arrows to adjust the contrast. Thescreen’s contrast will change with the adjustment. Pressto accept the change. The Navigator module willkeep this setting as long as it is plugged in to the LEN (LocalEquipment Network) bus.Adjusting the Backlight Brightness — The backlight of thedisplay can be adjusted to suit ambient conditions. The factorydefault is set to the highest level. To adjust the backlight of theNavigator module, enter the LED Test mode of the device.Pressing will access the TEST point. Pressingagain will cause the “OFF” to flash. Use the up ordown arrow to change “OFF” to “ON.” Pressing willilluminate all LEDs and display all pixels in the view screen.Pressing the up and down arrow keys simultaneously allowsthe user to adjust the display brightness. The display will read:Adjust Brightness- - - - - - - - - - - - - - - - - +Use the up or down arrow keys to adjust screen brightness.Press to accept the change. The Navigator modulewill keep this setting as long as it is plugged in to the LEN bus.CONTROLSGeneral — The 30XA air-cooled liquid chillers contain theComfortLink™ electronic control system that controls andmonitors all operations of the chiller. The control system iscomposed of several components as listed in the following sec-tions. All machines have a Main Base Board (MBB), Touch Pi-lot™ module, electronic expansion valve board (EXV), fanboard, Compressor Protection board, Emergency On/Offswitch, and an Enable-Off-Remote Contact switch.Main Base Board (MBB) — The MBB is the core ofthe ComfortLink control system. It contains the major portionof operating software and controls the operation of themachine. See Fig. 8. The MBB continuously monitors input/output channel information received from its inputs and fromall other modules. The MBB receives inputs from status andfeedback switches, pressure transducers and thermistors. TheMBB also controls several outputs. Some inputs and outputsthat control the chiller are located on other boards, but aretransmitted to or from the MBB via the internal communica-tions bus. Information is transmitted between modules via a 3-wire communication bus or LEN (Local Equipment Network).The CCN (Carrier Comfort Network®) bus is also supported.Connections to both LEN and CCN buses are made at TB3.MODERUNSTATUSSERVICETEST TEMPERATURES PRESSURES SETPOINTS INPUTS OUTPUTS CONFIGURATION TIMECLOCKOPERATINGMODES ALARMSAuto Display(VIEW)ManualTest Mode(TEST)UnitTemperatures(UNIT)Circuit APressures(PRC.A)CoolingSetpoints(COOL)GeneralInputs(GEN.I)Circuit AOutputs(CIR.A)DisplayConfiguration(DISP)Time of Day(TIME)OperatingControl Type(SLCT)Reset CurrentAlarms(R.ALM)MachineStarts/Hours(RUN)QuickTest Mode(QUIC)Circuit ATemperatures(CIR.A)Circuit BPressures(PRC.B)HeatingSetpoints(HEAT)Circuit BOutputs(CIR.B)UnitConfiguration(UNIT)Day, Date(DATE)OperatingModes(MODE)CurrentAlarms(ALRM)CompressorRun Hours(HOUR)Circuit BTemperatures(CIR.B)Circuit CPressures(PRC.C)Misc.Setpoints(MISC)Circuit COutputs(CIR.C)ServiceConfigurations(SERV)Schedule 1(SCH1)AlarmHistory(H.ALM)CompressorStarts(STRT)Circuit CTemperatures(CIR.C)GeneralOutputs(GEN.O)OptionsConfiguration(OPTN)Schedule 2(SCH2)Fan RunHours(FAN)Reset,Demand Limit,Master/Slave(RSET)Holidays(HOLI)CompressorDisable(CP.UN)ServiceMaintenanceConfiguration(MCFG)PredictiveMaintenance(MAIN)Software Versions(VERS)ITEM ITEM EXPANSION PATH VALUELANG Language Selection ConfigurationDISPEnglishEspanolFrancaisPortuguesTranslatedITEM ITEM EXPANSION PATH VALUETEST Test Display LEDs ConfigurationDISPENTERENTERENTERENTER ESCAPEENTERITEM ITEM EXPANSION PATH VALUETEST Test Display LEDs Configuration ModeDISPENTERENTERENTERENTER