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

Also see for 48FC 04: Installation instructions

Carrier 48FC Series Controls, Start-up, Operation And Troubleshooting Manual pdf 12 page image

12THIRD PARTY CONTROLThird party controls may interface with the unit SystemVutcontroller through the connections described below. See othersections of these instructions for more information on the relatedunit control and configurations.Cooling/Heating ControlThe thermostat inputs are provided on TB1 of the board. TheUnit Control Type configuration, UNIT CONTROL TYPE,must be 0 (Tstat) to recognize the below inputs. Terminal R isthe 24--VAC source for the following:Y1 = first stage coolingY2 = second stage coolingW1 = first stage heatingW2 = second stage heatingG = Indoor fanDehumidification ControlFor units with factory installed Humidi--MiZerR system option, thehumidistat input is defaulted for use on the Y3 thermostat inputscrew terminal as a normally open switch. This can be changedwith the Humidistat Switch Channel configuration (HUMSTATCHANNEL) and the Humidistat switch type configuration(HUMSTAT SW TYPE).Remote OccupancyThe remote occupancy input can be provided on one of theconfigurable inputs, most commonly TB3. The RemoteOccupancy Switch configuration, REMOTE OCC TYPE,identifies the normally open or normally closed status of this inputwhen unoccupied. The Remote Occupancy Channel configuration,REMOTE OCC CHAN, identifies the discrete input (DI) assignedfor this function.Remote ShutdownThe remote shutdown input is provided for unit shutdown in responseto switch input configured most commonly on TB3. The RemoteShutdown Switch configuration, REM. SHUTDOWN TYPE,identifies the normally open or normally closed status of this inputwhen there is no shutdown command. The Remote ShutdownChannel configuration, REM. SHUTDOWN CHAN, identifies thediscrete input (DI) assigned for this function.Alarm OutputThe alarm output is provided on as a configurable relay, mostcommonly on TB2, to indicate when a current alarm is active. Theoutput will be 24--VAC if a current alarm exists. The Alarm RelayChannel configuration, ALM RELY CHANNEL, identifies thediscrete output (DO) assigned for this function.Economizer Damper ControlFor units with the economizer option or accessory, the damperposition can be directly controlled through the IAQ sensor input.The IAQ Analog Input configuration, IAQ LEVEL CONTROLwill have to set to 2 (CTL MINP). When IA.CF = 2, an external 4to 20 mA source is used to move the damper 0% to 100% directly.CONTROLS OPERATIONDisplay ConfigurationThe SETTINGSDISPLAY SETTINGS submenu is used toconfigure the local display settings.METRIC DISPLAYThis variable is used to change the display from English units toMetric units.LANGUAGEThis variable is used to change the language of the SystemVudisplay. At this time, only English is available.CONTRAST ADJUSTThis is used to adjust the contrast of the SystemVu display.PASSWORD ENABLE?This variable enables or disables the use of a user password. Thepassword is used to restrict use of the control to change configurations.VIEW USER PASSWORDThis menu allows the user to view the user password. Thepassword must be entered or disabled to view it.CHANGE USER PASSWORDThis menu allows the user to change the user password. Thepassword must be entered or disabled to change it.Unit ConfigurationMany configurations that indicate what factory options and/or fieldaccessories are installed and other common operation variables areincluded in SETTINGSUNIT CONFIGURATION submenu.Some of these configurations will be set in the factory for thefactory--installed options (FIOPs). Field installed accessories andcustom control functions will require configuration changes. TheSETTINGSUNIT CONFIGURATIONGENERAL submenucontains the following control configurations. Refer to otherspecific sections for other configurations.STARTUP DELAYThis configuration sets the control start-up delay after the power isinterrupted. This can be used to stagger the start-up of multipleunits.UNIT CONTROL TYPEThis configuration defines if temperature control is based onthermostat inputs or space temperature sensor input. TSTAT valueis when then unit determines cooling and heating demand by thestate of G, Y1, Y2, W1, and W2 inputs from a space thermostat.This value is the factory default. SPACE SEN value is when theunit determines cooling and heating demand based on the spacetemperature and the appropriate set point. RAT SEN value is whenthe unit determines cooling and heating demand based on thereturn air temperature and the appropriate set point. SPACE SENor RAT SEN are also used as Linkage configuration.THERMOSTAT TYPEThis configuration applies only if Unit Control Type is Thermostat.The value determines how the inputs are interpreted. See thespecific operation sections for more information. The followingdescriptions define what each value means.0 = CONV 2C2H – Conventional Thermostat 2 stage cool and2 stage heat.1 = DIGI 2C2H – Digital Thermostat 2 stage cool and 2 stage heat.2 = CONV 3C2H – Conventional Thermostat 3 stage cool and2 stage heat. This is the default setting.3 = DIGI 3C2H – Digital Thermostat 3 stage cool and 2 stage heat.ADAPTIVE TSTATThis configuration applies only if the Unit control type isThermostat. When this is YES the control will use AdaptiveControl for cooling and heating staging. When this is set to NO thecontrol will use the Traditional Thermostat Control, howeverduring integrated cooling Adaptive is always used.DIRTY FILTER TIMEThis configuration defines the life of the installed filter. A timerwill count down from this number while the indoor fan is running.At the expiration of this timer, an alert will be activated to indicatea filter change is required.TEST MODE TIMEOUTThis configuration defines the time at which a test mode test hasnot changed state will automatically disable test mode. Thisconfiguration will disable the timeout when set to 0 (Disabled).