Carrier 48/50PG C03-14 Operation And Service Manual

Contents

9Space Temperature Sensor Control − Direct Wired(T−55 or T−56 or T−59)Wire accessory space temperature sensor(s) to the T-55 terminalson the field connection terminal board located at the unit controlbox. Refer to Field-Installed Accessories section for additionalinformation.The Unit Control Type configuration, Configuration→UNIT→U.CTL, must be set to Space Sensor (3). The jumperwire in the installer’s packet must be connected between R and W1for heating mode to operate.T−58 Communicating Room SensorInstall the T-58 communicating thermostat. Connect the CCNcommunication bus from the T-58 to the CCN terminals on thefield connection terminal board located at the unit control box.Configure the unit’s CCN communication element number, busnumber, and baud rate. Configure the T−58’s CCN communicationbus number and baud rate the same as the unit, while the elementnumber has to be different. Configure the T−58 to send SPT to theunit’s element number. Refer to the Field−Installed Accessoriessection for additional information.The Unit Control Type configuration, Configuration→UNIT→U.CTL, must be set to Space Sensor (3). The jumperwire in the installer’s packet must be connected between R and W1for heating mode to operate.CCN Linkage ControlThe CCN communication must be properly configured for the48/50PG and 48/50PM units and all other devices. Linkageconfiguration is automatically done by the supervisory CCNLinkage device.The Unit Control Type configuration, Configuration→UNIT→U.CTL must be set to Space Sensor (3). The jumperwire in the installer’s packet must be connected between R and W1for heating mode to operate.Installation of an accessory supply air temperature (SAT) sensor inthe supply duct is recommended for Linkage applications. Asupply duct SAT measurement is valid for heating mode display,while the factory-standard internal SAT is not valid for heating dueto its location upstream of the heating section. When installing thesupply duct SAT, the heating mode display is enabled by settingConfiguration→HEAT→SAT.H to ENBL.Installation of an accessory return air temperature (RAT) sensor inthe return duct and wired to the space sensor input is recommendedfor Linkage applications. This will allow the unit to continue torun if Linkage communication is lost.System Pilot − Communication Space SensorInstall the System Pilot and connect the CCN communication busfrom it to the unit’s CCN connection on the low voltage terminalboard. Configure the unit’s CCN communication element number,bus number, and baud rate. Refer to the System Pilot’s installationinstructions for configuring it to be used as a space temperature andattaching it to a unit.Thermidistat ControlThe thermidistat is a thermostat and humidistat combinedand the inputs are provided on the field connectionterminal board. The unit control type configuration,Configuration→UNIT→U.CTL, default value is for thermostat(2) so there is no need to configure this item. The thermostatcontrol type configuration, Configuration→UNIT→T.CTL,selects the unit response to the thermostat inputs above. The spacehumidity switch configuration, Configuration→UNIT→RH.SW,identifies the normally open or normally closed status of this inputat LOW humidity, and the input is the Humidistat 1 terminal (onlyon Humidi-MiZer units).Space Humidistat ControlFor units with the factory Humidi-MiZer option, thehumidistat input is provided on the field connectionterminal board. The Space Humidity Switch configuration,Configuration→UNIT→RH.SW, identifies the normally open ornormally closed status of this input at LOW humidity. Humidistat2 terminal is the 24 VAC source for dry contact and the Humidistat1 terminal is the signal input.NOTE: On units with Humidi-MiZer, the Humidistat terminals1 and 2 are the same as the Fire Shutdown terminals 1 and 2 on astandard unit. See Fire Shutdown section.Relative Humidity Sensor ControlFor units with the factory installed Humidi-MiZer option and theeconomizer option (with the ECB−economizer control board), thehumidity sensor input is provided on the field connection terminalboard (TB1/TB2). The sensor can be used in addition to or insteadof a humidistat or thermidistat. The RH Sensor on OAQ Inputconfiguration, Configuration→UNIT→RH.S=YES, identifies thatthe sensor is being used instead of an OAQ sensor. Adjust RHsetpoints as needed. Terminal 1 is the 24vdc loop power andTerminal 4 is the 4−20 mA signal input. Refer to the Field InstalledAccessories and Humidi-MiZer Operation sections for moreinformation.CCN CommunicationConfigure Configuration→CCN→CCN.A to desired elementnumber. (Default is 1.) Configure ConfigurationCCN CCN.Bto desired bus number. (Default is 0.) ConfigureConfiguration→CCN→BAUD to desired code number for baudrate (Default is 3 = 9600 baud).AccessoriesBelow are quick configuration settings for field installedaccessories. If these accessories were installed by the factory, theywill already be configured. See the Field−Installed Accessoriessection, third party control, control connection tables, and CCN orDisplay parameter tables for any accessories not mentioned belowand any additional information on accessories.EconomizerIf an Economizer accessory was field installed, the unit must beconfigured for it by setting ConfigurationECONEC.EN toYES. The default settings for the other economizer configurationsshould be satisfactory. If they need to be changed, additionalinformation about these configuration settings can be found in theEconomizer section.Power ExhaustIf a Power Exhaust accessory was field installed, the unit must beconfigured for it by setting ConfigurationECONPE.EN toENBL. The default settings for the other power exhaustconfigurations should be satisfactory. If they need to be changed,additional information about these configurations can be found inthe Power Exhaust section.Electric HeatIf an Electric Heat accessory was field installed, the unit must beconfigured for it by setting Configuration→HEAT→HT.TY to avalue of 2. The number of electric heat stages must be configuredby setting Configuration→HEAT→N.HTR per the installedheater.Fire ShutdownIf a Fire Shutdown or Smoke Detector accessory was fieldinstalled, the unit must be configured for it by settingConfiguration→UNIT→FS.SW to normally open (1) or normallyclosed (2) when there is not a fire alarm. Normally open (1) is thepreferred configuration.48/50PG and PM