Carrier 50PG20-28 Controls, Start-up, Operation, Service And Troubleshooting Instructions

Also see for 48PG20---28: User's information manual User's information manual Installation and service instructions

Carrier 50PG20-28 Controls, Start-up, Operation, Service And Troubleshooting Instructions Manual pdf 39 page image

IAQ Switch -- For units with the economizer option oraccessory and the ECB control board, the IAQ switch inputis provided on the field connection terminal board (TB2). TheIAQ Switch Input configuration, Configuration-->AIR.Q--->I!.CEidentifies the nonnatly open or nonnatly closed statusof this input when the indoor air quality value is low (good)and also selects the unit response to this input.6 24 VAC source for dry contact7 24 VAC simaal inputNOTE: An IAQ switch cannot be used if an enthalpy switch isalready on this input.IAQ Sensor -- For units with the econolnizer option oraccessory and the ECB control board, the IAQ sensor inputis provided on the field connection terminal board (TB2). TheIAQ Analog Input configuration, Configumtion-->AIR.Q---_IA.(T selects the unit response to this input. Default conver-sion to 0 to 2000 ppm can be changed in the configurations.2 4-20 mA + simnat3 4-201hA colrnnonOAQ Sensor -- For units with the economizer option oraccessory and the ECB control board, the OAQ sensor input isprovided on the field connection tenninat board (TB2). TheOAQ Analog Input configuration, Configumtion--_AIR.Q--->OA.15Tselects the unit response to this input. Default con-version to 0 to 2000 ppm can be changed in the configurations.3 4-20 mA COlranon4 4-20 mA + simaatNOTE: An OAQ sensor cannot be used ifa humidity sensor isused.CONTROLS OPERATIONDisplay Configuration -- The Configuration-->DISPsubmenu is used to configure the local display settings.Metric Display (METR) This variable is used to changethe display tiom English units to Metric units.Language Selection (LANG) This variable is used tochange the language of the ComJortLink display. At this time,only English is available.Password Enable (PROT) This variable enables or dis-ables the use of a password. The password is used to restrictuse of the control to change configurations.Selwice Password (PSWD) This variable is the 4-digitnumeric password that is required if enabled.Test Display LEDs (TEST) This is used to test the opera-tion of the ComJbrtLink display.M odes -- The ComJortLink controls operate under a hierar-chy of colrnnand structure as defined by tbur main elements:the System Mode, the HVAC Mode, the Occupied stares, andthe Unit Control Type.The System Mode is the top level that defines three mainstates of the control system: Disabled, Enabled, or Test.The HVAC Mode is the next level that defines four mainstates of functional operation: Disabled, Fan Only, Cool, andHeat.The Occupied stares affects set points for cooling andheating in Space Sensor control mode and operation of theeconomizer for indoor air quality ventilation and fiee cooling.The Unit Control Type (Configutvttion-->U?CTT-->U.CTL)de151es if temperature control is based on thermostat inputs orspace temperature sensor input.The general operating mode of the control and the stares ofsome related operation lockouts are located on the display attwo locations: Run Status _ MODE and Operating Modes---_MODE.System Mode (SYS) In Run Stares, the current systemmode is displayed as a number with expandable text. InOperating Modes, system mode is displayed as expandabletext.RUN STATUS OPERATING MODESNUMBER EXPANDED TEXT EXPANDED TEXT1 Disabled Unit Operation Disabled2 Enabled Unit Operation Enabled3 Test Serv ce Test Enab edHVAC Mode (HVA153 In Run Status, the current allowedHVAC mode is displayed as a number with expandable text. InOperating Modes, HVAC mode is displayed as expandabletext.RUN STATUSNUMBER EXPANDED TEXT1 Disabled2 Fan Only3 Cool4 HeatOPERATING MODESEXPANDED TEXTHVAC Operation DisabledVentilation (Fan Only)Cooling or Free CoolingHeatingNOTE: Optional Humidi-MiZer TM operation is includedwithin Cooling 1node.Currently Occupied (OI5'153 Displays the current state ofassumed space occupancy based on unit configuration andinputs.Timed Override in Effect (T.OVR) Displays if the state ofoccupancy is currently occupied due to an override.Linkage Active (LINK) Displays if a linkage master in azoning system has established "linkage" with this unit.Circuit OAT Lockout (C.L0153 Displays if one or morerefiigerant circuits operation is prevented due to outdoortemperature limit lockout.Heat OAT Lockout (H.L0153 Displays if heating operationis prevented due to outdoor temperature limit lockout.Econo Cool OAT Lockout (E.LOC) Displays if econo-mizer operation for cooling is prevented due to outdoortemperature limit lockout.Unit Configuration- Many configurations that indi-cate what factory options and/or field accessories are installedand other colrnnon operation variables are included in UnitConfiguration (15bnfiguration--+UNII). Configuration will bedone at the factory for any factory-installed option (FIOP).Start-Up Delay (S.DLI) This configuration sets the con-trol start-up delay after the power is interrupted. This can beused to stagger the start-up oflnultipte units.Unit Control Type (U.CTL) This configuration defines iftemperature control is based on thermostat inputs or spacetemperature sensor input.• U.CTL = 2 (Thermostat) The unit determines coolingand heating demand by the state of G, Y1, Y2, W1, andW2 inputs from a space therlnostat. This value is thefactory default.• U.CTL = 3 (Space Sensor) The unit determines coolingand heating delnand based on the space temperature andthe appropriate set point.Thermostat Control Type (T..CTL) This configuration ap-plies only if Unit Control Type is Therlnostat (15bnfigumtion--->Un#-->U.15TL= 2). The value determines alternative cool-ing and Hmnidi-MiZer circuit staNng. See the Cooling andHumidi-MiZer sections for more il_'onnation. The factorydefault value is T.15TL= 0 (Adaptive).Fan On When Occupied (OC.FN) This configuration ap-plies only if Unit Control Type is Space Sensor (Configm.ation_Un#--+U.15TL = 3). A YES value wilt operate the indoor t_anwhenever the unit is in the Occupied mode. A NO value wiltoperate the indoor tan only when heating or cooling is neces-salT. The factory default value is YES.39