Carrier WeatherExpert 48N2 Controls, Start-up, Operation, Service And Troubleshooting Instructions

Also see for WeatherExpert 48N2: Installation instructions Installation instructions Controls, start-up, operation, service, and troubleshooting Installation instructions

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Carrier WeatherExpert 48N2 Controls, Start-up, Operation, Service And Troubleshooting Instructions Manual pdf 28 page image

28ConfigurationECONEC.MN should always be set forthe minimum damper position.If the unit is equipped with an outdoor air flow station, thefollowing points in ConfigurationECONCFM.C need tobe set.If equipped with an outdoor flow station, make sureConfigurationECONCFM.COCF.S is enabled. If anoutdoor air cfm station is used, then the economizer will con-trol to cfm, not a position, as long as the sensor is valid. There-fore, ConfigurationECONCFM.CO.C.MX super-sedes ConfigurationECONEC.MN. Without CFM or en-thalpy control, the outdoor-air dampers will open to minimumposition when the supply fan is running. Outdoor-air damperswill spring-return closed upon loss of power or shutdown of thesupply fan.Indoor Air Quality ConfigurationsDEMAND CONTROL VENTILATION — Under Configu-rationIAQDCV.C, the following configuration parame-ters should be set to establish the minimum and maximumpoints for outdoor air damper position during demand con-trolled ventilation (DCV):EC.MN Economizer Min.PositionIAQ.M IAQ Demand Vent Min.Pos.O.C.MX Economizer Min. FlowO.C.MN IAQ Demand Vent Min. FlowConfigurationIAQDCV.CIAQ.M is used to set theabsolute minimum vent position (or maximum reset) underDCV.ConfigurationIAQDCV.CEC.MN is used to set theminimum damper position (or with no DCV reset). This is alsoreferenced in the economizer section.ConfigurationIAQDCV.CO.C.MX is used onlywith the outdoor airflow station and will supersedeConfigurationIAQDCV.CEC.MN as long as the out-door air cfm sensor is valid.ConfigurationIAQDCV.CO.C.MN is used onlywith the outdoor airflow station and will supersedeConfigurationIAQDCV.CIAQ.M as long as the out-door air cfm sensor is valid.Exhaust Configurations — The following exhaustoptions should be configured.ConfigurationBPBF.CF=1 — Under ConfigurationBP the following configurations may be adjusted:Under ConfigurationBPB.V.A the following configu-rations may be adjusted:BP.FS VFD/Act. Fire SpeedBP.MN VFD/Act. Min. SpeedBP.MX VFD Maximum SpeedConfigurationBPBP.CF=2 (Return Fan Tracking Con-trol) — Under ConfigurationBP the following configura-tions may be adjusted:BP.SP Building Pressure Setpoint (see note below)Under ConfigurationBPB.V.A the following configu-rations may be adjusted:BP.FS VFD/Act. Fire SpeedBP.MN VFD/Act. Min. SpeedBP.MX VFD Maximum SpeedUnder ConfigurationBPFAN.T the following config-urations may be adjusted:FT.CF Fan Track Learn Enable (see note below)FT.TM Fan Track Learn Rate (see note below, notused when Fan Track Learning is disabled)FT.ST Fan Track Initial DCFMFT.MX Fan Track Max Clamp (see note below, notused when Fan Track Learning is disabled)FT.AD Fan Track Max Correction (see note below,not used when Fan Track Learning is disabled)FT.OF Fan Track Internl EEPROM (see note below,not used when Fan Track Learning is disabled)FT.RM Fan Track Internal Ram (see note below, notused when Fan Track Learning is disabled)FT.RS Fan Track Reset Internal (see note below, notused when Fan Track Learning is disabled)NOTE: These configurations are used only if Fan Track Learn-ing is enabled. When Fan Track Learning is enabled, the con-trol will add an offset to the Fan Track Initial DCFM(ConfigurationBPFAN.TFT.ST) if the building pres-sure deviates from the Building Pressure Set Point (BP.SP).Periodically, at the rate set by the Fan Track Learn Rate(FT.TM) the delta cfm is adjusted upward or downward with amaximum adjustment at a given instance to be no greater thanFan Track Max correction (FT.AD). The delta cfm can notever be adjusted greater than or less than the Fan Track MaxClamp (FT.MX).Set Clock on VFD — The clock set mode is used forsetting the date and time for the internal clock of the VFD. Inorder to use the timer functions of the VFD control, the internalclock must be set. The date is used to determine weekdays andis visible in the fault logs. Refer to the VFD section in Appen-dix D on page 211 for information on operating the VFD andusing the keypad.To set the clock, perform the following procedure from theVFD keypad:1. Select MENU (SOFT KEY 2). The Main menu will bedisplayed.2. Use the UP or DOWN keys to highlight TIME ANDDATE SET on the display screen and press ENTER(SOFT KEY 2). The clock set parameter list will bedisplayed.3. Use the UP or DOWN keys to highlight CLOCK VISI-BILITY and press SEL (SOFT KEY 2). This parameteris used to display or hide the clock on the screen. Use theUP or DOWN keys to change the parameter setting. PressOK (SOFT KEY 2) to save the configuration and returnto the Clock Set menu.4. Use the UP or DOWN keys to highlight SET TIME andpress SEL (SOFT KEY 2). Use the UP or DOWN keys tochange the hours and minutes. Press OK (SOFT KEY 2)to save the configuration and return to the Clock Setmenu.5. Use the UP or DOWN keys to highlight TIME FORMATand press SEL (SOFT KEY 2). Use the UP or DOWNkeys to change the parameter setting. Press OK (SOFTKEY 2) to save the configuration and return to the ClockSet menu.6. Use the UP or DOWN keys to highlight SET DATE andpress SEL (SOFT KEY 2). Use the UP or DOWN keys tochange the day, month, and year. Press OK (SOFT KEY2) to save the configuration and return to the Clock Setmenu.7. Use the UP or DOWN keys to highlight DATE FOR-MAT and press SEL (SOFT KEY 2). Use the UP orDOWN keys to change the parameter setting. Press OKUEFC Unoccupied Economizer Free CoolingACT.C Economizer Actuator ConfigBP.SP Building Pressure Set PointBP.SO BP Set Point Offset