Manuals / Carrier / Household Appliance / Air Conditioner

Carrier 48FK, JK034-074, 50FK specifications Ð Thermistor T3 and T4 Locations, Size 054-104 Units

Models: 48FK 50FK JK034-074

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054 UNITS

054 UNITS

064, 074, 078 UNITS

088, 104 UNITS

Fig. 14 Ð Thermistor T3 and T4 Locations, Size 054-104 Units

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Carrier 48FK, JK034-074 Ð Thermistor T3 and T4 Locations, Size 054-104 Units, UNITS 064, 074, 078 UNITS 088, 104 UNITS

Contents

48FK,JK034-074 50FK,FY,JK,JY034-104 Variable-Air Volume Rooftop Units Controls Operation and TroubleshootingGENERAL CONTENTS contSAFETY CONSIDERATIONS Fig. 1 Ð Processor Board Table 1 Ð Pin Terminal Connector J1 Thermistor InputsReturn-Air Temperature Table 2 Ð Pin Terminal Connector J2 Status Switch Inputs Fig. 3 Ð Pin Terminal Connector J2Status Switch Inputs Fig. 2 Ð Pin Terminal Connector J1 Thermistor InputsThe potentiometer locations and functions are as follows Fig. 5 Ð Relay Board Table 3 Ð Output Pin and Terminal AssignmentsCompressor Operation 48FK,JK ONLY Fig. 8 Ð Thermistor T1 Location, 50FK,JK034-048 UnitsGAS SECTION HORIZONTAL SUPPLY SECTIONGAS SECTION Fig. 9 Ð Thermistor T1 Location, 48FK,JK, 50JY and50JKX,JKY 054-074 Units and 50FKX,FKY and 50FY054-104 Units Fig. 10 Ð Thermistor T1 Location, 50FK,JK054-074 UnitsSTANDARD Fig. 11 Ð Thermistor T2 Location, Size 034-048 UnitsFig. 12 Ð Thermistor T2 Location, Size 054-104 Units Fig. 13 Ð Thermistor T3 and T4 Locations Size 034-048 Units054 UNITS 064, 074, 078 UNITS 088, 104 UNITS Fig. 14 Ð Thermistor T3 and T4 Locations, Size 054-104 UnitsFig. 18 Ð Variable Frequency Drive Sizes 034-048 and Fig. 15 Ð Accessory Relay Board Standard Factory SuppliedFig. 16 Ð Two-Step Demand Limit Module Fig. 17 Ð Enthalpy Sensor LocationSpace Temperature Reset CONTROLS INSTALLATIONFig. 20 Ð Unit Control Box Arrangement, Sizes Fig. 21 Ð Unit Control Box Arrangement, Sizes Fig. 22 Ð Unit Control Box Arrangement, Sizes 088 and Fig. 24 Ð Heat Interlock Relay Fig. 23 Ð Occupied/Unoccupied Switch with Night Setback ThermostatFig. 25 Ð Accessory Reset Board Voltage Drop CharacteristicsFig. 26 Ð Space Temperature Sensor Averaging 2-Step Demand Limit Control Module Fig. 29 Ð 115-Volt Field Wiring to AccessoryFig. 27 Ð Single-Step Demand Limit Fig. 28 Ð Two-Step Demand Limit ModuleThis emulation requires the following eld-supplied parts R Ð Resistor Factory Installed Factory Wiring Field Wiring Fig. 30 Ð Remote SASP WiringFig. 31 Ð External Alarm Indication P Ð Manual Potentiometer R Ð Fixed Resistor Field WiringFire Table 6 Ð Smoke Control Switches Required for Each ModeModulating Power Table 5 Ð Smoke Control ModesSIZE in Table 7 Ð Switch FunctionsModulating Power Exhaust Table 8 Ð Tubing SizeALL UNITS Fig. 32 Ð Smoke Control Wiring034-048 UNITS Fig. 35 Ð Modulating Power Exhaust Differential Pressure Switch Sizes Fig. 33 Ð Modulating Power Exhaust and InletGuide Vane Differential Pressure Switch Sizes Pressure Switch and Variable Frequency DriveTable 11 Ð Conguration Header Jumpers Table 10 Ð Conguration Header and DIP Switch Factory SettingsTable 9 Ð Potentiometer Inputs and Ranges Table 12 Ð DIP Switches Size 078-104 Units Fig. 36 Ð Inlet Guide Vane Motor 50FK,JK034-074 UnitsFig. 37 Ð Inlet Guide Vane Motor, 48FK,JK, 50FY,JY and 50FJX,FJY,FKX,FKY034-074 Units Fig. 38 Ð Inlet Guide Vane MotorFig. 41 Ð Jumper Removal to Disable Motor READ STOP WRITE RESETFig. 39 Ð Differential Pressure Switch for Inlet Guide Modulating Power Exhaust OptionTable 14 Ð Changing the VFD Set Point Frequency Command Modulating Power Exhaust Option or AccesTable 13 Ð VFD Set Point Frequency Command for Duct Pressure START UNIT NORMAL Table 15 Ð Quick Test, Unit Conguration and Switch CheckCONTROL SWITCH QUICKTable 17 Ð Quick Test, Output Relay Check Table 16 Ð Quick Test, Thermistor and Potentiometer CheckTable 18 Ð Sensor Resistance Values OPERATING INFORMATIONwarm-up routine, and a 26 will be displayed 044 AND 048 UNITS Fig. 42 Ð Component Arrangement, 034-048 Units034 AND 038 UNITS 088, 104 UNITS 104 UNITS Fig. 43 Ð Component Arrangement, 054-104 Units054, 064 UNITS 074, 078 UNITSSupply Fan Control with IGV Ð In most VAV units, the supply fan static pressure is controlled by inlet guide vanes. The inlet guide vanes operate independently from the micro- processor. The supply static pressure is controlled by a dif- ferential pressure switch. If the unit is equipped with a re- turn fan, building pressure is controlled by another differential pressure switch Fig. 44 Ð Modulating Power Exhaust Component Locations Sizes Fig. 45 Ð Modulating Power Exhaust Component Locations Sizes Page Table 19 Ð Compressor Loading and Unloading Sequences Table 19 Ð Compressor Loading and Unloading Sequences cont Table 21 Ð Operation Status Codes TROUBLESHOOTINGTable 20 Ð Controls Troubleshooting Table 22 Ð Diagnostic Codes ergize alarm light and cause an error code of 83 to be dis · Wiring Problem Ð If the circuit is open, a failure will be detected82 to be displayed on display board when display button is will be energized and an error code of 82 will be displayedPage Fig. 49 Ð Relay Board Test Points Fig. 48 Ð Processor Board Test PointsTable 23 Ð Voltage Reading Fig. 50 Ð Relay Board Pin Terminal Connector J9Fig. 51 Ð Display Board Pin Terminal Connector J10 Step 2 Ð High-voltage relay resistance check Table 24 Ð Pin Terminal Connector J1 VoltagesTable 25 Ð Pin Terminal Connector J2 Voltages Step 1 Ð Low-voltage relay resistance checkTable 28 Ð Enthalpy Sensor Checkout Table 27 Ð Terminal Strip J5 Connector Resistance ReadingVariable Frequency Drive Fig. 52 Ð Damper Motor Connection Diagram VAV1. Disconnect all power to the unit and the VFD Gr.SF Table 29 Ð Carrier Default Program Parameter ValuesFrequency Settings Gr.FbFig. 54 Ð Variable Frequency Drive Terminal Block Size 054-104 Units Table 30 Ð Required User Adjusted DefaultsTable 31 Ð Motor Overload Settings Fig. 53 Ð Variable Frequency Drive Terminal Block Size 034-048 UnitsLEGEND AND NOTES FOR FIG Page Page CALL FOR FREE CATALOG SERVICE TRAININGI. PRE-START-UP START-UP CHECKLISTII. PRELIMINARY CHECKLIST ITEMS CONTROL SETTINGSELECTRICAL TEMPERATURESIII. START-UP IV. NOTES