Manuals / Carrier / Household Appliance / Air Conditioner

Carrier JK034-074, 50FK, 48FK specifications

Models: 48FK 50FK JK034-074

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Fig. 55 Ð Typical Wiring Schematic; 48FK,JK and 50FK,FY,JK,JY Units (054-074 Shown) (cont)

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Carrier JK034-074, 50FK, 48FK specifications

Contents

48FK,JK034-074 50FK,FY,JK,JY034-104 Variable-Air Volume Rooftop Units Controls Operation and TroubleshootingCONTENTS cont SAFETY CONSIDERATIONSGENERAL Table 1 Ð Pin Terminal Connector J1 Thermistor Inputs Return-Air TemperatureFig. 1 Ð Processor Board Status Switch Inputs Fig. 3 Ð Pin Terminal Connector J2Fig. 2 Ð Pin Terminal Connector J1 Thermistor Inputs Table 2 Ð Pin Terminal Connector J2 Status Switch InputsThe potentiometer locations and functions are as follows Fig. 5 Ð Relay Board Table 3 Ð Output Pin and Terminal AssignmentsCompressor Operation GAS SECTION Fig. 8 Ð Thermistor T1 Location, 50FK,JK034-048 UnitsHORIZONTAL SUPPLY SECTION 48FK,JK ONLY50JKX,JKY 054-074 Units and 50FKX,FKY and 50FY054-104 Units Fig. 9 Ð Thermistor T1 Location, 48FK,JK, 50JY andFig. 10 Ð Thermistor T1 Location, 50FK,JK054-074 Units GAS SECTIONFig. 12 Ð Thermistor T2 Location, Size 054-104 Units Fig. 11 Ð Thermistor T2 Location, Size 034-048 UnitsFig. 13 Ð Thermistor T3 and T4 Locations Size 034-048 Units STANDARD054 UNITS 064, 074, 078 UNITS 088, 104 UNITS Fig. 14 Ð Thermistor T3 and T4 Locations, Size 054-104 UnitsFig. 16 Ð Two-Step Demand Limit Module Fig. 15 Ð Accessory Relay Board Standard Factory SuppliedFig. 17 Ð Enthalpy Sensor Location Fig. 18 Ð Variable Frequency Drive Sizes 034-048 andSpace 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. 25 Ð Accessory Reset Board Fig. 23 Ð Occupied/Unoccupied Switch with Night Setback ThermostatVoltage Drop Characteristics Fig. 24 Ð Heat Interlock RelayFig. 26 Ð Space Temperature Sensor Averaging Fig. 27 Ð Single-Step Demand Limit Fig. 29 Ð 115-Volt Field Wiring to AccessoryFig. 28 Ð Two-Step Demand Limit Module 2-Step Demand Limit Control ModuleThis emulation requires the following eld-supplied parts Fig. 31 Ð External Alarm Indication Fig. 30 Ð Remote SASP WiringP Ð Manual Potentiometer R Ð Fixed Resistor Field Wiring R Ð Resistor Factory Installed Factory Wiring Field WiringModulating Power Table 6 Ð Smoke Control Switches Required for Each ModeTable 5 Ð Smoke Control Modes FireModulating Power Exhaust Table 7 Ð Switch FunctionsTable 8 Ð Tubing Size SIZE inFig. 32 Ð Smoke Control Wiring 034-048 UNITSALL UNITS Guide Vane Differential Pressure Switch Sizes Fig. 33 Ð Modulating Power Exhaust and InletPressure Switch and Variable Frequency Drive Fig. 35 Ð Modulating Power Exhaust Differential Pressure Switch SizesTable 10 Ð Conguration Header and DIP Switch Factory Settings Table 9 Ð Potentiometer Inputs and RangesTable 11 Ð Conguration Header Jumpers Table 12 Ð DIP Switches Fig. 37 Ð Inlet Guide Vane Motor, 48FK,JK, 50FY,JY Fig. 36 Ð Inlet Guide Vane Motor 50FK,JK034-074 Unitsand 50FJX,FJY,FKX,FKY034-074 Units Fig. 38 Ð Inlet Guide Vane Motor Size 078-104 UnitsFig. 39 Ð Differential Pressure Switch for Inlet Guide READ STOP WRITE RESETModulating Power Exhaust Option Fig. 41 Ð Jumper Removal to Disable MotorModulating Power Exhaust Option or Acces Table 13 Ð VFD Set Point Frequency Command for Duct PressureTable 14 Ð Changing the VFD Set Point Frequency Command START UNIT CONTROL SWITCH Table 15 Ð Quick Test, Unit Conguration and Switch CheckQUICK NORMALTable 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 Fig. 42 Ð Component Arrangement, 034-048 Units 034 AND 038 UNITS044 AND 048 UNITS 054, 064 UNITS Fig. 43 Ð Component Arrangement, 054-104 Units074, 078 UNITS 088, 104 UNITS 104 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 TROUBLESHOOTING Table 20 Ð Controls TroubleshootingTable 21 Ð Operation Status Codes Table 22 Ð Diagnostic Codes 82 to be displayed on display board when display button is · Wiring Problem Ð If the circuit is open, a failure will be detectedwill be energized and an error code of 82 will be displayed ergize alarm light and cause an error code of 83 to be disPage Fig. 49 Ð Relay Board Test Points Fig. 48 Ð Processor Board Test PointsFig. 50 Ð Relay Board Pin Terminal Connector J9 Fig. 51 Ð Display Board Pin Terminal Connector J10Table 23 Ð Voltage Reading Table 25 Ð Pin Terminal Connector J2 Voltages Table 24 Ð Pin Terminal Connector J1 VoltagesStep 1 Ð Low-voltage relay resistance check Step 2 Ð High-voltage relay resistance checkTable 28 Ð Enthalpy Sensor Checkout Table 27 Ð Terminal Strip J5 Connector Resistance ReadingFig. 52 Ð Damper Motor Connection Diagram VAV 1. Disconnect all power to the unit and the VFDVariable Frequency Drive Frequency Settings Table 29 Ð Carrier Default Program Parameter ValuesGr.Fb Gr.SFTable 31 Ð Motor Overload Settings Table 30 Ð Required User Adjusted DefaultsFig. 53 Ð Variable Frequency Drive Terminal Block Size 034-048 Units Fig. 54 Ð Variable Frequency Drive Terminal Block Size 054-104 UnitsLEGEND AND NOTES FOR FIG Page Page CALL FOR FREE CATALOG SERVICE TRAININGII. PRELIMINARY CHECKLIST ITEMS START-UP CHECKLISTCONTROL SETTINGS I. PRE-START-UPIII. START-UP TEMPERATURESIV. NOTES ELECTRICAL