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Carrier 50FK, JK034-074, 48FK specifications Legend And Notes For Fig

Models: 48FK 50FK JK034-074

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LEGEND AND NOTES FOR FIG. 55

LEGEND AND NOTES FOR FIG. 55

ALM	Ð Alarm	LAT	Ð Leaving-Air Temperature
C	Ð Contactor	LPS	Ð Low-Pressure Switch
CB	Ð Circuit Breaker	MTR	Ð Motor
CCB	Ð Control Circuit Breaker	MV	Ð Main Valve
COMP	Ð Compressor	NC	Ð Normally Closed
CH	Ð Crankcase Heater	NO	Ð Normally Open
CR	Ð Control Relay	OFC	Ð Outdoor Fan Contactor
DPS	Ð Differential Pressure Switch	OFM	Ð Outdoor (Condenser) Fan Motor
DPT	Ð Discharge Pressure Transducer	OMR	Ð Outdoor Motor Relay
EAT	Ð Enering-Air Temperature	PCB	Ð Power Exhaust Circuit Breaker
EC	Ð Enthalpy Control	PEC	Ð Power Exhaust Contactor
ECR	Ð Economizer Close Relay	PEDM Ð Power Exhaust Damper Motor
EOR	Ð Economizer Open Relay	PEM	Ð Power Exhaust Motor
EQUIP	Ð Equipment	P, PL	Ð Plug
FS	Ð Fan Status Switch	RCB	Ð Return Fan Circuit Breaker
GND	Ð Ground	RES	Ð Resistor
HIR	Ð Heat Interlock Relay	RFC	Ð Return Fan Contactror
HPS	Ð High-Pressure Switch	RFM	Ð Return Fan Motor
HR	Ð Heater Relay	SCT	Ð Saturated Condensing Thermistor
HTR	Ð Heater	TB	Ð Terminal Block
IDC	Ð Induced Draft Contactor	TRAN	Ð Transformer
IDM	Ð Induced Draft Motor	U	Ð Unloader
IFC	Ð Indoor (Evaporator) Fan Contactor	VFD	Ð Variable Frequence Drive
IFCB	Ð Indoor Fan Circuit Breaker		Field Wiring
IGV	Ð Inlet Guide Vanes		Field Wiring
IGV	Ð Inlet Guide Vanes		Factory Wiring
IGVM	Ð Inlet Guide Vanes Motor		Factory Wiring

NOTES:

1. Connect TRAN1 to H4 for 460 v units. Connect to H3 for 230 v units. If 208/230 v units are run with a 208 v power supply connect to H2 .

2.Connect TRAN2 to BLK lead for 460 v units. Connect to ORN lead for 230 v units. If 208/230 v units are run with a 208 v power sup- ply connect to RED lead.

3.Circuit breaker must trip amps are equal to or less than 156% FLA (full load amps) for CB1 and CB2. All others are 140%.

4.If any of the original wire furnished must be replaced, it must be replaced with type 90° C wire or its equivalent.

5.Number(s) indicates the line location of contacts. A bracket over

(2) numbers signi®es single pole double throw contacts. An un- derlined number signi®es a normally closed contact. Plain num- bers (no lines), signify a normally opened contact.

6.Condenser fan motors are thermally protected.

7.Three phase motors are protected under primary single phasing conditions.

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Carrier 50FK, JK034-074, 48FK specifications Legend And Notes For Fig

Contents

48FK,JK034-074 50FK,FY,JK,JY034-104 Variable-Air Volume Rooftop Units Controls Operation and TroubleshootingSAFETY CONSIDERATIONS CONTENTS contGENERAL Return-Air Temperature Table 1 Ð Pin Terminal Connector J1 Thermistor InputsFig. 1 Ð Processor Board 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 Size034-048 UNITS Fig. 32 Ð Smoke Control WiringALL 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 9 Ð Potentiometer Inputs and Ranges Table 10 Ð Conguration Header and DIP Switch Factory SettingsTable 11 Ð Conguration Header Jumpers 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 13 Ð VFD Set Point Frequency Command for Duct Pressure Modulating Power Exhaust Option or AccesTable 14 Ð Changing the VFD Set Point Frequency Command 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 034 AND 038 UNITS Fig. 42 Ð Component Arrangement, 034-048 Units044 AND 048 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 20 Ð Controls Troubleshooting TROUBLESHOOTINGTable 21 Ð Operation Status Codes 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 PointsFig. 51 Ð Display Board Pin Terminal Connector J10 Fig. 50 Ð Relay Board Pin Terminal Connector J9Table 23 Ð Voltage Reading 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 Reading1. Disconnect all power to the unit and the VFD Fig. 52 Ð Damper Motor Connection Diagram VAVVariable Frequency Drive 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