Manuals / Carrier / Household Appliance / Air Conditioner

Carrier JK034-074, 50FK, 48FK Ð Processor Board, Ð Pin Terminal Connector J1 Thermistor Inputs

Models: 48FK 50FK JK034-074

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Fig. 1 Ð Processor Board

		LEGEND
DIP	Ð	Dual In-Line Package
EPROM Ð Erasable, Programmable Read-Only Memory
EXV	Ð	Electronic Expansion Valve

Do not remove label covering EPROM. Removal causes pro- gram to be erased.

*EPROM HT204485-1-XX where ``XX'' is the current revision number.

NOTE: Processor Board is positioned in unit with J3 and J10 con- nections at the bottom.

Fig. 1 Ð Processor Board

Several temperature inputs are connected to the proces- sor. There are either 4 or 5 thermistors (depending on the ®eld-installed accessories) which input temperature data into the processor through pin terminal connector J1. See Table 1 and Fig. 2.

Several status switches are also monitored. These switches are connected to the processor at pin terminal connector J2. See Fig. 3 and Table 2.

Table 1 Ð Pin Terminal Connector J1

Thermistor Inputs

	CONNECTOR J1	TEMPERATURE	UNIT SIZE
	TERMINAL NO.	INPUT	034-104
	1,2	Reset Temperature*	T10
	14,15	Saturated Condensing	T4
	14,15	Temp., Circuit 2	T4
		Temp., Circuit 2
	16,17	Saturated Condensing	T3
	16,17	Temp., Circuit 1	T3
		Temp., Circuit 1
	18,19	Return-Air Temperature	T2
	20,21	Supply-Air Temperature	T1

LEGEND

T Ð Thermistor

*If equipped with accessory temperature reset package. NOTE: Terminal numbers 3-13 are not used on these units.

In addition to the unit status switch inputs, the processor board also accepts inputs from several potentiometers. These potentiometers control various operational characteristics of the system. Inputs are received by the processor through pin terminal connector J3. See Fig. 4.

All of the potentiometers must be set before the unit is started in order for the unit to function properly. See Start- Up, Potentiometers section on page 28 for information on establishing set points. Each of the potentiometers has a valid range that is used by the control. The valid range is de®ned as the potentiometer's resistance value that the control will not consider to be in error. This is usually between 10% and 90% of the potentiometer's total resistance. The control has been programmed to accept an operational range for the po- tentiometer, which may not be the same as the valid range.

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Carrier JK034-074, 50FK, 48FK Ð Processor Board, Ð Pin Terminal Connector J1 Thermistor Inputs, Return-Air Temperature

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 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 SizeFig. 32 Ð Smoke Control Wiring 034-048 UNITSALL 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 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 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 OptionModulating 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 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 Fig. 42 Ð Component Arrangement, 034-048 Units 034 AND 038 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 TROUBLESHOOTING Table 20 Ð Controls 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. 50 Ð Relay Board Pin Terminal Connector J9 Fig. 51 Ð Display Board Pin Terminal Connector J10Table 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 ReadingFig. 52 Ð Damper Motor Connection Diagram VAV 1. Disconnect all power to the unit and the VFDVariable 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