Carrier JK034-074, 50FK, 48FK specifications Compressor Loading and Unloading Sequences

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Table 19 Ð Compressor Loading and Unloading Sequences

				SIZE 034 UNITS
COOLING		Lead Circuit			Lag Circuit	Active	Percent
STAGE	Comp 1	Unloader	Unloader		Comp 2	Cylinders	Capacity
	Comp 1	U1	U2		Comp 2	Cylinders	Capacity
		U1	U2
0	OFF	OFF	OFF		OFF	0	0
1	ON	ON	ON		OFF	2	17
2	ON	ON	OFF		OFF	4	33
3	ON	OFF	OFF		OFF	6	50
4	ON	ON	ON		ON	8	67
5	ON	ON	OFF		ON	10	83
6	ON	OFF	OFF		ON	12	100

				SIZE 038 UNITS
COOLING		Lead Circuit			Lag Circuit	Active	Percent
STAGE						Active	Percent
STAGE	Comp 1	Unloader	Unloader		Comp 2	Cylinders	Capacity
	Comp 1	U1	U2		Comp 2	Cylinders	Capacity
		U1	U2
0	OFF	OFF	OFF		OFF	0	0
1	ON	ON	ON		OFF	2	14
2	ON	ON	OFF		OFF	4	28
3	ON	OFF	OFF		OFF	6	42
4	ON	ON	ON		ON	6	72
5	ON	ON	OFF		ON	8	86
6	ON	OFF	OFF		ON	10	100

				SIZE 044 UNITS
COOLING		Lead Circuit		Lag Circuit	Active	Percent
STAGE					Active	Percent
STAGE	Comp 1		Unloader	Comp 2	Cylinders	Capacity
	Comp 1		U1	Comp 2	Cylinders	Capacity
			U1
0	OFF		OFF	OFF	0	0
1	ON		ON	OFF	2	25
2	ON		OFF	OFF	4	50
3	ON		ON	ON	6	75
4	ON		OFF	ON	8	100

				SIZE 048 UNITS
COOLING		Lead Circuit			Lag Circuit	Active	Percent
STAGE						Active	Percent
STAGE	Comp 1	Unloader	Unloader		Comp 2	Cylinders	Capacity
	Comp 1	U1	U2		Comp 2	Cylinders	Capacity
		U1	U2
0	OFF	OFF	OFF		OFF	0	0
1	ON	ON	ON		OFF	2	19
2	ON	ON	OFF		OFF	4	38
3	ON	OFF	OFF		OFF	6	58
4	ON	ON	ON		ON	6	62
5	ON	ON	OFF		ON	8	81
6	ON	OFF	OFF		ON	10	100

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Contents Controls Operation Troubleshooting ContentsSafety Considerations GeneralDIP Pin Terminal Connector J1 Thermistor InputsConnector J1 Temperature Unit Size Terminal no Input EXV034-104 Status Switch InputsConnector J2 Status Switch Unit Size Terminal no RNT Ð ReturnPage HIR Output Pin and Terminal AssignmentsOutput PIN Name Rating Device Terminal IFCCompressor Operation Thermistor T1 Location, 50FK,JK034-048 Units Thermistor T1 Location, 50FK,JK054-074 Units Thermistor T2 Location, Size 034-048 Units Thermistor T3 and T4 Locations, Size 054-104 Units Integrated Circuit InputControls Installation Space Temperature ResetUnit Control Box Arrangement, Sizes Unit Control Box Arrangement, Sizes Unit Control Box Arrangement, Sizes 088 Voltage Drop Characteristics Thermistor ResistanceSpace Temperature Sensor Averaging Single-Step Demand Limit MSP = Sasp + Remote Sasp Wiring Smoke Control Switches Required for Each Mode Smoke Control ModesSwitch Functions Tubing SizeDPS Ð Differential Pressure Switch SwitchTerminal Block Modulating Power Exhaust Differential Pressure Switch Sizes START-UPConguration Header DIP Switch Factory Settings Potentiometer Inputs and RangesConguration Header Jumpers DIP Switches Switch Function Meaning PositionInlet Guide Vane Motor 50FK,JK034-074 Units Jumper Removal to Disable Motor Variable Frequency Drive KeypadControl Signal Pressure VFD SET Point VFD Set Point Frequency Command for Duct PressureChanging the VFD Set Point Frequency Command PressureStart Unit Quick Test, Unit Conguration and Switch Check Quick Normal Description Control Switch Test Display Step noQuick Normal Description Thermistor or Test Quick Test, Thermistor and Potentiometer CheckQuick Test, Output Relay Check Quick Normal Test Description Relay NumberOperating Information Sensor Resistance ValuesPage Component Arrangement, 034-048 Units Component Arrangement, 054-104 Units Page Modulating Power Exhaust Component Locations Sizes Modulating Power Exhaust Component Locations Sizes Page Compressor Loading and Unloading Sequences Cooling Size 088 Units Cooling Size 054 UnitsCooling Size 064 Units Cooling Size 104 UnitsSymptoms Probable Causes Solutions TroubleshootingControls Troubleshooting Operation Status CodesDiagnostic Codes Codes 71 to 76 THERMISTOR/RESISTOR Failure Page TP4 Terminals Voltage ACTest PIN Voltage DC TP3 TP6Quick Test J9 PIN Numbers Step no PIN Terminal Voltage DCTerminal Strip J6 Connection Resistance Reading Pin Terminal Connector J1 VoltagesPin Terminal Connector J2 Voltages PIN Voltage TerminalTerminal Strip J5 Connector Resistance Reading Enthalpy Sensor CheckoutQuick Test J5 PIN Numbers Step no Variable Frequency Drive Carrier Default Program Parameter Values Parameter Group Default ValueRequired User Adjusted Defaults Motor Overload SettingsLPS ALMLAT MTRPage Page Service Training Call for Free CatalogII. Preliminary Checklist Items PRE-START-UPIII. START-UP IV. Notes