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Carrier 48FK Ð Quick Test, Unit Conguration and Switch Check, Normal, Description, Control Switch

Models: 48FK 50FK JK034-074

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Table 15 Ð Quick Test, Unit Con®guration and Switch Check

Table 15 Ð Quick Test, Unit Con®guration and Switch Check

	QUICK				NORMAL				DESCRIPTION	CONTROL SWITCH
	TEST				DISPLAY
	STEP NO.

	1.
	1.					01		Type Unit Ð Air-Cooled VAV		Con®guration Header

	2.					2		No. of Compressors		Con®guration Header

	3.							No. of Unloaders		DIP Switch No. 6 and 7
						2		(034,038,048-088)
						1		(044, 104)

	4.
	4.					60		60-Hertz Power		Con®guration Header

	5.				0	or	1	0	Ð No Reset (Switch Off)	DIP Switch No. 2
								1	Ð Reset On (Switch On)

	6.				0	or	1	0	Ð No Economizer (Switch Off)	DIP Switch No. 3
								1	Ð Economizer On (Switch On)

	7.				0	or	1	0	Ð No Warm-Up (Switch Off)	DIP Switch No. 4
								1	Ð Warm-Up Used (Switch On)

	8.				0	or	1	0	Ð Demand Limit Not Used	DIP Switch No. 5
									(Switch Off)
								1	Ð Demand Limit Used
									(Switch On)

	9.				0	or	1	0	Ð Enthalpy Switch Open	EC
								1	Ð Enthalpy Switch Closed

								1	Ð Low-Pressure Switch Closed	Low-Pressure Switch 1
		1.0.				1		1	Ð Low-Pressure Switch Closed	Low-Pressure Switch 1

								1	Ð Low-Pressure Switch Closed	Low-Pressure Switch 2
		1.1.				1		1	Ð Low-Pressure Switch Closed	Low-Pressure Switch 2



		1.2.				1		No Circuit 1 Oil Pressure Switch		None*


		1.3.				1		No Circuit 2 Oil Pressure Switch		None*

	LEGEND
DIP	Ð Dual, In-Line Package
EC	Ð Enthlapy Control

VAV Ð Variable Air Volume

*Units are not equipped with oil pressure switches.

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Carrier 48FK, 50FK Ð Quick Test, Unit Conguration and Switch Check, Normal, Description, Control Switch, Display, Step No

Contents

Controls Operation and Troubleshooting 48FK,JK034-074 50FK,FY,JK,JY034-104 Variable-Air Volume Rooftop UnitsGENERAL CONTENTS contSAFETY CONSIDERATIONS Fig. 1 Ð Processor Board Table 1 Ð Pin Terminal Connector J1 Thermistor InputsReturn-Air Temperature Fig. 3 Ð Pin Terminal Connector J2 Status Switch InputsFig. 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 Table 3 Ð Output Pin and Terminal Assignments Fig. 5 Ð Relay BoardCompressor Operation Fig. 8 Ð Thermistor T1 Location, 50FK,JK034-048 Units GAS SECTIONHORIZONTAL SUPPLY SECTION 48FK,JK ONLYFig. 9 Ð Thermistor T1 Location, 48FK,JK, 50JY and 50JKX,JKY 054-074 Units and 50FKX,FKY and 50FY054-104 UnitsFig. 10 Ð Thermistor T1 Location, 50FK,JK054-074 Units GAS SECTIONFig. 11 Ð Thermistor T2 Location, Size 034-048 Units Fig. 12 Ð Thermistor T2 Location, Size 054-104 UnitsFig. 13 Ð Thermistor T3 and T4 Locations Size 034-048 Units STANDARDFig. 14 Ð Thermistor T3 and T4 Locations, Size 054-104 Units 054 UNITS 064, 074, 078 UNITS 088, 104 UNITSFig. 15 Ð Accessory Relay Board Standard Factory Supplied Fig. 16 Ð Two-Step Demand Limit ModuleFig. 17 Ð Enthalpy Sensor Location Fig. 18 Ð Variable Frequency Drive Sizes 034-048 andCONTROLS INSTALLATION Space Temperature ResetFig. 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. 23 Ð Occupied/Unoccupied Switch with Night Setback Thermostat Fig. 25 Ð Accessory Reset BoardVoltage Drop Characteristics Fig. 24 Ð Heat Interlock RelayFig. 26 Ð Space Temperature Sensor Averaging Fig. 29 Ð 115-Volt Field Wiring to Accessory Fig. 27 Ð Single-Step Demand LimitFig. 28 Ð Two-Step Demand Limit Module 2-Step Demand Limit Control ModuleThis emulation requires the following eld-supplied parts Fig. 30 Ð Remote SASP Wiring Fig. 31 Ð External Alarm IndicationP Ð Manual Potentiometer R Ð Fixed Resistor Field Wiring R Ð Resistor Factory Installed Factory Wiring Field WiringTable 6 Ð Smoke Control Switches Required for Each Mode Modulating PowerTable 5 Ð Smoke Control Modes FireTable 7 Ð Switch Functions Modulating Power ExhaustTable 8 Ð Tubing Size SIZE inALL UNITS Fig. 32 Ð Smoke Control Wiring034-048 UNITS Fig. 33 Ð Modulating Power Exhaust and Inlet Guide Vane Differential Pressure Switch SizesPressure Switch and Variable Frequency Drive Fig. 35 Ð Modulating Power Exhaust Differential Pressure Switch SizesTable 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 Fig. 36 Ð Inlet Guide Vane Motor 50FK,JK034-074 Units Fig. 37 Ð Inlet Guide Vane Motor, 48FK,JK, 50FY,JYand 50FJX,FJY,FKX,FKY034-074 Units Fig. 38 Ð Inlet Guide Vane Motor Size 078-104 UnitsREAD STOP WRITE RESET Fig. 39 Ð Differential Pressure Switch for Inlet GuideModulating Power Exhaust Option Fig. 41 Ð Jumper Removal to Disable MotorTable 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 Table 15 Ð Quick Test, Unit Conguration and Switch Check CONTROL SWITCHQUICK NORMALTable 16 Ð Quick Test, Thermistor and Potentiometer Check Table 17 Ð Quick Test, Output Relay CheckOPERATING INFORMATION Table 18 Ð Sensor Resistance Valueswarm-up routine, and a 26 will be displayed 044 AND 048 UNITS Fig. 42 Ð Component Arrangement, 034-048 Units034 AND 038 UNITS Fig. 43 Ð Component Arrangement, 054-104 Units 054, 064 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 Table 21 Ð Operation Status Codes TROUBLESHOOTINGTable 20 Ð Controls Troubleshooting Table 22 Ð Diagnostic Codes · Wiring Problem Ð If the circuit is open, a failure will be detected 82 to be displayed on display board when display button iswill 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. 48 Ð Processor Board Test Points Fig. 49 Ð Relay Board Test PointsTable 23 Ð Voltage Reading Fig. 50 Ð Relay Board Pin Terminal Connector J9Fig. 51 Ð Display Board Pin Terminal Connector J10 Table 24 Ð Pin Terminal Connector J1 Voltages Table 25 Ð Pin Terminal Connector J2 VoltagesStep 1 Ð Low-voltage relay resistance check Step 2 Ð High-voltage relay resistance checkTable 27 Ð Terminal Strip J5 Connector Resistance Reading Table 28 Ð Enthalpy Sensor CheckoutVariable Frequency Drive Fig. 52 Ð Damper Motor Connection Diagram VAV1. Disconnect all power to the unit and the VFD Table 29 Ð Carrier Default Program Parameter Values Frequency SettingsGr.Fb Gr.SFTable 30 Ð Required User Adjusted Defaults Table 31 Ð Motor Overload SettingsFig. 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 SERVICE TRAINING CALL FOR FREE CATALOGSTART-UP CHECKLIST II. PRELIMINARY CHECKLIST ITEMSCONTROL SETTINGS I. PRE-START-UPTEMPERATURES III. START-UPIV. NOTES ELECTRICAL