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Carrier 48/50AJ specifications Cooling Service Analysis cont

Models: 48/50AJ

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Table 94 — Cooling Service Analysis (cont)

	PROBLEM		SOLUTION
COMPRESSOR RUNNING BUT COOLING INSUFFICIENT
Suction Pressure Low
1.	Refrigerant charge low.	1.	Add refrigerant.
2.	Head pressure low.	2.	Check refrigerant charge.
3.	Air filters dirty.	3.	Clean or replace filters.
4.	Expansion valve power head defective.	4.	Replace power head.
5.	Indoor coil partially iced.	5.	Check low-pressure setting.
6.	Indoor airflow restricted.	6.	Remove obstruction.
Suction Pressure High
Heat load excessive.		Check for open doors or windows.
UNIT OPERATES TOO LONG OR CONTINUOUSLY
1.	Low refrigerant charge.	1.	Add refrigerant
2.	Control contacts fused.	2.	Replace control.
3.	Air in system.	3.	Purge and evacuate system.
4.	Partially plugged expansion valve or filter drier.	4.	Clean or replace.
SYSTEM IS NOISY
1.	Piping vibration.	1.	Support piping as required.
2.	Compressor noisy.	2.	Replace compressor.
COMPRESSOR LOSES OIL
1.	Leak in system.	1.	Repair leak.
2.	Crankcase heaters not energized during shutdown.	2.	Check wiring and relays. Check heater and replace if defective.
FROSTED SUCTION LINE
Expansion valve admitting excess refrigerant.		Adjust expansion valve.
HOT LIQUID LINE
1.	Shortage of refrigerant due to leak.	1.	Repair leak and recharge.
2.	Expansion valve opens too wide.	2.	Adjust expansion valve.
FROSTED LIQUID LINE
Restricted filter drier.		Remove restriction or replace.
INDOOR FAN CONTACTOR OPEN
1.	Power off.	1.	Restore power.
2.	Fuses blown in field power circuit.	2.	After finding cause and correcting, replace with correct fuses.
3.	No control power.	3.	Check secondary fuses. Replace with correct type and size.
			Replace transformer if primary windings are receiving power.
INDOOR FAN CONTACTOR CLOSED
1.	VFD overload function tripped.	1.	Refer to separate VFD technical manual for troubleshooting
2.	Motor leads loose.		instructions.
2.	Motor leads loose.	2.	Check connections at motor lead junction box.
3.	Motor windings open.	3.	Check motor windings.
4.	Single phasing.	4.	Check for blown fuse. Check for loose connections at motor
5.	Belts broken or thrown.		junction box.
5.	Belts broken or thrown.	5.	Check belts. Replace as complete set if necessary.
6.	Circuit breaker tripped.	6.	Check for excessive current draw. Reset breaker. Replace if
			defective.
	LEGEND
ASTP — Advanced Scroll Temperature Protection
VFD — Variable Frequency Drive

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Image 79

Carrier 48/50AJ specifications Cooling Service Analysis cont

Contents

Two-StageConstant Volume Units with CONTENTSMulti-StageConstant Volume Units with APPENDIX D - MODE SELECTION CONTENTS contSAFETY CONSIDERATIONS APPENDIX A — LOCAL DISPLAY TABLES . . . .BASIC CONTROL USAGE GENERALTable 1 — A Series Product Line Fig. 1 — Scrolling Marquee Fig. 2 — Accessory Navigator DisplayFig. 3 — System Pilot User Interface ComfortLink Display Modes START-UP AIRFLOW Table 6 — Fan Performance — 48AJ,AK036 Units Table 8 — Fan Performance — 48AJ,AK041 Units Table 10 — Fan Performance — 48AJ,AK051 Units AIRFLOW AIRFLOW Table 15 — Fan Performance — 50AJ,AK036 Units Table 17 — Fan Performance — 50AJ,AK041 Units Table 19 — Fan Performance — 50AJ,AK051 Units AIRFLOW CFM 4,000 5,000 6,000 7,000 7,500 8,000 Table 24 — Fan Performance — 48AW,AY036 Units Table 26 - Fan Performance - 48AW,AY041 Units Table 28 — Fan Performance — 48AW,AY051 Units 4.81 0.62 Table 33 — Fan Performance — 50AW,AY036 Units Table 35 — Fan Performance — 50AW,AY041 Units Table 37 - Fan Performance - 50AW,AY051 Units Table 39 — Motor Limitations CONTROLS QUICK START figure the unit, perform the following Indoor Air Quality IAQ Options SERVICE TESTFans in Service Test Mode — Upon entering the Demand Controlled Ventilation Control — THIRD PARTY CONTROLCONTROLS OPERATION SYSTEM MODES Operating Modes→SYS.M Table 42 — Operating Modes Display TableSmoke Fig. 4 — Mode SelectionFire SystemC.TYP = 1 VAV-RATand C.TYP = 2 VAV-SPT MAT.S = Table 43 — Unit Configuration•MAT.S = •MAT.S =under Configuration→UNIT Table 45 — Setpoints Table 44 - Machine Dependent ConfigurationsTable 46 — Supply Air Reset Configuration →SA.S.RTable 47 — Cooling Configuration Time After Compressor is Stopped Fig. 5 — Advanced Scroll TemperatureProtection Label Fig. 6 — Recommended Minimum Cool-DownFig. 8 — Cool Mode Evaluation •Lo Cool Mode mechanical stages = Table 50 — 2-StageSequence — 48/50AJ,AW030-060 Table 49 — 2-StageSequence — 48/50AJ,AW020-027Table 56 — 2-StageSequence — 48/50A2,A4030-060 Table 55 — 2-StageSequence — 48/50A2,A4020-027STAGE R.PCT = MAT – EDT/ C.CAP Z.MIN = Configuration→COOL→Z.GN * –10+Z.PLU = Configuration→COOL→Z.GN * 10 + Table 61 - Run Status Mode Trip HelperTable 62 — Run Status Cool Display •MAT.S = Inputs→GEN.I→DL.S1 Inputs→GEN.I→DL.S2•MAT.S = •MAT.S =•Configuration→COOL→M.M. – Motor Master Control? Table 63 - Demand Limit ConfigurationEC.C.P = Setpoints→SA.LO + Inputs→RSET→SA.S.R Table 64 — Condenser Fan StagingTable 65 — Heating Configuration Table 66 — Heat/Cool Set Point Offsets Fig. 9 — Heating OffsetsTable 67 — Mode Trip Helper Table Error = HT.C.P – LATTable 69A — Staged Gas Heat — 48AJ,AK,AW,AY Units Table 68 — Staged Gas ConfigurationTable 69B — Staged Gas Heat — 48A2,A3,A4,A5 Units Table 74 — IGC LED Indicators •For all other cases, the trip point is T.V.UN Table 75 — Static Pressure Control Configuration Fan Status Monitoring Table 77 - Fan Status Monitoring Configuration Table 76 — Static Pressure Reset Related PointsTable 78 - Dirty Filter Switch Points Enthalpy Control Fig. 10 — Psychrometric Chart forInputs→GEN.I→E.SW E.SEL =Fig. 11 — Custom Changeover Curve Example Table 79 — Economizer Configuration TableC.TYP = C.TYP =C.TYP = C.TYP =Table 80 — Economizer Run Status Table Table 82 — Power Exhaust Staging BP.CF = Table 81 — Building Pressure ConfigurationTable 83 — Power Exhaust Staging BP.CF = RELEVANT ITEMS Fig. 13 — IAQ Response Curve Point Configuration→IAQ→AQ.SP→D.F.ON. The fanPoint Configuration→IAQ→AQ.SP→D.F.OF. The con Fig. 12 — IAQ ControlIAQ Purge Configuration → IAQ → IAQ.P → IQ.PG— Table 85 — Dehumidification Configuration Table 84 - Indoor Air Quality ConfigurationCarrier Comfort Network CCN System - It Temperature Compensated Start — This logic isTable 86 — CCN Configuration Table 88 - Sensor Trim Configuration Table 87 — Alert Limit ConfigurationDiscrete Switch Logic Configuration — The SW.LG TIME CLOCK CONFIGURATION Table 92 — Remote Switch Logic Configuration TROUBLESHOOTING Table 94 — Cooling Service Analysis Table 94 — Cooling Service Analysis cont Table 96 — Electric Heat Service Analysis Table 95 — Gas Heating Service AnalysisA48-5656 Fig. 14 — IGC Service Analysis LogicTEMP TEMP TEMP 48/50AJ,AK,AW,AY Units Only 48/50AJ,AK,AW,AY Units Only PRESSURE 48/50A2,A3,A4,A5 Units Only 48/50A2,A3,A4,A5 Units Only cont Y.MIN = -SUB.R*0.4375 R.PCT = MAT - EDT/C.CAPY.PLU = –ADD.R*0.4375 Z.PLU = Configuration→COOL→Z.GN * 10 + Table 105 — Auto View of Run Status Display TableTable 106 - Economizer Run Status Display Table Z.MIN = Configuration→COOL→Z.GN * –10+Table 110 — Compressor Run Hours Display Table Table 107 — Cooling Information Display TableTable 108 — Mode Trip Helper Display Table Table 109 — CCN/Linkage Display TableTable 112 — Time Guard Display Table Table 114 — Alert and Alarm Codes Table 114 — Alert and Alarm Codes cont A051 Circuit A, Compressor 1 Stuck On Failure T092 Circuit A Suction Pressure Transducer Failure Demand Limit Select Configuration→DMD.L→DM.L.S T303 Supply Temperature Above Limit— If the supply at Configuration→UNIT→SENS→FLT.S MAJOR SYSTEM COMPONENTS Factory-InstalledComponentsa48-8355 RED JUMPER WIRE MUST BE ADDED~ ~ ~ ~ ~ ~~ TO NEXT PAGEa48-8355 a48-8355 ~ TO NEXT ~PAGE ~ ~ ~ ~ ~ ~ ~~ ~~ ~~ A48-7294a48-8356 ~~~~a48--8357 A48-7296 TO NEXT PAGEA48-8358 a50-8228 TO NEXT PAGE A48-7298a48-8360 FROM PREVIOUS PAGEPage a48-8361 SW1 SW2 OR DEHUMIDIFY SWITCHa48-8362 A48-7302 LEGEND LEGEND AND NOTES FOR FIG.A48-7811 Fig. 26 — Main Base Board MBBPOINT A48-7707 Fig. 28 — Staged Gas Heat Control Board SCBTEST Fig. 29 — Controls Expansion Board CEMCEPL130351 CEBD430351Table 120 — IGC Board Inputs and Outputs Table 119 — Controls Expansion Board CEM InputsFig. 30 — Scrolling Marquee Table 121 — VFD Terminal Designations Fig. 31 — VFD WiringTB5 TB6 W2 GTable 122 — Field Connection Terminal Strips Fig. 34 — Accessory Navigator Display Fig. 35 — CCN System Architecture Fig. 38 — Typical Gas Heating Section SERVICEFig. 37 - Spark Gap Adjustment Fig. 36 — Door LatchFig. 39 — Gas Heat Section Details Lubrication Fig. 40 — Evaporator-FanAlignment and AdjustmentFig. 42 — Belt Tension Adjustment Evaporator Fan Service and ReplacementBelt Tension Adjustment — To adjust belt tension Evaporator-FanMotor ReplacementTable 123 - Round Tube, Plate Fin Unit Charge Condenser-FanAdjustmentGas Valve Adjustment Fig. 43 — Condenser-FanAdjustmenta48-8401 25 and 27 Ton MCHX CIRCUIT A Charging Chart a48-840225 and 27 Ton MCHX CIRCUIT B Charging Chart 30 Ton MCHX CIRCUIT B Charging Chart 30 Ton MCHX CIRCUIT A Charging Chart35 Ton MCHX CIRCUIT B Charging Chart 35 Ton MCHX CIRCUIT A Charging Chart50 Ton MCHX Charging Chart 40 Ton MCHX Charging Chart60 Ton MCHX CIRCUIT B Charging Chart 60 Ton MCHX CIRCUIT A Charging ChartFig. 52 — Main Burner Removal Fig. 51 — Gas Valve Part Number EF33CW271MODE — RUN STATUS APPENDIX A — LOCAL DISPLAY TABLESMODE — RUN STATUS cont APPENDIX A - LOCAL DISPLAY TABLES contMODE — SERVICE TEST MODE — TEMPERATURESMODE — INPUTS APPENDIX A — LOCAL DISPLAY TABLES contMODE — PRESSURES MODE — SET POINTSMODE — OUTPUTS MODE — CONFIGURATIONAPPENDIX A — LOCAL DISPLAY TABLES cont MODE — INPUTS contITEM MODE - CONFIGURATION contDEFAULT APPENDIX A — LOCAL DISPLAY TABLES cont→BP.CF APPENDIX A — LOCAL DISPLAY TABLES cont→CCNA APPENDIX A — LOCAL DISPLAY TABLES contMODE - OPERATING MODES MODE — ALARMSAPPENDIX A — LOCAL DISPLAY TABLES cont MODE — TIME CLOCKSTATUS DISPLAY TABLES APPENDIX B — CCN TABLESSTATUS DISPLAY TABLES cont APPENDIX B - CCN TABLES contSTATUS DISPLAY TABLES cont APPENDIX B — CCN TABLES contTABLE SET POINT TABLE CONFIG TABLESAPPENDIX B — CCN TABLES cont SERVICE-CONFIGTABLES CONFIG TABLES contAPPENDIX B — CCN TABLES cont APPENDIX B — CCN TABLES cont SERVICE-CONFIGTABLES contAPPENDIX B — CCN TABLES cont SERVICE-CONFIGTABLES contTABLE TABLE SERVICE-CONFIGTABLES contDEFAULT APPENDIX B — CCN TABLES contAPPENDIX B — CCN TABLES cont MAINTENANCE DISPLAY TABLESRANGE MAINTENANCE DISPLAY TABLES contAPPENDIX B — CCN TABLES cont DISPLAY NAMEAPPENDIX B — CCN TABLES cont MAINTENANCE DISPLAY TABLES contTABLE APPENDIX B — CCN TABLES cont MAINTENANCE DISPLAY TABLES contTABLE MAINTENANCE DISPLAY TABLES cont TIME SCHEDULE CONFIG TABLEAPPENDIX B - CCN TABLES cont APPENDIX C - VFD INFORMATION Fig. A — VFD WiringTable A — VFD Terminal Designations APPENDIX C — VFD INFORMATION cont Table B — VFD ConfigurationsFig. B — VFD Keypad APPENDIX C — VFD INFORMATION cont Fig. C — Standard Display ExampleAPPENDIX C — VFD INFORMATION cont To set the clock, perform the following procedurethe status LED on the control panel APPENDIX C — VFD INFORMATION contAPPENDIX C - VFD INFORMATION cont Table C — Fault Codes1.Remove power from drive Table D — Alarm CodesTable E — Maintenance Intervals Check the heat sink as follows when necessaryAPPENDIX C — VFD INFORMATION cont Fig. D - Main Fan Replacement Frame Sizes R1-R4Fig. E — Main Fan Replacement Frame Sizes R5 and R6APPENDIX C — VFD INFORMATION cont Fig. F - Internal Enclosure Fan ReplacementA48-7716 APPENDIX D — MODE SELECTION PROCESS Configuration→SP→SP.CF = 1,2 and the staticAPPENDIX E — UPC OPEN CONTROLLER Fig. A — Address Rotary SwitchesFig. B — UPC Open Controller Fig. D — Network Wiring Configuring the BAS Port for BACnet MSTable A — SW3 Protocol Switch Settings for MS/TP Fig. C — DIP SwitchesTable C — MS/TP Wiring Recommendations Fig. E — BT485 Terminator InstallationAPPENDIX E — UPC OPEN CONTROLLER cont APPENDIX E — UPC OPEN CONTROLLER cont Fig. F — BACview6 Device ConnectionTable E — LED Status Indicators Configuring the UPC Open Controllers PropAPPENDIX E — UPC OPEN CONTROLLER cont APPENDIX E — UPC OPEN CONTROLLER cont NETWORK POINTS LISTAPPENDIX E — UPC OPEN CONTROLLER cont NETWORK POINTS LIST contNETWORK POINTS LIST cont APPENDIX E — UPC OPEN CONTROLLER contReturn Air Relative Humidity NETWORK POINTS LIST cont APPENDIX E — UPC OPEN CONTROLLER contBACNET NETWORK POINTS LIST cont APPENDIX E — UPC OPEN CONTROLLER contBACNET APPENDIX E — UPC OPEN CONTROLLER cont Local Machine DisableNETWORK POINTS LIST cont NETWORK POINTS LIST cont APPENDIX E — UPC OPEN CONTROLLER contBACNET Multi-stageconstant volume units INDEXInternal wiring Multi-stageconstant volume units withForm 48/50A-9T Copyright 2010 Carrier CorporationCatalog No. Printed in U.S.AEXPANSION CONTROLS SET POINT AND CONFIGURATION LOGDEFAULT ITEMCL-2 CL-3 CL-4 EXPANSION DEFAULTCL-5 ITEMSTART-UP UNIT START-UPCHECKLISTPRE-START-UP TEMPERATURES