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Carrier 48EY024-068, 48EW, 48AW, 48AY020-060, 48AK, 48AJ, 48EJ Typical 48EK VAV 24-VControl Circuit

Models: 48EJ 48AJ 48AK 48EK 48AY020-060 48AW 48EY024-068 48EW

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Fig. 78 — Typical 48EK VAV 24-V Control Circuit

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Fig. 78 — Typical 48EK VAV 24-V Control Circuit

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Carrier 48EY024-068, 48EW, 48AW, 48AY020-060, 48AK, 48AJ, 48EJ specifications Typical 48EK VAV 24-VControl Circuit

Contents

SAFETY CONSIDERATIONS CONTENTSINSTALLATION Step 1 — Provide Unit Support Step 11 — Position Power Exhaust/BarometricStep 4 — Make Unit Duct Connections Page Page Page NOTES Fig. 5 - Base Unit Dimensions - 48AJ,AK020-030 Fig. 6 — Base Unit Dimensions — 48AJ,AK035-050 Fig. 7 — Base Unit Dimensions — 48AJ,AK060 Fig. 8 — Base Unit Dimensions — 48AW,AY020-030 Fig. 9 — Base Unit Dimensions — 48AW,AY035-050 Fig. 10 — Base Unit Dimensions — 48W,AY060 Fig. 11 — Base Unit Dimensions — 48EJ,EK024-034 Fig. 12 — Base Unit Dimensions — 48EJ,EK038-048 Fig. 13 — Base Unit Dimensions — 48EJ,EK054-068 Fig. 14 — Base Unit Dimensions — 48EW,EY024-034 Fig. 15 — Base Unit Dimensions — 48EW,EY038-048 Fig. 16 — Base Unit Dimensions — 48EW,EY054-068 Fig. 17 — Rigging Information Fig. 17 — Rigging Information cont Table 1A — Physical Data — 48AJ,AK,AW,AY Units UNIT 48AJ,AK,AW,AY Table 1B — Physical Data — 48EJ,EK,EW,EY Units UNIT 48EJ,EK,EW,EY UNIT 48EJ,EK,EW,EY 48AJ,AK,AW,AY Units Table 2 — Operating Weights48EJ,EK,EW,EY Units Fig. 18 — Air Distribution — Thru-the-Bottom Table 3 — Evaporator Fan Motor DataFig. 19 — Air Distribution — Thru-the-Side Step 5 — Install Flue Hood Table 4 — 48A,E Series Staged Gas Implementation Fig. 23 — Field Gas PipingTable 6 - Thermistor Designations Fig. 24 — Supply-AirThermistor Connections Fig. 26 — Field Control Remote Start/Stop Fig. 25 — Indoor Air Quality Sensor ConfigurationStep 9 - Make Electrical Connections Fig. 27 — Control Board Diagram Table 7 — Electrical Data — 48AJ,AK,AW,AY Units UNIT SIZE 30.8/28.0 236.3/230.9 Table 8 — Electrical Data — 48EJ,EK,EW,EY Units 30.8 0.96 UNIT Fig. 28 - Field Power Wiring Connections LEGEND Thermostat Wiring CV Only- Install a Carrier-approvedaccessory thermostat assembly per current price pages according to the installation instructions included with the ac- cessory or these instructions. Locate the thermostat on a solid interior wall in the conditioned space to sense the average temperature LEGEND Fig. 33 — Field Control Temperature Sensor Fig. 32 — Field Control Thermostat WiringWiring CV or VAV Units Table 9 — CCN Connection Approved Shielded CablesFig. 34 - Space Temperature Averaging Wiring Step 10 — Make Outdoor-AirInlet AdjustmentsFig. 35 — Field HIR Heat Interlock Relay Wiring Fig. 36 — Adding Seal Strip to Top of Hood Sides Fig. 37 - Economizer Hood AssemblyRight Side/Center Economizer Hood Shown Mounting Flange Fig. 38 — Adding Seal Strip to Sides of Hood TopFig. 39 — Adding Seal Strip to Back of Hood Top Fig. 40 — Adding Foam Strip to Cross MemberFilter Track Assembly Attached to Filter Track AssemblyFig. 43 - Mounting Angle Without Tabs Fig. 44 — Mounting Angle With Tabs Attached toEnthalpy Control HH57AC077 Fig. 47 - Wiring Connections for Solid-StateSave screws CONTROL Fig. 49 - Economizer DetailsCONTROL POINT CURVE48AJ,AK,AW,AY060 and 48EJ,EK,EW,EY054-068 Fig. 51 - Pressure Transducer LocationsFig. 53A — Motormaster III Sensor Location Fig. 52 - Motormaster III Control Baffle Details48AJ,AK,AW,AY020-030and 48EJ,EK,EW,EY024-034 48AJ,AK,AW,AY035 and 48EJ,EK,EW,EY038 Fig. 53B — Motormaster III Sensor LocationFig. 53C — Motormaster III Sensor Location 48AJ,AK,AW,AY040, 050 and 48EJ,EK,EW,EY048Fig. 54 — Side Return Air Conversion Step 13 — Field ModificationsConstant Volume Units Fig. 56 — Wiring Field-SuppliedUnloaders forSTART-UP Fig. 57 — Toshiba TOSVERT130-E3VFD Factory-InstalledJumpers13.Replace jumper across terminals ST and CC 13.Replace jumper across terminals R and CC Optional Field Wiring LEGEND Typical Factory WiringSee below for building pressure to signal level Table 17 — DIP Switch Configuration Table 18 — DIP Switch Factory Settings AIRFLOW AIRFLOW AIRFLOW 1.06 2.15 3.18 4.81 AIRFLOW AIRFLOW AIRFLOW AIRFLOW AIRFLOW AIRFLOW Table 34 — Air Quality Limits Table 33 — Motor LimitationsSequence of Operation Table 36 - Software Control Link Points Table 35 — User Defined Set PointsThe Time Guard function maintains a minimum off time of 5 minutes, a minimum ON time of 10 seconds, and a minimum delay before starting the second compressor of 10 seconds Fig. 59 — Heat Interlock Relay Wiring Table 38 — Stage Gas System Inputs/Outputs Table 37 — Staged Gas System ComponentsTable 39 — Navigator Display Menu Structure Fig. 60 — Navigator DisplayTable 40 — Occupied Heat and Morning Warm-Up Fig. 61 — Space Temperature Reset WiringOperation and Controlling Factors Fig. 62 - Field-SuppliedSmoke Detector Wiring Table 42 — Cooling Capacity Staging Table, CV Table 41 — Smoke Control ModesUnits with 2 Compressors Fig. 64 — Spark Gap Adjustment SERVICEFig. 63 — Door Latch Fig. 66 — Gas Heat Section Details Fig. 65 — Typical Gas Heating SectionLubrication Fig. 67 — Evaporator-FanAlignment and AdjustmentFig. 68 — Evaporator Fan Coupling Belt Tension Adjustment — To adjust belt tension Evaporator Fan Service and ReplacementEvaporator-FanMotor Replacement Condenser-FanAdjustmentFig. 71 — Cooling Charging Chart Gas Valve AdjustmentFig. 72 — Cooling Charging Chart 48EJ,EK,EW,EY024-034Fig. 74 — Cooling Charging Chart Fig. 73 — Cooling Charging Chart48EJ,EK,EW,EY054-068 48AJ,AK,AW,AY020-060Protective Devices LEGEND for Fig. 77-83— Typical Wiring SchematicsTABLE 1A Fig. 78 — Typical 48EK VAV 24-VControl Circuit Fig. 79 — Typical CV 24-VControl Circuit Fig. 80 — Typical 48EK VAV 115-VControl Circuit Fig. 81 — Typical 48EJ CV 115-VControl Circuit Page Page TROUBLESHOOTING HPS - High-PressureSwitch FPS — Freeze Protection SwitchLPS - Low-PressureSwitch LEGENDcompressor HPS — High-PressureSwitch LEGEND FPS — Freeze Protection SwitchLPS — Low-PressureSwitch 8-Pass HPS — High-PressureSwitch LEGEND FPS — Freeze Protection SwitchLPS — Low-PressureSwitch LPS — Low-PressureSwitch LEGEND HPS — High-PressureSwitchTXV — Thermostatic Expansion Valve LPS — Low-PressureSwitch HPS - High-PressureSwitchLEGEND TXV — Thermostatic Expansion ValveLPS — Low-PressureSwitch LEGEND HPS — High-PressureSwitchTXV — Thermostatic Expansion Valve LPS — Low-PressureSwitch LEGEND HPS — High-PressureSwitchTXV — Thermostatic Expansion Valve LEGEND IDM — Induced-DraftMotor Fig. 94 — IGC Control Heating and CoolingIGC — Integrated Gas Unit Controller Table 45 — Control Board LED Alarms Table 44 - IGC Control Board LED AlarmsPage CALL FOR FREE CATALOG SERVICE TRAININGTEMPERATURES START-UPCHECKLISTPRE-START-UP ELECTRICALGENERAL