Manuals / Carrier / Household Appliance / Air Conditioner

Carrier 48EW, 48EY024-068, 48AW, 48EK LEGEND HPS — High-PressureSwitch, LPS — Low-PressureSwitch

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

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LEGEND

HPS — High-Pressure Switch

LPS — Low-Pressure Switch

TXV — Thermostatic Expansion Valve

Fig. 93 — Typical Refrigerant Circuiting (48EJ,EK,EW,EY068)

Image 112

Carrier 48EW, 48EY024-068 LEGEND HPS — High-PressureSwitch, LPS — Low-PressureSwitch, TXV — Thermostatic Expansion Valve

Contents

CONTENTS SAFETY CONSIDERATIONSINSTALLATION 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 Fig. 23 — Field Gas Piping Table 4 — 48A,E Series Staged Gas ImplementationTable 6 - Thermistor Designations Fig. 24 — Supply-AirThermistor Connections Fig. 25 — Indoor Air Quality Sensor Configuration Fig. 26 — Field Control Remote Start/StopStep 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. 32 — Field Control Thermostat Wiring Fig. 33 — Field Control Temperature SensorWiring 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 Fig. 38 — Adding Seal Strip to Sides of Hood Top Mounting FlangeFig. 39 — Adding Seal Strip to Back of Hood Top Fig. 40 — Adding Foam Strip to Cross MemberAttached to Filter Track Assembly 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 Fig. 49 - Economizer Details CONTROLCONTROL POINT CURVEFig. 51 - Pressure Transducer Locations 48AJ,AK,AW,AY060 and 48EJ,EK,EW,EY054-068Fig. 53A — Motormaster III Sensor Location Fig. 52 - Motormaster III Control Baffle Details48AJ,AK,AW,AY020-030and 48EJ,EK,EW,EY024-034 Fig. 53B — Motormaster III Sensor Location 48AJ,AK,AW,AY035 and 48EJ,EK,EW,EY038Fig. 53C — Motormaster III Sensor Location 48AJ,AK,AW,AY040, 050 and 48EJ,EK,EW,EY048Step 13 — Field Modifications Fig. 54 — Side Return Air ConversionConstant Volume Units Fig. 56 — Wiring Field-SuppliedUnloaders forSTART-UP Factory-InstalledJumpers Fig. 57 — Toshiba TOSVERT130-E3VFD13.Replace jumper across terminals ST and CC 13.Replace jumper across terminals R and CC LEGEND Typical Factory Wiring Optional Field 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 33 — Motor Limitations Table 34 — Air Quality LimitsSequence of Operation Table 35 — User Defined Set Points Table 36 - Software Control Link 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 37 — Staged Gas System Components Table 38 — Stage Gas System Inputs/OutputsFig. 60 — Navigator Display Table 39 — Navigator Display Menu StructureTable 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. 65 — Typical Gas Heating Section Fig. 66 — Gas Heat Section DetailsLubrication Fig. 67 — Evaporator-FanAlignment and AdjustmentFig. 68 — Evaporator Fan Coupling Evaporator Fan Service and Replacement Belt Tension Adjustment — To adjust belt tensionEvaporator-FanMotor Replacement Condenser-FanAdjustmentGas Valve Adjustment Fig. 71 — Cooling Charging ChartFig. 72 — Cooling Charging Chart 48EJ,EK,EW,EY024-034Fig. 73 — Cooling Charging Chart Fig. 74 — Cooling Charging Chart48EJ,EK,EW,EY054-068 48AJ,AK,AW,AY020-060LEGEND for Fig. 77-83— Typical Wiring Schematics Protective DevicesTABLE 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 FPS — Freeze Protection Switch HPS - High-PressureSwitchLPS - 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 HPS - High-PressureSwitch LPS — Low-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 44 - IGC Control Board LED Alarms Table 45 — Control Board LED AlarmsPage SERVICE TRAINING CALL FOR FREE CATALOGSTART-UPCHECKLIST TEMPERATURESPRE-START-UP ELECTRICALGENERAL