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Carrier 48EK, 48EW, 48EY024-068, 48AW, 48AY020-060, 48AK, 48AJ Service Training, Call For Free Catalog

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

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SERVICE TRAINING

SERVICE TRAINING

Packaged Service Training programs are an excellent way to increase your knowledge of the equipment discussed in this manual, including:

•	Unit Familiarization	•	Maintenance
•	Installation Overview	•	Operating Sequence

A large selection of product, theory, and skills programs are available, using popular video-based formats and materials. All include video and/or slides, plus companion book.

Classroom Service Training which includes “hands-on” experience with the products in our labs can mean increased confidence that really pays dividends in faster troubleshooting and fewer callbacks. Course descriptions and schedules are in our catalog.

CALL FOR FREE CATALOG 1-800-962-9212

[ ] Packaged Service Training

[ ] Classroom Service Training

Copyright 2001 Carrier Corporation

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Book	1	PC 111	Catalog No. 534-739	Printed in U.S.A.	Form 48A,E-1SI	Pg 116	107 11-01	Replaces: 48E-6SI
Tab	1a

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Carrier 48EK, 48EW, 48EY024-068, 48AW, 48AY020-060, 48AK, 48AJ, 48EJ specifications Service Training, Call For Free Catalog

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 48EJ,EK,EW,EY Units Table 2 — Operating Weights48AJ,AK,AW,AY Units Fig. 19 — Air Distribution — Thru-the-Side Table 3 — Evaporator Fan Motor DataFig. 18 — Air Distribution — Thru-the-Bottom 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. 35 — Field HIR Heat Interlock Relay Wiring Step 10 — Make Outdoor-AirInlet AdjustmentsFig. 34 - Space Temperature Averaging Wiring Right Side/Center Economizer Hood Shown Fig. 37 - Economizer Hood AssemblyFig. 36 — Adding Seal Strip to Top of Hood Sides 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 toSave screws Fig. 47 - Wiring Connections for Solid-StateEnthalpy Control HH57AC077 Fig. 49 - Economizer Details CONTROLCONTROL POINT CURVEFig. 51 - Pressure Transducer Locations 48AJ,AK,AW,AY060 and 48EJ,EK,EW,EY054-06848AJ,AK,AW,AY020-030and 48EJ,EK,EW,EY024-034 Fig. 52 - Motormaster III Control Baffle DetailsFig. 53A — Motormaster III Sensor Location 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 ConversionSTART-UP Fig. 56 — Wiring Field-SuppliedUnloaders forConstant Volume Units 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 StructureOperation and Controlling Factors Fig. 61 — Space Temperature Reset WiringTable 40 — Occupied Heat and Morning Warm-Up Fig. 62 - Field-SuppliedSmoke Detector Wiring Units with 2 Compressors Table 41 — Smoke Control ModesTable 42 — Cooling Capacity Staging Table, CV Fig. 63 — Door Latch SERVICEFig. 64 — Spark Gap Adjustment Fig. 65 — Typical Gas Heating Section Fig. 66 — Gas Heat Section DetailsFig. 68 — Evaporator Fan Coupling Fig. 67 — Evaporator-FanAlignment and AdjustmentLubrication 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 LPS — Low-PressureSwitch LEGEND FPS — Freeze Protection SwitchHPS — High-PressureSwitch 8-Pass LPS — Low-PressureSwitch LEGEND FPS — Freeze Protection SwitchHPS — High-PressureSwitch TXV — Thermostatic Expansion Valve LEGEND HPS — High-PressureSwitchLPS — Low-PressureSwitch HPS - High-PressureSwitch LPS — Low-PressureSwitchLEGEND TXV — Thermostatic Expansion ValveTXV — Thermostatic Expansion Valve LEGEND HPS — High-PressureSwitchLPS — Low-PressureSwitch TXV — Thermostatic Expansion Valve LEGEND HPS — High-PressureSwitchLPS — Low-PressureSwitch IGC — Integrated Gas Unit Controller Fig. 94 — IGC Control Heating and CoolingLEGEND IDM — Induced-DraftMotor Table 44 - IGC Control Board LED Alarms Table 45 — Control Board LED AlarmsPage SERVICE TRAINING CALL FOR FREE CATALOGSTART-UPCHECKLIST TEMPERATURESPRE-START-UP ELECTRICALGENERAL