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HEATING & COOLING 48LJE/LJF004 48LJ D/L J E/L J F005-007 Single-Package Rooftop Heating/Cooling Units Installation, Start-Up, and Service Instructions CONTENTS Page SAFETY CONSIDERATIONS ...................1 INSTALLATION ............................1-19 Step 1 — Provide Unit Support................1 • ROOF CURB • SLAB MOUNT Step 2 — Field Fabricate Ductwork ............1 Step 3 — Install External Trap for Condensate Drain ..........................2 Step 4 — Rig and Place Unit ..................2 • POSITIONING Step 5 — Install Flue Hood....................7 Step 6 — Install Gas Piping ...................7 Step 7 — Make Electrical Connections.........7 • FIELD POWER SUPPLY • FIELD CONTROL WIRING • HEAT ANTICIPATOR SETTINGS Step 8 - Make Outdoor-Air Adjustments and Install Outdoor-Air Hood...................10 • MANUAL OUTDOOR-AIR DAMPER • TWO-POSITION DAMPER • OPTIONAL ECONOMIZER Step 9 — Adjust Evaporator-Fan Speed.......13 • DIRECT DRIVE MOTORS • BELT DRIVE MOTORS START-UP ................................20,21 SERVICE .................................21-25 TROUBLESHOOTING......................26-31 SAFETY CONSIDERATIONS Installation and servicing of air-conditioning equipment can be hazardous due to sys...

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