Carrier 50EW, 50EJ, 50EY installation instructions Contents, Important Ð Read Before Installing

50EJ,EK,EW,EY024-048 Single-Package Rooftop Units Electric Cooling with Electric Heat Option

Installation, Start-Up and

Service Instructions

CONTENTS

Page

SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . 1

INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-31 Step 1 Ð Provide Unit Support . . . . . . . . . . . . . . 1

·ROOF CURB

·ALTERNATE UNIT SUPPORT

Step 2 Ð Rig and Place Unit . . . . . . . . . . . . . . . . . 8

·POSITIONING

·ROOF MOUNT

Step 3 Ð Field Fabricate Ductwork . . . . . . . . . . . 11 Step 4 Ð Make Unit Duct Connections . . . . . . . 11 Step 5 Ð Trap Condensate Drain . . . . . . . . . . . . . 11 Step 6 Ð Controls Options . . . . . . . . . . . . . . . . . . 12

·CONSTANT VOLUME APPLICATIONS

·VARIABLE AIR VOLUME (VAV)

APPLICATIONS

Step 7 Ð Make Electrical Connections . . . . . . . 15

·POWER WIRING

·FIELD POWER SUPPLY

·FIELD CONTROL WIRING

Step 8 Ð Make Outdoor-Air Inlet

Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

·ECONOMIZER

·ECONOMIZER SETTINGS

Step 9 Ð Position Power Exhaust/

Barometric Relief Damper Hood . . . . . . . . . . . . . 29 Step 10 Ð Install Accessories . . . . . . . . . . . . . . . 30

START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32-42 SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42-45 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . 46-51 START-UP CHECKLIST . . . . . . . . . . . . . . . CL-1, CL-2

IMPORTANT Ð READ BEFORE INSTALLING

IMPORTANT: Due to upgrades in unit control soft- ware and hardware, units produced currently are slightly different than original design units. The unit control software (which has changed) is designated with a sticker on the unit control board, chip U8 (the large chip in the center of the board), which states the software Ver- sion number. Version 1.0 is the original version. Ver- sion 2.0 is the current version. Differences in instal- lation, con®guration, and start-up procedures in this manual will be identi®ed by Version number.

INSTALLATION

Step 1 Ð Provide Unit Support

All panels must be in place when rigging. Unit is not designed for handling by fork truck.

ROOF CURB Ð Assemble and install accessory roof curb in accordance with instructions shipped with the curb. Ac- cessory roof curb and information required to ®eld fabricate a roof curb or horizontal adapter are shown in Fig. 1 and 2. Install insulation, cant strips, roo®ng, and counter ¯ashing as shown. Ductwork can be secured to roof curb before unit is set in place.

IMPORTANT: The gasketing of the unit to the roof curb is critical for a leak-proof seal. Install gasket sup- plied with the roof curb as shown in Fig. 1. Improp- erly applied gasket can result in air leaks and poor unit performance.

SAFETY CONSIDERATIONS

Installation and servicing of air-conditioning equipment can be hazardous due to system pressure and electrical com- ponents. Only trained and quali®ed service personnel should install, repair, or service air-conditioning equipment.

Untrained personnel can perform basic maintenance func- tions of cleaning coils and ®lters and replacing ®lters. All other operations should be performed by trained service per- sonnel. When working on air-conditioning equipment, ob- serve precautions in the literature, tags and labels attached to the unit, and other safety precautions that may apply.

Follow all safety codes. Wear safety glasses and work gloves. Use quenching cloth for unbrazing operations. Have ®re ex- tinguishers available for all brazing operations.

Before performing service or maintenance operations on unit, turn off main power switch to unit. Electrical shock could cause personal injury.

Curb should be level. This is necessary to permit unit drain to function properly. Unit leveling tolerance is shown in Fig 1 and 2. Refer to Accessory Roof Curb Installation In- structions for additional information as required. When ac- cessory roof curb is used, unit may be installed on class A, B, or C roof covering material.

ALTERNATE UNIT SUPPORT Ð When the curb or adapter cannot be used, support unit with sleepers using unit curb or adapter support area. If sleepers cannot be used, support long sides of unit (refer to Fig. 3-6) with a minimum number of equally spaced 4-in. x 4-in. pads as follows: 50EJ,EK,EW,EY024-034 units require 3 pads on each side; 50EJ,EK,EW,EY038-048 require 4 pads on each side. Unit may sag if supported by corners only.

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

Book	1	PC 111	Catalog No. 535-006	Printed in U.S.A.	Form 50E-3SI	Pg 1	8-96	Replaces: 50E-1SI
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