Carrier 50TJ016-028 specifications Contents, Installation, Safety Considerations

50TJ016-028 Single-Package Rooftop Units Electric Cooling with Electric Heat Option

Installation, Start-Up and

Service Instructions

CONTENTS

Page

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

INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18

Step 1 — Provide Unit Support . . . . . . . . . . . . . . . . . . . . . .1

•ROOF CURB

•ALTERNATE UNIT SUPPORT

Step 2 — Rig and Place Unit . . . . . . . . . . . . . . . . . . . . . . . . .1

•POSITIONING

•ROOF MOUNT

Step 3 — Field Fabricate Ductwork . . . . . . . . . . . . . . . . . .7 Step 4 — Make Unit Duct Connections . . . . . . . . . . . . . . .7 Step 5 — Trap Condensate Drain . . . . . . . . . . . . . . . . . . . .7 Step 6 — Make Electrical Connections . . . . . . . . . . . . . .8

•FIELD POWER SUPPLY

•FIELD CONTROL WIRING

•OPTIONAL NON-FUSED DISCONNECT

•OPTIONAL CONVENIENCE OUTLET

Step 7 — Make Outdoor-Air Inlet

Adjustments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

•MANUAL OUTDOOR-AIR DAMPER

•OPTIONAL ECONOMI$ER

Step 8 — Install Outdoor-Air Hood. . . . . . . . . . . . . . . . . .12 Step 9 — Install All Accessories . . . . . . . . . . . . . . . . . . . .15

•MOTORMASTER® I CONTROL INSTALLATION

•MOTORMASTER III CONTROL INSTALLATION

Step 10 — Install Humidistat for Optional

MoistureMiser Dehumidification Package . . . . . . . . .16

START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18-24 SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24-31

IMPORTANT: Units have high ambient operating lim- its. If limits are exceeded, the unit will automatically lock the compressor out of operation. Manual reset will be required to restart the compressor.

INSTALLATION

Step 1 — Provide Unit Support

ROOF CURB — Assemble and install accessory roof curb or horizontal adapter roof curb in accordance with instructions shipped with the curb or horizontal adapter. Accessory roof curb and horizontal adapter roof curb and information required to field fabricate a roof curb or horizontal adapter roof curb are shown in Fig. 1 and 2. Install insulation, cant strips, roofing, and counter flashing 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 or adapter roof curb is critical for a leak-proof seal. Install gasket supplied with the roof curb or adapter roof curb as shown in Fig. 1. Improperly applied gasket can result in air leaks and poor unit performance.

Curb or adapter roof curb should be level. This is necessary to permit unit drain to function properly. Unit leveling toler- ance is ± 1/16 in. per linear ft in any direction. Refer to Accesso- ry Roof Curb or Horizontal Adapter Roof Curb Installation In- structions for additional information as required.

TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32,33 START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . . . . . . CL-1

SAFETY CONSIDERATIONS

Installation and servicing air-conditioning equipment can be hazardous due to system pressure and electrical components. Only trained and qualified service personnel should install, re- pair, or service air-conditioning equipment.

Untrained personnel can perform basic maintenance func- tions of cleaning coils and filters and replacing filters. All other operations should be performed by trained service personnel. When working on air-conditioning equipment, observe precau- tions 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 fire extinguishers 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.

ALTERNATE UNIT SUPPORT — 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 with a minimum of 3 equally spaced 4-in. x 4-in. pads on each side.

Step 2 — Rig and Place Unit — Inspect unit for transportation damage. File any claim with transportation agency. Keep unit upright, and do not drop. Use spreader bars over unit to prevent sling or cable damage. Rollers may be used to move unit across a roof. Level by using unit frame as a refer- ence; leveling tolerance is ± 1/16 in. per linear ft in any direc- tion. See Fig. 3 for additional information. Unit weight is shown in Table 1.

Four lifting holes are provided in ends of unit base rails as shown in Fig. 3. Refer to rigging instructions on unit.

POSITIONING — Provide clearance around and above unit for airflow, safety, and service access (Fig. 4 and 5).

Do not install unit in an indoor location. Do not locate air in- lets near exhaust vents or other sources of contaminated air.

Although unit is weatherproof, guard against water from higher level runoff and overhangs.

ROOF MOUNT — Check building codes for weight distribu- tion requirements.

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. 535-034	Printed in U.S.A.	Form 50TJ-17SI	Pg 1	2-01	Replaces: 50TJ-14SI
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