Carrier 48TJD008-014 installation instructions Installation, Start-Upand Service Instructions

48TJD008-014 48TJE008-014 48TJF008-012

Single-Package Rooftop Heating/Cooling Units

Installation, Start-Up and

Service Instructions

CONTENTS

Page

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

INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22

Step 1 Ð Provide Unit Support . . . . . . . . . . . . . . . 1

·ROOF CURB

·SLAB MOUNT

Step 2 Ð Field Fabricate Ductwork . . . . . . . . . . . . 2

Step 3 Ð Install External Trap for Condensate Drain . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Step 4 Ð Rig and Place Unit . . . . . . . . . . . . . . . . . . 2

· POSITIONING

Step 5 Ð Install Flue Hood . . . . . . . . . . . . . . . . . . . 8 Step 6 Ð Install Gas Piping . . . . . . . . . . . . . . . . . . . 8 Step 7 Ð Make Electrical Connections . . . . . . . . 8

·FIELD POWER SUPPLY

·FIELD CONTROL WIRING

·HEAT ANTICIPATOR SETTINGS

Step 8 Ð Adjust Factory-Installed Options . . . 11

·APOLLO CONTROL

·MANUAL OUTDOOR-AIR DAMPER

·OPTIONAL DURABLADE ECONOMIZER

·OPTIONAL PARABLADE ECONOMIZER

Step 9 Ð Adjust Evaporator-Fan Speed . . . . . . 16

START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23,24 SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25-30 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . 31-36 START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . CL-1

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.

Disconnect gas piping from unit when leak testing at pressure greater than 1¤2 psig. Pres- sures greater than 1¤2 psig will cause gas valve damage resulting in hazardous con- dition. If gas valve is subjected to pres- sure greater than 1¤2 psig, it must be replaced before use. When pressure testing ®eld- supplied gas piping at pressures of 1¤2 psig or less, a unit connected to such piping must be isolated by manually closing the gas valve(s).

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

INSTALLATION

Unit is shipped in the vertical discharge con®guration. To convert to horizontal con®guration, remove screws from side duct opening covers and remove covers. Using the same screws, install covers on vertical duct openings with the insulation- side down. Seals around duct openings must be tight. See Fig. 1.

Step 1 Ð Provide Unit Support

ROOF CURB Ð Assemble and install accessory roof curb in accordance with instructions shipped with curb. See Fig. 2. Install insulation, cant strips, roo®ng felt, and counter ¯ashing as shown. Ductwork must be attached to curb. If gas is to be routed through the curb, attach the accessory thru-the-curb service connection plate to the roof curb in ac- cordance with the accessory installation instructions. Con- nection plate must be installed before unit is set in roof curb.

IMPORTANT: The gasketing of the unit to the roof curb is critical for a watertight seal. Install gasket sup- plied with the roof curb as shown in Fig. 2. Improp- erly applied gasket can also result in air leaks and poor unit performance.

Curb should be level. Unit leveling tolerances are shown in Fig. 3. This is necessary for unit drain to function prop- erly. Refer to Accessory Roof Curb Installation Instructions for additional information as required.

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

Book	1	4	PC 111	Catalog No. 564-934	Printed in U.S.A.	Form 48TJ-13SI	Pg 1	9-96	Replaces: 48TJ-10SI
Tab	1a	6a