Carrier 48SX024-060, 48SS018-060 user manual Contents, Safety Considerations

48SS018-060 48SX024-060 Single Package Gas Heating/

Electric Cooling Units

Installation, Start-Up and

Service Instructions

CONTENTS

Page

SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . 1-9

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

RECEIVING AND INSTALLATION . . . . . . . . . . . 10-22 Step 1 Ð Check Equipment . . . . . . . . . . . . . . . . . . 10

·IDENTIFY UNIT

·INSPECT SHIPMENT

Step 2 Ð Provide Unit Support . . . . . . . . . . . . . . 10

·ROOF CURB

·SLAB MOUNT

·FLUSH MOUNT

Step 3 Ð Field Fabricate Ductwork . . . . . . . . . . . 10 Step 4 Ð Provide Clearances . . . . . . . . . . . . . . . . 10 Step 5 Ð Rig and Place Unit . . . . . . . . . . . . . . . . . 10

·UNITS WITHOUT BASE RAIL

·UNITS WITH OPTIONAL BASE RAIL

Step 6 Ð Connect Condensate Drain . . . . . . . . . 13 Step 7 Ð Install Flue Hood . . . . . . . . . . . . . . . . . . 13 Step 8 Ð Install Gas Piping . . . . . . . . . . . . . . . . . . 13 Step 9 Ð Install Duct Connections . . . . . . . . . . . 16

·CONFIGURING UNITS FOR DOWNFLOW (VERTICAL) DISCHARGE

Step 10 Ð Install Electrical Connections . . . . . 18

·HIGH-VOLTAGE CONNECTIONS

·SPECIAL PROCEDURES FOR 208-V OPERATION

·CONTROL VOLTAGE CONNECTIONS; NON-INTEGRATED CONTROL MOTOR (NON-ICM) UNITS

·CONTROL VOLTAGE CONNECTIONS; INTEGRATED CONTROL MOTOR (ICM) UNITS

·HEAT ANTICIPATOR SETTING

·TRANSFORMER PROTECTION

PRE-START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22,23 START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23-44 MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44-47 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . 48-50 START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . CL-1

NOTE TO INSTALLER Ð Before the installation, READ THESE INSTRUCTIONS CAREFULLY AND COM- PLETELY. Also, make sure the User's Manual and Replace- ment Guide are left with the unit after installation. The fur- nace is NOT to be used for temporary heating of buildings or structures under construction.

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 personnel should install, repair, or service air-conditioning equipment.

Fig. 1 Ð Unit 48SX Shown With Optional Base Rail

Untrained personnel can perform basic maintenance func- tions of cleaning coils and ®lters. All other operations should be performed by trained service personnel. When working on air-conditioning equipment, observe 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- tinguisher available for all brazing operations.

Improper installation, adjustment, alteration, service, main- tenance, or use can cause carbon monoxide poisoning, ®re, or an explosion which can result in personal injury or unit damage. Consult a quali®ed installer, service agency, or gas supplier for information or assistance. The quali- ®ed installer or agency must use only factory-authorized kits or accessories when modifying this product.

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

General Ð The 48SS,SX units (see Fig. 1) are fully self- contained, combination Category I gas heating/electric cool- ing units designed for outdoor installation. See Fig. 2-9 (pages 2-9) for unit dimensions. All unit sizes have dis- charge openings for both horizontal and down¯ow con®gu- rations, and are factory shipped with all 4 duct openings covered. Units may be installed either on a rooftop or a ground-level cement slab. See Fig. 10 for roof curb dimensions.

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. 534-721	Printed in U.S.A.	Form 48SS,SX-12SI	Pg 1	9-98	Replaces: 48SS,SX-11SI
Tab	1a	6a