Carrier 50SS018-060, 50SX024-060 owner manual Contents, Safety Considerations

50SS018-060 50SX024-060 Single-Package Cooling Units

Installation, Start-Up and

Service Instructions

CONTENTS

Page

SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . 1-12

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

RECEIVING AND INSTALLATION . . . . . . . . . . . 13-26 Step 1 Ð Check Equipment . . . . . . . . . . . . . . . . . . 13

·IDENTIFY UNIT

·INSPECT SHIPMENT

Step 2 Ð Provide Unit Support . . . . . . . . . . . . . . 13

·ROOF CURB

·SLAB MOUNT

Step 3 Ð Provide Clearances . . . . . . . . . . . . . . . . 13 Step 4 Ð Rig and Place Unit . . . . . . . . . . . . . . . . . 13

·UNITS WITHOUT BASE RAILS

·UNITS WITH OPTIONAL BASE RAILS

Step 5 Ð Select and Install Ductwork . . . . . . . . 16

·CONVERTING HORIZONTAL DISCHARGE

UNITS TO DOWNFLOW (VERTICAL) DISCHARGE

ÐSTD (NON-ICM) UNITS

·CONVERTING HORIZONTAL DISCHARGE UNITS TO DOWNFLOW (VERTICAL) DISCHARGE

ÐICM UNITS

·ACCESSORY DUCT FLANGE KIT INSTALLATION

Step 6 Ð Provide for Condensate Disposal . . . 20 Step 7 Ð Install Electrical Connections . . . . . . 21

·HIGH-VOLTAGE CONNECTIONS

·ROUTING POWER LEADS INTO UNIT

·CONNECTING GROUND LEAD TO WIRE-BINDING SCREW

·ROUTING CONTROL POWER WIRES Ð STD NON-ICM UNITS (24 V)

·ROUTING CONTROL POWER WIRES Ð ICM UNITS (24 V)

·SPECIAL PROCEDURES FOR 208-V OPERATION

PRE-START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26,27

START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27-39 Check for Refrigerant Leaks . . . . . . . . . . . . . . . . . 27

Start-Up Cooling Section and

Make Adjustments . . . . . . . . . . . . . . . . . . . . . . . . 27

MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40,41

Air Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Unit Top Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Evaporator Blower and Motor . . . . . . . . . . . . . . . . 40

Condenser Coil, Evaporator Coil,

and Condensate Drain Pan . . . . . . . . . . . . . . . . 41

Condenser Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Electrical Controls and Wiring . . . . . . . . . . . . . . . 41

Refrigerant Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Evaporator Air¯ow . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Metering Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Liquid Line Strainer . . . . . . . . . . . . . . . . . . . . . . . . . 41

TROUBLESHOOTING COOLING CHART . . . . . 42,43

START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . CL-1

Fig. 1 Ð Unit 50SX With Optional Base Rail Shown

NOTE TO INSTALLER Ð Before the installation, READ THESE INSTRUCTIONS CAREFULLY AND COM- PLETELY. Also, make sure the Owner's Manual and Serv- ice Instructions are left with the unit after installation.

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.

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.

Before performing service or maintenance operations on system, turn off main power to unit. Turn off accessory heater power switch if applicable. Electrical shock can cause personal injury.

General Ð 50SS,SX cooling units are fully self-contained and designed for outdoor installation. See Fig. 1. As shown in Fig. 2-9, both small- and large-cabinet units are shipped in a horizontal-discharge con®guration for installation on a ground-level slab. All units can be converted to down- ¯ow discharge con®gurations for rooftop applications. See Fig. 10 for roof curb dimensions.

Instructions continued on page 13.

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. 535-022	Printed in U.S.A.	Form 50SS,SX-4SI	Pg 1	5-95	Replaces: 50SS,SX-3SI
Tab	1b	6b