Installation, Start-Up and
Service Instructions
CONTENTS
Page
SAFETY CONSIDERATIONS
. . . . . . . . . . . . . . . . . 1-12
General
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
RECEIVING AND INSTALLATION
. . . . . . . . . . . 13-26
Step 1 — Check Equipment
. . . . . . . . . . . . . . . . . . 13
• IDENTIFY UNIT
• INSPECT SHIPMENT
Step 2 — Provide Unit Support
. . . . . . . . . . . . . . 13
• ROOF CURB
• SLAB MOUNT
Step 3 — Provide Clearances
. . . . . . . . . . . . . . . . 13
Step 4 — Rig and Place Unit
. . . . . . . . . . . . . . . . . 13
• UNITS WITHOUT BASE RAILS
• UNITS WITH OPTIONAL BASE RAILS
Step 5 — Select and Install Ductwork
. . . . . . . . 16
• CONVERTING HORIZONTAL DISCHARGE
UNITS TO DOWNFLOW (VERTICAL) DISCHARGE
— STD (NON-ICM) UNITS
• CONVERTING HORIZONTAL DISCHARGE UNITS
TO DOWNFLOW (VERTICAL) DISCHARGE
— ICM UNITS
• ACCESSORY DUCT FLANGE KIT INSTALLATION
Step 6 — Provide for Condensate Disposal
. . . 20
Step 7 — Install Electrical Connections
. . . . . . 21
• HIGH-VOLTAGE CONNECTIONS
• ROUTING POWER LEADS INTO UNIT
• CONNECTING GROUND LEAD TO
WIRE-BINDING SCREW
• ROUTING CONTROL POWER WIRES — STD
NON-ICM UNITS (24 V)
• ROUTING CONTROL POWER WIRES — 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 Airflow
. . . . . . . . . . . . . . . . . . . . . . . . . . 41
Metering Devices
. . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Liquid Line Strainer
. . . . . . . . . . . . . . . . . . . . . . . . . 41
TROUBLESHOOTING COOLING CHART
. . . . . 42,43
START-UP CHECKLIST
. . . . . . . . . . . . . . . . . . . . . CL-1
NOTE TO INSTALLER — 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 qualified personnel should install,
repair, or service air-conditioning equipment.
Untrained personnel can perform basic maintenance func-
tions of cleaning coils and filters. 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 fire 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 —
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 configuration for installation on
a ground-level slab. All units can be converted to down-
flow discharge configurations for rooftop applications. See
Fig. 10 for roof curb dimensions.
Instructions continued on page 13.
Fig. 1 — Unit 50SX With Optional Base Rail Shown
50SS018-060
50SX024-060
Single-Package Cooling Units
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1
4
Tab
1b 6b
PC 111
Catalog No. 535-022
Printed in U.S.A.
Form 50SS,SX-4SI
Pg 1
5-95
Replaces: 50SS,SX-3SI
Summary of Contents for 50SS018
Page 8: ...Fig 8 Dimensions Units 50SX042 060 Without Base Rail 8...
Page 10: ...Fig 9 Dimensions Units 50SX042 060 With Optional Base Rail 10...
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