50SD
Single Packaged Electric Cooling Units
Installation, Start-Up, and Operating Instructions
Sizes 024-060
NOTE:
Read the entire instruction manual before starting the
installation.
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TABLE OF CONTENTS
SAFETY CONSIDERATIONS .....................................................1
RULES FOR SAFE INSTALLATION AND OPERATION .......2
INTRODUCTION ..........................................................................2
RECEIVING AND INSTALLATION ..........................................2
Check Equipment......................................................................2
IDENTIFY UNIT ................................................................2
INSPECT SHIPMENT ........................................................2
Provide Unit Support ................................................................2
ROOF CURB.......................................................................2
SLAB MOUNT ...................................................................2
GROUND MOUNT ............................................................2
Provide Clearances....................................................................2
Field Fabricate Ductwork .........................................................2
Rig and Place Unit....................................................................2
INSPECTION ......................................................................4
INSTALLATION ................................................................4
Connect Condensate Drain .......................................................7
Install Duct Connections ..........................................................7
CONFIGURING UNITS FOR DOWNFLOW (VERTI-
CAL) DISCHARGE ............................................................7
Install Electrical Connection ....................................................9
HIGH-VOLTAGE CONNECTIONS..................................9
SPECIAL PROCEDURES FOR 208-V OPERATION .....9
CONTROL VOLTAGE CONNECTIONS.........................9
STANDARD CONNECTION ..........................................10
TRANSFORMER PROTECTION....................................12
PRE-START-UP ..........................................................................12
START-UP ...................................................................................12
CHECK FOR REFRIGERANT LEAKS..........................12
START UP COOLING SECTION AND MAKE ADJUST-
MENTS ..............................................................................12
CHECKING COOLING CONTROL OPERATION .......12
CHECKING
AND
ADJUSTING
REFRIGERANT
CHARGE ...........................................................................12
INDOOR
AIRFLOW
AND
AIRFLOW
ADJUST-
MENTS ..............................................................................14
For 208/230V.....................................................................14
COOLING SEQUENCE OF OPERATION.....................14
MAINTENANCE.........................................................................14
AIR FILTER......................................................................15
EVAPORATOR BLOWER AND MOTOR.....................15
CONDENSER COIL, EVAPORATOR COIL, AND CON-
DENSATE DRAIN PAN ..................................................16
CONDENSER FAN ..........................................................16
ELECTRICAL CONTROLS AND WIRING ..................16
REFRIGERANT CIRCUIT...............................................16
EVAPORATOR AIRFLOW .............................................17
METERING DEVICE — ACCURATER ........................17
TROUBLESHOOTING ...............................................................17
START-UP CHECKLIST............................................................17
NOTE TO INSTALLER — Before the installation, READ THESE
INSTRUCTIONS CAREFULLY AND COMPLETELY. Also,
make sure the User’s Manual and Replacement Guide 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 components. Only
trained and qualified personnel should install, repair, or service
air-conditioning equipment.
Untrained personnel can perform basic maintenance functions 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 extinguisher
available for all brazing operations. Consult a qualified installer or
service agency for information or assistance. The qualified in-
staller or agency must use only factory-authorized kits or acces-
sories when modifying this product.
Fig. 1—Model 50SD
C99001
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Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1
6
Tab
6 8
PC 101
Printed in U.S.A.
Catalog No. 50SD-1SI
Pg 1
8-05
Replaces: New
