50GL
3-Phase Single-Packaged Air Conditioner
with Puron® (R-410A) Refrigerant
Installation, Start-Up, and Operating Instructions
Sizes 030-060
NOTE:
Read the entire instruction manual before starting the
installation.
TABLE OF CONTENTS
Index
Page
SAFETY CONSIDERATIONS .....................................................1
RULES FOR SAFE INSTALLATION AND OPERATION....1-4
GENERAL ................................................................................4
RECEIVING AND INSTALLATION .....................................4-10
CHECK EQUIPMENT ..................................................................4
IDENTIFY UNIT......................................................................4
INSPECT SHIPMENT .............................................................4
PROVIDE UNIT SUPPORT .........................................................4
ROOF CURB ............................................................................4
SLAB MOUNT.........................................................................4
GROUND LEVEL....................................................................4
FIELD FABRICATE DUCTWORK.............................................4
PROVIDE CLEARANCES ...........................................................4
RIG AND PLACE UNIT ..............................................................4
INSPECTION............................................................................4
INSTALLATION ..................................................................4-6
CONNECT CONDENSATE DRAIN ...........................................6
INSTALL DUCT CONNECTIONS ..........................................6-8
CONFIGURING UNITS FOR DOWNFLOW (VERTICAL)
DISCHARGE ..............................................................................7-8
INSTALL ELECTRICAL CONNECTIONS...........................8-10
HIGH-VOLTAGE CONNECTIONS..................................8-10
STANDARD CONNECTION................................................10
SPECIAL PROCEDURES FOR 208-V OPERATION.........10
CONTROL VOLTAGE CONNECTIONS ............................10
TRANSFORMER PROTECTION .........................................10
PRE-START-UP ..........................................................................11
START-UP..............................................................................11-14
MAINTENANCE....................................................................15-20
TROUBLESHOOTING ...............................................................22
START-UP CHECKLIST............................................................23
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.
Before performing service or maintenance operations on
system, turn off power to unit. Turn off accessory heater
power switch, if applicable. Electrical shock can cause
serious injury or death.
Puron (R-410A) systems operate at higher pressures than
standard R-22 systems. Do not use R-22 service equipment or
components on Puron (R-410A) equipment. Ensure service
equipment is rated for Puron (R-410A).
RULES FOR SAFE INSTALLATION AND OPERATION
Recognize safety information. This is the safety-alert symbol
.
When you see this symbol in instructions or manuals, be alert to
the potential for personal injury.
Understand the signal words DANGER, WARNING, CAUTION,
IMPORTANT, and NOTE. These words are used with the safety-
alert symbol. DANGER identifies the most serious hazards which
will
result in severe injury or death. WARNING signifies a hazard
which
could
result in serious injury or death. CAUTION is used to
identify unsafe practices which
would
result in minor personal
Fig. 1—Model 50GL
C99064
Visit www.carrier.com
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 1a
PC 101
Printed in U.S.A.
Catalog No. 50GL-2SI
Pg 1
2-06
Replaces: New
