Carrier 48SX024-048 - Manual

48SS018-060
48SX024-048
Packaged Gas Heating/
Electric Cooling Units
t
COMMERCIAL
UNITARY
SYSTEMS
Installation, Start-Up and
Service Instructions
CONTENTS
SAFETY CONSIDERATIONS ...........................
General .............................................................
RECEIVING AND INSTALLATION...................
Step 1 — Check Equipment .........................
• IDENTIFY UNIT
• INSPECT SHIPMENT
Step 2 — Provide Unit Support.......................
• ROOF CURB
• SLAB MOUNT
• FLUSH MOUNT
Step 3 — Field Fabricate Ductwork . . . .
Step 4 ~ Provide Clearances...........................
Step 5 — Rig and Place Unit ..........................
• UNITS WITHOUT BASE RAIL
• UNITS WITH OPTIONAL BASE RAIL
Step 6 — Connect Condensate Drain ...
Step 7 — Install Flue Hood..............................
Step 8 — Install Gas Piping ............................
Step 9 - Install Duct Connections ................
• CONFIGURING UNITS FOR DOWNFLOW
(VERTICAL) DISCHARGE
Step 10 — Install Electrical Connections .
• HIGH-VOLTAGE CONNECTIONS
• SPECIAL PROCEDURES FOR 208-V
OPERATION
• CONTROL VOLTAGE CONNECTIONS
• HEAT ANTICIPATOR SETTING
• TRANSFORMER PROTECTION
PRE-START-UP ...............................................
START-UP . . ............................
MAINTENANCE.................................................
START-UP CHECKLIST...................................
Page
. 1-9
.. 1
10-20
. , 10
10
10
10
10
13
13
13
16
18
. . 21
21-38
39-44
. CL-1
NOTE TO INSTALLER — Before the installation, READ
THESE INSTRUCTIONS CAREFULLY AND COM­
PLETELY. 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 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.
Fig. 1 — Typical 48SS Unit Shown
Follow all safety codes. Wear safety glasses and work
gloves. Use quenching cloth for unbrazing operations. Have
fire extinguisher available for all brazing operations.
A WARNING
Improper installation, adjustment, alteration, service,
maintenance, or use can cause carbon monoxide poi­
soning, fire, or an explosion which can result in
personal injury or unit damage. Consult a qualified
installer, service agency, or gas supplier for informa­
tion or assistance. The qualified installer or agency must
use only factory-authorized kits or accessories when mod­
ifying this product.
A WARNING
Before performing service or maintenance operations
on unit, turn off gas supply then unit main power switch.
Electrical shock could cause personal injury.
General — The 48SS,SX units (see Fig. 1) are fully self-
contained, combination gas heating/electric cooling units
designed for outdoor installation. See Fig. 2-9 for unit di­
mensions. All unit sizes have discharge openings for both
horizontal and downflow configurations, and are factory
shipped with all 4 duct openings covered. Units may be in­
stalled 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, specifications or designs without notice and without incurring obligations.
Book|1 |4 PC 111 Catalog No 534-842 Printed in U S A Form 48SS,SX-2SI Pg 1 5-94 Replaces: 48SS,SX-1 SI
Tab la 6a