Carrier 38AH044-134 - Manual

É,
38AH044-134
Air-Cooled Condensing Units
50/60 Hz
COMMERCIAL
UNITARY
SYSTEMS
Installation, Start-Up and
Service Instructions
CONTENTS
SAFETY CONSIDERATIONS.....................
INSTALLATION.........................................
Step 1 — Rig and Place Unit....................
• DOMESTIC UNITS
• EXPORT UNITS
• PLACING UNITS
Step 2 — Check Compressor Mounting
• UNITS 38AH044-084
• UNITS 38AH094-I34
Step 3 — Make Refrigerant Piping
Connections .............................................
• UNITS 38AH044-084
• UNITS 38AH094-134
Step 4 — Make Electricai Connections
• POWER SUPPLY
• FIELD POWER CONNECTIONS
• MAIN POWER
• CONTROL CIRCUIT WIRING
Step 5 — Instali Accessories .................
• LOW-AMBIENT OPERATION
• MISCELLANEOUS ACCESSORIES
PRE-START-UP .......................................
START-UP ................................................
SERViCE....................................................
CONTROL .................................................
TROUBLESHOOTING ..............................
START-UP CHECKLIST ...................
Page
... 1
. 1-37
... 1
13
23
37
............37
........ 37-43
........ 44-47
........47-50
..........51,52
CL-L CL-2
SAFETY CONSIDERATIONS
Installing, starting up, and servicing this equipment can
be hazardous due to system pressures, electrical compo­
nents, and equipment location (roofs, elevated structures, etc.).
Only trained, qualified installers and service mechanics
should install, start up, and service this equipment.
Untrained personnel can perform basic maintenance func­
tions, such as cleaning coils. All other operations should be
performed by trained service personnel.
When working on the equipment, observe precautions in
the literature, and on tags, stickers, and labels attached to the
equipment and any other safety precautions that may apply.
• Follow all safety codes.
• Wear safety glasses and work gloves.
• Use care in handling, rigging, and setting bulky
equipment.
S till ELECTRIC SHOCK HAZARD.
eg
Open all remote disconnects before servicing
this equipment.
INSTALLATION
Step 1 — Rig and Place Unit — All units are de­
signed for overhead rigging, and it is important that this method
be used. Lifting holes are provided in the frame base rails,
which are marked for rigging (see rigging label on the unit
and Tables 1, 2A, and 2B for rigging weights and center of
gravity). It is recommended that field-supplied pipes, of suf­
ficient length to extend at least 12-in. (305 mm) beyond the
frame, be passed through the holes.
To maintain unit stability while lifting, use 4 cables,
chains, or straps of equal length. Attach one end of
each cable to one pipe end and the other end of each
cable to the overhead rigging point.
Use spreader bars or frame to keep the cables, chains,
and straps clear of the unit sides. Leave standard coil pro­
tection packaging in place during rigging to provide protec­
tion to coils. Remove and discard all coil protection after
rigging cables are detached.
DOMESTIC UNITS — For units 38AH044-084, 124, and
134; standard unit packaging consists of coil protection only.
There is no standard packaging provided for units 38AH094
and 104. Skids are not provided. If overhead rigging is not
available at the jobsite, place the unit on a skid or pad before
dragging or rolling. When rolling, use a minimum of
3 rollers. When dragging, pull the pad or skid. Do not apply
force to the unit. When in final position, raise from above to
lift unit off the pad or skid.
EXPORT UNITS — All export units are mounted on skids
with vertical coil protection. Leave the unit on the skid until
it is in final position. While on the skid, the unit can be rolled
or skidded. Apply force to the skid, not to the unit. Use a
minimum of 3 rollers when rolling. When in final position,
raise from above to remove the skid.
PLACING UNITS
Units 38AH044-084 — Refer to Fig. 1 and 2 for airflow clear­
ances. Recommended minimum clearances are 6 ft (1829 mm)
for unrestricted airflow and service on sides of unit, 5 ft
(1524 mm) on ends, and unrestricted clear air space above
the unit. Provide ample space to connect liquid and suction
lines to indoor unit. For multiple units, allow 8 ft (2440 mm)
separation between units for airflow and service.
A CAUTION
Do not forklift these units unless the unit is attached to
a skid designed for forklifting.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obiigations.
Book 11 PC 111 Catalog No 533-812 Printed in U.S A. Form 38AH-14SI Pg 1 5-96 Replaces: 38AH-13SI
Tab 3a