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PRE-START-UP
Proceed as follows to inspect and prepare the unit for initial
start-up:
1. Remove all access panels.
2. Read and follow instructions on all WARNING,
CAUTION, and INFORMATION labels attached to,
or shipped with, unit.
3. Make the following inspections:
a. Inspect for shipping and handling damages such
as broken lines, loose parts, disconnected wires,
etc.
b. Inspect for oil at all refrigerant tubing connections
and on unit base. Detecting oil generally indicates
a refrigerant leak. Leak-test all refrigerant tubing
connections using electronic leak detector, halide
torch, or liquid-soap solution.
c. Inspect all field-wiring and factory-wiring connec-
tions. Be sure that connections are completed and
tight. Ensure electrical wires do not come in con-
tact with refrigerant lines or sharp edges.
d. Inspect coil fins. If damaged during shipping and
handling, carefully straighten fins with a fin comb.
4. Verify the following conditions:
a. Make sure that condenser-fan blade is positioned
correctly in fan orifice. Blades should clear fan
motor and fan orifice ring.
b. Make sure that air filters are in place. (See
Tables 1A and 1B.) Do not operate unit without
return-air filters.
c. Make sure that the condensate drain pan and
trap are filled with water to ensure proper
drainage.
d. Make sure that all tools and miscellaneous loose
parts have been removed.
e. Make sure outdoor-air inlet screens are in place.
5. Compressors are internally spring mounted. Do not
loosen or remove compressor holddown bolts.
6. Each unit system has 3 Schrader-type service ports:
one on the suction line, one on the liquid line and one
on the compressor discharge line. Be sure that caps
on the ports are tight.
7. Ensure electrical wires do not make contact with
refrigerant lines.
START-UP
I. UNIT PREPARATION
Make sure that unit has been installed in accordance with
these installation instructions and applicable codes. Ensure
Start-Up Checklist on back page of booklet is completely
filled out.
II. RETURN-AIR FILTERS
Make sure correct air filters are installed in unit (see
Tables 1A and 1B). Do not operate unit without return-air
filters.
III. OUTDOOR-AIR INLET SCREENS
Outdoor-air inlet screen(s) must be in place before operating
unit.
IV. COMPRESSOR MOUNTING
Compressors are internally spring mounted. Do not loosen or
remove compressor holddown bolts. Remove the tiedown
bands that hold the compressors together on
558F103,121,150,151 units.
V. INTERNAL WIRING
Check all electrical connections in unit control boxes; tighten
as required. Verify and correct if necessary. Ensure that elec-
trical component wiring does not come in contact with refrig-
erant tubing or sharp edges.
VI. REFRIGERANT SERVICE PORTS
To service refrigerant service ports, remove compressor
access panel. Each unit system has 3 Schrader-type service
gage ports: one on the suction line, one on the liquid line, and
one on the compressor discharge line. Be sure that caps on
the ports are tight. The Schrader-type valve on the discharge
line is located under the low-pressure switch. Another valve
is located on the discharge line underneath the high-
pressure switch. It is screwed on a Schrader fitting but there
is no Schrader core.
A. High Flow Refrigerant Valves
Two high flow valves are located on the hot gas tube coming
out of the compressor and the suction tube going into the
compressor. Large black plastic caps identify these valves.
These valves have O-rings inside which screw the cap onto a
brass body to prevent leaks. No field access to these valves is
available at this time. Ensure the plastic caps remain on the
valves and are tight or the possibility of refrigerant leakage
could occur.
VII. COMPRESSOR ROTATION
On 3-phase scroll compressor units (103,121,150,151), it is
important to be certain compressor is rotating in the proper
direction. To determine whether or not compressor is rotat-
ing in the proper direction:
1. Connect service gages to suction and discharge pres-
sure fittings.
WARNING: Failure to observe the following warn-
ings could result in serious personal injury:
1. Follow recognized safety practices and wear
protective goggles when checking or the servic-
ing refrigerant system.
2. Do not operate the compressor or provide any
electric power to the unit unless the compressor
terminal cover is in place and secured.
3. Do not remove compressor terminal cover until
all electrical sources are disconnected.
4. Relieve all pressure from system before touch-
ing or disturbing anything inside terminal box
if refrigerant leak is suspected around compres-
sor terminals. Use accepted methods to recover
refrigerant.
5. Never attempt to repair soldered connection
while refrigerant system is under pressure.
6. Do not use torch to remove any component. The
system contains oil and refrigerant under pres-
sure. To remove a component, wear protective
goggles and proceed as follows:
a. Shut off electrical power to unit.
b. Recover refrigerant to relieve all pressure
from system using both high-pressure and
low-pressure ports.
c. Cut component-connecting tubing with
tubing cutter and remove component from
unit.
d. Carefully unsweat remaining tubing stubs
when necessary. Oil can ignite when exposed
to torch flame.