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PRE--START--UP
PERSONAL INJURY HAZARD
Failure to follow this warning could result in personal
injury or death.
1. Follow recognized safety practices and wear pro-
tective goggles when checking or servicing refri-
gerant system.
2. Do not operate compressor or provide any electric
power to unit unless compressor terminal cover is
in place and secured.
3. Do not remove compressor terminal cover until
all electrical sourcesare disconnected.
4. Relieve all pressure from system before touching
or disturbing anything inside terminal box if refri-
gerant leak is suspected around compressor ter-
minals.
5. Never attempt to repair soldered connection while
refrigerant system is under pressure.
6. Do not use torch to remove any component. Sys-
tem contains oil and refrigerant under pressure.
To remove a component, wear protective goggles
and proceedas follows:
a. Shut off electrical power and then gas to unit.
b. Recover refrigerant to relie ve all pressure from
system using both high--pressure and low
pressure ports.
c. Cut component connec tion tubing with tubing
cutter and remove component from unit.
d. Carefully unsweat remaining tubing stubs
when necessary.Oil canignite when exposed
to torch flame.
!WARNING
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 handlingdamages such
as brokenlines, loose parts, or disconnected
wires,etc.
b. Inspect for oil at all refrigerant tubing connec-
tions andon unit base. Detecting oil generally
indicates a refrigerantleak. Leak--test all refri-
gerant tubing connections using electronic leak
detector, halide torch, or liquid--soapsolution.
c. Inspect all field--wiringand factory--wiringcon-
nections. Be sure that connections are completed
and tight. Be sure that wires are not in contact
with refrigerant tubing 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--fanbla de are correctly
positioned in fan orifice. See Condenser--Fan
Adjustmentsection for more details.
b. Make sure that air filter(s) is in place.
c. Make sure that condensate drain trap is filled
with water to ensure proper drainage.
d. Make sure that all tools and miscell aneous loose
parts have been removed.
START--UP,GENERAL

Unit Preparation

Make sure that unit hasbeen installed in accordance with
installationinstructions and applicable codes.

Gas Piping

Check gaspiping for leaks.
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could result in personal
injury or death.
Disconnect gas piping from unit when leak testing at
pressure greater than 1/2 psig. Pressuresgreater than
1/2 psig will cause gas valve damage resulting in
hazardous condition. If gas valve is subjected to
pressure greater than 1/2 psig, it must be replaced
before use. When pressure testingfield --supplied gas
piping at pressures of 1/2 psig or less, a unit connected
to such piping must be isolated by manually closing
the gasvalve.
!WARNING

Return--AirFilters

Make sure correct filters are installed in unit (see
Appendix II --Physical Data). Do not operate unit without
return--air filters.

Outdoor--AirInlet S creens

Outdoor--airinlet screen must be in place be foreopera ting
unit.

CompressorMounting

Compressors are internally spring mounted. Do not loosen
or remove compressor hold down bolts.

Internal Wiring

Check all electrical connections in unit control boxes.
Tighten as required.

Refrigerant Service Ports

Each unit system has two 1/4” SAE flare (with check
valves) service ports: one on the suction line, and one on
the compressor discharge line. Be sure that caps on the
ports are tight.

CompressorRotation

On 3--phaseunits with scroll compressors, it is important
to be certain compressor is rotating in the proper
48TC