45
PRE-START-UP
FIRE, EXPLOSION, ELECTRICAL SHOCK HAZARD
Failure to fol low this wa r ning c oul d result in personal
injury, dea th and/or prope rty damage :
1. Follow recognized s afety prac t ices and wear pr ot ec t ive
goggles when che cking or se rvicing a refrigerant system .
2. Do not ope rate the compr es sor or provi de a ny electric
powe r to the unit unless the compress or termina l c over is
in place and secured.
3. Do not r emove the compr essor termi nal cover until al l
electrica l s our ce s ar e di sconnecte d and tagged with loc kout
tags.
4. Rel ieve al l pre s sure fr om the sys t em before touching or
disturbing a nything i nside the t erm i nal box if a
refrigerant leak is sus pected around the c om pressor
terminals. Use accepted methods to re cover the
refrigerant.
5. Never attempt to repair a soldered connection while the
refrigerant system is unde r pressure.
6. Do not use a t orch to rem ove a ny com ponent. The
system cont ains oil and refrigera nt unde r pressure. To
remove a component, wear prot ective goggl es and proceed
as follows:
a. Shut off electrical power to the unit and tag
disconnect.
b. Recover refrigerant to relieve all pressure
from the system using both high-pressure
and low-pressure ports.
c. Cut component connection tubing with a
tubing cutter, and remove the component
from the unit.
d. Carefully unsweat the remaining tubing
stubs when necessary. Oil can ignite when
exposed to a 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 handling damages such as
broken lines, loose parts, or disconnected wires, etc.
b. Inspect for oil atall 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 connections.
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-fan blade are correctly
positioned in fan orifice. See Condenser-Fan Adjustment
section 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 miscellaneous loose parts
have been removed.
START-UP
Step 1 —Unit Preparation
Make sure that the unit has been installed in accordance with
installation instructions and applicable codes.
Step 2 —Gas Piping
Check gas piping for leaks.
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could cause personal
injury or death.
Disc onnect gas piping from unit when leak te s ting at
pressure greater than
1
/
2
psig. Pressures greater than
1
/
2
psig will cause gas valve damage resulting in hazardous
condition. If gas val ve is subjecte d to pre ss ur e greater tha n
1
/
2
psig, it must be replaced before use. When pressure
testing field- supplied gas piping at pressures of
1
/
2
psig
or le ss, a unit c onnec t ed to such pipi ng must be isolated by
ma nually closing the ga s va lve.
!
WARNING
Step 3 —Return--Air Filters
Make sure the correct filters are installed in the unit (See T able 1
or 2). Do not operate the unit without return-air filters.
Step 4 —Outdoor--Air Inlet Screens
Outdoor-air inlet screen(s) must be in place before operating the
unit.
Step 5 —Compressor Mounting
Compressors are internally spring mounted. Do not loosen or
remove the compressor holddown bolts.
Step 6 —Internal Wiring
Check all electrical connections in unit control boxes; tighten
them as required.
Step 7 —Refrigerant Service Ports
Each unit system has 4 Schrader-- type service ports: one on the
suction line, one on the liquid line, and 2 on the compressor
discharge line. Be sure that caps on the ports are tight. Two
additional Schrader valves are located under the high--pressure
and low--pressure switches, respectively.
Step 8 —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.
Larg e 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 .
Step 9 —Compressor Rotation
On 3-phase units be certain that the compressor is rotating in the
proper direction. To determine whether or not compressor is
rotating in the proper direction:
1. Connect the service gauges to suction and discharge
pressure fittings.
2. Energize the compressor.
3. The suction pressure should drop and the discharge
pressure should rise, as is normal on any start-up.
If the suction pressure does not drop and the discharge pressure
does not rise to normal levels:
1. Note that the indoor fan (006 and 007 three-phase units
only) is probably also rotating in the wrong direction.
48HE,HJ
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