Bryant 549B User Manual
Page 34
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34
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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, CAU-
TION, and INFORMATION labels attached to or
shipped with the unit.
3. Make the following inspections:
a. Inspect for shipping and handling damages such
as broken lines, loose parts, or disconnected wires.
b. Inspect for oil at all refrigerant tubing connections
and on the unit base. Detecting oil generally indi-
cates a refrigerant leak. Leak-test all refrigerant
tubing connections using an electronic leak detec-
tor, 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 that electrical component wiring
does not come in contact with refrigerant tubing.
d. Inspect coil fins. If damaged during shipping and
handling, carefully straighten the fins with a fin
comb.
4. Verify the following conditions:
a. Make sure that the outdoor-fan blades are cor-
rectly positioned in the fan orifice. Refer to the
Outdoor-Fan Adjustment section on page 37 for
more details.
b. Make sure that the air filter(s) is in place.
c. Make sure that the 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
I. UNIT PREPARATION
Make sure that the unit has been installed in accordance
with these installation instructions and applicable codes.
Make sure that the Start-Up Checklist, located on the back
page of this manual, has been completed and filled out.
II. RETURN-AIR FILTERS
Make sure that the correct air filters are installed in the unit
(see Table 1). Do not operate the unit without return-air
filters.
III. OUTDOOR-AIR INLET SCREENS
Outdoor-air inlet screen must be in place before operating the
unit.
IV. COMPRESSOR MOUNTING
Compressors are internally spring mounted. Do not loosen or
remove compressor holddown bolts.
V. INTERNAL WIRING
Check all electrical connections in the unit control boxes;
tighten as required.
VI. REFRIGERANT SERVICE PORTS
Each refrigerant system has 3 Schrader-type service gage
ports: one on the suction line, one on the cooling mode liquid
line, and one on the compressor discharge line.
Be sure that caps on the ports are tight. The port on the cool-
ing mode liquid line and one port on the discharge line have
protective devices installed on them.
A. High-Flow Refrigerant Valves
These are two high flow valves; one is located on the hot gas
tube coming out of the compressor. The second is located on
the suction tube going into the compressor. Large black plas-
tic caps with O-rings inside identify these valves. No field
access to these valves is available at this time. Ensure that
the plastic caps remain on the valves and are tight or the
possibility of refrigerant leakage could occur.
VII. COMPRESSOR ROTATION
It is important to be certain that the scroll compressor is
rotating in the proper direction. To determine whether or not
compressor is rotating in the proper direction:
1. Connect service gages to the 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 pres-
sure does not rise to normal levels:
1. Note that the indoor fan is probably also rotating in
the wrong direction.
2. Turn off power to the unit and tag disconnect.
3. Reverse any two of the unit power leads.
4. Turn on power to the unit and re-energize compres-
sor.
The suction and discharge pressure levels should now move
to their normal start-up levels.
NOTE: When the compressor is rotating in the wrong direc-
tion, the unit makes more noise and does not provide heating/
cooling. Compressor failure will occur if rotation direction is
not corrected.
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 servicing
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 the compressor terminal cover
until all electrical sources are disconnected and
tagged.
4. Relieve all pressure from the system before
touching or disturbing anything inside the com-
pressor terminal box if a refrigerant leak is sus-
pected around the compressor terminals. Use
accepted methods to recover refrigerant.
5. Never attempt to repair a soldered connection
while the refrigerant system is under pressure.
6. Do not use a torch to remove any component.
The system contains oil and refrigerant under
pressure. To remove a component, wear protec-
tive goggles and proceed as follows:
a. Shut off electrical power to the unit.
b. Recover refrigerant to relieve all pressure
from the system using both high-pressure
and low-pressure ports.
c. Cut the 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 torch flame.