Bryant DURAPAC PLUS 551B, Installation, Start-Up And Service Instructions Manual

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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 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 connec-
tions and on unit base. Detecting oil generally
indicates a refrigerant leak. Leak-test all refrig-
erant tubing connections using electronic leak
detector, halide torch, or liquid-soap solution.
c. Inspect all field-wiring and factory-wiring con-
nections. Be sure that connections are completed
and tight.
d. Inspect coil fins. If damaged during shipping and
handling, carefully straighten fins with a fin
comb.
4. Verify the following:
a. Make sure that condenser-fan blades are
correctly positioned in fan orifice. Refer to
Condenser-Fan Adjustment section on page 42
for more details.
b. Make sure that air filters are 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.
e. Make sure that the start-up checklist has been
performed and filled out.
NOTE: Ensure wiring does not contact any refrigerant
tubing.
START-UP
I. UNIT PREPARATION
Make sure that unit has been installed in accordance with
these installation instructions and applicable codes.
II. RETURN-AIR FILTERS
Make sure correct filters are installed in unit (see Table 1).
Do not operate unit without return-air filters.
III. OUTDOOR-AIR INLET SCREENS
Outdoor-air inlet screens must be in place before operating
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 unit control boxes; tighten
as required.
VI. REFRIGERANT SERVICE PORTS
Each refrigerant system has 4 Schrader-type service gage
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.
VII. HIGH FLOW VALVES
Two high flow refrigerant valves are located on the compres-
sor hot gas and suction tubes. Large black plastic caps dis-
tinguish these valves with o-rings located inside the caps.
These valves can not be accessed for service in the field.
Ensure the plastic caps are in place and tight or the possibil-
ity of refrigerant leakage could occur.
VIII. COMPRESSOR ROTATION
On 3-phase units, it is important to be certain 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 suction and discharge pres-
sure 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 evaporator fan is probably also rotating
in the wrong direction.
2. Turn off power to the unit and install lockout tag.
3. Reverse any two of the unit power leads.
4. Turn on power to the unit.
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 an elevated level of noise and does not
provide heating or cooling.
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 compressor or provide any elec-
tric power to unit unless compressor terminal
cover is in place and secured.
3. Do not remove compressor terminal cover until
all electrical sources are disconnected and prop-
erly tagged.
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. Sys-
tem 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 and install
lockout tag.
b. Relieve all pressure from system using
both high and low-pressure ports. Use
accepted methods to recover refrigerant.
c. Cut component connection tubing with tub-
ing cutter and remove component from
unit.
d. Carefully unsweat remaining tubing stubs
when necessary. Oil can ignite when
exposed to torch flame.
CAUTION: Compressor damage will occur if rota-
tion is not immediately corrected.