Bryant 548F - Manual (Page 37)

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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 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- and factory-wiring connections.
Be sure that connections are completed and tight.
Ensure that wiring does not contact refrigerant
tubing or sharp metal 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 outdoor-fan blades are correctly
positioned in fan orifice. Refer to Outdoor-Fan
Adjustment section on page 39 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.
e. Ensure wires do not come in contact with refriger-
ant tubing.
START-UP
I. UNIT PREPARATION
Make sure that unit has been installed in accordance with
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 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.
V. INTERNAL WIRING
Check all electrical connections in unit control boxes; tighten
as required.
VI. REFRIGERANT SERVICE PORTS
Each unit system has 3 Schrader-type service ports: one on
the suction line, one on the liquid line, and one on the com-
pressor discharge line. Be sure that caps on the ports are
tight.
VII. HIGH FLOW VALVES
Located on the compressor hot gas and suction tubes are
High Flow Valves. Large black plastic caps distinguish 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 possibility of refrigerant
leakage could occur.
VIII. COMPRESSOR ROTATION
On 3-phase (sizes 048, 060 and 072) units it is important to
be certain 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 indoor fan (060 and 072 three-phase
units only) 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 energize compressor.
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 cooling.
IX. COOLING
Set space thermostat to OFF position. Set system selector
switch at COOL position and fan switch at AUTO position.
Adjust thermostat to a setting below room temperature.
Compressor starts on closure of contactor.
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.
4. Relieve all pressure from system before touch-
ing or disturbing anything inside compressor
terminal box if refrigerant leak is suspected
around compressor 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.
b. Recover refrigerant to relieve all pressure
from system using both high- and low-pres-
sure ports.
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.