Bryant 548F User Manual download pdf (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.

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Bryant 548F User Manual Page 37

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