Bryant 581A Pre-Start-Up, Unit Preparation, II. Compressor Mounting, IV. Crankcase Heaters

PRE-START-UP

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 the servic- ing 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.

4.Relieve all pressure from the system before touching or disturbing anything inside the compressor terminal box if refrigerant leak is suspected around the compressor terminals.

5.Never attempt to repair a soldered connection while the refrigerant system is under pressure.

6.Do not use torch to remove any component. The system contains oil and refrigerant under pres- sure. To remove a component, wear protective goggles and proceed as follows:

a.Shut off gas and then electrical power to the unit. Install lockout tag.

b.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.

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, etc.

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 an 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 the fins with a fin comb.

4.Verify the following conditions:

a.Make sure that condenser fan blade is correctly positioned in the fan orifice. See Condenser-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.

START-UP

Use the following information and Start-Up Checklist on page CL-1 to check out unit PRIOR to start-up.

I. UNIT PREPARATION

Check that unit has been installed in accordance with these installation instructions and all applicable codes.

II. COMPRESSOR MOUNTING

Compressors are internally spring mounted. Do not loosen or remove compressor holddown bolts.

III. REFRIGERANT SERVICE PORTS

Each independent refrigerant system has a total of 3 Schrader-type service gage ports per circuit. One port is located on the suction line, one on the compressor discharge line, and one on the liquid line. Be sure that caps on the ports are tight.

IV. CRANKCASE HEATER(S)

Crankcase heaters are energized as long as there is power to the unit and the compressor is not operating.

IMPORTANT: Unit power must be on for 24 hours prior to start-up. Otherwise, damage to compressor may result.

V. COMPRESSOR PHASING

WARNING: Improper wiring will cause compres- sor stoppage and may cause equipment damage. Cor- rect wiring by switching leads as indicated below.

On 3-phase units, it is important to be certain the compres- sors are rotating in the proper direction. To determine whether or not compressors are rotating in the proper direc- tion, use a phase-rotation meter on the unit input power to check for L1-L2-L3 or clockwise rotation. If the compressor is rotating in the wrong direction, the suction pressure will not drop and the discharge pressure will not rise.

NOTE: Indoor or outdoor fan rotation direction may not indi- cate proper input power phase sequence, as some 3-phase units use single-phase fan motors. Check fan rotation where applicable.

To correct the wrong compressor rotation direction, perform the following procedure:

1.Turn off power to the unit and lock out the power.

2.Switch any two of the incoming unit power leads.

3.Turn on power to the unit.

4.Verify corrected compressor rotation and fan rotation where applicable.

VI. INTERNAL WIRING

Check all electrical connections in unit control boxes; tighten as required.

VII. EVAPORATOR FAN

Fan belt and variable pulleys are factory-installed. See Tables 5-23 for fan performance data. Be sure that fans rotate in the proper direction. See Table 24 for air quantity limits. See Table 25 for evaporator fan motor specifications. See Table 26 for accessory or factory-installed options static pressure. See Table 27 for fan rpm at various motor pulley settings. To alter fan performance, see Evaporator Fan Per- formance Adjustment section on page 39.

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