Bryant 581B Ð Filter Installed on Outdoor-AirHood, Pre-Start-Up, Start-Up I. Compressor Rotation

Fig. 30 Ð Filter Installed on Outdoor-Air Hood

PRE-START-UP

WARNING: Failure to observe the following warn- ings could result in serious personal injury:

1.Follow recognized safety practices and wear pro- tective goggles when checking or servicing refrig- erant system.

2.Do not operate compressor or provide any electric power to unit unless compressor terminal cover is in place and secured.

3.Do not remove compressor terminal cover until all electrical sources have been disconnected.

4.If refrigerant leak is suspected around compres- sor terminals, relieve all pressure from system before touching or disturbing anything inside ter- minal box.

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 pressure. To remove a component, wear protective goggles and proceed as follows:

a.Shut off gas supply and then electrical power to unit.

b.Reclaim refrigerant to relieve all pressure from system using both high- and low-pressure ports.

c.Cut component-connecting tubing with tubing cutter and remove component from unit.

d.Carefully unsweat remaining tubing stubs when necessary. Oil can ignite when exposed to torch ¯ame.

Proceed as follows to inspect and prepare the unit for initial startup:

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, disconnected wires, etc.

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. If refrigerant leak is de- tected, see Refrigerant Leaks section on page 30.

c.Inspect all ®eld- and factory-wiring connections. Be sure that connections are completed and tight.

d.Inspect coil ®ns. If damaged during shipping and han- dling, carefully straighten ®ns with a ®n comb.

4.Verify the following conditions:

DANGER: Do not purge gas supply into the com- bustion chamber. Do not use a match or other open flame to check for gas leaks. Failure to adhere to this warn- ing could result in an explosion causing personal in- jury or death.

a.Make sure that gas supply has been purged, and that all gas piping has been checked for leaks.

b.Make sure that condenser-fan blade is correctly po- sitioned in fan ori®ce. Blades should clear fan motor and fan ori®ce ring.

c.Make sure that correct air ®lters are in place. (See Table 1.) Do not operate unit without return-air ®lters.

d.Make sure that condensate drain pan and trap are ®lled with water to ensure proper drainage.

e.Make sure that all tools and miscellaneous loose parts have been removed.

f.Make sure outdoor-air inlet screen is in place.

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

6.Each unit system has 4 Schrader-type gage ports: one on the suction line, one on the compressor discharge line, and two additional Schrader valves located under the high-pressure and low-pressure switches. Be sure that caps on the ports are tight.

Unit is now ready for initial start-up.

START-UP

I. COMPRESSOR ROTATION

On 3-phase units it is important to be certain the scroll com- pressor 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 ®ttings.

2.Energize the compressor.

3.The suction pressure should drop and the discharge pres- sure 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 (006 and 007 only) is prob- ably also rotating in the wrong direction.

2.Turn off power to the unit.

3.Reverse any 2 of the unit power leads.

4.Reapply power to the 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 will make an elevated level of noise and will not provide cooling.

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