Compressors

Lubrication

Compressors are charged with the correct amount of oil at the factory.

!CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in damage to components.

The compressor is in a PuronR refrigerant system and uses a polyolester (POE) oil. This oil is extremely hygroscopic, meaning it absorbs water readily. POE oils can absorb 15 times as much water as other oils designed for HCFC and CFC refrigerants. Avoid exposure of the oil to the atmosphere.

!WARNING

PERSONAL INJURY AND ENVIRONMENTAL HAZARD

Failure to follow this warning could result in personal injury or death.

Relieve pressure and recover all refrigerant before system repair or final unit disposal.

Wear safety glasses and gloves when handling refrigerants.

Keep torches and other ignition sources away from refrigerants and oils.

Replacing Compressor

The compressor used with Puron refrigerant contains a POE oil. This oil has a high affinity for moisture. Do not remove the compressor’s tube plugs until ready to insert the unit suction and discharge tube ends.

Compressor mounting bolt torque is 65-75 in-lbs (7.3-8.5 N-m).

Compressor Rotation

On 3-phase units with scroll compressors, 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 gauges 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.

NOTE: If the suction pressure does not drop and the discharge pressure does not rise to normal levels:

4.Note that the evaporator fan is probably also rotating in the wrong direction.

5.Turn off power to the unit.

6.Reverse any two of the unit power leads.

7.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

 

direction, the unit makes an elevated level of noise and

 

does not provide cooling.

 

Filter Drier

 

Replace whenever refrigerant system is exposed to

 

atmosphere. Only use factory specified liquid-line filter

 

driers with working pressures no less than 650 psig. Do

 

not install a suction-line filter drier in liquid line. A

 

liquid-line filter drier designed for use with Puron

 

refrigerant is required on every unit.

 

48TC

Condenser-Fan Adjustment (D08-D12 size)

1.

Shut off unit power supply. Install lockout tag.

2.

Remove condenser-fan assembly (grille, motor, and

 

 

 

 

fan).

 

3.

Loosen fan hub setscrews.

 

4.

Adjust fan height as shown in Fig. 14.

 

5.

Tighten setscrews to 84 in-lbs (9.5 N-m).

 

6.

Replace condenser-fan assembly.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CONDUIT

0.14 in +0.0/-0.03

C08448

Fig. 14 - Condenser Fan Adjustment (D08-D12)

Condenser-Fan Adjustment (D14 size)

1.Shut off unit power supply. Install lockout tag.

2.Remove condenser fan grille.

3.Loosen fan hub setscrews.

4.Adjust fan height as shown in Fig. 15.

5.Tighten setscrews to 84 in-lbs (9.5 N-m).

6.Replace fan grille.

C09094

Fig. 15 - Condenser Fan Adjustment (D14)

Troubleshooting Cooling System

Refer to Table 1 for additional troubleshooting topics.

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Carrier 48TC*D08 Compressors, Filter Drier, Condenser-Fan Adjustment D08-D12 size, Condenser-Fan Adjustment D14 size