15
Compressors
Lubrication
Compressors are cha rged with the correct amount of oil at
the factory.
UNIT DAMAGE HAZARD
Failure to follow this caution may result in damage to
compone nts.
The c ompressor is in a PuronR refrigerant system and
uses a polyolester (POE) oil. This oil is extremely
hygroscopic, mea ning 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.
CAUTION
!
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.
!
WARNING
Replacing Compressor
The compressor used with Puron refrigerant contains a
POE oil. This oil has a high affinity for moisture. Do not
remove the c ompressor’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 ce rtain 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 t he 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 t o normal levels:
4. Note t hat the evaporator fan is probably also rot ating
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 com pressor.
The sucti on 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 le ss 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.
Condenser-- Fan Adjustment (D08-- D12 size)
1. Shut off unit power supply. Install lockout tag.
2. Remove conde nser-fan assembly (grille, motor, a nd
fan).
3. Loosen fan hub setscrews.
4. Adjust fa n 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 c ondenser fan grille.
3. Loosen fan hub setscrews.
4. Adjust fa n 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 t o Table 1 for additional troubleshooting topics.
48TC
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