Carrier 48TC 04 Series, Service And Maintenance Instructions

Page: 34 / 152

34
COMPRESSOR
Lubrication
The compressor is charged with the correct amount of oil
at the factory.
UNIT DAMAGE HAZARD
Failure to follow this caution can result in damage to
components.
The compressor is in a Puron
R
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.
CAUTION
!
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in death,
serious personal injury and/or property damage.
Never use air or gases containing oxygen for leak
testing or for operating refrigerant compressors.
Pressurized mixtures of air or gases containing oxygen
can lead to an explosion.
!
WARNING
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in death,
serious personal injury and/or property damage
.
Never use non--certified refrigerants in this product.
Non--certified refrigerants could contain contaminates
that could lead to unsafe operating conditions. Use
ONLY refrigerants that conform to AHRI Standard
700.
!
WARNING
Replacing Compressor
NOTE : Only factory--trained service technicians should
remove and replace compressor units.
Compressor Mounting Bolts:
Compressor mounting
bolts should be periodically inspected for proper tightness.
Bolts should be tightened and have the torque set at 65--75
in/lbs (7.3 -- 8.5 Nm).
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 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
pressure 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 the filter drier whenever refrigerant system is
exposed to atmosphere. Only use factory specified
liquid--line filter driers with working pressures no less
than 650 psig (4482 kPa). Do not install a suction--line
filter drier in liquid line. A liquid--line filter drier designed
for use with Puron (R410) refrigerant and is required on
every unit.
Condenser--Fan Adjustment
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. 40.
5. Tighten setscrews 84 in-lbs (9.5 Nm).
6. Replace condenser--fan assembly.
C10323
Fig. 40 -- Condenser Fan Adjustment
48TC