14
COMPRESSOR
Lubrication
The compressor is charged with the correct amount of oil at the
factory.
Replacing Compressor
NOTE: Only factory-trained service technicians should remove
and replace compressor units.
Compressor Rotation
NOTE: When the compressor is rotating in the wrong direction,
the unit makes an elevated level of noise and does not provide
cooling.
On 3-phase units with scroll compressors, it is important to be cer-
tain compressor 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 pressure
fittings.
2. Energize the compressor.
3. The suction pressure should drop and the discharge pres-
sure 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, the evaporator fan is prob-
ably also rotating in the wrong direction.
4. Turn off power to the unit.
5. Reverse any two of the three unit power leads.
6. Reapply electrical power to the compressor. The suction
pressure should drop and the discharge pressure should
rise which is normal for scroll compressors on start-up.
7. Replace compressor if suction/discharge pressures are not
within specifications for the specific compressor.
The suction and discharge pressure levels should now move to
their normal start-up levels.
Filter Drier
Replace whenever refrigerant system is exposed to atmo-
sphere. Only use factory specified liquid-line filter driers with
working pressures no less than 650 psig. Do not install a suc-
tion-line filter drier in liquid line. A liquid-line filter drier de-
signed for use with Puron refrigerant 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).
See Fig. 26.
3. Loosen fan hub setscrews.
4. Adjust fan height by pushing fan until it stops on the fan
shaft.
5. Tighten set screw to 60 in.-lb (6.78 Nm).
6. Replace condenser-fan assembly. When replacing the con-
denser-fan assembly follow the screw pattern sequence
shown in Fig. 27. The screws must be replaced in the
sequence shown in the figure.
Fig. 26 — Condenser Fan Adjustment
CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution may result in damage to com-
ponents.
The compressor is in a Puron
®
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 atmo-
sphere.
WARNING
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.
CAUTION
INSTALLATION SITE DAMAGE
Failure to follow this caution can result in damage to equip-
ment location site.
Puron (R-410A) refrigerant contains polyolester (POE) oil
that can damage the roof membrane. Caution should be tak-
en to prevent POE oil from spilling onto the roof surface.
The factory also recommends that the suction and discharge
lines be cut with a tubing cutter instead of using a torch to
remove brazed fittings.
CAUTION
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution can result in premature wear
and damage to equipment.
Scroll compressors can only compress refrigerant if rotat-
ing in the right direction. Reverse rotation for extended
times can result in internal damage to the compressor.
Scroll compressors are sealed units and cannot be repaired
on site location.
Summary of Contents for 551K 04N Series
Page 15: ...15 Fig 27 Condenser Fan Assembly Screw Pattern Sequence 1 2 3 4 5 NO SCREW Blank Tab ...
Page 82: ...82 APPENDIX D WIRING DIAGRAMS Fig E 551K 04 06 208 230 1 60 Unit with RTU Open Controller ...
Page 83: ...83 APPENDIX D WIRING DIAGRAMS Fig F 551K 04 06 208 230 3 60 Unit with RTU Open Controller ...
Page 84: ...84 APPENDIX D WIRING DIAGRAMS Fig G 551K 04 06 460 575 3 60 Unit with RTU Open Controller ...
Page 85: ...85 APPENDIX D WIRING DIAGRAMS Fig H 551K 04 06 Power Wiring Diagram 208 230 1 60 ...
Page 86: ...86 APPENDIX D WIRING DIAGRAMS Fig I 551K 04 06 Power Wiring Diagram 208 230 3 60 ...
Page 87: ...87 APPENDIX D WIRING DIAGRAMS Fig J 551K 04 06 Power Wiring Diagram 460 575 3 60 ...
Page 89: ......
