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17
Compressors
LUBRICATION
Compressors are charged with the correct amount of oil at the
factory.
REPLACING COMPRESSOR
NOTE: Only factory-trained service technicians should remove
and replace compressor units.
Compressors using Puron refrigerant contain a polyolester (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
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 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 three unit power leads.
7. Reapply electrical power to the compressor.
8. The suction pressure should drop and the discharge pres
-
sure should rise which is normal for scroll compressors on
start-up.
9. Replace compressor if suction/discharge pressures are not
within specifications for the specific compressor.
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).
OUTDOOR FAN LOCATION
See Fig. 25.
1. Shut off unit power supply. Apply lockout/tag-out
procedures.
2. Remove condenser-fan assembly (grille, motor, and fan).
3. Loosen fan hub setscrews.
4. Adjust fan height as shown in Fig. 25.
5. Tighten setscrews to 84 in.-lb (9.5 Nm).
6. Replace condenser-fan assembly.
Fig. 25 —
Outdoor Fan Adjustment
Troubleshooting Cooling System
Refer to Table 5 for additional troubleshooting topics.
CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution may result in damage to
components.
The compressor is in a R-410A 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
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.
CAUTION
INSTALLATION SITE DAMAGE
Failure to follow this caution can result in damage to equip
-
ment location site.
R-410A refrigerant contains polyolester (POE) oil that can
damage the roof membrane. Caution should be taken to pre
-
vent 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 re
-
move 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.
CAUTION
EQUIPMENT DAMAGE
Failure to follow this caution can result in equipment damage.
Do not install a suction-line filter drier in liquid line. A liquid-
line filter drier designed for use with R-410A refrigerant is re
-
quired on every unit.
CONDUIT
0.14 in. + 0.0 / -0.03
Summary of Contents for WeatherMaker 50TCQ 17-24 Series
Page 35: ...35 Fig 53 RTU Open Overlay for Economizer Wiring ...
Page 36: ...36 Fig 54 VFD Overlay for W2770 Controller Wiring ...
Page 68: ...68 Fig B 50TCQD17 24 Control Wiring Diagram APPENDIX D WIRING DIAGRAMS ...
Page 69: ...69 Fig C 50TCQD17 24 Power Wiring Diagram 208 230 3 60 Units APPENDIX D WIRING DIAGRAMS ...
Page 70: ...70 Fig D 50TCQD17 24 Power Wiring Diagram 460 3 60 575 3 60 Units APPENDIX D WIRING DIAGRAMS ...
Page 71: ...71 Fig E RTU Open Overlay APPENDIX D WIRING DIAGRAMS ...
Page 72: ...72 Fig F PremierLink Overlay APPENDIX D WIRING DIAGRAMS ...