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17
Compresso r Rotation
PERSONAL INJURY HAZARD
Failure to follow this caution may result in personal
injury.
CAUTION
!
On 3--phase units with scroll compressors, it is important
to be certain com pressor is rotating in the proper
direction. To dete rmine whether or not compressor is
rotating in the proper direction:
1. Connect servi ce gauge s t o 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 t he evaporator fan is probably a lso rotating
in the wrong direction.
5. Turn off power t o the unit.
6. Reverse any two of the unit power leads.
7. Reapply power to the compressor.
The suc tion 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.
Outdoor Fan Location
See Fig. 21.
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. 21.
5. Tighten setscrews to 84 in--lbs (9.5 Nm).
6. Replace condenser--fan assembly.
Conduit
0.14 in + 0.0 / -0.03
C08448
Fig. 21 -- Outdoor Fan Adjustment
Troubleshooting Cooling System
Refer to Table 6 for additional troubleshooting topics.
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