Carrier 48HC D17 Series Service And Maintenance Instructions page 27

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 a liquid line. A liquid- - line filter drier is
designed for use with Puron (R- - 410A) refrigerant and is
required on every unit.
Replacing the Filter Drier
Use the following steps to replace the Filter Drier.
1. Using Puron (R410) gauge set, recover all refrigerant
from system.
2. Use tubing cutter to remove filter drier from line.
NOTE: Do Not use a torch to remove old filter drier. The
heat from the torch will allow contaminants into the air
and into the open refrigeration system.
3. Sweat a new replacement filter drier into refrigerant
line.
4. Re- - charge refrigerant system.
Adjusting the Condenser- -Fan
1. Shut off unit power supply. Apply appropriate Lock-
out/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. 33.
5. Tighten setscrews to 84 in-lbs (9.5 Nm).
6. Replace condenser-fan assembly.
Fig. 33 - - Condenser Fan Adjustment
TROUBLESHOOTING COOLING SYSTEM
Troubleshooting Cooling System
Refer to Table 3 for Troubleshooting Cooling System
topics.
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