Carrier 48TFE008-014 - Manual (Page 37)

37
Lubrication
COMPRESSORS — Each compressor is charged with the
correct amount of oil at the factory.
FAN-MOTOR BEARINGS — Fan-motor bearings are of
the permanently lubricated type. No further lubrication is re-
quired. No lubrication of condenser- or evaporator-fan motors
is required.
Condenser-Fan Adjustment (Fig. 48)
1. Shut off unit power supply and tag disconnect.
2. Remove condenser-fan assembly (grille, motor, motor
cover, and fan) and loosen fan hub setscrews.
3. Adjust fan height as shown in Fig. 48.
4. Tighten setscrews and replace condenser-fan assembly.
Manual Outdoor-Air Damper — If outdoor-air damp-
er blade is required, see Manual Outdoor-Air Damper section on
page 12.
Economizer Adjustment — Refer to Optional Dura-
blade Economizer section on page 14.
Condenser Coil Grille — Condenser coil grille is
shipped factory-installed. No adjustments are required.
Refrigerant Charge — Amount of refrigerant charge is
listed on unit nameplate (also refer to Tables 1A and 1B). Refer
to Carrier GTAC 2-5 Charging, Recovery, recycling, and recla-
mation training manual and the following procedures.
Unit panels must be in place when unit is operating during
charging procedure.
NO CHARGE — Use standard evacuating techniques. After
evacuating system, weigh in the specified amount of refriger-
ant (refer to Tables 1A and 1B).
LOW CHARGE COOLING — Using the Cooling Charging
Charts, Fig. 49-51 vary refrigerant until the conditions of the
appropriate chart are met. Note the charging charts are differ-
ent from the type normally used. The charts are based on
charging the units to the correct superheat for the various oper-
ating conditions. Accurate pressure gage and temperature sens-
ing device are required. Connect the pressure gage to the
service port on the suction line. Mount the temperature sensing
device on the suction line and insulate it so that outdoor ambi-
ent temperature does not affect the reading. Indoor-air cfm
must be within the normal operating range of the unit.
TO USE COOLING CHARGING CHARTS — Take the out-
door ambient temperature and read the suction pressure gage.
Refer to appropriate chart to determine what suction tempera-
ture should be. If suction temperature is high, add refrigerant.
If suction temperature is low, carefully reclaim some of the
charge. Recheck the suction pressure as charge is adjusted.
Example (Fig. 51, Circuit 1):
Outdoor Temperature. . . . . . . . . . . . . . . . . . . . . . . . .13 C (55 F)
Suction Pressure. . . . . . . . . . . . . . . . . . . . . . . .483 kPa (70 psig)
Suction Temperature should be. . . . . . . . . . . . . . . . .23 C (74 F)
(Suction temperature may vary ± 3 C [5 F].)
Fig. 45 — Cleaning Condenser Coil
Fig. 46 — Propping Up Top Panel
Fig. 47 — Separating Coil Sections
Fig. 48 — Condenser-Fan Adjustment
48TF UNIT VOLTAGE FAN HEIGHT “A” (in.)
400 V 89 (3.50)