36
Lubrication
COMPRESSORS — Each compressor is charged with 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.
Evaporator Fan Belt Inspection —
Check condi-
tion of evaporator belt or tension during heating and cooling
inspections or as conditions require. Replace belt or adjust as
necessary. Refer to Step 7 — Adjust Evaporator-Fan Speed on
page 20 for proper adjustment procedures and belt tension.
Condenser-Fan Adjustment (Fig. 49)
1. Shut off unit power supply, 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. 49.
4. Tighten setscrews.
5. Replace condenser-fan assembly.
Manual Outdoor-Air Damper —
If outdoor-air damp-
er blade adjustment is required, see Manual Outdoor-Air
Damper section on page 11.
Economizer Adjustment —
Refer to Optional Econo-
mizer sections on pages 12 and 15.
Condenser Coil Grille —
Condenser coil grille is shipped
factory-installed. No adjustments are required.
Refrigerant Charge
CHECKING AND ADJUSTING REFRIGERANT CHARGE —
The refrigerant system is fully charged with R-22 refrigerant,
tested, and factory-sealed. Unit must operate in Cooling mode
a minimum of 10 minutes before checking charge.
NOTE: Adjustment of the refrigerant charge is not required
unless the unit is suspected of not having the proper R-22
charge.
A superheat charging chart is attached to the outside of the
service access panel. The chart includes the required suction
line temperature at given suction line pressures and outdoor
ambient temperatures.
An accurate superheat, thermocouple- or thermistor-type
thermometer, and a gage manifold are required when using the
superheat charging method for evaluating the unit charge. Do
not use mercury or small dial-type thermometers because they
are not adequate for this type of measurement.
Proceed as follows:
1. Remove caps from low- and high-pressure service
fittings.
When evaluating the refrigerant charge, an indicated
adjustment to the specified factory charge must always be
very minimal. If a substantial adjustment is indicated, an
abnormal condition exists somewhere in the cooling sys-
tem, such as insufficient airflow across either coil or both
coils.
Fig. 46 — Cleaning Condenser Coil
Fig. 47 — Propping Up Top Panel
Fig. 48 — Separating Coil Sections
Fig. 49 — Condenser Fan Adjustment
50TFF
FAN HEIGHT
‘‘A’’, in.
208/230 V
2.75
460 and 575 V
3.50
Summary of Contents for 50TFF008-014
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