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25
the inlet of the compressor. The compressor should then be run
for 10 minutes, shut down, and the access valve opened until
no oil flows. This should be repeated twice to make sure the
proper oil level has been achieved.
FAN SHAFT BEARINGS — For size 016 units, bearings are
permanently lubricated. No field lubrication is required. For
size 020-028 units, the bearings are of the pillow block type
and have grease fittings. The bearing opposite the motor end
has an extended tube line so it can be lubricated from the motor
side. Lubricate the bearings twice annually.
Typical lubricants are given below:
*Preferred lubricant because it contains rust and oxidation inhibitors.
CONDENSER AND EVAPORATOR-FAN MOTOR
BEARINGS — The condenser and evaporator-fan motors
have permanently-sealed bearings, so no field lubrication is
necessary.
Evaporator Fan Performance Adjustment
(Fig. 31-33) —
Fan motor pulleys are factory set for speed
shown in Table 1.
To change fan speeds:
1. Shut off unit power supply.
2. a. Size 016 Only: Loosen belt by loosening fan motor
mounting plate nuts.
b. Size 020-028 Only: Loosen nuts on the 2 carriage
bolts in the motor mounting base. Install jacking
bolt and plate under motor base (bolt and plate are
shipped in installer’s packet). See Fig. 33. Using
bolt and plate, raise motor to top of slide and
remove belt. Secure motor in this position by tight-
ening the nuts on the carriage bolts.
3. Loosen movable-pulley flange setscrew (see Fig. 31).
4. Screw movable flange toward fixed flange to increase
speed and away from fixed flange to decrease speed. In-
creasing fan speed increases load on motor. Do not ex-
ceed maximum speed specified in Table 1.
See Table 7 for air quantity limits.
5. Set movable flange at nearest keyway of pulley hub and
tighten setscrew. (See Table 1 for speed change for each
full turn of pulley flange.)
6. Replace and tighten belts. See Belt Tension Adjustment
section on page 26.
To align fan and motor pulleys:
1. Loosen fan pulley setscrews.
2. Slide fan pulley along fan shaft.
3. Make angular alignment by loosening motor from
mounting plate.
Evaporator Fan Service and Replacement
50TJ016 UNITS (See Fig. 32)
NOTE: To remove belts only, follow Steps 1-6.
1. Remove filter and supply-air section panels.
2. Remove unit top panel.
3. Loosen carriage nuts A and B holding motor mount as-
sembly to fan scroll side plates.
4. Loosen screw C.
5. Rotate motor mount assembly (with motor attached) as
far as possible away from evaporator coil.
6. Remove belt.
7. Rotate motor mount assembly back past original position
toward evaporator coil.
8. Remove motor mounting nuts D and E (both sides).
9. Lift motor up through top of unit.
10. Reverse above procedure to reinstall motor.
11. Check and adjust belt tension as necessary.
50TJ020-028 UNITS (See Fig. 33) — The 50TJ020-028
units use a fan motor mounting system that features a slide-out
motor mounting plate. To replace or service the motor, slide out
the bracket.
1. Remove the evaporator-fan access panel and the heating
control access panel.
2. Remove the center post (located between the evaporator
fan and heating control access panels) and all screws se-
curing it.
3. Loosen nuts on the two carriage bolts in the motor mount-
ing base.
4. Using jacking bolt under motor base, raise motor to top of
slide and remove belt. Secure motor in this position by
tightening the nuts on the carriage bolts.
5. Remove the belt drive.
6. Remove jacking bolt and tapped jacking bolt plate.
7. Remove the 2 screws that secure the motor mounting
plate to the motor support channel.
8. Remove the 3 screws from the end of the motor support
channel that interfere with the motor slide path.
9. Slide out the motor and motor mounting plate.
10. Disconnect wiring connections and remove the 4 mount-
ing bolts.
11. Remove the motor.
12. To install the new motor, reverse Steps 1-11.
MANUFACTURER LUBRICANT
Texaco
Regal AFB-2*
Mobil
Mobilplex EP No. 1
Sunoco
Prestige 42
Texaco
Multifak 2
Fig. 31 — Evaporator-Fan Pulley Alignment
and Adjustment