27
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.
NOTE: Field-supplied motors with removable lubrication plug
should be lubricated every 6 months.
Evaporator Fan Performance Adjustment
(Fig. 37-39) —
Fan motor pulleys are factory set for speed
shown in Tables 1A and 1B.
To change fan speeds:
1. Shut off unit power supply.
2. a Size 016 Only: Loosen belt by loosening fan motor
mounting plate nuts (see Fig. 38).
b.
Size 024,028 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. 39. Using
bolt and plate, raise motor to top of slide and
remove belt. Secure motor in this position by
tightening the nuts on the carriage bolts.
3. Loosen movable-pulley flange setscrew (see Fig. 37).
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 Tables 1A and 1B. See
Table 8 for air quantity limits.
5. Set movable flange at nearest keyway of pulley hub and
tighten setscrew. (See Tables 1A and 1B for speed change
for each full turn of pulley flange.)
6. Replace and tighten belts. See Belt Tension Adjustment
section on page 28.
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. 38)
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.
MANUFACTURER
LUBRICANT
Texaco
Regal AFB-2*
Mobil
Mobilplex EP No. 1
Sunoco
Prestige 42
Texaco
Multifak 2
Fig. 37 — Evaporator-Fan Pulley Alignment
and Adjustment
Fig. 38 — 50TJ016 Evaporator-Fan
Motor Section
Содержание 50TJ016-028
Страница 32: ...32 Refer to Fig 44 for typical unit wiring schematic Fig 44 Typical Wiring Schematic 50TJ024 400 V Shown ...
Страница 37: ......
Страница 39: ......