Carrier SINGLE PACKAGE ROOFTOP UNITS ELECTRIC COOLING/GAS HEATING 48HJ015-025 - Manual (Page 19)

FAN SHAFT BEARINGS — For 015 units, the bearings are
permanently lubricated. No field lubrication is required. For
017 and 025 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:
MANUFACTURER LUBRICANT
Texaco Regal AFB-2*
Mobil Mobilplex EP No. 1
Sunoco Prestige 42
Texaco Multifak 2
*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, 48HJ015 Units
PERFORMANCE ADJUSTMENT — The 48HJ015 fan mo-
tor pulleys are factory set for speed shown in Table 1.
To change fan speeds:
1. Shut off unit power supply.
2. Loosen belt by loosening fan motor mounting plate nuts.
3. Loosen movable-pulley flange setscrew (see Fig. 28).
4. Screw movable flange toward fixed flange to increase speed
and away from fixed flange to decrease speed. Increasing
fan speed increases load on motor. Do not exceed maxi-
mum speed specified in Table 1.
5. Set movable flange at nearest keyway of pulley hub and
tighten setscrew.
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 mount-
ing plate.
SERVICE AND REPLACEMENT (See Fig. 29)
NOTE: To remove belts only, follow Steps 1-7.
1. Remove filter and supply-air section panels.
2. Remove unit top cover.
3. Remove coil guard.
4. Loosen screws A and B on both sides of motor mount
assembly.
5. Loosen screw C.
6. Rotate motor mount assembly (with motor attached) as
far as possible away from evaporator coil.
7. Remove belt.
8. Rotate motor mount assembly back past original posi-
tion toward evaporator coil.
9. Remove motor mounting nuts D and E (both sides).
10. Lift motor up through top of unit.
11. Reverse above procedure to reinstall motor.
12. Check and adjust belt tension as necessary.
Evaporator Fan, 48HJ017,025 Units
PERFORMANCE ADJUSTMENT — Fan motor pulleys are
factory set for speed shown in Table 1.
To change fan speeds:
1. Shut off unit power supply.
2. Loosen nuts on the 2 carriage bolts in the mounting base.
Install jacking bolt and plate under motor base (bolt and
plate are shipped in installer’s packet). Using bolt and
plate, raise motor to top of slide and remove belt. Secure
motor in this position by tightening the nuts on the car-
riage bolts.
3. Loosen movable-pulley flange setscrew (see Fig. 28).
Fig. 28 — Evaporator-Fan Alignment and
Adjustment
Fig. 29 — 48HJ015 Evaporator-Fan
Motor Adjustment
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