Carrier Essential Maintenance Guidelines for Heating Systems: Using Mobilplex 48 Grease

FAN SHAFT BEARINGS Ð For 015 units, the bearings are permanently lubricated. No ®eld lubrication is required. For 017 and 025 units, the bearings are of the pillow block type and have grease ®ttings. 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 Ð The condenser- and evaporator-fan motors have permanently-sealed bearings, so no ®eld lubrication is necessary.

Evaporator Fan, 48HJ015 Units

PERFORMANCE ADJUSTMENT Ð 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 ¯ange setscrew (see Fig. 28).

4.Screw movable ¯ange toward ®xed ¯ange to increase speed and away from ®xed ¯ange to decrease speed. Increasing fan speed increases load on motor. Do not exceed maxi- mum speed speci®ed in Table 1.

5.Set movable ¯ange 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 ®lter 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 Ð 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 ¯ange setscrew (see Fig. 28).

Fig. 28 Ð Evaporator-Fan Alignment and

Adjustment

Fig. 29 Ð 48HJ015 Evaporator-Fan

Motor Adjustment

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