Carrier 50EJQ Installation, Start-Up And Service Instructions Manual page 30

Fig. 38 — Indoor-Fan Alignment and Adjustment
6. Remove shaft.
7. Remove venturi on opposite side of bearing.
8. Lift out wheel.
9. Reverse above procedure to reinstall fan.
10. Check and adjust belt tension as necessary.
Belt Tension Adjustment —
1. Remove power to unit.
2. Remove motor mount nuts and bolts.
3. Loosen fan motor nuts. See Fig. 39.
4. Turn motor jacking bolts to move motor mounting plate
left or right for proper belt tension. A slight bow should
be present in the belt on the slack side of the drive while
running under full load.
5. Tighten nuts.
6. Adjust bolts and nut on mounting plate to secure motor
in fixed position. Recheck belt tension after 24 hours of
operation. Adjust as necessary.
Outdoor-Fan Adjustment
1. Shut off unit power supply.
2. Remove fan guard.
3. Loosen fan hub setscrews.
4. Adjust fan height on shaft using a straightedge placed across
venturi and measure per Fig. 40.
5. Tighten setscrews and replace fan guard.
6. Turn on unit power.
Indoor-Fan Motor Replacement
1. Shut off unit power supply.
2. Remove upper outside panel and open hinged door to
gain access to motor.
3. Fully retract motor plate adjusting bolts.
To adjust belt tension:
30
Fig. 39 — Belt Tension Adjustment
Fig. 40 — Outdoor-Fan Adjustment
4. Loosen the 2 rear (nearest the indoor coil) motor plate
nuts.
5. Remove the 2 front motor plate nuts and carriage bolts.
6. Slide motor plate to the rear (toward the coil) and re-
move fan belt(s).
7. Slide motor plate to the front and hand tighten one of
the rear motor plate nuts (tight enough to prevent the
motor plate from sliding back but loose enough to allow
the plate to pivot upward).
8. Pivot the front of the motor plate upward enough to
allow access to the motor mounting hex bolts and
secure in place by inserting a prop.
9. Remove the nuts from the motor mounting hex bolts and
remove motor.
10. Reverse above steps to install new motor.
Power Failure —
Dampers have a spring return. In event
of power failure, dampers will return to fully closed position
until power is restored.
Refrigerant Charge —
is listed on unit nameplate and in Table 1. Refer to Carrier
GTAC II; Module 5; Charging, Recovery, Recycling, and
Reclamation section for charging methods and procedures.
Unit panels must be in place when unit is operating dur-
ing charging procedure.
Amount of refrigerant charge