15
4. Screw movable flange toward fixed flange to increase fan
speed and away from fixed flange to decrease speed. Increas
-
ing fan speed increases load on motor. Do not exceed maxi
-
mum allowable fan speed or motor full load amps indicated
on motor nameplate and in Table 4.
5. Set movable flange setscrew at nearest flat of pulley hub and
tighten setscrew.
6. Check pulley alignment and belt tension adjustment as
described below.
7. Check fan operation. Repeat above procedure as required.
Pulley Alignment
Shut off unit power supply. Lock out power supply and tag discon
-
nect locations. Loosen fan motor pulley setscrews and slide fan
pulley along fan shaft. Make angular alignment by loosening mo
-
tor from mounting bracket (see Fig. 7). Check alignment with a
straightedge.
Fig. 7 —
Fan Pulley Adjustments
Belt Tension Adjustment
Shut off unit power supply. Lock out power supply and tag discon
-
nect locations. Loosen fan motor mounting plate bolts. Do not
loosen motor mounting bracket from unit. Move fan motor
mounting plate until proper belt tension is achieved (approximate
-
ly
1
/
2
-in. deflection with 8-lb tension at midpoint of belt span).
Changing Fan Wheel
If a fan wheel should fail, it may be replaced as follows:
1. Shut off unit power supply. Lock out power supply and tag
disconnect locations.
2. Remove belts from fan pulley.
3. Loosen locking collars on the fan bearings and set screws on
the fan wheels.
4. Remove the shaft through the access panel on either side of
the unit.
5. Remove the fan cut-off plate in the fan discharge.
6. Remove the fan wheel through the fan discharge opening.
7. Replace the wheel, and reverse Steps 1-5 above.
Fan Bearing Replacement
If a fan bearing fails, replace it as follows:
1. Shut off unit power supply. Lock out power supply and tag
disconnect locations.
2. Remove belts from the fan pulley.
3. Support fan shaft.
4. Loosen locking collar on fan bearing.
5. Remove bearing from the shaft.
6. Install new bearing onto the shaft, and reverse Steps 1-4
above.
Concentric Alignment
Shaft and wheels must be concentrically centered with the venturi
or air inlet of the fan housing (see Fig. 8).
Shaft bearings are supported by bearing supports (Fig. 9). If shaft
and wheels are concentrically misaligned from shipping shock, re
-
place the bearing support if it has extensive damage.
Fig. 8 —
Concentric Alignment
Fig. 9 —
Fan Shaft Bearings
Condenser Motor Starter Setting (after Lockout/
Tagout)
Motor starter is factory set. If starter is replaced in the field, use the
following procedure to set:
1. On the starter, adjust the Motor Overload to match the
FLA
Rating
of the installed motor by turning the Overload Set
-
point wheel to the appropriate value. See Fig. 10. Condenser
motor FLA ratings are listed in Table 12.
2. On the starter, turn the Motor Overload Reset wheel to
M-O
(referred to as Manual Reset).
3. On the starter, depress the Motor Overload Reset wheel (the
wheel also acts as reset button).
4. Turn the Power Switch/Disconnect Switch of the Start/Stop
Station to the
ON
Position.
