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START-UP PROCEDURE
Blower Adjustments
If blower fan speed changes are required, adjust motor sheave
as follows:
1. Refer to pages 39-41 to determine correct blower speed
according to job requirements, then proceed with steps 2
through 8.
2. Loosen motor base and take belt off of motor sheave.
3. Loosen set screw on outer side of adjustable motor sheave.
Figure 20.1 - Motor Sheave Adjustment
MOTOR
SHAFT
4. Turn outer side of motor sheave clockwise until motor
sheave is fully closed.
5. From fully closed position, turn outer side of motor sheave
counterclockwise until the proper number of turns open are
achieved.
6. Retighten motor sheave set screw, replace belt and retighten
motor base. Motor base should be shifted for proper belt
tension which is 3/4" deflection with about 5 lbs. of force.
Figure 23.2 - Belt Tension Adjustment
7. Recheck blower rpm after adjustment.
NOTE: Do not fire unit until blower adjustment has been
made or unit may cycle on high limit control.
8. Check motor amps. Do not exceed nameplate amps shown
on motor nameplate.
SET SCREW
ADJUSTABLE HALF
OF SHEAVE
3/4" deflection
with 5 lbs. of force
Lubrication Recommendations
The blower can be provided with either spider or pillow block
bearings. Spider bearings are permanently lubricated and do not
require lubrication. Pillow block bearings are shipped greased
from the factory but will require lubrication. The bearings should
be checked and lubricated before each heating season but a
more frequent lubrication schedule may be required based on
the environment in which the unit is installed, and the frequency
of the equipment operation. Shell Alvania #2 lubricant is
recommended.
Damper Linkage Adjustment
If the unit is provided with a return air damper, to prevent
shipping damage, the return air damper linkage is disconnected
and the damper closed. Before operating the unit, the fresh and
return air dampers must be connected. This is accomplished by
the following:
1. The damper actuator should be de-energized and the fresh
air damper in a fully closed position.
2. Open the return air damper in a fully open position.
3. Slide the connecting rod into the ball joint on the blade arm
with the return air damper fully open. See Figure 23.3.
4. Tighten the 5/16" hex head screw on the ball joint.
Figure 23.3 - Damper Linkage Adjustment
BALL JOINT
5-594.10
CONNECTING ROD
BLADE ARM
DAMPER
BLADE
23
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