Spencer Single-Stage Scroll Blowers - Manual (Page 5)

caused by operating in surge is not covered by
Spencer warranty.
A blower In surge produces a rush or pulsating
rhythmic air sound caused when airflow into or out of
the blower is restricted. In addition to its
characteristic noise, surge may be detected by
power or pressure fluctuations. Surge is destructive
because it is accompanied by excessive
temperatures and aerodynamic forces that will
ultimately cause mechanical failure. A surge
condition is simply eliminated by increasing the
airflow either into the system or to a bypass or vent.
NOTE: If a blower surges violently at startup, avoid
recurrences by leaving the throttling valve open at or
near its normal operating position.
II. Operation and
Adjustments
Startup Precautions
Before operating a new blower for the first lime,
review its installation and setup to be sure that no
steps have been overlooked.
1. Installation Check List
• Is there any damage from transportation or
installation?
• Is the machine level?
• Have all packing, shipping materials and tools
been removed?
• Is the inlet filter in place?
• Are isolation pads in place?
• Is the piping connected and supported?
• Are flexible connectors in place between blower
and piping?
• Are safety guards in place?
2. Adjustment Checks
• Is the coupling aligned within tolerances and
lubricated?
3. Operational Checks
• Is the throttling valve closed or properly
positioned?
• Do the blower shaft and driver spin freely?
• Is the isolation valve (if any) open?
• Is the system ready for air or gas delivery?
• Has motor rotation been checked?
• Are motor and electrical accessories properly
wired?
5
Coupling Alignment with Sleeve Bearing Motors
Caution: Complete the following procedures
before attempting coupling alignment with sleeve
bearing motors.
Use a flange-type gear coupling for both 1800 and
2600 RPM motors. Do not use a sleeve-type
coupling.
Sleeve bearing motors have a specified end play.
End play limits and the magnetic center (where
motor will run) should be scribed on the shaft by the
manufacturer.
Use the following procedure to align a sleeve bearing
motor with a blower.
1. Make sure the motor shaft is level.
2. Position the motor so that when the rotor is
pushed toward the blower as far as it will go, there
will 0.030" clearance between the ends of the
motor and blower shafts (or the alignment faces
on the coupling hubs).
3. Proceed with coupling alignment using the
appropriate instructions.
Alignment Tips
• Make sure the blower is level before alignment.
• Mark the axial location of the motor before
alignment as a reference point to be sure it does
not move.
• Avoid disturbing any factory-installed shims unless
they are to be replaced.
• Do soft foot corrections first; loosen all mounting
bolts before correcting any foot.
• During the final vertical adjustment of the motor,
work on one side at a time, loosening the jack
bolts first so the motor does not move laterally as
mounting bolts are loosened.
• Use the smallest shim that will slide over the
mounting bolts.
• Minimize the number of shims. One thick shim
and 2-3 thin shims are usually satisfactory.
• Remove all traces of dirt or contaminants from
shims and machine parts.
• Use stainless steel shims only.
• Never reuse shims.
Caution: After each alignment check, add
coupling lubricant If required.
WARNING: REPLACE THE COUPLING GUARD
BEFORE RESTARTING THE BLOWER.
Surge
Caution: Do not operate blower In surge
(unstable low flow range). Damage to blower
The Spencer Turbine Company ◆ 600 Day Hill Road, Windsor, CT 06095 ◆ TEL 800-232-4321 ◆ 860-688-8361 ◆ www.spencerturbine.com