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Year of Production
Fig. 4 Typical Nameplate
III. Operation
Limits of Operation
Operation at flows less than those indicated by the
solid line on the applicable performance curve will cause
overheating of the unit and is to be avoided.
Maximum pressure and vacuum are indicated on the
nameplate (see Fig. 4). These represent conditions at
which the minimum allowable airflow (CFM) occurs.
Check the operating pressure or vacuum to assure that
the pressure or vacuum remains less than maximum.
For continuous operation at low air volume (on the
dotted portion of the performance curve), provide a
bypass in the piping and operate at a lower pressure
than maximum operating pressure. See Performance
Curves, Section V.
Caution: Low flow conditions may produce heat levels
which may cause burns. Do not touch the blower in
operation.
Temperature Rise
A NEMA Class F insulation system is used in the motor.
Maximum allowable winding temperature is 265˚F. If a
thermal protector or thermal relay activates because the
temperature rise of the motor is higher than usual, inves-
tigate and correct the problem. Explosion-proof motors
use a NEMA Class B insulation. Typical causes of motor
overheating are given in Section VI, Troubleshooting
Guide.
The Spencer Turbine Company 600 Day Hill Road, Windsor, CT 06095-4706 TEL 800-232-4321
IV. Disassembly and
Reassembly
A. General
1. Precautions should be taken when disassembling
or reassembling the blower. See Warranty Terms.
2. Keep all parts clean.
3. Do not overtighten bolts and screws.
MOTOR
"C" FACE
Fig. 5 Impeller Puller
B. Disassembly Procedure (Reassembly is performed
in reverse order)
Caution: Shims are used to adjust the gap between
the impeller and casing. When disassembling,
take care to note the quantity of shims and their
thickness. The shim stack replacement must be
the correct thickness to assure proper clearance
and to avoid degradation of performance.
1. Remove impeller cover; remove screws, pull cover
away from case.
2. Unfasten lock washer; remove nut and washer.
3. Remove impeller from shaft by one of the following
methods:
a. manually
pull
the
b. screw two bolts into tapped holes and pull on
the bolts, OR (if the fit is tight)
c. use a puller assembly (not furnished) as shown in
Fig. 5.
4. Remove motor shaft key.
5. Remove case from motor; if necessary remove
screws holding case to base and motor to case.
6. Remove shims from motor shaft if necessary; do
not discard them. See Note above.
Caution: Motors are heavy. Lift motor on models
larger than VB002 by the eyebolt on the motor with
an aid from a lifting device.
C. Reassembly Guidance
1. The gap between the impeller and case is essential for
proper performance of the unit. The shims between
the shaft collar and impeller hub establish the spacing
of this gap. In reassembly, before installing the
impeller cover, check the gap between the impeller
and case to assure that the measurement conforms to
the gap specification on the assembly drawing (on the
following pages) for your unit.
IMPELLER
HUB
SHAFT
THREADED
PLATE
BOLT
SHIM BLOCK
impeller
outward,
860-688-8361
FAX 860-688-0098
OR
5
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