Advantage Sentra SK Series, Instruction Manual

Page: 38 / 70

Temperature Control Units : Sentra with VE Series Instrument
Page: 38
Advantage Engineering, Inc.
525 East Stop 18 Road Greenwood, Indiana 46142
317-887-0729 Fax: 317-881-1277
Service Department Fax: 317-885-8683
www.AdvantageEngineering.com
5.1 PUMP SEAL REPLACEMENT
A. The pump seal is a carbon/ceramic shaft
seal assembly including a stationary
member, rotating member and tension
spring (figure 5.1A).
B. The life cycle of the pump seal is determined
by hours of use, operating temperature
and water quality. Poor water quality is the
primary reason for premature pump seal
failure.
C. The operator should follow this procedure to
replace the pump seal:
1. Disengage process operations and
relieve all system pressure.
2. Disengage main power supply. Verify
the Power light on the display is “off”.
3. Remove the lift-off access panel and
set aside.
4. Remove the thermoformed panel. It is
attached to the stainless steel cabinet
by 4 small screws (figure 5.1B).
5. Drain machine by removing the pump
casing drain plug.
6. Remove the three motor wire leads
from the motor wiring terminals. The
operator should “map” the wire terminal
locations to ensure correct rewiring. The
power cord should be removed from the
motor housing (figure 5.1C).
7. Locate and remove the 4 pump casing
bolts. These bolts secure the motor
and motor adapter to the pump casing
(figure 5.1D).
8. Separate the motor and adapter from
the pump casing to expose the pump
impeller (figure 5.1E). Remove the
motor and adapter from the unit and
place on a workbench to continue the
procedure.
Stationary member
Rotating Member
Tension Spring
Figure 5.1A
Thermoformed panel
removed and electrical
cabinet open.
Figure 5.1B
Motor leads
Figure 5.1C
Pump casing bolts
Figure 5.1D