Advantage OACS Series, Instruction Manual, Page: 56 / 86

OACS Central Chillers : with MG Series Control Instrument
Page: 56
ADVANTAGE ENGINEERING, INC.
525 East Stop 18 Road Greenwood, Indiana 46142
317-887-0729 Fax: 317-881-1277
Service Department Fax: 317-885-8683
Email: service@AdvantageEngineering.com
5.5 PUMP SEAL SERVICE
A. The coolant pump seal is a carbon/niresist
shaft seal assembly including a stationary
member, rotating member and tension spring
(figure 5.5A).
B. The operator can determine the pump seal is
leaking when fluid is identified leaking from
the pump case adapter. Generally, a pump
seal will leak due to inadequate unit pressure,
excessive flow and poor fluid quality.
C. The operator should follow this procedure to replace
the pump seal:
1. Disengage process operations according
to the procedure outlined in section 3.4.
The operator must be certain process fluid
temperature is under 100°F and pressure is
relieved (COOLANT pressure gauge reads
“0”) and water make-up flow is shut off and
all pressure relieved.
2. Disengage main power supply. The operator
must verify the proper lockout procedures
are followed.
3. Access the pump motor by opening or
removing any cover panels as necessary
(figure 5.5B).
4. Drain machine. The machine can be
drained by using the drain valve located on
the pump case. Drain fluid into a suitable
container for reuse or disposal according
to manufacturer’s instructions (if a glycol
solution is used).
5. Locate and 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 5.5C).
6. Locate and remove the pump casing bolts.
These bolts secure the motor and motor
adapter to the pump casing (figure 5.5D).
Stationary member
Rotating Member Tension Spring
Figure 5.5A
Pump motor Figure 5.5B
Pump motor Figure 5.5C
Typical pump casing
bolt
Figure 5.5D