Technical information

5.5 PUMP SEAL SERVICE
A. The VLA unit 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 water
make-up flow is shut off and all pressure relieved.
2. Disengage main power supply. The operator must verify the
POWER light on the display is “off”.
3. Access the pump motor by
opening or removing any
cover panels as necessary
(figure 5.5B).
4. Drain machine. 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).
Page: 36
VL Series Portable Chillers, 2 to 40 Tons UGH021/0301
Stationary member
Rotating Member
Tension Spring
Figure 5.5A
Pump motor
Figure 5.5B
Pump motor power cord
Figure 5.5C