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6-3
Draining the Unit for Storage
6-4
Corrective Maintenance
Pumps and Seals
Page 50
You should thoroughly flush and drain the TDH-6 unit if you need
to take it out of service for a long time, or if you expect it to
become exposed to freezing temperatures. AEC, Inc. recommends
SterlFlush™ flushing fluid or equivalent for flushing your TDH-6
unit; follow unit flushing instructions that comes with SterlFlush™
flushing fluid.
Drain plugs are provided at the base of the heater tank, reservoir
tank, and on the pump. You should also remove, drain, and
reinstall the heat exchanger tube bundle before storage.
Each TDH-6 unit is completely tested and calibrated before
leaving the factory. The unit is then cooled, drained, and packed
for shipment.
If the unit stands idle for a long time before being installed in your
factory, gaskets can dry out and possibly leak when you start the
unit. In most cases, these gaskets soon swell and form a tight seal.
If not, you may need to tighten the bolts to stop the leak.
Similarly, rough handling in shipping may sometimes cause minor
leaks upon startup; you may need to re-tighten bolts or fittings
to stop the leak.
You should expect to periodically adjust the packing or replace the
pump seal. If the pump is properly lubricated and used at moderate
temperatures, the seal should last several years. The following
section describes the proper procedures for replacing the seal
Periodic replacement of the pump drive V-belt is also to be
expected.
Note: If the pump motor wiring is disconnected for removal from
the unit, you must check the actual direction of rotation
when the motor is rewired to the unit.
TDH-6 Series Hot Oil Large Temperature Control Units
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