AEC TCU Series Open Reservoir Water Temperature Control Units - Manual (Page 40)

Open Resevoir Water Temperature Control Units Page 41
Periodic Checks
Every Six Months
Inspect all electrical connections for secure attachment and for safe
and secure ground connections. Inspect the power cable, especially
at the entrance point to the unit. Also inspect the heater contactors
for loose wire connections and unusual wear or debris, as this may
be a sign of premature failure. This inspection should be made by
a qualified electrician. Check for leaks, especially under the pump,
as it may indicate a worn pump seal.
6-2 Corrective Maintenance
Pumps and Seals
Before leaving our factory, we test each unit extensively, then we
calibrate each unit. Afterwards, the unit is drained and blown out
with air to remove water from piping systems. If the unit is
allowed to stand idle for a long time before being installed in your
factory, the housing gasket at the pump can dry out and can
possibly leak when the unit is started. In most cases these gaskets
will soon swell and form a tight seal. In other cases, it may be
necessary for you to tighten the pump bolts to stop a leaking
condition.
Pump seal surfaces can separate slightly because of rough handling
or from vibration during transit. This could cause a leak at the
pump seal when the pump is started, but in most cases the surfaces
will mate again after the pump is allowed to run for a short period
of time. If they do not reseal, you may need to open the pump and
free the seal by hand. It is seldom necessary to install a
replacement seal in a new unit unless the seal has been damaged
because the unit was started without water.
Our pump seals have a long period of service life. Some
conditions, of course, can shorten seal life, including the presence
of grit, operation of the unit without water, sustained high water
temperature, or presence of certain chemicals in the water. Our
pump seal assembly has been developed to resist abrasive particles
that are present in many water systems. This is done by a special
flushing system that uses water exiting the pump to constantly
wash the seal area.