AEC Econo-Cool Chillers - Manual (Page 45)

Page 44 AEC Water Temperature Control Units
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. 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.