Sterlco Royal Series Compact Temperature Control Unit - Manual (Page 40)

Page 40 Royal Series Water Temperature Control Units
It is also fitted with high temperature flexible components for
maximum heat resistance. These same components remain flexible
even at low temperatures. Thus, the standard seal is a fine
combination of heat resistant and wear resistant components.
Unfortunately, even under normal use, the seal will eventually
wear and require replacement.
A small puddle underneath the unit is a sign of rotary seal wear,
and if investigation confirms the pump as the source, the seal
should be replaced as soon as practical. The water slinger is
intended to provide temporary protection against this, but a
continued and substantial leak will ruin the motor bearing and
cause further damage.
After the unit has been in service for a period of years where
abrasive conditions are present, you may find that the pump
bracket (the top half of the pump casting), can be eroded away in
the area around the seat of the rotary seal. This area should provide
a straight, smooth bearing surface for the cup seal. Should your
casting show signs of erosion in this area, the casting needs to be
replaced. The replacement cost of the casting is very modest
compared to the down time and maintenance cost for frequently
replacing the seal.
Under some conditions, the pump may not start. After turning off
the power supply, check the motor shaft to be certain it is free to
turn. By removing the drip cover on top of the motor, you’ll have
access to the end of the shaft. It has been slotted to make it easy to
turn with a screwdriver. If the shaft is free to turn, next check that
the motor overloads are set, check for blown fuses, and finally
check the power supply on each leg to the motor. A qualified
electrician should check the motor and its circuit.
Important!
If the pump motor wiring is disconnected for removal from the unit,
make sure that you check the actual rotation direction
when the motor is rewired to the unit.
A phase sensor does not always indicate proper rotation
if motor wire leads are reversed at installation.
Consult the elementary wiring diagram for more information.