(3) Rotate the shaft by hand to check its smooth rotation. Remove a shaft coupling guard, grip a
coupling and turn its shaft. The rotation must be smooth without binding.
(4) For positive suction pressure, open the sluice valve on both sides of the pump and prime the
pump. At that time, loosen the air vent cock to release air from the pump. While rotating the shaft
by hand, release the air until no air bubble is seen. The air might be left inside the impeller. When
water spouts out, the priming is complete. For negative suction pressure, prime the pump via the
priming pipe.
Warning
When priming the pump (air venting), prevent the damage of the motor and parts
from the spouting water. When you pump hot water, be careful not to get burns.
Warning
For pumps circulating heated water, do not carry out the above procedure with
bare hands because hot water may spout out of the air vent cock, thus leading to
burns.
Caution
Never run the pump dry (operation without priming). Failure to observe this may
cause the sliding parts inside the pump to seize up.
4.2
Running the pump (test operation)
Warning
Do not operate the pump if any abnormal condition is observed or if there is
anything wrong with the parts, components, and others during the check before
test operation. Failure to observe this may cause an injury, failure, accident, or
other problems.
Warning
Be sure to put a shaft coupling protective cover during operation. Failure to
observe this you may cause an injury.
Warning
Be sure to attach the cover of the terminal box of the motor. Failure to observe
this may cause an electric shock.
Warning
Before turning the pump shaft by hand to check its rotation, be sure to turn off the
main power. An unexpected start of the pump may cause an accident.
