4-1
4.
Preparation for operation
4.1
Points to be checked before test running
4.1.1. Checking the electrical system
Warning
Before changing the wiring, etc., be sure to turn off the main power
supply. Otherwise, you may receive an electric shock.
Warning
Do not use the product at any voltage different from the rated voltage.
A fire or electric shock may occur.
(1) Check that wiring is correct.
(2) Check that the terminals are securely connected.
(3) Check that the equipment is securely grounded.
(4) Check that the settings of the overload protection device match the rated current value of the
motor.
4.1.2. Checking the pump system
Warning
Before rotating the pump by hand for checking, be sure to turn off the
main power supply of the pump.
Warning
At the time of priming (air release), prevent the motor or the parts from
being damaged by spouting water. When handling hot water, be careful
not to suffer burns.
Caution
Never run the pump without priming. Otherwise, the sliding parts in the
pump may seize up.
(1) Rotate the pump shaft by hand to check smooth rotation. Remove the coupling guard, and hold the
coupling to rotate the pump by hand. The rotation must be smooth without binding (no sticking
points).
(2) Priming (air release)
Caution
Do not excessively tighten the air vent plug needle.
Otherwise, damage or water leakage may occur.
(2-1)
For inflow operation
•
Close the sluice valve on the discharge side of the pump.
•
Loosen the air vent plug needle.
•
Slowly open the sluice valve on the suction side.
•
Rotate the pump by hand to completely expel air from the inside.
•
Check that water comes from the air vent plug.
•
Tighten the air vent plug needle.
•
Fully open the sluice valve on the suction side.
