Teral NX-VFC-e - 5 Preparation for Operation; Points to be Checked before Test Operation

5-1
5. Preparation for operation
5.1 Points to be checked before test operation
5.1.1 Electrical system
Warning
Before carrying out work such as wiring change, be sure to shut down
the power of the panel board and confirm that the pilot lamp is turned
off. Otherwise, it may lead to an electric shock.
(1) Check if the unit is correctly wired.
(2) Check if the terminals are securely connected.
(3) Check if the unit is securely grounded.
5.1.2 Pump system
(1) Check that the water level of the receiver tank is between the dry-run recovery level and the full water level.
(2) Ensure to fully open each sluice valve on the suction side, and to fully close each sluice valve on the
discharge side.
(3) Check that the TJ valve is open.
If the TJ valve is shut, the water supply unit does not run normally.
(4) Rotate each pump shaft by hand to check that it can rotate smoothly.
To rotate it by hand, insert a screwdriver into the slot at the shaft end through the hole on the external fan
cover of the motor. The rotation must be smooth without binding (no sticking points).
Warning
Always turn off the main power of the water supply unit, before rotating
each pump shaft by hand to check.
(5) Loosen the air vent plug of each pump to relrease air from the pump. At the same time, rotate the pump
shaft by hand to completely expel air from the impeller.
When water overflows and no air bubbles out, priming is complete.
Caution
Never run the pumps without priming.
Otherwise, the sliding parts inside each pump may seize up, thus
resulting in damage to the mechanical seal, water leakage, and/or
other problems.