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) Make sure that the bypass of the check valve is closed.
Caution
When operating the pump, close the bypass of the check valve.
If the bypass is opened, the check valve will not function.
(5) Manually turn the pump to make sure that it can be rotated smoothly.To manually turn, insert a flat blade
screwdriver into the groove of the shaft end through the hole in the external fan cover of the motor and then
turn it. If it is rotated smoothly and evenly, it will be OK.
Warning
Before manually turning the pump, be sure to turn off the main power
supply of the water supply unit.
Turn using flathead screwdriver
op
en
slide direc
tion
ᵂ
ᵄ
s
lide di
rec
tion
cl
o
s
e
Fig.5-1-2 Bypass of the check valve
