8-1
8. Maintenance and inspection
8.1
Precautions for maintenance and inspection
Carry out maintenance and inspection of the water supply unit according to the “8.3 Maintenance check list.”
(1) When carrying out a daily inspection, carefully observe the following points:
c
A large deviation in the pump’s discharge pressure, current, vibration, noise, or other conditions from
the normal status is a possible fault. Therefore, immediately perform detailed inspection and
maintenance. For this purpose, it is recommended to keep an operation log.
d
Check that the unit is running properly in the automatic mode.
e
Check the piping for any water leakage or damage.
f
Check the mechanical seal for any water leakage.
g
Check that the contacts, terminals, and other connections of the control panel are securely tightened
and that there are no entries of water droplets inside.
h
Completely remove water from the pressure tank, and then check that the pre-charge pressure inside
the tank complies with the specifications. Periodically check the pre-charge pressure (at least every 6
months) because the life of the pressure tank depends largely on the pressure.
Ŷ
If you do not use the pump for a long time, observe the following points:
c
To prevent freezing inside the pump in winter, be sure to keep the pump warm enough or completely
drain the pump.
d
If you have a backup pump, run it from time to time to make it available for operation at any time.
Caution
Ensure to carry out a daily/periodic inspection according to the checklist.
Otherwise, it may be impossible to prevent potential failures and
accidents and it also shortens the product life.
Warning
If any problem is found during inspection, immediately stop operation,
and remove the cause or contact Teral. or its relevant service company.
Otherwise, it may lead to an accident.
Connect to the pressure gauge
and inject air through the metal
fixture for pumping (used for car
tires)
Remove the cap.
Air valve
Normal handle
position
Drain water
position
Drain water
from the
pressure tank
[Procedure for checking the pre-charge
pressure in the pressure tank]
c
Stop the operation.
d
Drain water by turning the valve handle to the
“Drain water position.”
e
Remove the cap.
f
Check the pre-charge pressure from the air
valve.
g
Adjust the pre-charge pressure if necessary.
h
Put the cap back in place.
i
Turn the valve handle back to the normal
position, and run water through the system.
j
Restart automatic operation.
Watch out for
scateering water!
[Be sure to install
drain piping with a
hose or other tubes.]
Fig. 8-1 How to check the pressure in the pressure tank
Refer to “3.4 Specification Tables” for pressure tank pre-charge pressure.
When changing the pressure set value, adjust the pressure pre-charge pressure as per the following formula.
(Unit for PH/PL is m
䞉
H
2
O.)
=> Pre-charge pressure [MPa] =
PLx2+PHx1.1-13.7
4.4
x 0.0098
