When the taps are open, the pressure in the installation drops until it reaches the
switch-off value, causing the pressure switch to start the motor. If the switch-on and
switch-off pressure do not meet the needs of the user, it is possible to change this
range by means of adjustment of the pressure switch. The switch-on and switch-off
pressure can be set within the range of 1.5 / 4 bar, with minimal pressure difference
between switch-on and switch-off equal to 1.5 bar. In order to perform the adjustment:
- disconnect power supply by unplugging,
- remove the screw securing the cover of the pressure switch and remove the
cover,
- adjust the switch-on pressure by means of the large (longer) adjustment screw
with a nut (screw with a spring). Turning the screw clockwise increases pressure
and anticlockwise - decreases it.
- the switch-off can be adjusted by means of adjustment of the other smaller screw
with a nut. Turning the screw clockwise increases pressure and anticlockwise -
decreases it.
The booster set is equipped with a membrane tank. The tank is pre-filled with air under
pressure of ca. 1.7-2 bar. The best tank capacity is obtained when the initial pressure
in the tank is set to 0.2 bar lower than the switch-on pressure set on the pressure
switch. To pump or discharge air from the tank, use the valve - a vent identical to
those used in car wheels, located in the rear part of the tank. The air pressure in the
tank must be checked at least once every 3 months during continuous use or at the
beginning of the spring-summer season if the booster set is used in a recreational plot
or when excessively frequent switch-on of the pump is found (more frequently than
usual). The air pressure in the tank can be checked when the booster set is unplugged
and the tap is open. When the water pressure in the installation drops to zero, the air
pressure in the tank must be checked with a manometer used for pressure tests in car
wheels, placing it near the vent in the rear part of the tank. If the air pressure is too
low, it must be filled with a car pump. In no case can the air pressure in the tank
exceed 3 bar or be lower than 1 bar. Note: the manometer installed at booster set
shows water pressure in the installation, not the air pressure in the tank.
CAUTION!! Booster pump operation without air in the tank can cause an overload,
resulting in motor failure. Too low or excessive (over 3 bar) pressure in the tank
causes frequent switch-on and off of the booster pump. The motor is much more
loaded during start-up than in continuous operation. Excessively frequent switching on
and off that occur in case of improper air pressure in the tank can cause failures the
results of which are not subject to warranty repairs.
Inspection and filling of the air pressure in the tank are responsibility of the user.
In case of use of Multi1300 INOX pumps, the condition of the filter must be checked
periodically (at least once every two months). Soiled filter dampens the water flow. In
extreme cases, the pump suction can be chocked and it will operate without flow
which results in device failure.
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