Marco 164 622 13-US, Instructions For Use Manual

Page: 5 / 16

© S.p.A.
- With fast flashing red LED, the pump is being overloaded (due to viscous liquids or gears
overheating). While the pump is running, the speed is reduced to keep the current up to the
nominal value for 30 seconds, period after which the circuit tries to release again the motor
to its normal operating speed.
If an overload happens again, the circuit tries three time to lower the speed and it turns the
pump off. Please check that the liquid being pumped is correct for the chosen pump and that
the gears move freely without problems.
To reset this warning you have to reboot the circuit or press the Reset button on the control
panel, if present.
There are two warnings that use both LEDs:
- Red and blue LED that blink alternatively, signal that the pump has run one and a half minute
without liquid and the motor has been stopped for this reason. To reset this warning you have
to reboot the circuit or press the Reset button on the control panel, if present.
- Yellow and blue LED that blink together indicate that the power supply is providing the wrong
voltage. Please check to have the correct wire section for the power supply and a charged
battery, if present.
- Steady red and blinking Blue indicate that the pump has run for more than two hours at very
low speeds and that the motor has been stopped to prevent overheating. To reset this
warning you have to reboot the circuit or press the Reset button on the control panel, if
present.
An expansion tank of at least ½ liter is necessary in the case of short, rigid pipes or in the presence of
solenoid valves, to avoid overpressures during the closing phase caused by a water hammer effect
which could damage the pressure sensor.
The presence of a few meters of flexible pipe inside the system can prevent the installation of the
expansion tank.
Additional pressure regulators or non-return valves on the pump delivery may interfere with the
correct operation of the electronic pressure sensor.
5