Marco 164 660 15, Instructions For Use Manual

Page: 11 / 24

ENG
11
© S.p.A.
ELECTRONIC PRESSURE SENSOR WORKING DIRECTIONS
The electronic pressure sensor, through the use of a microprocessor, controls the pump's speed to
obtain the needed flow rate, with the following advantages:
- Noise reduction during operation
- The optimization of current consumption
- A strong reduction of electrical noise, thanks to the slow speed ramp up and ramp down of
the motor.
- A longer life for the whole system, thanks to less wear of pump parts compared to
conventional mechanical pressure switches.
The pressure sensor system is equipped with two LEDs: one blue and one multicolored (red, green,
and yellow).
During normal operation, the blue LED will:
- Turn on if there's liquid in the hoses.
- Turn off when there's no liquid in the hoses.
- Flash when in priming mode. The first time it senses water it keeps flashing for 10 seconds to
make sure that the water is being pumped correctly and continuously.
If the pump goes more than five times from “priming” to “no liquid” (blue led off) the circuit
turns everything off anyway, to protect the motor and the gears from running without liquid.
The multicolored LED signals:
- With solid yellow LED, that the pressure in the hoses is not the required pressure, but the
pump is trying to reach it.
- With solid green LED, that the pump has reached the target pressure, there is still liquid
demand, but the pump's speed won't be changed because the flow rate is constant.
- With flashing green LED, the pump has reached the target pressure and there is no liquid
demand, it's in stand-by with the motor off.
- With solid or slowly flashing red LED, the motor has been short circuited, something may
have blocked the gears or there could be a problem in the connection between the pump
and circuit. The red LED flashes for 30 seconds, after which the pump is re-fed up to a
maximum of 3 attempts.
On the fourth attempt, the LED remains solid red, the pump is off and should be checked for
possible permanent damage.
To reset this warning you need to reboot the circuit or press the Reset button on the control
panel, if present.
(follows)