Marco 164 404 15 Instructions For Use Manual page 11

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.
While 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.
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© S.p.A.
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