Promac Green PU Service Manual download pdf (Page 28)

espresso coffee machine - instructions for technician

English

THE PUMP WORKS ONLY

WITH THE MANUAL DELI-

VERY KEY

Indication Cause Solution

1) The pump fuse of the electronic control unit

is burned out

1) Replace pump fuse of the electronic control

unit (10 A)

SHUTDOWN OF

ELECTRONIC

SYSTEM

1) The control unit fuse is burned out

2) The volumetric dosing device has a contact

of the positive pole to the earth

1) Replace the main fuse (125 mA)

2) Check for proper connection of the volumetric

dosing device

THE PUMP

LEAKS WATER

1) Poor mechanical seal of the shaft or

of the O-ring

2) The inlet and outlet connections are loose

3) The hex nut of the pressure relief valve

or of the filter are loose

The gasket or the O-ring of the pressure relief valve

or of the filter are defective.

1) Check the status of the pump

and take any corrective action which may be required

2) Tighten the connections

3) Tighten the hex connection of the modulating

valve and of the filter

Replace the gasket and the O-ring. Take care

not to change the calibration of the valve

THE PUMP FUNCTIONS

BELOW THE NOMINAL

CAPACITY

1) The inlet is clogged, perhaps only partially

2) The pump rotates in the wrong direction.

3) The pressure relief valve is not properly calibrated

4) The motor runs at low RPM

5) The inside of the pump is damaged

due to the infiltration of foreign bodies

1) Clean the filter holder

2) Check the motor

3) Calibrate the pressure relief valve

4) Check the voltage or replace the motor

5) Replace the pump

1) The pump and the engine are not aligned.

2) The gasket or the O-ring of the pressure relief valve

or of the filter are defective.

3) The joint, the coupling screw or the

V-shaped clamp are loose.

4) The inlet is clogged, perhaps only partially

5) The hex nut of the pressure relief valve

or of the filter is loose

1) Install the pump-motor joint

Replace the gasket and the O-ring. Take care

not to change the calibration of the valve

3) Align and tighten the components which are

loose

4) Clean the filter holder

5) Tighten the hex connection of the pressure relief

valve and of the filter

THE MOTOR STOPS

SUDDENLY OR

THE THERMAL PROTECTION

CUTS IN DUE TO

AN OVERLOAD

1) Lime scale and mineral build-ups in the

pump have caused it to jam

2) The pump and the engine are not aligned.

3) The motor is defective

4) The motor is connected with a voltage that

is not correct

1) Check the status of the pump

and if necessary replace it

2) Install the pump-motor joint

3) Replace the motor

4) Ascertain that the power supply voltage

of the motor is the right one

THE PUMP

IS NOISY

1) Steam pockets in the delivery system

Air pockets in the hydraulic circuit

3) Coffee is ground too finely

4) The flow reducer of the group is not suitable

1) Reduce water temperature

2) Check the cause and eliminate the problem

3) Adjust the grinding suitably

4) Replace the flow reducer

THE CUP IS

DIRTIED BY

SPLASHES OF COFFEE

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Promac Green PU Service Manual Page 28

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