DAB 2 JET SET, Instruction For Installation And Maintenance

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ENGLISH
27
FAULTS POSSIBLE CAUSES REMEDIES
DURING OPERATION OF THE
SET THE PUMPS START AND
STOP TOO FREQUENTLY. 1.
2.
Expansion vessels damaged.
Starting and stopping pressure
calibrations too close. 1.
2.
Empty them and check the preloading
(see paragraph “Instructions for running
the set”).
Replace the diaphragm if it has a hole.
Change the settings (see paragraph
“Regulating the set”).
THE SET DOES NOT SUPPLY
THE REQUIRED
CHARACTERISTICS. 1.
2.
3.
4.
5.
6.
7.
8.
9.
The set chosen is undersized for the
characteristics of the system.
Excessive water consumption for the
flow rate of the well (set above head) or
of the first collection tank (set below
head or above head).
Motors turning in inverse direction.
One or more pumps clogged.
Pipes clogged.
Foot valve clogged or blocked (set
above head).
Water recycling between the pumps in
the set.
Interception valves at suction and
delivery of each pump partly closed.
Air infiltrations in the suction pipe of the
set. 1.
2.
3.
4.
5.
6.
7.
8.
9.
Change it, consulting the Technical
Catalogue.
Increase the flow rate that can be supplied
by the well or by the first collection tank.
Change it, performing the operation
described in point 5.5. of the paragraph
“Starting up”.
Dismantle them and clean the pump body
and the impellers, ensuring that they are
in good condition.
Clean them or change them.
Clean it or change it.
Check correct operation of the non return
valves at suction of each pump.
Open them completely.
Testing under pressure, check the perfect
seal in the couplings, the joins and the
pipes.
ONE OR MORE PUMPS IN THE
SET, WHEN STOPPED, TURN IN
THE OPPOSITE DIRECTION. 1.
2. The respective non return or foot valves
do not close well or are blocked.
The respective suction pipe is not
hermetically sealed. 1.
2. Check its seal and correct operation.
Testing under pressure, check the seal.
THE MOTOR OF A PUMP IN THE
SET IS VIBRATING. 1.
2.
3.
4.
Contacts o the respective remote control
switch worn or faulty.
Pump blocked.
Bearings worn.
Phase missing (only in three-phase). 1.
2.
3.
4.
Change the remote control switch.
Free it.
Change it.
Check the motor power supply.
WATER HAMMER IN THE
SYSTEM. 1.
2.
Water hammer during operation of the
set.
Water hammer when turning off the
flow. 1.
2. Check the non return valve of the hot
water distribution mains.
Install more expansion vessels or water
hammer dampers in the pipe concerned.
A PUMP IN THE SET STOPS AND
DOES NOT START AGAIN. 1.
2.
3.
4.
5.
Tripping of the internal motor protection
(only for single-phase pumps).
Tripping of the motor protection (only
for single-phase and three-phase
pumps).
Excessive energy consumption.
No current is reaching the coil of the
respective remote control switch.
Remote control switch coil interrupted.
Pressure switches or pressure transmitter
faulty or clogged. 1.
2.
3.
4.
5.
Wait for the motor to cool down.
See the instructions booklet for the E-
BOX Electric Panel.
The pump turns under excessive force,
due to dirt, lack of a phase, dry operation,
worn bearings etc… Eliminate the cause.
Use an tester to check the electric circuit
as far as the coil itself and repair any
interruption found.
Change it.
Clean them or change them.