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FAULTS
DURING OPERATION OF THE
SET THE PUMPS START AND
STOP TOO FREQUENTLY.
THE SET DOES NOT SUPPLY
THE REQUIRED
CHARACTERISTICS.
ONE OR MORE PUMPS IN THE
SET, WHEN STOPPED, TURN
IN THE OPPOSITE DIRECTION.
THE MOTOR OF A PUMP IN
THE SET IS VIBRATING.
A PUMP IN THE SET STOPS
AND DOES NOT START
AGAIN.
WATER HAMMER IN THE
SYSTEM.
ENGLISH
POSSIBLE CAUSES
1.
One or more expansion tanks filled with
water.
2.
The minimum operation time of one or
more pumps is set at a very low value.
1.
The set chosen is undersized for the
characteristics of the system.
2.
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).
3.
Motors turning in inverse direction.
4.
One or more pumps clogged.
5.
Pipes clogged.
6.
Foot valve clogged or blocked (set
above head).
7.
Water recycling between the pumps in
the set.
8.
Interception valves at suction and
delivery of each pump partly closed.
9.
Air infiltrations in the suction pipe of the
set.
1.
The respective non return or foot valves
do not close well or are blocked.
2.
The respective suction pipe is not
hermetically sealed.
1.
A motor protection fuse has burnt out.
2.
Fuse holder base slack or faulty.
3.
Contacts o the respective remote control
switch worn or faulty.
4.
Pump blocked.
5.
Bearings worn.
6.
Electric wires broken.
1.
Tripping of the thermal relay.
2.
Excessive energy consumption with
consequent immediate tripping of the
thermal relay.
3.
Motor protection fuses burnt out.
4.
No current is reaching the coil of the
respective remote control switch.
5.
Remote control switch coil interrupted.
6.
The system pressure is not reaching the
respective control pressure switch.
1.
Water hammer during operation of the
set.
2.
Water hammer when turning off the
flow.
17
REMEDIES
1.
Drain and restore the preload of the
expansion tanks, if insufficient (see
paragraph
"Instructions
operation").
Replace the diaphragm of the expansion
tank or the tank itself, if the diaphragm is
perforated.
2.
Increase it.
1.
Change it, consulting the Dab Technical
Catalogue.
2.
Increase the flow rate that can be supplied
by the well or by the first collection tank.
3.
Change it, performing the operation
described in point 5.5. of the paragraph
"Starting up".
4.
Dismantle them and clean the pump body
and the impellers, ensuring that they are
in good condition.
5.
Clean them or change them.
6.
Clean it or change it.
7.
Check correct operation of the non return
valves at suction of each pump.
8.
Open them completely.
9.
Testing under pressure, check the perfect
seal in the couplings, the joins and the
pipes.
1.
Check its seal and correct operation.
2.
Testing under pressure, check the seal.
1.
Change it.
2.
Secure it if slack. Change it if faulty.
3.
Change the remote control switch.
4.
Free it.
5.
Change them.
6.
Check and repair them.
1.
Reset the relay, pressing the button
provided on the relay, after having
checked for correct calibration (see
electric panel instructions booklet).
2.
The pump turns under excessive force,
due to dirt, lack of a phase, dry operation,
worn bearings etc... Eliminate the cause.
3.
Change them.
4.
Use an tester to check the electric circuit
as far as the coil itself and repair any
interruption found.
5.
Change it.
6.
Remove it and clean the connecting
sleeve.
1.
Check the non return valve of the hot
water distribution mains.
2.
Install other expansion tanks or water
hammer deadeners at the end of the pipe
where they occur.
for
set
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