Compensating Electropump; Maintenance; Troubleshooting - DAB 1 KDN Instructions Pour L'installation Et La Maintenance

9.

COMPENSATING ELECTROPUMP

9.1. The pump sets may be provided with a self-priming compensating pump, JET models, connected to the delivery
manifold by means of a check valve and an interception ball valve.
Instead the suction, as in any pump of a set according to standards EN 12845 – UNI 10779, is kept independent.
Keep the pressure switch that controls the compensating pump always calibrated with starting and
9.2.
stopping pressures higher than the others. This is indispensable in order to allow this pump to perform
its task of compensating small falls in pressure in the system before starting the main electropumps and
motor pump.
10.

MAINTENANCE

10.1. All our sets are subjected to strict testing of both the electrical and the hydraulic part.
It is unusual for malfunctions to occur, unless due to external or completely accidental causes.
10.2. Below is a table with some suggestions on regulating the set in the event of irregularities in operation.
FAULTS
A PUMP IN THE SET
DOES NOT PRIME.
A PUMP IN THE SET DOES
NOT START.
THE STOP BUTTON DOES
NOT STOP THE PUMP
THE SET DOES NOT SUPPLY
THE REQUIRED
CHARACTERISTICS.
ENGLISH
POSSIBLE CAUSES
1. Suction pipe with insufficient diameter;
excessive use of couplings which cause
sudden variations in direction of the suction
pipe; siphon effect.
2. Suction pipe clogged.
3. Air infiltrations in the suction pipe of the
pump.
4. Foot valve clogged or blocked.
5. Interception valve on suction partly closed.
1. Main motive power switch and/or main
auxiliary circuit switch off (in position "0").
2. Protection overload
transformer and/or of the auxiliary circuit
faulty or tripped.
3. The Diesel motor pump starting batteries are
not efficient.
4. Electric circuit interrupted.
1. Important water leaks in the system, so the
pressure is not re-established above the
opening pressure of the pressure switch (about
1.5 bar above the closing pressure of the
pressure switch, that is the starting pressure of
the electropump and of the motor pump) .
2. A jumper has been fitted on the terminals for
connecting the float for the priming tank (to be
installed in the event of suction above head)
1. The set chosen is undersized for the
characteristics of the system.
2. Excessive water consumption for the flow rate
that can be supplied by the water supply
source (tank, well, mains, etc.)
3. Motors turning in inverse direction.
4. One or more pumps clogged.
5. Pipes clogged.
6. Foot valves clogged or blocked (set above
head).
7. Interception valves at suction and delivery
partly closed.
8. Air infiltrations in the suction pipes of the set
pumps.
1. Check that the suction pipe is correctly
made, as indicated in the paragraph on
"Installation".
2. Clean it or change it.
3. Testing under pressure, check the perfect
seal in the couplings, the joins and the
pipes.
4. Clean it or change it.
5. Open it completely.
1. Switch them on, turning them to position
"1" and check that the two green lights
come on indicating that the panel is live.
switches of the 2. If faulty, change them.
If tripped, reset them.
3. Check the efficiency of the battery chargers
in the motor pump panel (check absorption
of the motor pump panel with ammeters)
If the batteries are inefficient, change them.
4. Use a tester to find the point of interruption
and repair it.
1. Check the joins, couplings and pipes.
2. Remove the jumper in the event of suction
below head.
Insert the float for the priming tank in the
event of suction above head.
1. Replace it with one that suits the required
characteristics.
2. Increase the flow rate that can be supplied
by the water supply source.
3. Change
described in the paragraph on "Starting".
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 them or change them.
7. Open them completely.
8. Testing under pressure, check the perfect
seal in the couplings, the joins and the
pipes.
50
REMEDIES
it, performing the operation