DAB PUMPS 1 KDN Series Instruction For Installation And Maintenance page 52

Klockner Moeller pressure switch type MCS
Undo the 4 screws and remove the cover.
Slacken and remove the locking screw "B" positioned in one of the 12 holes
in the regulating knob "A". (figure 1)
When the regulating knob "A" is turned clockwise, the pump starting and
stopping pressures are increased at the same time.
When it is turned counter-clockwise they are decreased. (figure 2)
When the regulating knob "A" is pressed and turned counter-clockwise, the
differential between the starting and the stopping pressure of the pump is
increased (the starting pressure decreases while the stopping pressure
remains fixed).
When the regulating knob "A" is pressed and turned clockwise, the
differential is decreased. (figure 3)
Replace and tighten the locking screw "B" in the hole in the regulating knob
"A" that is most aligned with one of the two threads under the knob. (figure
4)
Replace the cover and tighten the 4 screws.
8. COMPENSATING ELECTROPUMP
8.1 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 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.
9. MAINTENANCE
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.
Below is a table with some suggestions on regulating the set in the event of irregularities in operation.
FAULTS
1 Suction pipe with insufficient diameter; excessive use of
A PUMP IN THE SET
couplings which cause sudden variations in direction of the
DOES NOT PRIME.
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
A PUMP IN THE SET
switch off (in position "0").
DOES NOT START.
2 Protection overload switches of the 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
THE STOP BUTTON
re-established above the opening pressure of the pressure
DOES
switch (about 1.5 bar above the closing pressure of the
NOT STOP THE PUMP
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)
ENGLISH
POSSIBLE CAUSES
47
REMEDIES
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.
If faulty, change them.
2 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.