DAB 1-2-3 NKP-G 32 Serie Instrucciones Para La Instalación Y El Mantenimiento página 23

5.5.
Check that the pumps are turning in the correct direction.
Start each pump for a few moments in MANUAL mode (see electric panel instructions) and check that the motor fan is
turning in the direction indicated by the arrow.
Otherwise, on the panel terminal board, exchange any two wires of the electric panel power cable.
6. INSTRUCTIONS FOR RUNNING THE SET
6.1. Each pump in the set should not be started more than 20 times in one hour to avoid subjecting the motor
to excessive thermal stress.
6.2. If the set remains inactive for long periods, start it by hand periodically to check its efficiency, or activate
the pump anti-block system (see electric panel instructions booklet).
6.3. When the set remains inactive for long periods at a temperature below 0°C, it must be drained
completely. (fig.8)
6.4. With the system empty, periodically check the preload of the expansion tanks, ensuring that it is kept
0.2-0.3 bar below the lowest of the electropump starting pressures. The frequency of this check must be
increased, the greater the frequency of starting and the maximum working pressure of the set.
7. COMPENSATING ELECTROPUMP
7.1. ELECTRIC COMPENSATION PUMP (NOT AVAILABLE FOR NKVE AND NKVE MCE UNITS)
Some units may be supplied with a compensation pump, connected to the suction manifold by means of an interception
valve, and to the delivery manifold by means of an interception valve and a check valve. In sets with 1 pump, the
intakes of the pump and of the compensation pump must be independent
8. MAINTENANCE
8.1. 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.
8.2. Below is a table with some suggestions on regulating the set in the event of irregularities in operation.
FAULTS
THE SET DOES NOT PRIME.
THE SET DOES NOT START.
THE SET DOES NOT STOP.
ENGLISH
POSSIBLE CAUSES
1. Suction pipe with
diameter; excessive us of couplings
which cause sudden variations in
direction of the suction pipe; siphon
2. effect.
3. Suction pipe clogged.
Air infiltrations in the suction pipe of
the set.
4.
5. Foot valve clogged or blocked.
Water recycling between the pumps in
6. the set.
Interception valves on suction of each
pump partly closed.
1. Motive power main switch off (in
position "0").
2. Fuses protecting the
and/or the auxiliary circuit faulty or
3. tripped.
Electric power supply is not reaching
the pump remote control switches.
4.
Electric circuit interrupted.
1. Important water leaks in the system.
17
.
insufficient 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.
Clean it or change it.
4. Check correct operation of the non return
5. valves on suction of each pipe.
Open them completely.
6.
1. Switch it on, moving it to position "1".
transformer 2. If faulty, change them.
If tripped, reset them.
3. Check correct operation of the following
controls placed in series: remote control;
minimum pressure switch; minimum level
float.
4. Use a tester to find the point of interruption
and repair it.
1. Check the joins, couplings and pipes.
REMEDIES