DAB BMH Installationsanweisung Und Wartung Seite 24

9.5 If a lower speed is selected, considerable energy saving may be obtained and less
noise.
9.6
Twin circulators must have their motors set at the same speed.
10. MAINTENANCE
Maintenance must be entrusted to qualified personnel and carried out
respecting the warnings given in this manual.
10.1 When correctly installed, the circulator does not require any maintenance during
operation.
10.2 From time to time it is recommended to check the absorbed current and the head, so
as to prevent malfunctions.
10.3 Before restarting the circulator after the summer season, ensure that motor shaft is
not blocked by scale deposits. If this should occur, unscrew the breather cap when
the system is cold and turn the motor shaft with a screwdriver (fig.2).
10.4 In the bottom of the pump body there are drainage holes for water that forms due to
condensation. Ensure that these holes are not blocked by foreign bodies or dirt
deposits.
10.5 If the motor has to be dismantled from the pump body, it is recommended to replace
the seal, ensuring that is correctly positioned during reassembly.
11. TROUBLESHOOTING
FAULT
1. The circulator
does not start.
2. The system is
noisy.
3. The circulator is
noisy.
4. The circulator
starts and then
stops after a
short time.
CHECK (possible cause)
A. No supply voltage.
B. Incorrect supply voltage.
C. Faulty capacitor (single-phase
motors).
D. Rotor blocked by deposits on
the bushes.
A. Flow rate too high.
B. Air in the system.
A. Air in the pump.
B. Intake pressure too low.
C. The pump is turning in the
wrong direction (three-phase
pumps).
A. No power supply on one phase
(three-phase motors).
B. Dirt or scale between the rotor
and the stator lining or between
the impeller and the pump
body.
ENGLISH
A. Check the electric connections
and the fuses.
B. Check the data on the plate and
apply the correct voltage. Check
the window in the terminal
board to ensure that the set
voltage is the same as the
mains voltage.
C. Change the capacitor.
D. Select the maximum speed
and/or free the rotor with a
screwdriver.
A. Select a lower speed.
B. Bleed the system.
A. Bleed the circulator.
B. Increase the intake pressure.
C. Invert the electrical connection
of the terminal board.
A. Check the connections and
correct supply of the 3 phases.
B. Check that the shaft is turning
freely. Remove any dirt and/or
scale.
23
REMEDY