10.5 - Expansion Vessel
See paragraph 1.2 for the operations to check and adjust the air pressure in the expansion vessel and to replace it if it is broken.
To access the valve of the expansion vessel, proceed as follows:
1. remove the access door to the special maintenance compartment (Fig.1 Face F) disengaging the 2 fixing screws with the accessory tool. It is
advisable not to remove the screws completely, so that you can used them to extract the door. Take care not to drop the screws inside the system
once you have removed the door (Fig. 24);
2. slip the rubber cap off the valve or the expansion vessel (Fig. 24);
3. regulate the valve as indicated in paragraph 1.2 (Fig. 24);
4. reposition the rubber cap (Fig. 24);
5. reposition the door and tighten the 2 screws (Fig. 24).
11. TROUBLESHOOTING
Before starting to look for faults it is necessary to disconnect the power supply to the pump (take the plug out of the socket).
Fault
The pump does not start.
The pump does not start.
The pump does not start.
The pump does not stop.
Insufficient delivery
LED
Probable Causes
Red: off
White: off
No electric power.
Blue: off
Red: on
White: on
Shaft blocked.
Blue: off
Red: off
Utility at a level higher than
White: on
the system restarting pressure
Blue: off
level (par. 3.2).
1. Leak in the system.
2. Impeller or hydraulic part
Red: off
clogged.
White: on
3. Air getting into the suction
Blue: off
pipe.
4. Faulty flow sensor
1. Suction depth too high.
Red: off
White: on
2. Suction pipe clogged or
Blue: off
diameter insufficient.
ENGLISH
Figure 23
Remedies
Check whether there is voltage in the socket and insert the plug again.
See paragraph 9.4 (motor shaft maintenance).
Increase the system restarting pressure level by increasing SP or
decreasing RP.
1. Check the system, find and eliminate the leak.
2. Dismantle the system and remove the obstructions (assistance
service).
3. Check the suction pipe, find and eliminate the cause of air getting in.
4. Contact the assistance centre.
1. As the suction depth increases the hydraulic performance of the product
decreases. Check whether the suction depth can be reduced. Use a suction
pipe with a larger diameter (but never smaller than 1").
2. Check the suction pipe, find the cause of choking (obstruction, dry bend,
counterslope, ...) and remove it.
3. Dismantle the system and remove the obstructions (assistance service).
72
Figure 24