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3.7
SYSTEM FILTER
The hydronic module has a filter on the system return fitting to
keep the system in good operating conditions.
Periodically and when necessary, the filter can be cleaned as de-
scribed below (Fig. 37).
Close the tap (4) and the tap (3) with a 12mm spanner, drain the
water contents in the hydronic module using the drain tap (4).
Open the cap (1) and clean the filter (2).
3.8
TROUBLESHOOTING
Maintenance operations must be carried out by an au-
thorised company (e.g. Authorised After-Sales Techni-
cal Assistance Service).
Noise due to air in the system.
Check opening of the hood of the special air vent valve (Fig. 21).
Make sure the system pressure and expansion tank factory-set
pressure values are within the set limits.
The factory-set pressure values of the expansion vessel must be 1.0
bar, the value of system pressure must be between 1 and 1.2 bar.
Red pump LED.
There can be three possible causes for this anomaly:
- Low power supply voltage. About 1-2 seconds after the voltage
drops below 145Vac, the LED switches from green to red and the
pump stops. Wait for the supply voltage to raise above 155Vac
approximately: the pump starts back up and the LED goes back
to green with a delay of about one second (Note: naturally the
flow rate decreases with the decrease of the supply voltage).
- Rotor locked. Powering the pump with the rotor seized, after
about 4 seconds the LED switches from green to red. Carefully
act on the screw in the middle of the head to manually release
the crankshaft; circulation starts up immediately after the rotor
is released and the LED switches from red to green after about 10
seconds.
- Elettrical fault. Pump, wiring or P.C.B. fault. Check the indica-
ted components.
1
2
3
4
5
37
53
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