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2.13 APPLIANCE SWITCH-OFF
Switch off the appliance by setting 'stand-by' mode on the control panel, switch off the appliance's outer omnipolar switches and close the
gas tap upstream of the appliance.
Never leave the appliance switched on if left unused for prolonged periods.
2.14 RESTORE CENTRAL HEATING SYSTEM PRESSURE
1
2
3
1. Periodically check the system water pressure (the appliance's pressure gauge hand must indicate a cold value between 1 and 1.2 bar).
2. If the pressure is below 1 bar (with the circuit cool), restore normal pressure from the relative cock (Det. 5, Fig. 51).
3. Close the cock after the operation.
4. If the pressure rises to values close to 3 bar, there is a risk of the safety valve tripping (in this case, remove water from an air release
valve on a radiator or by acting on the drain valve (Det. 5, Fig. 51) until the pressure is restored to 1 bar, or call in professionally quali-
fied personnel).
If the system is hot, be sure to let it cool down before draining to avoid the risk of scalding.
5. In the event of frequent pressure drops, contact qualified staff for assistance to eliminate the possible system leakage.
2.15 DRAINING THE SYSTEM
To drain the boiler, use the special draining valve (Part. 5, Fig. 51).
Before draining, ensure that the filling cock is closed.
If fluid containing glycol was added to the system circuit, make sure it is recovered and disposed of in accordance with standard
EN 1717.
76
5
4
Key (Fig. 51):
1
- Safety valve drain
2
- GAS cock
3
- Cold water inlet cock
4
- System filling valve
5
- System draining valve
51
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