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2.7
APPLIANCE SWITCH-OFF
Switch the appliance off by putting it in "off" mode, disconnect the main switch outside of the appliance and close the gas isolation valve
upstream of the appliance.
Never leave the appliance switched on if left unused for prolonged periods.
2.8 RESTORE CENTRAL HEATING SYSTEM PRESSURE
In boilers purchased integrated in the Trio Pack Hybrid, please refer to the instruction manual of the hybrid heat pump to carry
out this operation.
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 falls below 1 bar (with the system cold) restore normal pressure via the valve located at the bottom of the appliance (Par.
1, Fig. 7).
3. Close the valve 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. 1, Fig. 7) until the pressure is restored to 1 bar, or call in professionally qualified
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.
2.9
DRAINING THE SYSTEM
To drain the boiler, use the special draining valve (Part. 2, Fig. 7).
Before draining, ensure that the filling valve 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.
81
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