Immergas VICTRIX ZEUS SUPERIOR 25, Инструкции и рекомендации, Страница: 75 / 128

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2.8 BOILER SWITCH-OFF
Switch the boiler off by putting it in “off” mode, disconnect the onmipolar switch outside of the boiler and close the gas cock upstream
from the appliance.
Never leave the boiler switched on if left unused for prolonged periods.
2.9 RESTORE CENTRAL HEATING SYSTEM PRESSURE
1. Periodically check the system water pressure (the boiler’s pressure gauge hand must indicate a 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 boiler (Fig. 50).
3. Close the cock after the operation.
4. If the pressure reaches values around 3 bar, there is a risk of tripping the safety valve (in this case, remove water from a radiator air vent
valve until a pressure of 1 bar is achieved, or ask for assistance from professionally qualified personnel).
5. In the event of frequent pressure drops, contact qualified staff for assistance to eliminate the possible system leakage.
Bottom view:
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50
Key (Fig. 50):
1 - System filling valve
2 - System draining valve
3 - GAS cock
4 - Storage tank draining valve
5 - Cold water inlet cock
2.10 DRAINING THE SYSTEM
To drain the boiler, use the special draining valve (Fig. 50).
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.
2.11 EMPTYING THE D.H.W. CIRCUIT
To do this, always close the domestic cold water inlet upstream of the appliance.
Open any domestic hot water tap to discharge the pressure from the circuit.
2.12 STORAGE TANK DRAINING
To drain the storage tank, use the relevant storage tank draining valve (Fig. 50).
Before performing this operation, close the boiler cold water inlet valve and open any DHW system hot water valve in order to
allow the inlet of air into the storage tank.