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2.7 APPLIANCE SWITCH-OFF
Switch the appliance off by putting it in “off” mode, disconnect the omnipolar switch outside of the appliance and close the gas cock up-
stream from the appliance.
Never leave the appliance switched on if left unused for prolonged periods.
2.8 RESTORE CENTRAL HEATING SYSTEM PRESSURE
1. Periodically check the system water pressure (the appliance’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 appliance
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.
2.9 DRAINING THE SYSTEM
Emptying the system
1. Ensure that the filling cock is closed.
2. Open the draining cock (Parag. 1.32).
3. Open all vent valves.
4. At the end, close the emptying cock.
5. Close all previously opened vent valves.
If fluid containing glycol was added to the system circuit, make sure it is recovered and disposed of in accordance with standard
EN 1717.
2.10 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.
2.11 ANTIFREEZE PROTECTION
The appliance has an antifreeze function that switches the burner on automatically when the temperature drops below 4°C (standard
protection to minimum temperature of -5°C).
All information about the frost protection can be found in the Installer section.
In order to guarantee the integrity of the appliance and the domestic hot water heating system in areas where the temperature drops be-
low zero, we recommend protecting the central heating system using anti-freeze liquid and installing the Immergas Antifreeze Kit in the
appliance.
2.12 PROLONGED INACTIVITY
In case of prolonged inactivity (e.g. second home), we recommend:
1. to switch off the power supply;
2. completely empty the central heating circuit and the appliance domestic hot water circuit. In systems that are drained frequently,
filling must be carried out with suitably treated water to eliminate hardness that can cause lime-scale.
2.13 CLEANING THE CASE
1. Use damp cloths and neutral detergent to clean the appliance casing.
Never use abrasive or powder detergents.
