Immergas MINI EOLO 28 3E - Boiler Shutdown; Restore Central Heating System Pressure; Draining the System; Anti-Freeze Protection

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INSTALLER
USER
MAINTENANCE TECHNICIAN
TECHNICAL DATA
2.7 Boiler shutdown.
For complete boiler switch-o, press the “o” button.
ATTENTION:
In these conditions the boiler is to be
considered still live.
Disconnect the omnipolar switch outside the boiler and close the
gas cock upstream of the appliance. Never leave the boiler switched
on if le unused for prolonged periods.
In case of prolonged inactivity (second house), we also recom-
mend that:
- the electric power supply is disconnected;
- empty the boiler domestic hot water circuit via the drain valves
(Fig. 32) and the internal domestic hot water distribution net-
work.
2.8 Restore central heating system pressure.
Periodically check the system water pressure. e boiler pressure
gauge should read a value of between 1 and 1.2 bar.
If the pressure is below 1 bar (with the circuit cool) restore normal pres-
sure via the lling cock located in the lower part of the boiler (Fig. 34).
N.B.: close the lling cock aer the operation.
If pressure values reach around 3 bar the safety valve may be
activated.
In this case ask for assistance from professionally qualied per-
sonnel.
In the event of frequent pressure drops, contact qualied sta for
assistance to eliminate the possible system leakage.
2.9 Draining the system.
1. Ensure that the lling cock is closed.
2. Open the draining cock (Parag. 1.24).
3. Open all vent valves.
4. At the end, close the emptying cock.
5. Close all previously opened vent valves.
ATTENTION:
if glycol was input in the system’s circuit,
make sure it is discharged into the waste
water system, pursuant to regulation EN 1717.
2.10 ANTI-FREEZE PROTECTION.
e boiler has an anti-freeze function that switches on automat-
ically when the temperature falls below 4°C (standard protection
to minimum temperature of -5°C). In order to guarantee the in-
tegrity of the appliance and the domestic hot water heating system
in zones where the temperature falls below zero, we recommend
the central heating system is protected using anti-freeze liquid
and installation of the Immergas Anti-freeze Kit in the boiler
(Par. 1.4). In the case of prolonged inactivity (second case), we
also recommend that:
- disconnect the electric power supply;
- the central heating circuit and boiler domestic hot water circuit
must be drained. In systems that are drained frequently, lling
must be carried out with suitably treated water to eliminate
hardness that can cause lime-scale.
2.11 Draining the domestic hot water 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 Cleaning the case.
Use damp cloths and neutral detergent to clean the boiler casing.
Never use abrasive or powder detergents.
2.13 Decommissioning.
In the event of permanent shutdown of the boiler, contact profes-
sional sta for the procedures and ensure that the electrical, water
and gas supply lines are shut o and disconnected.
Key:
1 - Filling valve
2 - Draining valve
Bottom view.