Boiler Shutdown - Immergas HERCULES Solar 26 1 A Instruction Booklet And Warning

2.7 BOILER SHUTDOWN

Switch the boiler off by pressing the "
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.
2.8 RESTORE CENTRAL HEATING
SYSTEM PRESSURE.
Periodically check the system water pressure.
The boiler pressure gauge should read a pressure
between 1 and 1.2 bar.
If the pressure falls below 1 bar (with the circuit
cool) restore normal pressure via the valve located
in the right of the boiler and accessible from the
lateral door (Fig. 2-8).
N.B.: close the valve after the operation.
If pressure values reach around 3 bar the safety
valve may be activated.
In this case contact a professional technician
for assistance.
In the event of frequent pressure drops, contact
qualified staff for assistance to eliminate the pos-
sible system leakage.
2.9 SYSTEM DRAINING.
To drain the boiler, use the special draining valve
(Fig. 1-21/1-23)
Before draining, ensure that the filling valve is
closed.
2.10 CYLINDER DRAINING.
To drain the cylinder, use the relevant cylinder
draining valve (Fig. 1-21/1-23)
N.B.: 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 cylinder.
2.11 ANTI-FREEZE PROTECTION.
The boiler comes standard with an anti-freeze
function that activates the pump and burner
when the system water temperature in the boiler
falls below 4°C.
The anti-freeze function is only guaranteed if:
- the boiler is correctly connected to gas and elec-
tricity power supply circuits;
- the boiler is powered constantly;
- the boiler is not in stand-by ( )
- the boiler is not in no ignition block (Par.
- the boiler essential components are not faulty.
In the case of prolonged inactivity (second
home), we also recommend to:
- disconnect the electric power supply;
- the drain the central heating circuit and boiler
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.
2.12 CASE CLEANING.
Use damp cloths and neutral detergent to clean
" button,
the boiler casing. Never use abrasive or powder
detergents.
2.13 DECOMMISSIONING.
In the event of permanent shutdown of the boiler,
contact professional staff for the procedures and
ensure that the electrical, water and gas supply
lines are shut off and disconnected and that the
solar collector is covered.
1
2
3
Key:
1 - Gas cock
2 - Cold water inlet
valve
3 - System filling valve
Fig. 2-8
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