15
11
INS
TALLER
US
ER
MAINTEN
AN
CE TECHNI
CI
AN
BOTTOM VIEW
Key:
1 - Filling valve
2 - Draining valve
2.7 BOILER SHUTDOWN.
Press the button
(part. 2 Fig. 10)
( ) until the
symbol appears on the display ( ).
NOTE:
in these conditions the boiler is still
powered.
Disconnect the external omnipolar boiler switch
and close the gas cock upstream of 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 value of
between 1 and 1.2 bar.
If the pressure is below 1 bar (with the circuit cool)
restore normal pressure via the filling cock located
in the lower part of the boiler (Fig. 11).
N.B.:
close the valve after the operation.
If pressure values reach around 3 bar the safety
valve may be activated.
In this case, remove water from an air vent valve
of a radiator until 1 bar is reached or ask for
assistance from an authorised company.
In the event of frequent pressure drops, contact
a qualified firm for assistance to remove any
system leakage.
2.9 DRAINING THE SYSTEM.
To drain the boiler, use the special draining valve
(Fig. 11 and 9)
.
Before draining, ensure that the filling cock is
closed.
2.10 ANTIFREEZE PROTECTION.
The boiler comes standard with an antifreeze
function that activates the pump and burner
when the system water temperature in the boiler
falls below 4°C (standard protection up to the
min. temperature of -5°C) and stops once it ex-
ceeds 42°C. The antifreeze function is guaranteed
if the boiler is fully operative and not in “block”
status, and is electrically powered. To avoid keep-
ing the system switched on in case of a prolonged
absence, the system must be drained completely
or antifreeze substances must be added to the
heating system water. In both cases the boiler
domestic hot water circuit must be drained.
In systems that are drained frequently, filling
must be carried out with suitably treated water
to eliminate hardness that can cause lime-scale.
All information relative to the anti-freeze protec-
tion is stated in
Par. 1.3
.
In order to guarantee
the integrity of the appliance and the domestic
hot water heating system in areas where the
temperature falls below zero, we recommend
the central heating system is protected using
anti-freeze liquid and installation of the
Im-
mergas Anti-freeze Kit
in the boiler. In the case
of prolonged inactivity (second case), we also
recommend that:
- disconnect the electric power supply;
- empty the boiler domestic hot water circuit
via the drain valves (
Fig. 9
) and the internal
domestic hot water distribution network.
2.11 CASE CLEANING.
Use damp cloths and neutral detergent to clean
the boiler casing. Never use abrasive or powder
detergents.
2.12 DECOMMISSIONING.
In the event of permanent shutdown of the
boiler, contact an authorised company for the
suitable procedures and also ensure the electri-
cal, water and fuel supply lines are shut off and
disconnected.