Immergas ZEUS 24 - Page 17

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INSTALLATORUSERMAINTENANCE
17 - IE
2.7 RESTORING HEATING SYSTEM
PRESSURE.
Periodically check the system water pressure.
e 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 at the
bottom of the boiler (Fig. 2-2).
N.B.: close the valve aerwards.
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
possible system leakage.
2.8 DRAINING THE SYSTEM.
To drain the boiler, use the special drain cock
(Fig. 2-2).
Before draining, ensure that the lling cock is
closed.
2.9 ANTIFREEZE 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 and stops once it exceeds 42°C. e
antifreeze function is guaranteed if the boiler is
fully operative and not in “block” status, and is
electrically powered. To avoid keeping the system
switched on in case of a prolonged absence, the
system must be drained completely or antifreeze
substances added to the heating system water.
In both cases the boiler domestic 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.
N.B.: if the boiler is installed in places where the
temperature falls below 0°C the domestic water
and heating attachment pipes must be insulated.
2.10 CASE CLEANING.
Use damp cloths and neutral detergent to clean
the boiler casing. Never use abrasive or powder
detergents.
2.11 DECOMMISSIONING.
In the event of permanent shutdown of the boiler,
contact professional personnel for the procedures
and ensure that the electrical, water and gas supply
lines are shut o and disconnected.
BOTTOM VIEW
1 - Boiler drain cock
2 - Domestic water inlet cock
3 - Gas cock
4 - System drain cock
5 - System lling valve