31
2-8
1
2
3
INS
TALLER
US
ER
MAINTEN
AN
CE TECHNI
CI
AN
Key:
1 - Gas cock
2 - Cold water inlet
cock
3 - System filling valve
2.8 BOILER SHUTDOWN
Switch the boiler off by pressing the “
” but-
ton, disconnect the onmipolar switch outside of
the boiler and close the gas cock upstream of the
appliance. Never leave the boiler switched on if
left unused for prolonged periods.
2.9 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 (when the circuit is
cold) restore normal pressure via the relevant cock
located to the right of the boiler and accessible from
the side door (Fig. 2-8).
N.B.:
close the cock 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 reaching pressure of 1 bar, or
ask for assistance from professionally qualified
personnel.
In the event of frequent pressure drops, contact
qualified staff for assistance to eliminate the pos-
sible system leakage.
2.10 SYSTEM DRAINAGE.
To drain the boiler, use the special draining valve
(Fig. 1-32 / 1.33).
Before draining, ensure that the filling cock is
closed.
2.11 STORAGE TANK DRAINING.
To drain the storage tank, use the special draining
valve (Fig. 1-32 / 1.33).
N.B.:
before performing this operation, close
the boiler cold water inlet valve and open any
DHW system hot water valve in order to air
into the cylinder.
2.12 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.
The antifreeze 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 on and 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;
- fully drain the central heating circuit, the boiler
domestic hot water circuit and the condensa-
tion trap. In systems that are drained frequently,
filling must be carried out with suitably treated
water to eliminate hardness that can cause lime-
scale.
1st Level Button
2nd Level
Button
Description
M9
D
C
P91
D
C
Displays the current temperature of the low temperature zone number 2
P92
D
C
Displays the current temperature of the low temperature zone number 3
P93
D
C
Defines the flow temperature of the zone number 2 at low temperature.
With external probe (Optional) fitted the flow temperature may be corrected with respect to the
operation curve set by the external probe. See OFFSET on external probe graph (Fig. 1-7) changing
temperature from -15°C to +15°C.
P94
D
x
select
C
Defines the flow temperature of the zone number 3 at low temperature.
With external probe (Optional) fitted the flow temperature may be corrected with respect to the
operation curve set by the external probe. See OFFSET on external probe graph (Fig. 1-7) changing
temperature from -15°C to +15°C.
Zone Menu (optional) “M9”.
The “M9” zone
menu is only activated if the board detects con-
nection to an additional zone board (optional).
This menu contains the temperature settings of
additional zones.
2.13 CASE CLEANING.
Use damp cloths and neutral detergent to clean
the boiler casing. Never use abrasive or powder
detergents.
2.14 DECOMMISSIONING.
In the event of permanent shutdown of the boiler,
contact professionally qualified staff for the rela-
tive procedures and ensure that the electrical,
water and fuel supply lines are disconnected and
that the solar collector is covered.
