7
When CH water temperature knob
is set to min., CH water temperatu-
re will always be min.
Intermediate CH water tempera-
ture knob settings from min. to
max., gradual CH water tempera-
ture increase from min. to max. will
be slower.
E.g.
When the knob is set to max. and
external temperature is 12°C, the
boiler automatically heats CH water
to 72°C.
When the knob is turned to 3⁄4, and
external temperature is 12°C, the
boiler automatically heats CH water
to 52°C and heating CH water to
83°C when external temperature is
minus 7 (see pic. 2).
1.2.4 Boiler shut-down
Should any malfunction occur, boi-
ler automatically shuts down.
1.2.4.1 Burner shut-down
When the burner shuts down, red
light 5 flashes. Should this happen
proceed as follows:
• Check that the gas stopcock is
open, and gas network is actually
providing service, by lighting a gas
powered kitchen appliance such
as range or oven.
Should a flame occur, wait an addi-
tional minute before resetting the
boiler by turning selector 9 to posi-
tion .
If the boiler still does not start and
after performing three reset proce-
dures, contact a Service Centre or
qualified personnel for service.
1.2.4.2 Shut-down due to overhea-
ting
If the burner shuts down due to
over-heating, red light no. 3 comes
on and flashes.
Should this happen contact a
Service centre or qualified person-
nel for service.
1.2.4.3 Shut-down due to incorrect
flue system draught (flue system
clogging)
Should the burner shut down due
to flue system malfunction (CTN
and RTN models) or air intake and/
or smoke discharge piping mal-
function (CTFS or RTFS models),
light no. 4 comes on and flashes.
Should this happen, contact a
Service Centre or qualified per-
sonnel for service.
1.2.4.4 Shut-down due to low
water pressure
Should shut-down red light no.
6 turn on, it indicates low water
pressure and low water pressure
switch intervention.
Load the boiler by opening tap
A
shown in pic. 3. Water pressure
must be 0.8-1,0 bar while the boiler
is cold.
In case of low water pressure shut-
down, proceed as follows:
• Turn the filling tap counter-
clockwise to let water into the boiler
and keep it opened until pressure
gauge no. 12 in pic. 1 shows that a
pressure of 0.8-1 bar is reached.
WARNING
Once the loading procedure is com-
pleted, properly close loading tap.
Should the tap not be properly clo-
sed, as pressure increases, boiler
CH safety valve may open and water
flow out.
NOTE
Should boiler frequently shut down,
it means a boiler malfunction is in
progress. Contact qualified person-
nel or a Service Centre for service.
1.2.4.5 Shut-down due to tempe-
rature probe malfunction
Should the burner shut down due
to temperature probe malfunction,
the following lights switch on and
flash:
- Red light no. 2 and green light
no.8 when CH probe malfunction
occurs.
- Red light no. 2 when DHW probe
malfunction occurs.
When it occurs, contact a Service
Centre or qualified personnel for
service.
1.3 Maintenance
Routine boiler maintenance is to
be provided according to appli-
cable laws. Correct maintenance
ensures boiler to operate efficien-
tly, environmentally friendly, pre-
venting any danger to people, ani-
mals or property.
Only qualified personnel are legally
allowed to service the boiler.
The Manufacturer recommends
Customers to contact a Service
Centre for maintenance and repairs.
The user may only clean the external
boiler housing, by means of com-
monly marketed household pro-
ducts.
Do not use water!
1.4 Notes for the User
The user may only access boiler
parts that can be reached without
using technical equipment and/
or tools: the user is not authori-
zed to remove boiler housing and
operate on any internal part.
No one, including qualified per-
sonnel, is authorized to modify
the boiler.
The manufacturer shall not be
held responsible for damage to
people, animals, or property due
to tampering or improper work
done to the boiler.
Should the boiler be inactive and
power mains supply disconnected
for a long time, its pump might
not operate.
Pump service includes boiler
housing dismounting and access
to boiler internal parts, therefore
only qualified personnel may per-
form it.
Pump blockage may be avoided
by adding filming additives sui-
table for multi-metal systems to
water.
pic. 3
A
