Service info
3.2 - SWITCHING
-
open the gas tap;
-
set the switch on the system upstream the
boiler to ON (power light
B
on);
-
Select the operating mode by turning the
selector
A
to the required position
(sum-
mer / winter / anti-freeze)
: the power light
B
will come on. In the
summer
position
the boiler will only produce D.H.W. In the
winter
position it will also produce hot wa-
ter for the heating system. In the
anti-fre-
eze
position no hot water is produced and
the boiler is protected against freezing.
-
set the temperature value required for the
heating system using the heating water
control knob
C
;
-
Turn the D.H.W. temperature control knob
D
to the required temperature setting. If the
temperature of the water in the boiler is less
than the set value, the boiler will start up
and heat it to that temperature.
The D.H.W. heating will function always
has precedence over the heating func-
tion.
The temperature setting range is 40-60°C.
When the knob is in a central position, the
water is about 50°C.
Warning
: when starting the boiler after a long
period of inactivity, especially boilers powe-
red by LPG, air bubbles may have formed in
the supply pipe.
Before switching on the boiler switch on
another gas powered device (e.g. cooker gas
ring).
Even so the boiler may block once or twice.
Reset the boiler using the reset button
F
(see
below)
Boiler cut off
If the boiler does not function correctly it au-
tomatically cuts off: the cut off light
E
on the
control panel comes on. In this case:
-
check that the gas tap is open and that
there is a gas supply, for example by li-
ghting a gas ring;
-
if there is a gas supply wait for a minute
before restarting the boiler using reset but-
ton
F
; if the boiler does not restart, try to
reset the boiler three times and then call
an authorised Service Centre or qualified
maintenance personnel.
If the boiler cuts off frequently, this indicates
that there is a recurring anomaly. In this case
contact qualified personnel or an authorised
Service Centre for maintenance.
3.3 - MAINTENANCE
The boiler must be serviced once a year.
Correct maintenance allows the boiler to work
optimally, respecting the environment and
without endangering people, animals and pro-
perty.
The boiler must be serviced by qualified per-
sonnel.
The user may only clean the exterior cover
of the boiler, using furniture cleaning pro-
ducts.
Do not use water!
Information for the user
The user can access only the parts of the
boiler which can be reached without the
need for tools and/or implements: it is the-
refore forbidden to disassemble the exte-
rior cover of the boiler and tamper with the
interior parts.
No-one, including qualified personnel, may
make modifications to the boiler.
UNICAL declines all responsibility for injury
to persons and animals and damage to pro-
perty resulting from tampering or impro-
per operations on the boiler.
If the boiler remains inactive and disconnected
from the power supply for long periods it may
be necessary to reset the pump.
This operation, which entails disassembling
the outside cover and working on internal par-
ts of the boiler, must be performed by quali-
fied personnel.
It is possible to prevent the pump from
blocking by adding special filming products
suitable for multi-metal systems to the water.
If the boiler is not disconnected from the mains
power supply the pump will not block becau-
se the boiler’s electronic system has an anti-
block programme. In this case the pump goes
into operation for a few seconds every day.
The boiler is fitted with an anti-freeze system
setting by selector
A
.
This device switches on automatically:
-
for the heating system
- when
the tem-
perature of the water in the boiler drops
below 7°C
the circulating pump starts up.
If the temperature drops below 5°C, the
burner ignites and stays on for up to 15
minutes or until the water temperature rea-
ches 15°C.
- for the D.H.W. system
- when the tempera-
ture in the boiler is less than 6°C, the bur-
ner ignites and stays on for up to 15 minu-
tes or until the water temperature reaches
15°C.
WARNING
This system is not activated if the boiler is
not connected to the mains supply and the
gas tap is closed.
IMPORTANT
When the boiler anti-frost protection function
is active, both the central heating and D.H.W.
functions are deactivated, which means the
anti-frost protection of the ambient thermostat
is also deactivated.
The boiler protects the central heating system
indirectly. If the boiler is installed in a separa-
te boiler room, the central heating system may
be at a lower temperature than the boiler and
there is the risk of frost, the boiler must be
switched to Winter mode as a safety measu-
re. This protects both the boiler and the sy-
stem from frost, but the boiler keeps the sto-
rage tank at the set temperature. This system
protects the heating system against freezing,
not the D.H.W.
circuit.
The heating system can also be effectively
protected against freezing using specific anti-
freeze products suitable for multi-metal sy-
stems.
Do not use car engine anti-freeze products
and check the effectiveness of the product
over time.
The boiler has a temperature and pressure
gauge which allows you to check the tempe-
rature and pressure of the water in the heating
system.
When the boiler is switched off the pressure
of the water must be around 1 bar.
If this value drops then use the pressure con-
trol tap to adjust to the correct value.
WARNING
After adjusting the pressure, close the tap
without over-tightening it. If the tap is not clo-
sed properly the pressure could rise, resulting
in the safety valve opening and the water le-
aking.