4
2.1 BEFORE SWITCHING ON
Before switching the appliance on, please familiarise yourself
with:
- how to isolate the appliance from the gas, water, and electricity
supplies;
- how to check and top-up – if necessary – the system water
pressure;
- the time clock or programmer (if
fi
tted);
- any external thermostats and their functions;
- the appliance controls.
2.2 APPLIANCE CONTROLS (see
fi
g. 1)
The appliance controls are situated on the lower front of the
appliance. The appliance controls include:
- pressure gauge;
- appliance mode selector;
- temperature selectors.
NOTE
The appliance frost protection is active in all the boiler modes.
The
temperature selectors
can be used to vary the temperature
of the water that circulates around your radiators and the water
that
fl
ows from your hot water taps. The temperature range is
adjustable between 40
o
C and 80
o
C for the central heating, and
between 37
o
C and 60
o
C for the hot water.
The display normally shows the current time.
Refer to the main appliance status table for fault indicator and
boiler status.
The integral digital time clock is used to switch the heating on
and off at pre-determined intervals.
2.3 LIGHTING THE BOILER
Ensure the gas and electrical supply to the boiler are
turned on.
Turn the mode selector switch to the
ON
position. When there
is a request for heating or hot water via the time clock or pro-
grammer, the boiler will begin an ignition sequence. When the
appliance reaches the CH set temperature, the burner will go
off for a minimum period of approximately 3 minutes.
When the programmer/time clock or external thermostats
heating request has been satis
fi
ed, the appliance will switch
off automatically.
2.4 ADJUSTING THE HEATING TEMPERATURE
Rotate the temperature selector – clockwise to increase, counter-
clockwise to decrease – to the desired temperature setting. The
temperature can be set from a minimum of 40°C to a maximum
of 80°C (if standard CH mode is selected).
2.5 ADJUSTING THE HOT WATER TEMPERA-
TURE
Rotate the temperature selector – clockwise to increase,
counter-clockwise to decrease – to the desired temperature
setting. The temperature can be set from a minimum of 37°C
to a maximum of 60°C. If the temperature at the outlet is still
not suf
fi
ciently hot enough, it may be necessary to reduce the
fl
ow of water at the hot water outlet (tap).
NOTE
If the appliance fails to ignite during the ignition sequence, it
will enter a lockout condition. Should this occur, please allow
a period of at least two minutes before re-setting the appliance.
2.6 EXPLANATION OF FEATURES
Although the Vokèra
Unica
has been designed for simplicity
of use, it utilises the latest in boiler technology, enabling a host
of functions to be carried out simultaneously.
2.7 AUTOMATIC TEMPERATURE CONTROL
The automatic temperature control function (SARA), permits
the boiler (when the heating temperature selector is set within
the blank bullet points to automatically adjust (raise) the heating.
The activation and the disable of the function is visualized on
the display if the heating temperature is selected between 55°
-65°C.
2. GETTING STARTED
3.1 HOW TO TOP-UP THE SYSTEM PRESSURE
(
fi
g. 1-2)
The system pressure must be checked periodically to ensure the
correct operation of the boiler. The needle on the gauge should
be reading between 1 and 1.5 BAR when the boiler is in an off
position and has cooled to room temperature. If the pressure
requires ‘topping-up’ use the following instructions as a guide.
- Locate the
fi
lling valve connections (usually beneath the
boiler, see
fi
g. 3).
- Attach the
fi
lling loop to both connections.
- Open the
fi
lling valve slowly until you hear water entering the
system.
- Close the
fi
lling valve when the pressure gauge (on the boiler)
reads between 1 and 1.5 BAR (see
fi
g. 1).
- Remove the
fi
lling loop from the connections.
3.2 HOW TO RESET THE APPLIANCE
When the fault code is displayed, the appliance will require
to be reset manually. Before resetting the boiler, check what
action is required to be taken, using the information on the
fault code table on next page. Allow a period of two minutes to
elapse before rotating the mode selector knob across the
position (see
fi
g. 1).
IMPORTANT
If the appliance requires to be reset frequently, it may be indica-
tive of a fault, please contact your installer or Vokèra Customer
Services for further advice.
3. HOW TO...
Fig. 3
control
valve
temporary
connection
control
valve
supply pipe
double
check valve
fl
ow/return
pipe
3.3 HOW TO SHUT DOWN THE SYSTEM FOR
SHORT PERIODS
The system and boiler can be shut down for short periods by
simply turning the time clock to the off position. It is also advis-
able to turn off the main water supply to the house.
3.4 HOW TO SHUT DOWN THE SYSTEM FOR
LONG PERIODS
If the house is to be left unoccupied for any length of time –
especially during the winter – the system should be thoroughly
drained of all water. The gas, water, and electricity supply to
the house should also be turned off. For more detailed advice
contact your installer.
3.5 HOW TO CARE FOR THE APPLIANCE
To clean the outer casing use only a clean damp cloth. Do not
use any scour-
ers or abrasive
cleaners.
