5
UNICA BHE
GETTING STARTED
2.1
BEFORE SWITCHING ON
Before switching the appliance on please familiar-
ise 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;
●
any external thermostats and their functions;
●
the appliance controls.
2.2
APPLIANCE CONTROLS (see fig. 1)
The appliance controls are situated on the lower
front of the appliance. The appliance controls
include:
●
pressure gauge;
●
appliance mode selector;
●
temperature selector;
●
2-digit LED display;
●
burner ON mode (green);
●
fault indicator (red);
●
optional integral time clock/programmer (if fit-
ted).
The
pressure gauge
shows the current pressure
of your heating system, the gauge should be set
between 1 and 1.5 BAR. When the appliance is
operating the gauge may rise or fall slightly, this is
quite normal. The minimum permissible level for
the safe and efficient operation of the appliance is
0.5 BAR. Should the pressure fall below 0.5 BAR,
the boiler may lockout.
The
appliance mode selector
is used to switch
the boiler to the various operating modes:
●
OFF/RESET “
”
●
DHW MODE ”
”
●
CH MODE “
”
●
●
●
●
●
CH with PREHEATING MODE “
”
NOTE
The appliance frost protection is active in all of
the above modes.
The
temperature selectors
can be used to vary
the temperature of the water that circulates around
your radiators and the water that flows from your
hot water taps. The temperature range is adjustable
between 40
o
C and 80
o
C for the central heating, and
between 35
o
C and 60
o
C for the hot water. Moreover
if floor heating mode is selected (by using the
relative jumper), the temperature range for CH
mode can be modified between 20°C and 45°C.
The
2-digit LED display normally
shows the
operating temperature of the appliance, however it
can also display additional characters or flashing
numbers to signify specific operating modes or
fault codes.
When the
status indicator (Green) is lit
it indicates
that the flame is present and the burner is ON.
When the
fault indicator (Red) is lit
it indicates
that the appliance has identified a possible fault
and performed a safety lockout.
The
integral time clock (when fitted)
can be
used to switch the heating on and off at pre-
determined intervals. The
integral time clock or
programmer (when fitted)
can be used to switch
the heating and/or hot water 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 programmer, the boiler will begin
an ignition sequence. When the appliance reaches
the 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 satisfied,
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
O
C to a maximum of
80
O
C (if standard CH mode is selected).
2.5
ADJUSTING THE HOT WATER 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 35
O
C to a maximum of
60
O
C. If the temperature at the outlet is still not
sufficiently hot enough, it may be necessary to
reduce the flow 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.
