required and the room thermostat
(if fitted) calls for heat, the
boiler will light and provide central heating.
If a hot water tap is opened the boiler will supply hot water.
NOTE:
(i) To provide
increased
efficiency
when providing
central
heating, the boiler control has a delay built in to prevent rapid
ON/OFF
switching
of the boiler thermostat.
Also, when the
heating
demand
is satisfied,
the pump continues
to run for
approximately
four minutes.
(ii) If the boiler fails to operate, check that the white pointer on
the pressure gauge is not below the red pointer. If necessary,
consult your installer or service engineer.
(iii) If the boiler still fails to operate, press the overheat re-set
button (fig 1) once.
TO TURN THE BOILER OFF
For short periods:
Set the Mains ON/OFF switch to OFF.
To restart, simply set the Mains ON/OFF switch to ON.
For long periods:
Set the Mains ON/OFF switch to OFF. If
frost is likely during the period of shutdown
it is necessary
to
leave the mains electricity
and gas supplies
ON. The inbuilt
boiler frost protection
device will protect the boiler from frost
damage.
To restart, refer to the lighting instructions above.
NOTE: If it is desired to turn off the power and gas supply (e.g.
for a long absence) it is necessary to drain the system.
OPERATING THE OPTIONAL HEATING TIMER (IF
FinED)
The
electronic
timer
display
(24
hr
clock)
provides
a
permanent
display of the time of day and day of the week. If
the boiler is switched off or its power supply interrupted, a built
in battery will operate the display and protect the programme
of operating times etc.
DOMESTIC HOT WATER
TEMPERATURE CONTROL
MAINS ON/OFF
DEMAND
MAINS ON
LIGHT
LIGHT
PRIMARY WATER ".
PRESSURE GAUGE
OPTIONAL
CENTRAL HEATING
TIMER
OVERHEAT RESET
sunON
CENTRAL HEATING
ON/OFF TEMPERATURE
CONTROL
The timer is supplied with a factory set default programme, but
this can be altered by the user. Refer to 'To set the electronic
timer' on page 4.
Operating
mode switch
(1 AUTO 0)
1
=
permanently
on,
this provides
a continuous
central
I
heating
'on' period, overriding
any other programme.
A (.~)
I
symbol appears in the display whenever
the operating
mode
switch is set to 1, to remind you that it is 'on'.
o
=
permanently
'off' - DHW only, no central heating.
AUTO = Timed.
Timer setting
switch
( RUN)
I
Set the switch to C9and the time of day and day of t'he week
can be set using the HR, MIN and DAY buttons as described
below.
Set the switch to
®
and the 'on' and 'off' times for the central
heating can be set as described below.
Set the switch to RUN and your preset programme will start.
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