3. SYSTEM WATER PRESSURE
The system pressure gauge (G - see
page 3) indicates the central heating
system pressure. If the pressure is seen
to fall below the original installation
pressure of 1-2 bar over a period of time
and continue to fall then a water leak may
be indicated. In this event re-pressurise
the system. If unable to do so or if the pressure continues to
drop a Gas Safe Registered Engineer or in IE a Registered
Gas Installer (RGII) should be consulted.
EFFICIENT HEATING SYSTEM OPERATION
The boiler is a high efciency, condensing appliance which will
automatically adjust its output to match the demand for heat.
Therefore gas consumption is reduced as the heat demand is
reduced.
The boiler condenses water from the ue gases when operating
most efciently. To operate your boiler efciently (using less gas)
turn the central heating temperature knob (C) to the ‘
‘ position
or lower. In winter periods it may be necessary to turn the knob
towards the ‘max’ position to meet heating requirements. This will
depend on the house and radiators used.
Reducing the room thermostat setting by 1ºC can reduce gas
consumption by up to 10%.
WEATHER COMPENSATION
When the Weather Compensation option is tted to the system then
the central heating temperature knob (C) becomes a method of
controlling room temperature. Turn the knob clockwise to increase
room temperature and anti-clockwise to decrease room temperature.
Once the desired setting has been achieved, leave the knob in this
position and the system will automatically achieve the desired room
temperature for all outside weather conditions.
BOILER FROST PROTECTION
The boiler is tted with frost protection that operates in all modes,
provided the power supply to the boiler is always turned on. If
the water in the boiler falls below 5ºC, the frost protection will
activate and run the boiler to avoid freezing. The process does not
guarantee that all other parts of the system will be protected.
If a system frost thermostat has been installed, the boiler must be
set in winter mode, ‘
’, for the system frost protection to run.
If no system frost protection is provided and frost is likely during a
short absence from home it is recommended to leave the system
heating controls or built in programmer (if tted) switched on and
run at a reduced temperature setting. For longer periods, the entire
system should be drained.
BOILER RESTART
To restart the boiler, when directed in the listed fault codes (see
section 8), turn the mode knob (D) to ‘restart’ position and
IMMEDIATELY turn knob back to required setting. The boiler will
repeat its ignition sequence. If the boiler still fails to start consult a
Gas Safe Registered Engineer or in IE a Registered Gas Installer
(RGII).
MAINS POWER OFF
To remove all power to the boiler the mains power switch must be
turned off.
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