CENTRAL HEATING
The boiler controls the central heating radiator temperature
to a maximum of 80
o
C, adjustable via the central heating
temperature knob (B).
Approximate temperatures for central heating:
Knob Setting
Central Heating Radiator Temperature (approx.)
Minimum 30ºC
Maximum 80ºC
For economy setting [ ] refer to Ecient Heating System
Operation.
EFFICIENT HEATING SYSTEM OPERATION
The boiler is a high eciency, 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 eciently. To operate your boiler eciently
(using less gas) turn the central heating knob (B) until the leaf
symbol is shown [
]. In winter periods it may be necessary
to turn the knob clockwise towards a higher temperature e.g.
80, to meet your 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 (B) 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 running 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 messages
press the “Restart” button. The boiler will repeat its ignition
sequence. If the boiler still fails to start consult a Gas Safe
Registered Engineer.
MAINS POWER OFF
To remove all power to the boiler the mains power switch must
be turned o.
5User Guide
USER
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