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OPERATION MODES
Winter Conditions - (Central Heating and Domestic Hot
Water required)
If a Boiler symbol is shown on the display then press Mode
until either Ready or On is shown under the Boiler symbol. If
Tap & Radiators symbols are shown then press Mode until
Ready or On is shown under the radiator and tap symbol. [
].
The boiler will fire and supply heat to the radiators.
Summer Conditions - (Domestic Hot Water only required)
If a Boiler symbol is shown on the display then central heating
must be disabled at the timer or room thermostat. If Tap and
Radiators symbols are shown on the display then press Mode
until Ready or On is shown under the Tap and Off is shown
under the Radiator. [
].
Boiler Off
If a Boiler symbol is shown on the display then press Mode
until Off is shown under the Boiler symbol. If Tap and Radiator
symbols are shown on the display then press Mode until Off is
shown underneath the Radiator symbol.
CONTROL OF WATER TEMPERATURE
Central Heating
The boiler controls the central heating radiator temperature
o
to a maximum of 80
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 Efficient Heating System
Operation.
EFFICIENT HEATING SYSTEM OPERATION
The boiler is a high efficiency, 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 flue gases when
operating most efficiently. To operate your boiler efficiently
(using less gas) turn the temperature control knob (B) until
the leaf symbol is shown [
]. 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%.
4
WEATHER COMPENSATION
When the Weather Compensation option is fitted 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 fitted 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, with Ready or On [
under either the Boiler or Radiator symbol, 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 fitted)
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
(see section 4) 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 off.
] shown
Ready or On
User Guide
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