1
Operation
Winter conditions - i.e. CH and DHW required.
Ensure the mode knob control (A) is set to winter ( )
The boiler will re and supply heat to the radiators but will give
priority to DHW on demand.
Summer conditions - i.e. DHW only required.
Set the mode knob control to Summer ( ).
Set the CH external controls to OFF.
Note. The pump will operate briey as a self-check once every 24
hours, regardless of system demand.
Pre-heat is enabled if the pre-heat indicator (F) is lit. To switch
pre-heat on or off move the DHW/Pre-heat control knob (B) fully
clockwise and then return it to the required DHW temperature setting.
Domestic Hot Water
The DHW temperature is limited by the boiler controls to
64
o
C maximum at low draw-off rate, adjustable via the DHW
temperature control (B).
Due to system variations and seasonal temperature uctuations
DHW ow rates/temperature rise will vary, requiring adjustment
at the draw off tap : the lower the rate the higher the temperature,
and vice versa.
Central Heating
The boiler controls the central heating radiator temperature to a
maximum of 80
o
C, adjustable via the CH temperature control (C).
The boiler is a high efciency combination boiler which is most
efcient when operating in condensing mode.
The boiler will operate in this mode if the CH temperature control
(C) is set to the ‘e’ position (economy mode). This control should
be set to maximum for very cold periods.
When the Weather Compensation option is tted to the system
then the CH Temperature Control (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.
Set the mode knob control to OFF
To relight the boiler
Repeat the procedure detailed in ‘To light the boiler’.
Frost protection
If no system frost protection is provided and frost is likely during
a short absence from home, leave the heating controls (if tted)
at a reduced temperature setting. For longer periods, the entire
system should be drained.
If the system includes a frost thermostat then, during cold
weather, the boiler should be turned OFF at the time switch (if
tted) ONLY. The mains supply should be left switched ON, with
the boiler thermostat left in the normal running position.
The boiler controls will shut down the boiler in the event of
overheating. Should this occur, a fault code will be displayed.
Refer to fault chart.
Flame Failure
Should this occur a fault code will be displayed. Refer to fault chart.
Approx. ow temperatures for the boiler thermostat settings are:
Knob Setting Flow Temperature
Minimum 40
o
C (104
o
F)
Maximum 64
o
C (147
o
F)
continued . . . . . .
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