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3.0 Operating the Boiler
7
3.2 Temperature Control
1. Central Heating: The central heating hot water flow
temperature can be adjusted between 30° C (± 5° C)
minimum and 85° C (± 5° C) maximum.
2. Turn the control knob clockwise to increase the
temperature (Fig. 9).
3. In normal winter usage we recommend that the
central heating temperature be set at maximum.
4.
Domestic Hot Water Pre-Heat: To enjoy optimum
performance of the boiler the pre-heat control should
be set fully clockwise to the ON position (Fig. 10).
When there is a demand for hot water it will be supplied
at approximately 65° C instantaneously.
5. Turning the control 15° clockwise from the OFF
position will activate the pre-heat feature. Hot water will
be supplied at approximately 35° C instantaneously.
6. To increase the temperature turn the control further
clockwise. For example, when set 90° clockwise the
boiler will supply hot water at approximately 44° C
instantaneously. At a position 180° from clockwise (i.e.
straight down) the hot water will be supplied at 52° C
instantaneously.
7. When the control is set anywhere between 15°
clockwise from the OFF position and the ON position,
the pre-heat feature will operate.
8. With the control in the OFF position (Fig. 11) the pre-
heat feature will not operate. Hot water will be supplied
at approximately 50° C.
9. The pre-heat feature will function with the selector
switch in either operating position. This is indicated by
the domestic hot water mode neon flashing (Fig. 12).
10. The flow rate can be reduced down to as low as 2.5
litre/min. The boiler will still recognise the need to heat
the water.
3.3 Flame Failure Reset
1. The red flame failure neon ( ) will illuminate in the
event of the burner failing to light, when incomplete
lighting of the burner occurs or blockage of the
condensate drain (Fig. 12).
2. Turn the selector switch fully anti-clockwise against
the spring pressure to the ‘Reset’ position for at least
two seconds and release (Fig. 13). Set the selector to the
required position to light the boiler.
3. If the flame failure light illuminates repeatedly a fault is
indicated with either the boiler, the gas supply or the
condensate drain. Your Installer or Service Engineer
should be called as soon as possible.
OFF
ON
PREHEAT
Reset
Domestic Hot Water
Pre-Heat Control
ON Position
Fig. 9
Central Heating
Temperature Control
Fig. 10
Reset Position
Fig. 13
30
o
40
o
50
o
60
o
70
o
80
o
Flame Failure
Neon
Fig. 12
OFF
ON
PREHEAT
Fig. 11
Domestic Hot Water
Pre-Heat Control
OFF Position
Domestic Hot
Water Neon