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3.0 Operating the Boiler
6
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, or when
incomplete lighting of the burner occurs (Fig. 12).
2. Turn the selector switch fully anti-clockwise
against the spring pressure to the reset position
(
R
) 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. Your Service Engineer should
be contacted as soon as possible.
OFF
ON
PREHEAT
Domestic Hot Water
Pre-Heat Control
ON Position
Fig. 9
Central Heating
Temperature Control
Fig. 10
Reset Position
Fig. 13
30° 40° 50° 60° 70° 80°
Flame Failure
Neon
Fig. 12
OFF
ON
PREHEAT
Fig. 11
Domestic Hot Water
Pre-Heat Control
OFF Position
Domestic Hot
Water Neon