Temperature Control; Safety Thermostats - Baxi COMBI 105 HE User Operating Instructions Manual

Fig. 9
Central Heating

Temperature Control

Fig. 10
Domestic Hot Water
Temperature Control
Flame Failure
Safety Thermostat
Neon Neon
o o o o o o
30 40 50 60 70 80
Fig. 11
Reset
Reset Position
Fig. 12
© Baxi Heating UK Ltd 2007
3.0 Operating the Boiler
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: The temperature of the
domestic hot water can be adjusted by turning the
control knob clockwise to increase up to a maximum of
65° C (Fig. 10).
5. The temperature of the water is also dependent on
the water flow rate and the temperature of the mains
coming into the house.
6. By slightly reducing the flow from the tap the
temperature will increase up to the maximum if
required.
7. 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 (
the event of the burner failing to light, when incomplete
lighting of the burner occurs or blockage of the
condensate drain (Fig. 11).
2. Turn the selector switch fully anti-clockwise against
the spring pressure to the 'Reset' position for at least
two seconds and release (Fig. 12). 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 contacted as soon as possible.
3.4

Safety Thermostats

1. Your Baxi Combi 105 HE is fitted with additional
safety devices, which shut down the boiler in the event
of the system, the boiler or the flue overheating. The
safety thermostat neon ( ) will light in this instance
(Fig. 11).
2. To reset: Turn the selector fully anti-clockwise against
the spring pressure to the 'Reset' position for at least
two seconds and release (Fig. 12). Set the selector to
the required position to light the boiler.
3. If after turning the selector to the 'Reset' position the
boiler does not relight or the safety thermostat operates
repeatedly, causing boiler shutdown, a fault is indicated.
Your Installer or Service Engineer should be contacted
as soon as possible.
) will illuminate in
7