Supplied By www.heating spares.co Tel. 0161 620 6677
How your combination boiler works
Production of hot water
This boiler is designed to give hot water at different tem-
peratures and is fitted with a temperature selector
(fig. 1 FL
To obtain the hottest water turn the selector knob fully in
the ‘+’ direction. In this position the burner may cycle high
to low flame - this is normal. Greater amounts of cooler
water can be obtained by turning the selector knob to-
wards the ‘-’ sign.
Heating
The boiler is automatically self adjusting when on central
heating. It is normal for the boiler to stay alight for exten-
ded periods with the flame height reduced.
The gas will be at high flame when the maximum output is
required, in cold weather or on start up.
Controls
Installation without a room thermostat
Set the boiler thermostat (fig. 1 B) as required depending
on the desired room temperature. To increase the heat
turn to ‘+‘, to reduce the heat turn to ‘-‘. The temperature
gauge (fig. 1 E) indicates the temperature of the water
going to the radiators.
Installation with a room thermostat
- Set the control on the room thermostat to the desired
temperature which will automatically control the firing
of the boiler to give the chosen room temperature.
- During cold weather, the boiler thermostat (fig. 1 B)
should be left on maximum, turned to position ‘+‘.
- In mild weather jt is recommended that the thermostat
is placed in an intermediate position.
To isolate the heating circuit during the summer
In some installations it is possible, after the boiler has been
operating continuously for a period providing hot water,
to get gravity circulation in the heating pipes. It will be
noticed that the pipes are getting hot and eventually the
first radiator will heat up. To avoid this, isolate as follows :
- Switch to ‘hot water only’ and close the valve (fig. 2 J) on
the heating flow.
- Do not forget to
open
the valve at the start of the hea-
ting season when the selector switch is set to ‘hot water
+ central heating’.
Pressure gauge
(fig. 1 C)
This shows the water pressure in the central heating pipe
work. When cold it should read not less than 1 bar. This will
increase as the system heats up. A pressure relief valve
will operate at 3 bar. Your installer will be able to repressu-
rise the system if necessary.
Selector switch
When set for hot water only (position
‘I’)
the boiler will only
operate on demand for hot water.
When set to hot water + central heating (position
‘II’)
the
boiler will supply your central heating requirements but
will give priority to hot water demands. The central hea-
ting supply will be temporarily interrupted when drawing
hot water but this will have no noticeable effect on the
heating levels for normal quantities of hot water supply.
lighting the boiler
I)
Switch on the electricity.
2) Turn the lever on the gas service tap to the left
(fig. 2 G).
3) Set the selector switch (fig. 1 A) to required position.
For hot water only
‘I’
or for hot water + central heating
‘II’.
The fan will start up and the pump will run if set to hot
water + central heating
‘II’.
Fig. 1
2
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