3
Alpha InTec C, X and GS
The temperature of the hot water to the taps can be adjusted by turning the hot water selector switch (item 5 in Fig. 1) to the
required value shown on the display in °C.
When a tap is opened the display will indicate the temperature of water in the boiler heating the tap water and not the actual
water temperature to the tap.
The temperature of the central heating water can be adjusted by turning the central heating selector switch (item 6 in Fig. 1).
When the heating is on the temperature of the water leaving the boiler to the radiators will be displayed.
If an external weather compensation probe is fitted, indicated by the
symbol (item 18 in Fig. 1) in the display, it will
automatically vary the temperature of the water in the radiators and on mild day the radiators will not feel as hot as on a cold
day, this is normal and not a fault with the boiler or heating circuit. The room temperature will still be maintained as set by the
room thermostat.
When an external weather probe is fitted, the central heating selector switch (item 6 in Fig. 1) will no longer adjust the flow
temperature in °C, instead the display will show a scale of 1 to 9. Each number corresponds to a line on the graph in Fig 2
i.e. line 6 will give a flow temperature of 60°C when the external temperature is 10°C.
Note:
This is the temperature of the water supplied to the radiators and not the desired room temperature. The time and
temperature will still be maintained according to the setting of the room thermostat.
3 HEATING AND HOT WATER TEMPERATURE
On -
In this mode the boiler can be switched between 'Summer' or 'Winter' settings by pressing the Summer/Winter button
(item 2 in Fig. 1).
Summer setting -
The boiler will only provide hot water when a tap is turned on and the central heating will not activate even
if requested by external controls (frost protection and pump cycle are still active).
Winter setting -
The boiler will operate in both heating and hot water. The heating will activate depending on the time and
temperature from any heating controls fitted. Hot water will always take priority over heating when a hot outlet tap is opened.
Fig. 2 - External weather compensation probe fitted
Flow temperature (°C)
External temperature (°C)
27
15
5
-5
10
0
-10
-15
20
25 (25)
60 (40)
85 (50)
Flow temperature in brackets
ie. 25 to 50°C range when boiler
is used with a low temperature
system such as under floor heating
Setting 1 to 9 as selected using
the central heating selector switch
9
8
7
6
5
4
3
2
1
0
4 FILL AND PRESSURISE THE SYSTEM
InTec C and GS models are supplied with a factory fitted filling loop located underneath the boiler, (a flexible silver coloured
braided hose).
InTec X models should have a similar style filling loop fitted by the installer located in the pipework below the boiler.
Do not attempt to fill or pressurise the system while the system is hot - wait for it to cool.
The filling loop on the underside or underneath the boiler will have two tap connections at either end of the filling loop as
shown in Fig. 3 (C model shown with factory fitted filling loop).
These taps should normally be in the closed position 90° to the tap housing.
To fill or pressurise the system open one tap fully by turning it 90° anticlockwise in line with the tap housing. The second tap
should be opened a quarter of a turn and the water will start to refill the system (water should be heard filling the system).
You should see the pressure gauge (item 7 in Fig. 1) rise back up into the green area on the pressure gauge between 1 bar
and 1.5 bar pressure.
Once the pressure gauge is in the green area turn the taps back to the off position and the water will stop filling the system.
If you happen to fill the system too much and the pressure gauge is over the green area, just bleed water from a radiator until
