3
Alpha InTec² 20SE and 30SE
Summer setting - This function can only be used if the boiler is fitted with an Alpha System kit allowing control of the
hot water cylinder using the boiler controls. This has the added advantage of allowing you to independently control the
temperature of the heating hot water and the cylinder hot water. In this mode the boiler will only supply hot water to the
cylinder when the temperature of the cylinder water is below that set by the hot water selector switch (item 5 in Fig. 1). When
heating the hot water cylinder the central heating will not function even if requested by any controls. The desired hot water
cylinder temperature can be set using the hot water selector switch.
Winter setting - In this mode the boiler will operate to requests for both heating and hot water. For a system fitted with a
standard Y or S plan the boiler should always be left in the winter mode. The boiler will always prioritise hot water when
requested by external controls. The heating will activate depending on the request from any external controls fitted. The LCD
display will then display the actual temperature of the water leaving the boiler when operating to provide heating or hot water.
Note: When using a standard Y or S plan system the central heating selector switch (item 6 in Fig. 1) must be set
above the cylinder thermostat value.
External weather compensation probe (only for use with the Alpha system diverter kit) - 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.
InTec² SE models should have a filling loop fitted by the installer located in the pipework close to the boiler.
3 HEATING AND HOT WATER TEMPERATURE
Switch the boiler on at the mains supply socket switch. The boiler will automatically go through a system purging operation
for 8 minutes; this is indicated by a count down on the display starting from 96. During this operation the pump will turn on
and off to help remove any air that may be trapped in the heating system. If the boiler has already been commissioned by the
installer then this operation can be terminated by pressing the reset button (item 3 in Fig. 1).
Note: It is important to allow this purging operation to function when the boiler has been initially installed to remove all the air
from the system.
After this purging operation the boiler will be in 'Standby' or 'On' mode.
By pressing the On-Off button (item 1 in Fig. 1) the Standby or On mode can be selected, or press and hold the On-Off
button for eight seconds to turn the boiler off.
Standby - In this mode the boiler will not provide hot water or central heating, but frost protection and pump circulation
features are still active.
Off - In this mode there is electrical power to the boiler but the boiler will not function in any condition.
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).
Press the Summer/Winter button (item 2 in Fig. 1) to select either heating and hot water or hot water only.
If an InTec² SE boiler is used with a conventional Y-plan, the boiler must be set to winter mode to provide heat to the hot
water cylinder.
Fig. 2 - External weather compensation probe fitted
Flow temperature (°C)
External temperature (°C)
27 15
5
-510 0 -10 -1520
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
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