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Alpha InTec² 25XE and 28XE 

The temperature of the hot water to the taps can be adjusted by using the hot water temperature control buttons (items 4 and 
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 using the heating temperature control buttons (items 6 and 
7 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 12 in Fig. 1) in the display, it will 

automatically vary the temperature of the water in the radiators and on a 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 sensor is fitted, the central heating temperature control buttons (items 6 and 7 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

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

E-Tec models should have a 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 will have a tap connection at either end.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 8 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 needle is over the green area, just bleed water from a 
radiator until the pressure on the gauge goes down into the green area.
It is normal for the pressure to be in the black area of the gauge when the boiler is operating

3

Alpha E-Tec 28 and 33

Summary of Contents for E-Tec 28

Page 1: ...venoaks Kent TN15 7RS For Technical help or for Service call ALPHA HELPLINE Tel 0844 871 8764 website www alpha innovation co uk Set for use with Natural Gas Leave these instructions with the User These instructions have been carefully prepared but we reserve the right to alter the specification at any time in the interest of product improvement Alpha Therm Limited 2017 ...

Page 2: ...res 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 Mode button item 1 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 c...

Page 3: ...and temperature will still be maintained according to the setting of the room thermostat 3 HEATING AND HOT WATER TEMPERATURE 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 ...

Page 4: ...tem for external condensate drainage pipework incorporating an external frost thermostat should be considered 7 GAS SAFETY REGULATIONS Current Gas Safety Installation and Use Regulations It is the law that all gas appliances are installed and serviced by a competent person i e Gas Safe registered personnel Failure to install or service appliances correctly could lead to prosecution It is in your i...

Page 5: ...lt or gas leak is suspected turn off the gas supply Do not touch any electrical switches do not smoke and extinguish all naked flames Contact the National Gas Emergency Service immediately on 0800 111 999 8 ELECTRICAL SUPPLY The boiler requires a 230 240 V 50 Hz supply fused at 3 A To connect a plug The colour of the wires in the mains lead of the boiler may not correspond with the coloured markin...

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