alpha InTec 12S User guide

User's

0051

Instructions

Alpha InTec 12S, 18S, 28S

Range of Wall Mounted, Fan Assisted, Room Sealed,

Gas Fired, High Efficiency Condensing System Boilers

For Technical help or for Service call ...

ALPHA HELPLINE Tel: [phone]

website: www.alpha-innovation.co.uk

Nepicar House, London Road,

Wrotham Heath, Sevenoaks,

Kent TN15 7RS

British Gas

Service Listed

For use with Natural Gas or Propane Gas (AS SUPPLIED)

Leave these instructions with the User

Please read these instructions carefully before operating your boiler.

1 INTRODUCTION

The Alpha InTec range of high efficiency condensing boilers incorporate the latest technology in boiler design. With improved
burner efficiency and reduced electrical consumption together with high quality and reliability.

The boiler output will automatically adjust according to the requirements of the system.

The InTec range are designed to work with most central heating controls however we recommend the Alpha two channel
versions of built in clock or Comfort RF external thermostat programmer.

Alternatively with the use of the Alpha system diverter kit the enhanced Alpha Climatic boiler energy manager can be used
to increase comfort and efficiency. When using the Climatic control unit the efficiency can be further enhanced with the use
of the outside sensor to enable the boiler's built in weather compensation feature.

The boilers will provide both central heating and hot water when required according to the times and temperatures set by the
controls fitted. Hot water cylinder heating will take priority over heating. Simultaneous heating and hot water can be achieved
when using a mid position Y-plan valve or S-plan system.

2 OPERATING THE BOILER

The boiler controls are located on the control panel located behind a drop down flap.

5 6

3

4

RESET

RESET

°C

bar

x100rpm

BOOST

INFO

12

1.5

1

0.5

0

CORRECT PRESSURE

WHEN COLD

721

2

2.5
3

bar

3.5

4

8 9 10

RESET

BOOST

11 12

°C

bar

x100rpm

13

14

151617181920

1 On-Off/Standby button
2 Summer/Winter button
3 Reset button
4 Information button
5* Domestic hot water temperature

selector switch

6 Central heating water temperature

selector switch
7 Heating system pressure gauge
8* DHW mode active

9 Boiler locked does not require reset via

“RESET” button

10 Flame present symbol and relative

power scale
11* Operating in summer mode
12 Operating in winter mode
13 Central heating mode active
14 Temperature indicator, boiler info and

error codes
15 Boiler in Stand-by mode

16 Presence of external connected devices
17 Solar function active
18 Functioning with external temperature

probe active (optional)

19 Boiler connected to remote control

(optional)
20 Not used on this model
21 Optional boiler controls (if fitted)

* The summer hot water mode and hot water temperature selector switch will only function when using the Alpha System Diverter kit in conjunction
with a hot water cylinder. When using a standard Y or S plan system the boiler must be left in winter mode and only the Heating thermostat used.

Fig. 1

Make sure the heating system is filled and the needle on the pressure gauge (item 7 in Fig. 1) is in the green band. If
incorrect refer to Section 4.

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.

2

Alpha InTec S

On - In this mode the boiler can be switched between 'Summer' or 'Winter' settings by pressing the Summer/Winter button

9 8

7

6

5
4

3

2

1

0

(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 InTec S boiler is used with a conventional Y-plan, the boiler must be set to winter mode to provide heat to the hot water
cylinder.

3 HEATING AND HOT WATER TEMPERATURE

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
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.

symbol (item 18 in Fig. 1) in the display, it will

85 (50)

60 (40)

25 (25)

Flow temperature (°C)

27 15

5

External temperature (°C)

-510 0 -10 -1520

Setting 1 to 9 as selected using
the central heating selector switch

Flow temperature in brackets
ie. 25 to 50°C range when boiler
is used with a low temperature
system such as under floor heating

Fig. 2 - External weather compensation probe fitted

4 FILL AND PRESSURISE THE SYSTEM

InTec S models should have a filling loop fitted by the installer located in the pipework close to 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 two tap connections at either end of the filling loop. These taps should normally be in the closed
position 90° to the tap housing.

Alpha InTec S

3