Alpha E-Tec 28 User manual

User
Instructions
E-Tec 28 and 33
Wall Mounted, Fan Assisted, Room Sealed,
Gas Fired, High Efficiency Condensing Combination Boiler
Nepicar House, London Road,
Wrotham Heath, Sevenoaks,
Kent TN15 7RS
For Technical help or for Service call ...
ALPHA HELPLINE Tel: [phone]
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.

2Alpha E-Tec 28 and 33
Please read these instructions carefully before operating your boiler.
The Alpha E-Tec 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 E-Tec range are designed to work with most central heating controls however we recommend the Alpha Comfort or
Easy-Stat standard controls or the enhanced Alpha Climatic boiler energy manager further improving the system efficiency
by varying the system temperature depending on the room temperature and heat losses.
In addition all E-Tec models feature optional connections for an outside sensor to enable the boilers built in weather
compensation feature.
The boilers will provide central heating when required during the on times as set according to the controls fitted. Hot water
will always take priority over the central heating whenever a hot tap is opened.
Fig. 1
2 OPERATING THE BOILER
1 INTRODUCTION
Switch the boiler on at the mains supply socket switch. The boiler will be in either 'Standby' or 'On' mode.
By pressing the Mode button (item 1 in Fig. 1) the Standby or On mode can be selected, or press and hold the Mode 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 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 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.
The boiler controls are located on the control panel.Make sure the heating system is filled and the needle on the pressure
gauge (item 8 in Fig. 1) is in the green band when cold. If incorrect refer to Section 4.
1 - Off/Stand-by/Summer/Winter button
2 - Information button
3 - Reset Button
4 - Reduce DHW set temperature
5 - Increase DHW set temperature
6 - Increase heating system set temperature
7 - Reduce heating system set temperature
8 - Heating system pressure gauge
9 - Domestic hot water active
10 - Remote Climatic controller fitted
11 - Boiler fired and power level
12 - External weather probe fitted
13 - Active solar supply (pre-heated inlet)
14 - Central heating active
15 - Central heating temperature indicator
16 - Boiler in Stand-by mode
17 - Winter mode – heating and hot water
18 - Summer mode – DHW only
19 - Temperature/info/code - display
20 - Not used on this model
21 - Boiler locked - reset required
22 - DHW temperature indicator
456
78
12
3
RESET BOOST
°C
RESET BOOST
°C
91011 12 13
14
15
16
17
1819202122
RESET INFO

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 5-510 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
98 765
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

4Alpha E-Tec 28 and 33
The boiler has a built in frost protection function to protect the boiler (only) from freezing. If water within the boiler falls below
4°C the boiler will fire in heating mode and raise the temperature of the heating water (in the boiler only) to 30°C.
For this function to be active the gas and electricity supplies to the boiler must be turned on and the boiler be in either
'Standby' or 'On' mode.
Further protection for the mains water supply and heating circuit must be provided separately.
If Alpha external controls are fitted, a frost protection setting is incorporated into the room thermostat activating the central
heating when the temperature falls below 5°C.
5 FROST PROTECTION
6 CONDENSATE DRAINAGE
High efficiency (condensing) boilers remove more useful heat from the combustion gases, resulting in additional water vapour
which is collected within the boiler (as condensate) and run to a suitable drainage point via the condensate drainage pipe.
Where possible the condensate drain should be connected internally to a waste pipe within the property to prevent the risk of
freezing.
If the condensate drain pipe runs outside it should be fitted with increased diameter pipe and be suitably lagged to reduce
the risk from freezing.
In situations where there are likely to be extremes of temperature or wind-chill the use of a proprietary trace-heating system
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 interest and that of safety to ensure
compliance with the law. The manufacturer's instructions must not be taken in any way as over-riding statutory obligations.
The Benchmark Checklist must be fully completed by the installer on installation of the boiler. The Benchmark Checklist is
shown in back of the Installation and Servicing instructions. All Gas Safe registered installers carry a Gas Safe ID card and
have a registration number. Both should be recorded in the Checklist. You can check your installer is Gas Safe registered by
calling Gas Safe on 0800 408 5500.
It is a requirement that the boiler is installed and commissioned to the manufacturers instructions and the data fields on the
commissioning checklist completed in full.
To instigate the boiler guarantee the boiler needs to be registered with the manufacturer within one month of the installation.
To maintain the boiler guarantee it is essential that the boiler is serviced annually by a Gas Safe registered engineer who has
been trained on the boiler installed. The service details should be recorded on the Benchmark Service Interval Record and
left with the householder.
8 BENCHMARK COMMISSIONING and SERVICING

5
Alpha E-Tec 28 and 33
1. BOILER LOCATION
Always ensure the following clearances are available around the casing of the boiler:-
Top: (horizontal flue) 235 mm, Top: (vertical flue) 150 mm, Bottom: 150 mm, Each side: 5 mm, Front: 450 mm
Do not store any other articles in a cupboard containing the boiler and never place any clothing or combustible material on or
near the boiler or flue pipe.
2. FLUE TERMINAL
The terminal on the outside wall must not be allowed to be obstructed. If it is damaged, in any way, turn the boiler off and
contact your Service Engineer.
Note: The Alpha E-Tec boiler is a high efficiency condensing boiler and when operating vapour will be emitted from the
terminal. This is safe and quite normal.
3. MAINS FAILURE
In the event of an electrical supply failure the boiler will not operate. When the supply is restored, the boiler will return to
normal operation. Remember to reset any controls, if fitted, when the supply is restored.
If the mains water supply fails, there will be no hot water from the taps. The boiler will continue to provide central heating.
4. ADDITIONAL BATHROOM FITTINGS
Any equipment such as mixing valves, showers, bidets etc. must be designed to operate at mains water pressure. Contact
your plumbing merchant or installer for advice when considering purchasing such items.
5. CLEANING
Use only a damp cloth and mild detergent to clean the boiler outer casing. Do not use abrasive cleaners.
6. SERVICING
To maintain efficient and safe operation of your boiler, routine annual servicing is essential.
For advice on servicing contact:- The Alpha Helpline: 0844 871 8764.
7. GAS LEAK
If a fault 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 markings identifying the
terminals in your plug. In this case proceed as follows:-
The wire coloured green and yellow must be connected to the terminal in the plug that is marked with the letter E, or by the
earth symbol , or coloured green or green and yellow.
The blue wire must be connected to the terminal which is marked with either the letter Nor coloured black.
The brown wire must be connected to the terminal which is marked with the letter Lor coloured red.
THE APPLIANCE MUST BE EARTHED.
9 IMPORTANT NOTES
10 OPTIONAL BOILER CONTROLS (if fitted)
There is a range of controls available from Alpha to operate your boiler. In addition to the items listed below the Alpha E-Tec
boilers are compatible with most controls available on the market. However to get the most comfort and efficiency from your
boiler we recommend the Alpha Climatic controls with enhanced remote boiler functions and efficiency control.
Please refer to the instructions provided with the controls for further information on their setting and use.
Available Alpha controls:
Alpha Easy-Stat wireless programmable room thermostat ........................................................................Part No. 7.2000050
24hr mechanical heating clock (boiler mounted)........................................................................................Part No. 6.1000201
Alpha Climatic wired programmable boiler energy manager .....................................................................Part No. 3.022144
Alpha Climatic wireless programmable boiler energy manager (boiler mounted receiver).........................Part No. 3.022143
External weather compensation probe.......................................................................................................Part No. 3.022383