Alpha 240eco User manual

User's
Instructions
For use with Natural Gas only
Leave these instructions with the User
Wall Mounted, Fan Assisted, Room Sealed, Gas Fired
Combination Boiler
Alpha 240eco
Alpha 240eco G.C. No. 47 532 05
Service Listed
0051
Nepicar House, London Road,
Wrotham Heath, Sevenoaks,
Kent TN15 7RS
For Technical help or for Service call ...
ALPHA HELPLINE
Tel: [phone]

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1 DESCRIPTION
The Alpha 240eco boiler is a wall mounted, fan assisted room-sealed combination boiler, providing both central heating and
domestic hot water at mains pressure.
As supplied, the boiler is suitable for central heating systems requiring between 9.3 and 23.3 kW (31 700 and 79 500 Btu/h).
After initial lighting of the boiler, it will provide central heating (as required) during the 'on' times set on your clock (if fitted). Hot
water is always available whenever a hot tap is opened.
2 USER CONTROLS
Pull the controls panel cover forward and down to gain access to the controls.
Clock
(if fitted)
System
Pressure
Gauge
Central
Heating
Thermostat
Domestic
Hot Water
Thermostat
Selector
Switch Gas Control Indicator
Neons
Pilot
Viewing
Window
0
THERMOSTAT
0
THERMOSTAT
0
SELECTOR GAS
OFF
bar
04
3
2
1
Fig. 1
1. CENTRAL HEATING THERMOSTAT
This thermostat controls the temperature of the water leaving the boiler for the heating system. For maximum output from the
radiators the thermostat should be left at maximum. If lower heating temperatures are required, turn the thermostat anti-clockwise.
2. DOMESTIC HOT WATER THERMOSTAT
This thermostat controls the temperature of the domestic hot water leaving the boiler. For maximum hot water temperatures the
thermostat should be left at maximum. If lower temperatures are required, turn the thermostat anti-clockwise.
3. SELECTOR SWITCH
This control allows the boiler to provide central heating and hot water or hot water only.
Note: The '0' (off) position must not be selected unless the boiler is turned off for long periods and the pilot is turned off (refer to
section 4). The internal clock and frost thermostat will not operate when the selector switch is in this position.
4. GAS CONTROL
This control is used for lighting and turning off the pilot.
5. PRESSURE GAUGE
This indicates the central heating system pressure. It should always be within the green band when cold, increasing slightly
when hot.
If the pressure falls below the green band, ie red area, refer to the label on the front cover for guidance on re-pressurising the
system. Or contact your Installer to have the system checked and pressurised.
3 BOILER CONTROLS

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6. INDICATOR NEONS
When illuminated, the following conditions apply:-
Warning light (continuously on) - blocked flue or fan fault, contact your Service Engineer.
Electrical supply to the boiler is on.
Boiler is supplying hot water.
Boiler is supplying central heating.
7. OVERHEAT THERMOSTAT
This thermostat automatically switches the boiler off in the unlikely event of the boiler overheating. When the thermostat
operates, it turns the pilot off. If this continually happens, contact your Service Engineer.
8. PRESSURE RELIEF VALVE
If the central heating system overheats and steam or water is discharged from the pipe connected to this valve, turn the boiler
off and contact your Service Engineer. Your Installer should have told you where this pipe terminates.
9. FROST THERMOSTAT
The boiler has a built-in frost thermostat, which automatically operates the boiler if the water temperature falls below 5°C,
providing the electrical supply neon is illuminated and the pilot is alight.
4 LIGHTING INSTRUCTIONS
Refer to Fig. 1 for boiler controls.
1. Ensure the following:-
a. Electrical supply to the boiler is off.
b. All heating controls and thermostats are set to OFF or minimum position.
c. All isolation valves at the bottom of the boiler are in the open position (flats on the spindle in line with the valves).
d. The gas and water supplies are on at the mains.
e. The heating system pressure is within the green band as shown on the pressure gauge.
2. Turn the heating and hot water thermostats fully anticlockwise to 0 and set the selector switch to 0.
3. Switch on the electrical supply to the boiler.
4. Set any room thermostats to maximum and ensure that any clock is in an 'on' position. Refer to section 8, if a clock is fitted
in the boiler control panel.
5. Set the selector switch to (hot water only). The neon will illuminate, indicating the electrical supply to the boiler is on.
6. Fully depress the gas control and keep it pressed in. After a delay of about 20 seconds the ignition sparks will start and
the pilot will light. When the pilot lights (view through the window in the boiler case) keep the control pressed in for a
further 20 seconds then release. The pilot should remain alight.
If the pilot does not remain alight, release the control and turn it off in the direction of the arrow.
Warning: If the pilot is extinguished at this or any other time, wait at least 3 minutes before attempting to relight the boiler.
7. When the pilot remains alight:-
a. Turn the hot water thermostat fully clockwise. Open a hot water tap, the main burner will light and the boiler will provide
hot water. Close the tap and the burner will go out.
b. Set the selector switch to (central heating and hot water) and turn the heating thermostat fully clockwise. The
main burner will light and the boiler will provide central heating.
8. Set the boiler and all other controls, ie room thermostat etc, to the desired positions.
To turn the central heating off i.e. in Summer:- Set the selector switch to (hot water only).
To turn the boiler off for short periods:- Set the selector switch to (hot water only).
Note: In this position the pump will automatically operate for 5 minutes in every 24 hours. If the pilot is alight and the water
temperature falls below 5°C, the built-in frost thermostat will operate the boiler automatically until the temperature of the water
in the heating system has been raised.
To turn the boiler off for longer periods:- Set the selector switch to 0 and turn the gas control in the direction of the arrow.
This will turn off the pilot. Switch off the electrical supply to the boiler. If required, all supplies i.e. gas, water and electricity may
be turned off at the mains. If there is any possibility of the boiler being left during frost conditions, then the boiler and system
should be drained and a label attached to the boiler drawing attention that the system has been drained. If this is required,
contact your Service Engineer.

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5 BOILER OPERATION
The operating sequence of the boiler is controlled by the selector switch on the control panel. With the switch set to (hot water
only) the boiler will only operate to provide domestic hot water, ideal for Summer use when central heating is not required.
Setting the selector switch to (central heating and hot water) the boiler will operate to provide both central heating and
hot water.
If the boiler is operating to provide central heating and a hot water tap is opened, the boiler will automatically switch over to
provide hot water. Such an interruption in the central heating should not be noticed by any reduction in room temperature.
Note: If a clock is fitted to the boiler, it will only control the operating times of the central heating. Hot water will always be
available when a tap is opened.
When the boiler is set to provide both central heating and hot water, it will respond to a demand for heat in the following sequence:-
The pump will start, the fan will increase to full speed and the main burner will light at full rate.
The output of the burner is automatically controlled to suit the system demand.
When the temperature of the system water in the boiler reaches that set by the thermostat or the room thermostat is satisfied,
the main burner is turned off and the fan returns to low speed. The pump will continue to run for 5 minutes to remove any
residual heat from the boiler.
When a hot tap is opened, the boiler automatically senses a flow of water. The pump will start, the fan increases to full speed
and the main burner will light.
The boiler will continue to supply hot water at the temperature set by the thermostat until the tap is closed.
Thesupplyofhotwaterisalmostinstantaneousattheboiler,butthetimetakentoreachatapandthetemperatureatwhichitleaves
the tap will depend on the rate at which the water is drawn off and the length of the pipe between the tap and the boiler.
Fullyopeningahottapmaynotprovidethemaximumtemperature,tryclosing it slightly until the maximum temperature is achieved.
Depending on the mains water pressure, it may not be possible to operate a number of hot taps at the same time.
When there is no demand for either central heating or domestic hot water, the fan runs at low speed and the pilot remains
permanently alight.
6 IMPORTANT NOTES
1. BOILER LOCATION
Always ensure the following clearances are available around the boiler:-
Top: 220 mm, Bottom: 250 mm, Each side: 5 mm, Front: 450 mm
If the boiler is installed in a cupboard or compartment, ensure that all ventilation openings are clear. Do not store any other articles
in the 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.
In cold weather, steam may be emitted from the terminal. This is 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 and the pilot should still be alight. However, check that the pilot is alight and if not, refer to the lighting instructions in
section 4. Remember to reset the clock 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
local Water Authority 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: 01322 669443 or your local Gas Region.

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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 your local Gas Region immediately.
8. ELECTRICAL SUPPLY
The boiler requires a 240 V ~ 50 Hz supply, fused at 3 A if a 13 A 3-pin plug is used or a 5 A fuse if any other type of plug is used.
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.
7 GAS SAFETY REGULATIONS
Gas Safety (Installation and Use) Regulations 1984 (as amended):-
It is the law that all gas appliances are installed and serviced by a competent person, ie CORGI 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.
8 CLOCK (if fitted)
The clock allows you to set the times at which the boiler will operate to provide central heating. It does not affect the supply
of domestic hot water, which is always available.
1. TO SET THE TIME
Turn the outer dial clockwise to set the clock hands to
the correct time.
(Ensure the time indicator corresponds with the correct
time on the 24hr dial as shown in Fig. 2,
e.g. 3.00pm = 15 not 3).
NOTE: Do not rotate the dial anti-clockwise
2. TO SET THE ON/OFF PERIODS
Select the ON times by pushing the tappets to the
outside.
Select the OFF times by pushing the tappets to the
inside.
Fig. 2 shows the clock set as follows:-
ON 3.00pm to 10.00pm (15 - 22)
OFF 10.00pm to 5.00am (22 - 5)
ON 5.00am to 8.00am (5 - 8)
OFF 8.00am to 3.00pm (8 - 15)
3. MANUAL SWITCH
The clock has a manual On/Off switch which operates as follows:-
Mid position Heating On/Off as set by the tappets
Position I(right) Heating On continuously
Position 0 (left) Heating Off continuously
Manual
On/Off switch
Time
indicator
Tappets pushed
to outside (on)
Tappets pushed
to inside (off)
O
F
F
p
e
r
i
o
d
4
3
2
1
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
3
12
9
0
I
Fig. 2