Alpha 280E User manual

Installation Instructions
These instructions must be read in conjunction with the Installation instructions supplied with the boiler.
Only flue components supplied by Alpha may be used with Alpha boilers, failure to comply will invalidate
the boiler's warranty and CE approval, and may be unsafe.
0051
Suitable for use with the
Alpha 240, 280 and 500 Range of gas fired
combination boilers
Alpha Twin Pipe Flue Systems
Nepicar House, London Road,
Wrotham Heath, Sevenoaks,
Kent TN15 7RS
For Technical help or for Service call ...
ALPHA HELPLINE
Tel: [phone]

2Twin Pipe Flue Systems
1 COMPONENTS AVAILABLETO ORDER
Air duct
adaptor
Flue duct
adaptor
Clamp
Seal
Conversion Kit - 1000368
1000 mm Flue/Air Duct (80 mm) - 1000365
Vertical Terminal (80 mm) - 1000369
Ridge Tile Kit (80 mm) - 1000374
Horizontal Terminal (80 mm) - 1000370
90° Bend (80 mm) - 1000366 45° Bend (80 mm) - 1000367
1. The flue system must be installed in accordance with BS 5440:1.
2. The boiler must be installed in accordance with the Installation and Servicing instructions supplied with the boiler.
3. The maximum equivalent flue lengths are as given below. (Refer to illustrations in section 3).
Alpha Boiler
Horizontal Flue
Vertical Flue (Inc. Terminal)
500E & 240 Range
10 m
7 m
280E
6 m
7 m
Note: i) Ensure the flue length does not exceed the equivalent shown in the table above.
ii) Alpha 500E - Remove the air restrictor when the flue length is more than 6 m.
4. Each 90° Bend (80 mm) is equivalent to 0.50 m of flue length.
Each 45° Bend (80 mm) is equivalent to 0.25 m of flue length.
Note: A 90° bend must not be used with a vertical flue.
5. Refer to the flue options shown to determine the equivalent length of flue pipe required. Ensure that this does not exceed
the maximum equivalent flue length given in the table above.
6. The vertical flue terminal is equivalent to 1 m of flue length and must be positioned above the roof line as shown in Fig. 3.
7. If a bend is to be fitted directly to the boiler, a clearance of 230 mm is required above the boiler.
8. Refer to the Installation and Servicing instructions supplied with the boiler for details of permissible flue terminal positions
9. For horixontal flues ensure there is a slight downward slope towards the terminal and there is no part of the flue system where
condensate will collect.
10. All parts of the exhaust flue duct must be at least 25 mm from any combustible material. When passing through a wall,
floor or roof, the flue duct must be separated from any combustible material or plastic by a non-combustible sleeve
providing a circular air space of at least 25 mm around the flue duct.
11. Any portion of the flue duct which could be touched must be encased or shielded to prevent access. This does not apply
to the air inlet duct.
2 INTRODUCTION

3
Twin Pipe Flue Systems
3 FLUE OPTIONS
3.1 HORIZONTAL FLUE OPTIONS - Lmax = 10 m (except Alpha 280E where Lmax = 6 m)
L = Equivalent length of flue or air duct (a 90° bend is equivalent to 0.50 m of flue length and a 45° bend is equivalent to 0.25 m
of flue length).
A = Total length of flue/air ducting required.
Fig. 1
Where D = 50 mm for each connection in straight ducting
Lmax = 10 m (except for Alpha 280E - Lmax = 6 m)
A = (2 x B) + C1 + C2 + D + 220 mm
Alpha 500E A = (2 x B) + D + 570 mm
B
Alpha 240/280 Range A = (2 x B) + D + 510 mm
B
B
L
C2
C1
REAR FLUESIDE FLUE
Fig. 2
B2
L
L
C1
C2
B1
Note: Ensure
there is an adequate
and permanent
air supply.
(Refer to BS 5440:1)
A = (B1 + C1) + (B2 + C2) + D + 60 mm
Where D = 50 mm for each connection in straight ducting
Lmax = 10 m (except for Alpha 280E - Lmax = 6 m)

4Twin Pipe Flue Systems
3.2 VERTICAL FLUE OPTION - Flat or pitched roof
The vertical flue terminal is equivalent to 1 m of flue length.
Note: A 90°bend must not be used with a vertical flue.
Fig. 4
3.3 VERTICAL FLUE OPTION - Ridge tile
Fig. 3
A = 2 x C + (50 mm for each connection in straight ducting)
Hmax = 7 m
Not less than
450 mm
Not less than
300 mm
H
C
Not less than
450 mm
Not less than
300 mm
H
C
Hmax = 6.5 m
A = H + (C + B + 10 mm) + (50 mm for each connection in straight ducting)
H
C
L
B
Hmax = 7 m
Lmax = 10 m
(except for Alpha 280E - Lmax = 6 m)

5
Twin Pipe Flue Systems
4 INSTALLATION
4.1 INSTALL THE BOILER
Mount the boiler on the wall and connect the pipework as described in the Installation and Servicing instructions supplied with
the boiler.
4.2 CONVERT THE BOILER (see Fig. 5)
Modify the top of the boiler to enable a 2-pipe flue system to be connected using conversion kit 1000368 as follows:-
1. Place the flue duct adaptor in position onto the boiler flue adaptor and secure with the clamp and seal.
2. Select the required position of the air duct adaptor and remove the three screws securing the cover plate.
3. Using the same three screws and gasket secure the air duct adaptor in position.
Fig. 6
Fig. 5
40 90
Air duct adaptor
Flue duct adaptor
Boiler flue adaptor
Clamp and seal
Top of boiler
Cover plates
Alpha 240 Range, 280E
Alpha 500E
190
145
90
160
75
280
425 175
160
280
225 225
175 55
120120
135
Air duct adaptor
may be fitted right
or left side