Alpha Alpha CB24, Installation And Servicing Instructions, Page: 10 / 36

10 Alpha CB24/28 - General Boiler Information/Installation
4 INSTALLATION
4.1 UNPACKING
1. The boxes required when the boiler is installed with a horizontal flue are as follows:-
Box 1 Cased boiler fitted with water and gas valves, filling loop, union bends and washers
Mounting bracket plus screws and wall plugs
Flue terminal and flue sealing collar plus 2 screws
Literature pack and Wall template
Box 2 90° flue bend (not required for vertical flue)
Box 3 0.75 m flue (for side and rear flue) with two clamps and inner duct support
Note: If an Easy flue 500 mm is ordered, this will be supplied instead of boxes 2 and 3.
2. Unpack boiler and remove the loose items packs, i.e. mounting bracket, flue terminal and collar.
Note: The boiler can be stood in an upright position supported by the bottom tray, (to allow this, the union bends have
been turned upwards so that they do not protrude beneath the bottom tray - check this before standing the boiler on the
bottom tray).
4.2 CLEARANCES REQUIRED - Fig. 8
3.9 DOMESTIC HOT WATER SYSTEM
The minimum flow rate needed for the flow switch and burner to operate is 2.0 litres/min.
The incoming mains water pressure should be between 0.2 and 8 bar to ensure efficient operation. If the pressure is above 7 bar
a pressure reducing valve must be fitted.
To ensure economic use, the pipe runs between the boiler and taps should be in 15 mm copper pipe and be as short as
possible. Where possible the pipework should be insulated to reduce heat loss.
All taps and mixing valves used with the hot water system must be suitable for operating at a mains pressure of up to 8 bar.
Showers - A shower may be used with the boiler if required.
If a loose or flexible head type shower is used it may require the fitting of a double check valve, to comply with Water Bye Law 17.
Bidets - No anti-syphonage arrangements are necessary, provided the outlets are shrouded and it is not possible to attach a
temporary hand held spray. A supply of direct mains fed hot and cold water is permitted provided the appliance is of the over-
rim flushing type.
Before the mains water supply pipe is connected to the boiler, it should be thoroughly flushed out to avoid the danger of dirt or
foreign matter entering the boiler.
The mains water supply connection to the boiler must be the first connection from the mains supply.
Seasonality valve - When this valve has been set to give the temperature of hot water required by the user, it will automatically
maintain the set hot water temperature for both summer and winter conditions by automatically changing the flow rate through
the boiler.
Fig. 8