Technical data

11
Alpha 240XP and 240XE - 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
Water and gas valves plus washers
Water fittings
Mounting bracket plus screws and wall plugs
Flue terminal plus 2 screws
Literature pack and Wall template
Box 2 90° flue bend with clamp (not required for vertical flue)
Box 3 0.75 m flue (for side and rear flue) with two clamps and inner duct support
2. Unpack boiler and remove loose items packs.
3. Remove the two screws at the top of the front casing. Slide it up and lift it off.
4.2 CLEARANCES REQUIRED - Fig. 9
3.9 DOMESTIC HOT WATER SYSTEM
The minimum flow rate needed for the flow switch and burner to operate is 2.5 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.
Note: The boiler has been provided with the facility for fitting an expansion device, i.e. shock arrestor or expansion vessel in
the DHW circuit (see Fig. 35). An optional kit is available from Alpha Therm Ltd., Goldsel Road, Swanley, Kent BR8 8EX.
If the mains water supply has been fitted with check valves, water meter or a loose jumper stop cock, then an expansion device
must be fitted.
Fig. 9
360 mm
900 mm
Minimum
clearance
of 450 mm
from front
of boiler
220 mm
450 mm
250 mm
5 mm
Minimum
clearances
5 mm