Technical data

13
Alpha 500E - Installation
4.4 FIT THE BOILER - Refer to Fig. 11
1. Lift the boiler and locate it on the mounting bracket.
2. Adjust the position of the boiler, as necessary. Fit the bottom screws to secure the boiler in position.
4.5 FIT THE UNVENTED KIT (BOX 4) - Fig 12
1. Unpack Box 4 and check the contents.
2. Locate the expansion vessel mounting bracket in a suitable position as close to the boiler as possible and secure in
position with the screws and wall plugs provided.
3. Secure the expansion vessel to the mounting bracket using the metal band, nut, washers and bolt.
4. Connect the expansion relief valve to the expansion vessel as shown in Fig. 12.
Notes: 1. The plug must be removed from the capped connection on the expansion vessel relief valve to enable
connection to the expansion vessel.
2. Mount the valve in either the horizontal or vertical orientation. An inverted orientation may allow debris deposits
onto the valve seating and cause the valve to malfunction.
3. Ensure the valve is mounted correctly, i.e. the arrow marking on the valve body is pointing in the direction of flow.
5. Connect the mains water supply to the pressure reducing valve and thoroughly flush out the water pipework.
Refer to Domestic Hot Water System, section 3.9.
4.6 CONNECT THE PIPEWORK - Fig. 13
1. Thoroughly flush out all the water pipework.
Ensure that all the plastic caps are removed from the boiler connections.
2. Secure all the valves/fittings to the boiler- use the washers supplied, ensuring they are facing the rear wall. Fit the union
bends to the valves.
Note: If soldering to the boiler union bends, ensure that the bends are not connected to the valves, otherwise the internal
seals may be damaged.
3. Connect the pipework from the boiler to the unvented kit.
Note: No valves must be fitted between the boiler and the unvented kit.
4. Connect the system pipework to the boiler and the discharge pipe to the heating system pressure relief valve.
Do not forget that the pressure relief valve discharge pipe must be routed clear of the boiler to a drain in such a manner
that it may be seen, but cannot cause injury to persons or property.
5. Connect the discharge pipework to the temperature/pressure relief and expansion relief valves via the tundish supplied.
This pipework must be installed as recommended in Unvented Hot Water Storage System, section 3.10.
6. Ensure that all the valves are closed (spindle flats at right angles to valve) and do not turn on the water or gas supplies at
this stage.
DHW expansion vessel
Pressure reducing valve
(incorporating filter)
Mounting bracket
Expansion relief valve
(incorporating check valve)
Discharge pipe
To boiler
Mains water
supply
Cold water
supply
Fig. 12