Benchmark Alpha CD18S Installation And Servicing Instructions page 14

4.4 FIT THE BOILER - Refer to Fig. 11
1. Lift the boiler and locate it on the mounting bracket. Fit the bottom screws to secure the boiler in position.
4.5 CONNECT THE PIPEWORK - Fig. 13
1. Thoroughly flush out all the water pipework. Refer to Section 3.9.
2. The valves/fittings have been factory fitted, however, check that all the connections underneath the boiler have been
tightened, especially the union bends.
The heating union bends have been designed to enable the heating pipes to be routed from above and/or below using the
same fitting.
Note: When soldering to the boiler union bends, ensure the bends are not connected to the valves, otherwise the internal
seals may be damaged.
3. Connect the system pipework to the boiler.
Note: 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.
4. Connect the 22 mm condensate trap drain pipe to the condensate discharge pipe.
Ensure that the condensate discharge pipe is as required in Section 3.10.
Pour at least 0.5 litre of water into the flue duct, as shown in Fig. 12, and check the condensate discharge pipe for soundness.
5. 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.
A - Heating flow (22 mm)
B - Gas inlet (22 mm)
C - Heating return (22 mm)
D - Pressure relief valve (15 mm)
E - Heating drain point
F - Condensate discharge pipe
G - Cyclone drain point
Fig. 12
Cyclone
G
Heating return
valve
Condensate
trap
70
Fig. 13
47.5
212.5
B D
Alpha CD18S/24S/30S - Installation
E
F
23
70 50
C A
13