Benchmark Alpha CD18S Installation And Servicing Instructions page 17

8. Position the seal and clamp (two screws) supplied, over the bend. Fit the bend to the boiler and rotate to the correct
position and secure in position using the seal and clamp, ensuring that the seal is positioned centrally over both the bend
and adaptor.
9. Slide the clamp (three screws) over the outer duct and pull the flue assembly towards the bend, locating the inner duct into
the seal joint on the bend.
10. Secure the flue assembly to the bend with the clamp (three screws) ensuring it is positioned centrally over the joint,
ensuring the 'TOP' marked on the outer duct is positioned at the top.
Note: Check the flue terminal protrudes 100 mm out of the wall and that the inner duct of the terminal is positioned
correctly, i.e. the inner duct within the terminal is at the top. See Fig. 19.
11. Make good the outside wall by fitting a flue sealing collar onto the location provided immediately behind the flue terminal
grille. Make good the inside wall as required.
Note: If flue sealing collars are being used to make good the inside wall, then they will need to be fitted before assembling
the flue.
4.8 CONNECT THE MAINS SUPPLY - Fig. 20
1. Gain access to the boiler terminal block by releasing the two
fixing screws (one each side) securing the control panel and
lowering the panel. Refer to Technical Data, Section 2.9 for
connection details.
2. Note: This boiler has been fitted with a mains supply cable.
However, if it is necessary to fit an alternative supply cable,
ensure the cable clamp that has been fitted is removed and
connect as follows:-
Remove the two screws securing the terminal block cover
from the back of the control box (see Fig. 20). Pass the mains
supply cable through the cable clamp and connect as follows:-
Brown to L, Blue to N and Green/Yellow to
polarity.
Note: Ensure that the length of the earth wire is such that if
the supply cable is pulled out of its clamp the live and
neutral wires become taut before the earth wire.
The main terminal block can be removed by pulling it off the
pins to give easy access to the terminals.
Do not switch on the electrical supply at this stage.
Alpha CD18S/24S/30S - Installation
16
Fig. 19 - Side flue
Terminal block cover
Cable clamps
Fuse
. Ensure correct
Main terminals 3 and 4
(refer to Fig. 1b)
Remove link
to connect
external
controls
Fig. 20