Technical information

Installation and servicing instructions strictly reserved
for qualified gas installers
21
4.17 Filling a Sealed Water System
Provision for filling the system at low level must
be made, see diagram 4.4. There must be no
permanent connection to the mains water supply,
even through a non-return valve.
Diagram 4.4
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5 INSTALLATION PREPARATION
5.1 Appliance Pack
IMPORTANT: With regards to the Health and
Safety Manual Handling requirements, two
persons shall be required to lift the appliance,
refer to manual handling on page 5.
NOTE: The fittings pack is located in the base
polystyrene packing under the boiler base.
Remove the polystyrene end packing pieces then
carefully lay the boiler on its back, remove the two
front casing panel securing screws and lift off the
panel from two retaining lugs, see diagram 5.1.
Remove the transit packaging behind the front
panel and discard.
Carefully place front panel and screws to one
side.
5.2 Wall Template
Remove the wall template from the documentation
pack and place in the desired position on a flat wall,
giving due consideration to boiler clearances, see
Section 2.2, and the flue you are fitting.
5.3 Flue Hole Cutting
The standard horizontal flues are designed with
an internal fall of 35mm/metre towards the boiler
for disposal of condensate. If the standard flue
length alone is being used then the flue hole of
diameter 105mm can be cut in the position marked
on the wall template.
For standard side flues the horizontal flue centre
line on the wall template should be extended to the
side wall, and the vertical centre of the flue hole
marked at 176mm from the back wall.
For installations with external access, a 105mm
diameter core drill can be used.
For installations with internal access only a 125mm
diameter core drill should be used.
When using extension pipes with the horizontal
rear flue, a core drill size of 125mm should be
used to allow the extension pieces to slope at
44mm/metre (2.5°) towards the boiler.