Flue Terminal Position; Vertical Balanced Flue Options; Terminal Height - Worcester 28Si Installation And Servicing Instructions

1. Flue Terminal Position

The Flue System must be installed in accordance with BS
5440: Part 1 2000 where applicable.
When installed the minimum clearance between the terminal
and any adjoining vertical walls or obstructions must be at
least 500mm.
The terminal must not be installed within 600mm of an
openable window, air vent or any other ventilation opening.
See Fig. 1.
If the flue needs to go through a wall next to the appliance
adequate space must be allowed for the flue bend to be
fitted.
When the flue is taken through the ceiling and into the roof
space, or room above there must be a minimum air gap of
25mm between any part of the flue system and any
combustion material.
Note: It is absolutely essential to ensure, that in practice,
products of combustion discharging from the flue terminal
cannot re-enter the building or any other adjacent building
through ventilators, windows, doors, other sources of natural
air infiltration, or forced ventilation/air conditioning. If this
should occur, the appliance MUST be turned off immediately
and the local Gas region called in to investigate.
The Flue System must be supported by brackets (not
supplied) such that the weight of the flue system is not
resting on the appliance flue connection.
The Flue System is suitable for installation in dwellings with
pitched or flat roofs.
The minimum distance the Flue Terminal Assembly shall
extend above the surface of the roof is 300mm. This
dimension is measured from the outside surface of a flat roof
or the highest point on a pitched roof to the underside of the
air inlet flange on the terminal assembly. See Fig 2.

2. Vertical Balanced Flue Options

Important: All the Flue items referred to in this section are
supplied as optional extras and should be purchased before
the installation is started. The components should be checked
against the parts and part numbers shown in Table 1.
Table. 1
Key No.
1
2
3
4
5
The following components MUST be ordered separately to suit the installation requirements
6 Extension Flue Kit (750mm) including Flue Spacer
7
8
*NOTE: A Vertical Flue Adaptor is supplied in the Vertical Flue Kit, and the separate Part No. should therefore only be
ordered in the case of a vertical exit from the boiler but horizontal termination
The Vertical Flue Kit consists of:-
Flue Terminal Assembly
Weather Sealing Collar
Flue Adaptor*
Fire Stop Spacer
Silicone Sealant
90° Flue Bend
45° Flue Bend
Fig. 1. Terminal Position
Pitched Roof
500
Flat Roof
500
Fig. 2. Terminal Height
300mm
minimum
Quantity
As req'd
1 pair
2
300
600
300
600
250mm
minimum
Part Number
1 7 716 191 079
1 8 716 102 321
1 7 716 191 016
2 8 716 100 281
1 ZJADH 019
7 716 191 006
1 7 716 191 013
7 716 191 014