Gas Supply; Flue Installation; Balanced Flue Terminal Position - IDEAL istor HE260 Installation And Servicing

GAS SUPPLY

The local gas supplier should be consulted, at the installation
planning stage, in order to establish the availability of an
adequate supply of gas. An existing service pipe must NOT be
used without prior consultation with the local gas supplier.
The boiler MUST be installed on a gas supply with a governed
meter only.
A gas meter can only be connected by the local gas supplier or
by a Gas Safe Registered Engineer. In IE by a Registered Gas
Installer (RGII).
An existing meter should be checked, preferably by the gas
supplier, to ensure that the meter is adequate to deal with the
rate of gas supply required.
It is the responsibility of the Gas Installer to size the gas
installation pipework in accordance with BS6891:2005. Whilst
the principle of the 1:1 gas valve ensures the istor range is
able to deliver it's full output at inlet pressures as low as
14mb, other gas appliances in the property may not be as
tolerant. When operating pressures are found to be below the
minimum meter outlet of 19mb these should be checked to
ensure this is adequate for correct and safe operation.
Allowing for the acceptable pressure loss of 1mb across the
installation pipework, it can be assumed that a minimum
permitted operating pressure of 18mb will be delivered to the
inlet of the appliance. (Reference BS 6400-1 Clause 6.2
Pressure Absorption).
The integral appliance isolation valve and boiler pipework
could further reduce the operating pressure by up to 1.5mb
when measured at the inlet test point on the appliance gas
valve. Therefore it has been identified that an operating
pressure as low as 16.5mbar could be measured at the
appliance inlet pressure test point on the gas valve.
IMPORTANT.
Installation pipes must be fitted in accordance with BS.6891.
In IE refer to IS.813:2002. Pipework from the meter to the boiler
MUST be of an adequate size.
The complete installation MUST be tested for gas tightness
and purged as described in the above code.

FLUE INSTALLATION

Pluming will occur at the terminal so terminal positions where
this could cause a nuisance should be avoided.
The flue must be installed in accordance with the
recommendations of BS. 5440-1: 2000. In IE refer to I.S.
813:2002.
Do not use pipes of a smaller size than the boiler inlet gas
connection.
The following notes are intended for general guidance:
1. The boiler MUST be installed so that the terminal is
exposed to external air.
2. It is important that the position of the terminal allows the
free passage of air across it at all times.
3. Minimum acceptable spacing from the terminal to
obstructions and ventilation openings are specified in Table 4.
4. Where the lowest part of the terminal is fitted less than 2m
(6'6") above a balcony, above ground or above a flat roof to
which people have access then the terminal MUST be
protected by a purpose designed guard.
Terminals guards are available from boiler suppliers. In
case of difficulty seek advice from:
Grasslin (UK) Ltd.,
Tower House, Vale Rise, Tonbridge, Kent TN9 1TB
Tel. +44 (0)1732 359888 / Fax. +44 (0) 1732 354445
www.tfc-group.co.uk
Ensure that the guard is fitted centrally.
istor system store condensing -
GENERAL
Installation and Servicing
Table 4 - Balanced Flue Terminal Position
Flue Terminal Positions
1. Directly below or alongside an opening
window, air vent or other ventilation opening.
2. Below guttering, drain pipes or soil pipes.
3. Below eaves.
4. Below balconies or a car port roof.
5. From vertical drain pipes or soil pipes.
6. From an internal or external corner or to a
boundary along side the terminal.
7. Above adjacent ground, roof or balcony level.
8. From a surface or a boundary facing the terminal.
9. From a terminal facing a terminal.
10. From an opening in a car port
(e.g. door or window) into dwelling.
11. Vertically from a terminal on the same wall.
12. Horizontally from a terminal on the wall.
Vertical Terminals
13. Above the roof pitch with roof slope of all angles.
Above flat roof.
14. From a single wall face.
From corner walls
15. Below velux window
16. Above or side of velux window
* Only one reduction down to 25mm is allowable per installation
otherwise BS5440-1 2000 dimensions must be followed.
For RH Side Flues
- If the appliance is installed at minimum clearance from a
standard cavity wall the horizontal flue kit (600mm long) is
required.
- If the telescopic flue kit is used, an additional 'D' Pack
Extension will be needed.
For LH Side and Rear Flues
- For minimum clearance from standard cavity wall the
telescopic flue kit only is required.
5. Where the terminal is fitted within 850mm (34") of a
plastic or painted gutter or 450mm (18") of painted eaves
then an aluminium shield at least 750mm (30") long
should be fitted to the underside of the gutter or painted
surface fitted centrally above the flue.
6. The air inlet/products outlet duct and the terminal of the
boiler MUST NOT be closer than 25mm (1") to
combustible material. Detailed recommendations on the
protection of combustible material are given in BS. 5440:
Part 1, 2000. In IE refer to IS 813:2002.
IMPORTANT. It is absolutely essential to ensure, in practice,
that products of combustion discharging from the 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,
labelled as 'unsafe' until corrective action can be taken.
Min. Spacing*
300mm (12")
25mm ( 1")*
BS5440-1 2000 75mm (3")
25mm (1")*
BS5440-1 2000 200mm (8")
25mm (1")*
BS5440-1 2000 200mm (8")
25mm (1")*
BS5440-1 2000 150mm (6")
25mm (1")*
BS5440-1 2000 300mm (12")
300mm (12")
600mm (24")
1,200mm (48")
1,200mm (48")
1,500mm (60")
300mm (12")
300mm (12")
300mm (12")
300mm (12")
300mm (12")
2000mm (79")
600mm (24")
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