Gas Supply; Flue Installation - IDEAL LOGIC CODE COMBI ESP1 26 Installation And Servicing

1.8 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 Logic range is
able to deliver its 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 external gas cock could further reduce the operating
pressure when measured at its test point. The pressure drop is
relative to the heat input to the boiler (kW), refer to graph below.
Gas Cock Pressure Drop
3
2.5
2
1.5
1
0.5
0
0 10
IMPORTANT.
Installation pipes must be fitted in accordance with BS.6891. In
IE refer to IS.813:2002.
The complete installation MUST be tested for gas tightness and
purged as described in the above code.

1.9 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: 2008.
In IE refer to I.S. 813:2002.
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.
12
SECTION 1 - GENERAL
20 30 40
Heat Input to Boiler (kW)
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
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.
Terminal guards are available from boiler suppliers. (Ask
for TFC flue guard model no. K6 - round, plastic coated). In
case of difficulty contact:
TFC Group.
Tower House, Vale Rise
Tonbridge. Kent TN9 1TB
Ensure that the guard is fitted centrally.
5. The flue assembly shall be so placed or shielded as to
prevent ignition or damage to any part of any building.
6. The air inlet/products outlet duct and the terminal of the
boiler MUST NOT be closer than 25mm to combustible
material. Detailed recommendations on the protection of
combustible material are given in BS. 5440-1:2008.
IMPORTANT. It is essential to ensure, in practice, that products
of combustion discharging from the terminal cannot re-enter the
building or buildings through any openings into the building such
as ventilators, windows, doors, or other sources of natural air
infiltration, such as forced ventilation openings etc.
If products of combustion re-entry is identified or suspected this
should be immediately investigated and corrected following the
guidance provided in the current Gas Industry Unsafe Situation
Procedure.
Table 4 - Balanced Flue Terminal Position
Flue Terminal Positions
1. Directly below, above 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
50
boundary alongside 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.
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 2008 dimensions must be followed.
Tel. + 44 (0) 01732 351 680
Fax. + 44 (0) 01732 354 445
www.tfc-group.co.uk
Min. Spacing*
BS5440-1 2008
BS5440-1 2008
BS5440-1 2008
BS5440-1 2008
BS5440-1 2008
Vertical Terminals
Installation and Servicing
300mm
25mm*
75mm
25mm*
200mm
25mm*
200mm
25mm*
150mm
25mm*
300mm
300mm
600mm
1,200mm
1,200mm
1,500mm
300mm
300mm
300mm
300mm
300mm
2000mm
600mm