Ideal Boilers LOGIC COMBI ESP1 24, Installation & Servicing

12

Installation and Servicing

SECTION 1 - GENERAL

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 

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. 

Tel. + 44 (0) 01732 351 680 

Tower House, Vale Rise 

Fax. + 44 (0) 01732 354 445 

Tonbridge. Kent TN9 1TB 

www.tfc-group.co.uk

  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.

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.

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 BS.6891.  Whilst the principle of the 
1:1 gas valve ensures the Logic range is able to deliver it is 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.

0

0.5

1

1.5

2

2.5

3

0

10

20

30

40

50

Pre

ss

ure

 d

ro

p 

 (mb

ar 

)

Heat Input to Boiler (kW)

Gas Cock Pressure Drop 

IMPORTANT.

Ensure all gas valve connections are gas tight with a gas 
soundness check up to the gas control valve.

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.  
In IE refer to I.S. 813.

The following notes are intended for general guidance:

1.

  The boiler MUST be installed so that the terminal is exposed to 

external air.

* Only one reduction down to 25mm is allowable per installation 

  otherwise BS5440-1 dimensions must be followed.

Flue Terminal Positions 

Min. Spacing*

1.

  Directly below, above or alongside an open

window, air vent or other ventilation opening. 

300mm

2. 

Below guttering, drain pipes or soil pipes. 

25mm*

BS5440-1

75mm

3.

  Below eaves. 

25mm*

BS5440-1

200mm

4. 

Below balconies or a car port roof. 

25mm*

BS5440-1 

200mm

5.

  From vertical drain pipes or soil pipes. 

25mm*

BS5440-1 

150mm

6.

  From an internal or external corner or to a  

25mm*

boundary alongside the terminal. 

BS5440-1 

300mm

7.

Above adjacent ground, roof or balcony level. 

300mm

8.

  From a surface or a boundary facing the terminal.   

600mm

9.

  From a terminal facing a terminal. 

1,200mm

10.

  From an opening in a car port 

(e.g. door or window) into dwelling. 

1,200mm

11.

  Vertically from a terminal on the same wall. 

1,500mm

12. 

Horizontally from a terminal on the wall. 

300mm

Vertical Terminals

13.

  Above the roof pitch with roof slope of all angles.   

300mm

Above flat roof. 

300mm

14.

  From a single wall face. 

300mm

From corner walls. 

300mm

15. 

Below velux window 

2000mm

16. 

Above or side of velux window 

600mm

Table 4 - Balanced Flue Terminal Position