Installation Manual
Wall Hung Boiler with D.H.W. Storage Cylinder Low Nox – Cod. 99881NA – July 2001
7
Where installation will be in an unusual location, special procedures may be necessary. BS 6798 gives detailed guidance on
this aspect.
For clearances to be made available for installation and servicing, see Sections 5.2.2. to 5.2.4.
FLUE POSITION
IMPORTANT: THE FLUE SYSTEM SHALL BE INSTALLED IN ACCORDANCE WITH THE RECOMMENDATIONS
CONTAINED IN BS 5440:1.
The boiler MUST be installed so that the terminal is exposed to the external air.
It is important that the position of the terminal allows free passage of air across it at all times.
If the terminal discharges into a pathway or passageway check that combustion products will not cause nuisance and that the
terminal will not obstruct the passageway.
In certain weather conditions a terminal may emit a plume of steam. Positions where this would cause a nuisance should be
avoided.
IMPORTANT REQUIREMENT: The correct dimensional relationship between the terminal and any obstruction, openable
window or ventilator as shown in Fig 1 pag.7 It is 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 systems. If this should occur, the appliance MUST
BE TURNED OFF IMMEDIATELY and the local gas region consulted.
Where the lowest part of the terminal is fitted less than 2m (6.6ft) above a balcony, above ground, or above a flat roof to which
people have access, the terminal MUST be protected by a purpose designed guard.
Where the terminal is fitted within 850mm (34in) of a plastic or painted gutter, or 450mm (18in) of painted eaves, an aluminium
shield of at least 1500mm (59in) long should be fitted to the underside of the gutter painted surface.
The air inlet/products outlet duct and the terminal of the boiler MUST NOT be closer than 25mm (1in) to combustible material.
TERMINAL POSITION
A
Directly below an openable window, air vent
300 mm (12in)
or any other ventilation opening
B
Below guttering, drain pipes or soil pipes
75 mm (3in)
C/D
Below eaves, balconies or carport roof
200 mm (8in)
E
From vertical drain pipes or soil pipes
75 mm (3in)
F
From internal or external corners
300 mm (12in)
G
Above adjacent ground, roof or balcony level
300 mm (12in)
H
From a surface facing the terminal
600 mm (24in)
I
From a terminal facing the terminal
1200 mm (48in)
J
From an opening in the carport (eg door, window)
1200 mm (48in)
into the dwelling
K
Vertically from a terminal on the same wall
1500 mm (60in)
L
Horizontally from a terminal on the same wall
300 mm (12in)
M
Adjacent to opening
300 mm
Under carport with open sides
Fig. 1
Summary of Contents for RMA
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