IMPORTANT NOTE: It is the responsibility of the installer 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 inltration, or forced ventilation / air conditioning.
If this should occur the appliance MUST be isolated from the gas supply and labelled as ‘unsafe’ until corrective
action can be taken.
Terminal Position
Due to the high efciency of the boilers pluming will occur.
Particular care should be taken in the case of large output boiler installations, and ensuring that
in the UK they comply with the requirements of the Clean Air Act.
The ue must be installed in accordance with the appropriate Building Regulations and standards
listed on page 4 and in compliance with BS6644. In IE refer to I.S.820:2000.
2.14
FLUE INSTALLATION
2.14.1
FLUE SYSTEM DESIGN
Due to the high efciency of these boilers, the ue gas temperatures are low and the buoyancy in
the stack will be relatively small. The boiler is supplied with an integral fan which is fully matched
to the boiler in each case to provide correct combustion air ow and overcome the ue resistance.
The power of this fan is such that there is a large reserve of pressure available to overcome a
signicant length of ue without affecting the combustion performance of the boiler.
The maximum pressure available at the base of the ue to overcome ue resistance is 2.5 mbar
(250 Pa.) This gure should be reduced to 2 mbar (200 Pa) if the boiler is to be room sealed and
incorporates a combustion air inlet duct. Care should be taken with tall ue systems to ensure
excess buoyancy is not created. A negative pressure must not be created at the boiler ue outlet.
Refer to the tabulated data at the end of this section for ue and duct pressure losses.
IMPORTANT NOTE: If combustion air is drawn from within the boiler room, ensure no dust or airborne debris can
be ingested into the appliance. Dusty concrete ooring should be sealed to reduce the presence of dust. Ideally
where possible duct the air supply into the boiler room from a clean source outside the boiler room / building.
Material
With no requirement for buoyancy to discharge ue products and with low ue gas temperatures,
single wall ues are suitable for most installations. Care should still be taken to maintain
compliance with building regulations and relevant standards.
The ue used should be a suitably approved ue for use on a pressurised condensing ue
system. The boiler is not suitable for use on plastic ue systems.
Condensate produced in the ue should be drained separately.
Advice regarding the availability of proprietary types of ue system can be obtained by contacting
Fulton.
All joints or connections in the ue system must be impervious to condensate leakage. Low points
in the ue system should be drained using pipe of material resistant to condensate corrosion.
All drains in the ue should incorporate a water trap.
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