Flue Installation - IDEAL IMAX XTRA E320 Installation And Servicing

FLUE INSTALLATION

The appropriate Ideal Flue Header Kit (veritcal or horizontal) must
be fitted to these boilers.
IMPORTANT. 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 infiltration, 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 efficiency of the boilers pluming will occur.
Particular care should be taken in the case of large output boiler
installations, and complying with the requirements of the Clean Air
Act.
The flue 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.
FLUE SYSTEM DESIGN
Due to the high efficiency of these boilers, the flue 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 flow and overcome the flue resistance.
The power of this fan is such that there is a large reserve of
pressure available to overcome a significant length of flue without
affecting the combustion performance of the boiler. The maximum
pressure available at the base of the flue to overcome flue
resistance is 145Pa (0.58" w.g.) for E320, E400, E480 and E560.
This includes the resistance of any air ducts used to connect the
air inlet direct to outside air.
See table below for approximate maximum straight flue length.
Boiler
Flue Size (mm)
Approx. max.
Straight Flue
Length (m)
If the high level air inlet kit, supplied with this appliance, is to be
utilised, the following table shows the approximate maximum
straight flue lengths and pressures available.
Boiler
Flue Size (mm)
Approx. max.
Straight Flue
Length (m)
Flue Pressure (Pa)
The addition of elbows and their positions in the flue will have
a significant effect on the maximum allowable flue and air duct
lengths. Consult with your flue supplier for detailed design work.
IMAX XTRA -
Installation & Servicing
E320 E400 E480 E560
Ø200 Ø250 Ø250 Ø250
109 235 162
E320 E400 E480 E560
Ø200 Ø250 Ø250 Ø250
57 129 67
76 80 60
GENERAL
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 flooring 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.
Where it is not possible to duct air from outside the boiler,
the air inlet pipe MUST be used, refer to Frame 12.
Material
With no requirement for buoyancy to discharge flue products
and with low flue gas temperatures, single wall flues are suitable
for most installations. Care should still be taken to maintain
compliance with building regulations and relevant standards.
The flue used should be a suitably approved flue for use on a
pressurised condensing flue system. Materials choice includes
plastic, aluminium and 316 grade stainless steel. Unless the flue
is manufactured from aluminium, the condensate from the
flue must be collected and drained before entering the sump
of the boiler (when employing the vertical combined flue outlet
header, a flue condensate drain is provided for this purpose).
Advice regarding the availability of proprietary types of flue
system can be obtained by contacting Ideal Boilers. All joints or
connections in the flue system must be impervious to condensate
leakage. Low points in the flue system should be drained using
pipe of material resistant to condensate corrosion. All drains in
the flue should incorporate a water trap.
Care should also be taken in the selection of flue terminals as
these tend to accentuate the formation of a plume and could
freeze in cold weather conditions.
Care should be taken to ensure the specification of the chimney
is suitable for the application by reference to the manufacturers
literature.
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