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8.1 FLUE SYSTEM GENERAL REQUIREMENTS
Detailed recommendations for the flue system are given in BS5440-1 for equipment of rated input not exceeding
70kW net, BS6644 for equipment above 70kW net and IGE/UP/10 for equipment of rated input above 54kW net. The
following notes are intended to give general guidance only.
8.2 APPROVED FLUE SYSTEM
The approved flue system is not suitable for use external to the building. If external routes cannot be
avoided, a flue system manufacturer should be consulted to supply a suitable alternative.
When used as a type C appliance, the approved, purpose designed adaptive flue system should be used. For further
details, please contact Lochinvar Limited.
When used as a Type B appliance, a suitable flue system constructed of Stainless Steel or Polypropylene with a
temperature rating in excess of 120C should be used. Aluminium flue pipe must not be used on this appliance
as it may lead to premature failure of the heat exchanger and will invalidate the warranty.
8.3 INSTALLATION PRECAUTIONS
The approved flue system is rated to 120C max. To prevent the exhaust temperature exceeding this, the
appliance is supplied with a flue gas temperature sensor. This must be fitted during the installation of
the flue system. Failure to do so may lead to severe personal injury, death or substantial property
damage.
The heater must not be operated unless the complete flue system is installed. This includes the water
heater connections, concentric adaptor (if required) flue pipes, air ducts (if required) and terminals. If
discharging at low level, a suitable flue guard must be installed.
Due to the condensing nature of the water heater, long external runs should be avoided to prevent the
condensate freezing within the flue system.
During assembly precaution should be taken to ensure that the internal sealing ring is seated correctly.
Due to the close tolerances in the flue system, it may be necessary to use a twisting action to fit the joints
together. No lubrication other than water should be used.
8.4 MAXIMUM LENGTH
Details of maximum flue lengths can be found in Table 3.1
8.5 FLUE DISCHARGE
The flue system must ensure safe and efficient operation of the equipment to which it is attached, protect the
combustion process from wind effects and disperse the products of combustion to open external air.
The flue must terminate in a freely exposed position and be so situated as to prevent the products of combustion
entering any opening in a building.
Under certain operating and weather conditions, the EcoKnight™ heater may generate a plume at the terminal.
Consideration should be given to the nuisance this may cause and the terminal should be sited accordingly.
For further information on terminal locations, please refer to Figure 8.1 and Table 8.1.
8.6 CONDENSATE DRAIN
If the flue system rises at an angle of at least 3 (50mm per metre), no additional condensate drain will be required.
Failure to provide an adequate rise in the flue system may lead to pooling of condensate which may lead to
premature failure of the flue system.
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