Flue Terminal Position; Flue Gas And Air Supply System; Approved Flue System; Installation Precautions - Lochinvar TTW Series Installation, Commissioning And Maintenance Instructions

10.2

FLUE TERMINAL POSITION

Any flue termination must be in such a position as will not cause a hazard to the health of persons who may be
nearby or a nuisance to other persons beyond the curtilage. The flue terminal must be positioned externally such
as to allow the dispersal of products of combustion and air intake. The terminal should be installed in a location
where it will not easily flood or be blocked by snow. Under certain operating and weather conditions, the TTW
may generate a plume at the terminal. Consideration should be given to the nuisance this may cause and the
terminal should be sited accordingly.
The flue terminal position is very important and must be in accordance with the recommendations found in BS6644
or IGE/UP/10. Once the terminal position has been determined the appropriate local authority should be advised
of the proposed installation. It is important that the appropriate local authority is consulted at an early stage in
the design in order to establish that the proposed flue discharge positions are acceptable and will not cause
significant local exceedances of air quality objectives.
Where agreement is reached with the local authority, this should be recorded in a reproducible format as
competent people involved at the latter stages of the project (i.e. the commissioning engineer) will ask for proof
before allowing products of combustion to be discharged in an apparently non-compliant position.
10.3

FLUE GAS AND AIR SUPPLY SYSTEM

The overall resistance of the air supply and exhaust ducts must not create a pressure drop exceeding 200 Pa. The
output of the water heater is influenced by the resistance of the air supply and discharge system therefore all flue
gas and air supply systems must be carefully considered or referred to a specialist flue design company.
Details of air inlet and exhaust locations and sizes can be found in 4.0 TECHNICAL DATA.
10.4

APPROVED FLUE SYSTEM

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 120C should be used.
10.5

INSTALLATION PRECAUTIONS

The water heater must not be operated unless the complete flue system is installed. This
includes the water heater connections, flue pipes, air ducts (if required) and terminals.
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 any 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.
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