Operating Instructions For TD/TAD4 Dual Fuel Burner
June 13 9 of 165 TD/TAD4 Manual Rev 4
1.3.8 Oil Line Connections
It is essential that the final connections between the main oil supply lines and the burner fuel pump
are made with flexible oil lines that are long enough to allow the burner to be swung open on its
hinges without having to be disconnected. Care should be taken to ensure that the flexible oil lines
do not become `kinked` as this will cause damage to the flexible and result in leakage.
1.4 Burner construction
Each ‘T’ series burner is constructed from 5 separate castings described as follows:
Hinge
In common with all other body castings, the mounting casting is manufactured from aluminium
grade LM6 with the front face drilled to the dimensions given in section 1.5 of this manual suitable
for mounting studs. The rear face has two external lugs which form part of the burner hinge and is
drilled to accept the studs that are used to lock the burner closed.
Note: The fuel pipework enters this casting and it is essential that all joints and connections on the
combustion head are checked for security before the burner is hinged to the closed position. See the
maintenance section for details.
This casting houses the burner draught tube and combustion head along with the appropriate
ignition cables and flame detection equipment.
Fan case assembly
This consists of two aluminium castings with machined faces, bolted together and enclosing
the fan (which is sized to suit the particular burner model according to output and combustion
chamber resistance).
Integral with and inside the front half of the fan cases are the compressor blades; on the outside,
external lugs are attached with pins and thrust bearings to the burner mounting casting to form the
hinges.
The rear half is tapped to take the burner lifting eye and pads are used for the attachment of the
components on various models of the burner. The rear face is machined to match the air shutter
assembly, which is attached to it.
A differential air pressure switch, piped across the air inlet and pressure outlet of the combustion air
fan is mounted on the front section. Its function is to prevent the burner from firing if a supply of
combustion air is not available or to lock out the burner if the air supply is interrupted during
normal running.
Air shutter
Combustion air is introduced through two concentric castings, one rotating about the other on a
PTFE bearing surface, regulating the combustion air supply through characterised slots to
accurately maintain the fuel air ratio. Close machining tolerances ensure almost zero leakage when
the damper is fully closed. The characterisation of the slots also ensures very high control of the air
supply at the important low fire end – typically 30 degrees of movement accounts for only 10% of
air throughput thus ensuring very high turndown capability.
The operation of the air shutter is activated by a reversible, mains voltage, synchronous motor (on
high/low burners) or a 240 (or 24V) motor with potentiometer control for fully modulating units.
Adjustable rigid linkage is used and the limits of travel are set by micro switches. Final adjustments
are made during commissioning.
On burners fitted with electronic modulation systems the air shutter and the fuel valves will all be
manufactured with individual drive motors controlled by the modulation system.
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