Operating Instructions For TD/TAD4 Dual Fuel Burner
June 13 42 of 165 TD/TAD4 Manual Rev 4
4.2 Pneumatic Modulating burners (M and M-sc) on Gas, High / Low on Oil
M burners use the same air gas ratio valve as used on the high low burners
and therefore connections to the valve are the same and principle of
operation is also the same.
The control system however does differ in that the position of the air damper
can be done in incremental steps via a 3-stage switched input. This is
generally performed using a temperature or pressure controller, Dunphy use
an RWF40 controller to perform this function – see component section for
more details, however any suitable controller with a 3-stage output would
suffice. The RWF40 can either be mounted on the burner panel or remotely
somewhere within the customer panel. Air damper and gas valve adjustments
are the same as with the High Low burner above.
Principle of Operation for Oil is the same as in Section 3.1.2
Burners with extension M-sc are modulating burners with inverters fitted to control the speed of the
fan. This has the benefit of higher turn-down, improved combustion, much quieter operation and
energy saving. Its set point is derived from a potentiometer situated and mechanically connected to
the back of the air damper motor. As the control box drives the air damper motor up and down
according to the appliance load characteristics, the potentiometer sends a proportional signal to the
inverter which makes the fan go faster or slower depending on whether more or less air is required.
The inverter is setup in the factory and there is no need to make any adjustments.
4.3 Electronic Modulation burners (M RT)
ME burners are fitted with electronic control systems
which have direct control over the air damper and gas
butterfly valve using high precision digital servo motors.
The Air / Gas or Air / Oil ratio is defined by a profile
curve which is programmed into the controller during the
commissioning phase.
Ratiotronic 6000 series controllers are generally fitted to
these burners however Siemens LMV2.. series and
LMV5.. series controllers may also be offered as an
alternative.
ME burners are relatively complex products and it is
recommend that they are commissioned by qualified
Dunphy personnel.
Documentation on these controllers is too lengthy to
incorporate into this document and therefore is supplied as
a separate manual. Both manuals must be used in
conjunction with each other when commissioning and
operating the burner.
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