Unigas C85A - Performance Curves

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PART I: SPECIFICATIONS

How to read the burner “Performance curve”

To check if the burner is suitable for the boiler to which it must be instal-

lled, the following parameters are needed:

 furnace input, in kW or kcal/h (kW = kcal/h / 860);

 backpressure (data are available on the boiler ID plate or in the

user’s manual).

Example:

Furnace input: 600kW

Backpressure: 4mbar

In the “Performance curve” diagram, draw a vertical line matching the

furnace input value and an horizontal line matching the backpressure

value. The burner is suitable if the intersection point A is inside the per-

formance curve.

Data are referred to standard conditions: atmospheric pressure at

1013mbar, ambient temperature at 15°C.

Performance Curves

To get the input in kcal/h, multiply value in kW by 860.

Data are referred to standard conditions: atmospheric pressure at 1013mbar, ambient temperature at 15° C

NOTE:

The performance curve is a diagram that represents the burner performance in the type approval phase or in the laboratory tests, but does not

represent the regulation range of the machine. On this diagram the maximum output point is usually reached by adjsuting the combustion head to its

“MAX” position (see paragraph “Adjusting the combustion head”); the minimum output point is reached setting the combustion head to its “MIN” position.

During the first ignition, the combustion head is set in order to find a compromise between the burner output and the generator specifications, that is why

the minimum output may be different from the Performance curve minimum

Gas pressure in

combustion head

C85A M-..

Stm

C120A M-..

Stm

Gas pressure in

combustion head

C120A L-..

Stm