Information Nozzles

Detail information about Danfoss Oil Nozzles
How is the correct danfoss oil nozzle chosen?
Boiler capacity and danfoss nozzle size
Is it possible to compare danfoss oil nozzles of different makes?
What can disturb the function of the danfoss oil nozzle?
Tips for change of the danfoss oil nozzle
What causes an danfoss oil nozzle to drip?
What causes after drip of oil when the burner stops?
What is the cause of no oil from the danfoss nozzle?
Danfoss Nozzle General Information
Danfoss Nozzle Spray Patterns
Danfoss Nozzle Technical Data
Danfoss Nozzle Spray Angles and Capacities
Danfoss Nozzle Critical Points
Danfoss Industrial Nozzles

Danfoss Oil Nozzles

Danfoss Oil Nozzles Charts


Danfoss Nozzle General Information

Industrial and Residential Oil Nozzles, Oil Burner Nozzles, Spray Nozzles, Water Nozzles, Burner Spares and Burner Nozzle in India


How is the correct oil nozzle chosen?

When a Danfoss oil nozzle needs replacing and all that has to be done is swap old for new, it is a simple matter to make sure that the numbers and letters on each nozzle correspond. If the designation on the old nozzle has become illegible, something that happens most often because of clumsy handling, the instruction book will contain details as to the right type and size to use. Should the nozzle designation be illegible and the instruction book lost, the size of nozzle must be chosen to match the boiler capacity. This information will be on a type plate fitted on the boiler, failing this it is recommended that you contact the boiler manufacturer.




Boiler capacity and nozzle size

The capacity of a boiler is normally stated either as kcal/h or as kW

a) kcal/h = kilo calorie per hour As each kilogram of fuel oil at combustion yields 10,000 kcal = 10 Mcal, it is easy to calculate what nozzle size to choose.


 b) kW = kilowatt The designation kW will be used more frequently in future, as the unit forms part of the SI-system of measurements.

1 litre of fuel oil yields at combustion approx. 10 kW. It is therefore easy to choose the right size of a Danfoss oil nozzle for a boiler if the capacity is stated in kW.As Danfoss oil nozzles are marked with kg/h, a conversion must be made.


1 litre of fuel oil = 0.84 kg, e.g. 20 kW boiler capacity = 2 litres or 1.68 kg/h at a pump pressure of 10 bar. The examples overleaf show how simple it is to calculate the nozzle sizes for a different pressure.



Is it possible to compare oil nozzles of different makes?

The situation may arise where a nozzle of another make is to be replaced by a Danfoss oil nozzle and the question arises how to compare the different makes. The instruction book of the oil heating plant often contains advice and gives information on the different makes and types to use. Capacities given for the different nozzle types can be directly compared. Spray angles too can be compared as the size of the angle is stamped on the oil nozzle. View
Conversion table for  Danfoss oil nozzles



What can disturb the function of the danfoss oil nozzle?

In connection with service visits the question is often asked what has caused the oil nozzle to fail? We will here try to describe some of the most frequent faults and how they can be rectified.

Setting of the burner
The most frequent fault is probably wrong setting of the burner. The values stated by the burner manufacturer must be observed, such as pump pressure, adjustment of ignition electrodes, etc. It is especially important that the adjustment of the two ignition electrodes is strictly accurate. It is of frequent occurrence that the ignition electrodes are not adjusted correctly and the ignition goes from an electrode to the oil nozzle. This is clearly seen from burned spots or from advanced grooves in the oil nozzle. Nowadays the location of the oil nozzle in relation to the baffle plate is often optimized with firm impact rims in the burner. The right spray angle is also very important, both to prevent the oil from the oil nozzle spraying against the baffle plate and to prevent the mixture proportion between air and oil mist to change because of a too small spray angle.



Tips for change of the danfoss oil nozzle

The right way to change an danfoss oil nozzle: When changing an oil nozzle, it is especially important that the nozzle holder is bled well and the oil passages are cleaned. After demounting of the old oil nozzle in a horizontal position (pos. 1), the nozzle holder is cleaned with a clean, flockfree cloth. Then the burner is placed in service position (pos. 2) and in this position, vertically upwards, the nozzle holder is filled to the rim with fuel oil.

Now the new oil nozzle is slowly screwed in so that the air in the oil nozzle can be let out. After the new oil nozzle has been inserted, the nozzle plate should not be touched with the fingers any more to prevent dirt in the nozzle orifices.

By doing so, it is prevented that dirt loosened during demounting of the oil nozzle stays in the nozzle holder and later causes the nozzle to fail. Never use aggression when mounting the nozzle as this can ruin the sealing surface between the oil nozzle and the nozzle holder.


What causes an oil nozzle to drip?

In fairness it has been maintained from the beginning that in most cases the oil nozzle is not the cause of after dripping. But whatever the cause may be, after dripping from the oil nozzle must in any circumstances be stopped as quickly as possible to prevent soothing up of the burner head or the area around it or the combustion chamber.

Oil drips when the burner starts
This can happen during preheating in the oil preheater when the oil expands or during prepurge due to a dirty or defective closing valve in the oil pump.

Oil is dripping during operation
The oil nozzle is located too far from the baffle plate or the burner head.
Igniton electrodes protrude into the oil mist, so they are placed incorrectly.
Dirt in the oil nozzle or oil coke in and on the nozzle orifice.
The nozzle orifice is defective, because of attempts to clean it.
Too low oil pressure. Remember to check now and then.


What causes after drip of oil when the burner stops?

Afterdrip of oil when the burner stops When the burner stops and the oil nozzle sprays a jet of oil instead of cutting off the oil supply with lightening rapidity, the most likely reasons are: A slight leak in the suction line may result in tiny amounts of air getting into the oil pump, the pressure
line or the oil nozzle.

Such an amount of air is, however, not sufficient to disturb the function of the burner, but large enough to produce an afterdrip and even an oil jet when the burner stops. This will eventually lead to the parts getting dirty and cause malfunction.

The oil in the oil pressure line between the pump and the oil nozzle contains air.

Even with a perfectly operating closing valve and a thorough bleeding of the pressure lines, afterdrip of oil can be seen because of the radiation of heat from the combustion chamber, which expands the oil and forces it into the oil nozzle after the burner has stopped.


What is the cause of no oil from the nozzle?

To say the least, it is irritating if not one drop of oil emerges from the nozzle. To eliminate the problem, follow the rules below for “immediate help” step by step.

Is there oil in the tank?
Is the valve on the suction line open or closed?
Is the check-valve on the suction line the wrong way round?
Does the pump shaft rotate?
Is the connection between pump and motor ok?
Can any suction effect of the pump be seen?
How much vacuum does the vacuum meter show?
Can the presence of air be seen in one of the transparent test hoses on the suction side of the pump?
     The reason may be a too high vacuum or a leaky suction line.
Is the pump filter clean and in good order?
Are the valves (the hydraulic valve or the solenoid valve of the pump) open and working properly?
Is there dirt in the oil pressure line to the oil nozzle?
Is the nozzle filter clean and in good order?
Is the oil nozzle blocked?
Is the oil very cold and thick?
     Perhaps some water in the oil has turned into ice.

If all these factors are checked and ordered as necessary, the oil nozzle should spray oil.

Danfoss Nozzle | Service and Storage Accessories in Mumbai

All types of Nozzles are available in Mumbai (India)  |  We are leading importers, distributors and stockists of Danfoss Nozzle in India since 1996 - 97 (Yash Hitech Systems)

Office Address

Gala no: U - 50 / U - 150,
Ground / First floor, Jai Matadi Compound,
Opp Rajlakshmi Complex,
Near Paliwal Milk co,
Thane - Bhiwandi Road,
Kalher, Bhiwandi - 421302,
Thane, Maharashtra.

Tel: 02522 - 326019, 662064, 326569

Mobile : 9820524582 | 9820344636

                     9323220221 | 9322310718


Fax No : 02522 - 662047

Bank Details



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Branch: Majiwade, Thane Branch





MICR CODE : 400012077

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