English to Russian Tech/Engineering Engineering: Industrial two stage gas burner

In order to trasform the burners from NATURAL GAS to L.P.G. gas, and contrarily it is enough to substitute the HEAD KIT.
Whilst for the trasformations from short head to long head it is necessary to require the HEAD KIT, REGULATION COMBUSTION HEAD, BLAST TUBE.
After every trasformation it is indispensable to recalibrate the burner