Enertech Bentone B 2 KA, Инструкция по установке и обслуживанию

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Bentone B 2
General
6. PREHEATER
Function FPHB 5
When the boiler thermostat closes it supplies power to the preheater
PTC element in order to preheat the oil. When the oil reaches the right
temperature the preheater thermostat closes, sending the start signal to the
burner.
During operation the output of the PTC element is adjusted automatically so
that the temperature does not rise too high. If the oil temperature is low and
the oil low is high, the preheater thermostat may cut out.
Because of this it is important that the burner control system has a circuit
that maintains preheat.