The new standard H type CINQUECENTO series Low NOx burners Class 2 (< 120 mg/kWh), made in aluminum housing with a backward curved centrifugal impeller is studied and developed to get high performance and efficiency combined with low emissions. In this manner these series can burn the two flues separately. This is possible because these burners are equipped with an independent electric motor for the activation of the oil pump. As a consequence during gas firing, the oil pump motor does not operate and remains off. These burners are equipped with a high performance combustion head, designed to achieve an high irradiating flame when they run on natural gas. Instead, when they run on light oil, they are equipped with a by-pass nozzle which, using a pressure regulator, can reach a modulating ratio of 1:3. Therefore, the burners are provided with an UV photocell to control the flame during the operation. Back-pressure in combustion chamber (mbar) H455A PR-MD...SR H630A PR-MD...SR H685A PR-MD...SR

TECHNICAL DETAILS Type Auxiliary electrical power supply max. 4.550 230 V 1N AC 50 Hz 6.300 230 V 1N AC 50 Hz 6.850 230 V 1N AC 50 Hz Fan motor Pump motor Motor electrical power supply 400 V 3 AC 50 Hz 400 V 3 AC 50 Hz 400 V 3 AC 50 Hz Noise level For the configuration of the gas train, see pages 116-117. Suggested boiler drilling Approximate values (regarding model with gas train DN 80) Burner flange Approximate values

Back-pressure in combustion chamber (mbar) Back-pressure in combustion chamber (mbar) Back-pressure in combustion chamber (mbar) Minimum inlet gas pressure (mbar) Minimum inlet gas pressure (mbar) Minimum inlet gas pressure (mbar) Attention: the graph shows the value of the gas output (kW) against the corresponding pressure without the combustion chamber back pressure. To know the minimum gas pressure at gas train, in order to get the gas output, it is necessary to add the boiler back pressure to the value read on the curve.