Weishaupt gas and dual fuel burners G, G L and RGL satisfy the requirements for operational safety, easy installation, and reliability. They operate economically and environmentally friendly. The oil side of the dual fuel burners comply with DIN EN 267. The gas burners and the gas side of dual fuel burners comply with DIN-EN 676 and the gas appliance guidelines (90/396/EEC) and are EG type tested. The burners distinguish themselves through a variety of interesting features. ■ Large capacity and range of application ■ Automatic sequence of operations ■ Combustion chamber pre-purge ■ Safe flame monitoring ■ Stable fan characteristics – good combustion results ■ Quiet operation ■ Hinged burner casing ■ Simple installation, adjustment and servicing as components are easily accessible
■ Easily converted to other types of gas ■ Fuel change on the dual fuel burner is carried out by means of a manual or automatic change over. Conversion work is not necessary ■ Automatic air closure on burner shutdown Construction All components are assembled in one unit. The motor is mounted at right angles to the air flow direction. The fan rotor is mounted on the motor shaft, which also drives the fuel pump on dual fuel burners. All the equipment used for the regulation of fuel and air is arranged clearly and is easily accessible. The burners can be hinged to left or right. This simplifies work on the combustion head, diffuser, nozzles and electrodes. Fuels Oil part (Fuel oil DIN 51603): Fuel Oil (EL) Viscosity up to 6 mm2 /s at 20°C Gas part (DVGW work sheet G260): Natural Gas E (previous description: H) Natural Gas LL (previous description: L) Liquid Petroleum Gas F Other gas types and fuels on request. Application The burners can be used on heating appliances such as hot water boilers, steam boilers, air heaters and for certain process heating applications. The burners are used in particular on modern boilers with high ratings as they can overcome high combustion chamber pressures. Regulation The control of air and fuel takes place according to fuel, burner size and requirements. ■ Sliding two stage Z ■ Sliding two stage ZM ■ Three stage (oil side only) ■ Modulating (the standard sliding two stage ZM burner with a 42 secs. servomotor can become modulating by fitting a suitable electronic controller). Sliding two stage Z burners are fitted with a servomotor with an 8 seconds running time which gives rapid control of throughput. The air damper and gas control valve are operated simultaneously by means of a cam arrangement. The simultaneous operation of gas and air ensures that start and change over impacts in the combustion chamber and gas system are small. Sliding two stage ZM and modulating burners are fitted with a slow acting servomotor, running time approx. 20 or 42 seconds. The air damper and gas control valve are operated by means of a cam arrangement. With sliding two stage regulation the partial and full load positions are fixed within the burner operating range. The burner moves to one position or the other, depending on the appliance demand. There are no rapid changes of fuel throughput. Modulating burners operate at any point within the burner range, depending on the heat requirement. Reduced start rate for gas The burners start with ignition load, which ensures that only a small quantity of gas is released into the combustion chamber. After a time delay, gas is released for the main flame. Controlled shutdown at partial load The regulator and the set point of the second stage or the modulating control enable the burner to shut down in the partial load. This avoids pressure surges in the gas system on controlled shutdown. Flame supervision The burner control, which is fitted in the control panel or mounted on the burner, sequences the operation automatically. The burner control monitors the flame and its stability with a flame sensor. On gas burners the flame sensor works on the ionisation principal. Dual fuel burners utilise a UV diode flame sensor. Magnetic clutches on dual fuel burners The coupling between the oil pump and motor is automatically disconnected when operating with gas. The pump is then protected from unnecessary wear and tear. Valve trains According to DIN-EN 676 burners must be fitted with two solenoid valves. Weishaupt gas and dual fuel burners are supplied as standard with two Class A solenoid valves (double solenoid valve DMV). Weishaupt also recommend the use of a valve proving system. According to DIN-EN 676, valve proving is compulsory from 1.200 kW. These, as well as other gas fittings as for example gas filters and gas pressure regulators can be found in our accessories list. Conversion to other gas types Weishaupt gas and dual fuel burners are identical in their construction for both Natural Gas and Liquid Petroleum Gas. When converting from one gas to another, only recommissioning is required. Site of installation Burners in standard execution (material, construction and type of protection) are designed for operation in covered areas with temperatures of -10° C to +40° C (details for oil operation in minus temperatures and installations in the open, on request).