The quality is guaranteed by a quality and management system certified in accordance with UNI EN ISO 9001. Manufacturer's Declaration RIELLO S.p.A. declares that the following products comply with the NOx emission limits specified by German standard “1. BImSchV release 26.01.2010”.
During operation, burner output varies between: • a MAXIMUM OUTPUT, selected within area A, • and a MINIMUM OUTPUT, which must not be lower than the minimum limit in the diagram. RLS 250/M MZ = 550 kW Important: The FIRING RATE area values have been obtained considering a surrounding temperature of 20 °C, and an atmospheric pressure of 1000...
In order to guarantee that emissions do not vary, 28.0 103.05 113.71 123.58 1358.84 recommended and/or alternative nozzles speci- 30.0 110.41 121.83 132.41 1455.90 fied by Riello in the Instruction and warning 32.0 117.77 129.95 141.24 1533.47 booklet should be used. 34.0 125.13 138.08 150.06 1629.31 35.0...
The deliveries of the 1st and 2nd stages must be contained within the value range indicated on page 3. Use nozzles with a 60° spray angle at the rec- ommended pressure of 12 bar. As a rule the two nozzles have equal deliveries but the 1st stage nozzle may have a delivery less than 50% of the total delivery when a reduction of the counter-pressure peak is...
ADJUSTMENTS BEFORE FIRST FIRING SETTING THE COMBUSTION HEAD (light oil operation) • Combustion head setting The setting of the combustion head depends exclusively on the maximum burner output. Turn screw 5)(A) until the notch shown in dia- gram (B) is level with the front surface of flange 6)(B).
LIGHT OIL SUPPLY (A) The burner is equipped with a self-priming pump which is capable of feeding itself within the limits listed in the table at the side. The tank higher than the burner A The distance "P" must not exceed 10 meters in order to avoid subjecting the pump's seal to excessive strain;...
BURNER CALIBRATION (light-oil operation) ROTATION OF PUMP MOTOR N.B. It is advisable to first set the burner for operating on oil and then for gas. WARNING Execute the fuel exchange when the burner is off. Rotation of pump motor Refer to Fig. (A). WARNING FIRING Set switch 1)(C)p.10 to "MAN".
GAS FEEDING Explosion danger due to fuel leaks in the presence of a flammable source. Precautions: avoid knocking, attri- tion, sparks and heat. Make sure that the fuel interception tap is closed before performing any operation on the burner. The fuel supply line must be installed by qualified personnel, in compliance with current standards and laws.
GAS PRESSURE 1 p (mbar) 2 p (mbar) The adjacent table shows minimum pressure losses along the gas supply line depending on G 20 G 20 G 25 G 25 the maximum burner output operation. 1230 12,7 1367 10,3 15,4 The values shown in the table refer to: Natural gas G20 PCI 9.45 kWh/Sm 1503...
ADJUSTMENTS BEFORE FIRST FIRING MIN GAS PRESSURE SWITCH MAX GAS PRESSURE SWITCH AIR PRESSURE SWITCH (gas operation) Adjustment of the combustion head has been illustrated on page 8. In addition, the following adjustments must also be made: Open manual valves up-line from the gas train.
SERVOMOTOR (A) SERVOMOTOR The servomotor provides simultaneous adjust- ment of the air gate valve, by means of the vari- able profile cam, and the gas butterfly valve. The servomotor rotates through 130 degrees in 33 seconds. Do not alter the factory setting for the 5 cams; simply check that they are set as indicated below: Cam I...
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2 - MAX. OUTPUT Max. output of the burner must be set within the firing rate range shown on page 5. In the above instructions we left the burner run- ning in MIN. output operation. Now press button 2)(A) “increase output” and keep it pressed until the servomotor has opened the air gate valve and the gas butterfly valve.
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4 - INTERMEDIATE OUTPUTS Adjustment of gas delivery No adjustment of gas delivery is required. Adjustment of air delivery Press the button 2)(A)p.16 “output increase” a little so that the servomotor turns by about 15°. Adjust the screws until optimal combustion is obtained.
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5 - AIR PRESSURE SWITCH (A) AIR PRESSURE SWITCH Adjust the air pressure switch after having per- formed all other burner adjustments with the air pressure switch set to the start of the scale (A). With the burner working at MIN output, insert a combustion analyser in the stack, slowly close the suction inlet of the fan (for example, with cardboard) until the CO value does not exceed...
BURNER OPERATION NORMAL FIRING (n° = seconds from instant 0) BURNER STARTING (A) • 0s: TL closes. Fan motor starts. • 6s: Servomotor starts: 130° rotation to right, until contact is made on cam I (C)p.16. The air gate valve is positioned to MAX.
MAINTENANCE FLAME INSPECTION WINDOW NOTES ON SAFETY FOR THE MAINTE- NANCE The periodic maintenance is essential for the good operation, safety, yield and duration of the burner. It allows you to reduce consumption and pollut- ing emissions and to keep the product in a relia- ble state over time.
Gas leaks Make sure that there are no gas leaks on the pipework between the gas meter and the burner. Gas filter Change the gas filter when it is dirty. Servomotor Disengage the cam 4)(B)p.16 from the servo- motor, by pressing and moving button 3)(C)p.16 towards the right, and turn it backwards and for- wards by hand to make sure it moves freely.
FAULTS - POSSIBLE CAUSES - SOLU- TIONS The control box is equipped with a lockout indi- Lockout indicator cator (A) that turns during the start-up pro- Start-up sequence gramme, and is visible from the small lockout b-b’ Idle stages (without contact con- window.
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SYMBOL PROBLEM POSSIBLE CAUSE RECOMMENDED REMEDY No electrical power supply Close all switches and check connections A limit or safety thermostat/pressure switch open Adjust or replace Control box lockout Release the control box Control box fuse interrupted Replace it Incorrect electrical wiring Check Defective control box Replace...
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SYMBOL PROBLEM POSSIBLE CAUSE RECOMMENDED REMEDY Faulty flame sensor Replace worn parts Burner goes into lockout dur- Air pressure switch faulty Replace ing operation Maximum gas pressure switch intervention Adjust or replace Lockout when the burner Permanent flame in the combustion head or flame Eliminate permanency of flame stops simulation...
APPENDIX Layout of electric panel board CONTENTS References layout LFL1... operational lay-out LFL1... operational lay-out LFL1... operational lay-out Electrical connections set by installer RWF40... operational lay-out References layout /1 .A 1 No. page Coordinates...
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Key to layouts Burner components Boiler components External burner components Control box Protection against radio interference Output power regulator RWF40 DC input 4...20 mA DC input 4...20 mA for modifying the remote setpoint Pressure probe Pressure probe Remote setpoint voltage divider Thermocouple probe Probe Pt100 with 2 wires Probe Pt100 with 3 wires...
Riello S.p.a. declines all responsibility for changes or wiring performed in any way other than that illustrated in these diagrams. Do not invert the neutral with the D8685 phase wire in the electricity sup- ply line.