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CIB UNIGAS Low NOx Series Manual Of Installation - Use - Maintenance

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RX92
Gas burners
Low NOx series
MANUAL OF INSTALLATION - USE - MAINTENANCE
BURNERS - BRUCIATORI - BRULERS - BRENNER - QUEMADORES - ГОРЕЛКИ
M039308CA Rel. 0.2 05/2015

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Summary of Contents for CIB UNIGAS Low NOx Series

  • Page 1 RX92 Gas burners Low NOx series MANUAL OF INSTALLATION - USE - MAINTENANCE BURNERS - BRUCIATORI - BRULERS - BRENNER - QUEMADORES - ГОРЕЛКИ M039308CA Rel. 0.2 05/2015...
  • Page 2 DANGERS, WARNINGS AND NOTES OF CAUTION THIS MANUAL IS SUPPLIED AS AN INTEGRAL AND ESSENTIAL PART OF THE PRODUCT AND MUST BE DELIVERED TO THE USER. INFORMATION INCLUDED IN THIS SECTION ARE DEDICATED BOTH TO THE USER AND TO PERSONNEL FOLLOWING PRO- DUCT INSTALLATION AND MAINTENANCE.
  • Page 3 DIRECTIVES AND STANDARDS do not leave the equipment exposed to weather (rain, sun, etc.) unless expressly required to do so; Gas burners European directives: do not allow children or inexperienced persons to use equipment; - Directive 2009/142/EC - Gas Appliances; The unit input cable shall not be replaced by the user.
  • Page 4 -EN 55014-1Electromagnetic compatibility - Requirements for household appliances, electric tools and similar apparatus. -UNI EN 676 (Gas Burners; -CEI EN 60335-1(Household and similar electrical appliances - Safety. Part 1: General requirements; - EN 50165 Electrical equipment of non-electric appliances for household and similar purposes.

  • Page 5: General Features

    PART I: SPECIFICATIONS PART I: SPECIFICATIONS 1.0 GENERAL FEATURES Note: the figure is indicative only Control panel with startup switch Gas train Electrical panel Cover Blast tube + Combustion head Flange Silencer Adjusting cam Actuator 10 Air pressure switch 11 Combustion head adjusting ring nut The gas coming from the supply line, passes through the valves group provided with filter and stabiliser.
  • Page 6 PART I: SPECIFICATIONS 2.0 BURNERS FEATURES 2.1 Burner model identification Burners are identified by burner type and model. Burner model identification is described as follows. Type RX92 Model PR. S. BURNER TYPE RX92 FUEL M - Natural gas OPERATION (Available versions) PR - Progressive MD - Fully modulating BLAST TUBE...
  • Page 7 PART I: SPECIFICATIONS 2.3 Fuel The burner technical specifications, described in this manual, refer to natural gas (calorific net value Hi = 9.45 kWh/Stm , density ρ = 0.717 Kg/Stm ). For different fuel such as LPG, town gas and biogas, multiply the values of flow and pressure by th corrective factors shown in the table below.
  • Page 8 2.5 Overall dimensions (mm) Boiler recommended drilling tem- plate O min O max Burner flange NOTE: the overall dimensions are referred to burners provided with Siemens VGD valves. AA AD AN Omin Omax 1421 246 35 550 100 441 1005 425 1160 435 286 316 228 450 360 464 M12 424 300 532 148 384 624 190 649 228 185 1421...
  • Page 9 PART I: SPECIFICATIONS 2.6 How to read the burner “Performance curve” To check if the burner is suitable for the boiler to which it must be instal- Campo di lavoro bruciatori lled, the following parameters are needed: Tipo P60 Mod. M-xx.x.IT.A.0.50 - M-.xx.x.IT.A.0.65 furnace input, in kW or kcal/h (kW = kcal/h / 860);...

  • Page 10: Performance Curves

    PART I: SPECIFICATIONS 2.8 Performance Curves RX92 1200 1600 2000 2400 2800 To get the input in kcal/h, multiply value in kW by 860. Data are referred to standard conditions: atmospheric pressure at 1013mbar, ambient temperature at 15°C NOTE: The performance curve is a diagram that represents the burner performance in the type approval phase or in the laboratory tests, but does not represent the regulation range of the machine.
  • Page 11 PART II: INSTALLATION PART II: INSTALLATION 2.10 2.11 Packing The burners are despatched in wooden crates whose dimensions are: series 9x: 1672mm x 1072mm x 1016mm (L x P x H) Packing cases of this type are affected by humidity and are not suitable for stacking. The following are placed in each packing case: burner with detached gas train;...
  • Page 12 PART II: INSTALLATION 2.13 Matching the burner to the boiler The burners described in this manual have been tested with combustion chambers that comply with EN676 regulation and whose dimensions are described in the diagram . In case the burner must be coupled with boilers with a combustion chamber smaller in dia- meter or shorter than those described in the diagram, please contact the supplier, to verify that a correct matching is possible, with respect of the application involved.

  • Page 13: Assembling The Gas Train

    PART II: INSTALLATION 3.0 GAS TRAIN CONNECTIONS The diagrams show the components of the gas trai included in the delivery and which must be fitted by the installer.The diagrams are in compliance with the current laws. WARNING: BEFORE EXECUTING THE CONNECTIONS TO THE GAS PIPE NETWORK, BE SURE THAT THE MANUAL CUTOFF VALVES ARE CLOSED.
  • Page 14 PART II: INSTALLATION 1-a) in case of threaded joints: use proper seals according to the gas used; 1-b) in case of flanged joints: place a gasket (no. 1A..1E - Fig. 6) between the elements fasten all the items by means of screws, according to the diagrams showed, observing the mounting direction for each item; NOTE: the bellows unit, the manual cutoff valve and the gaskets are not part of the standard supply.
  • Page 15 PART II: INSTALLATION (spring) (cap) Fig. 10 Siemens VGD valves with SKP actuator : The pressure adjusting range, upstream the gas valves group, changes according to the spring provided with the valve group. 0 - 22 15 - 120 100 - 250 Performance range (mbar) neutral yellow...

  • Page 16: Electrical Connections

    PART II: INSTALLATION 4.0 ELECTRICAL CONNECTIONS WARNING! Respect the basic safety rules. make sure of the connection to the earthing system. do not reverse the phase and neutral connections. fit a differential thermal magnet switch adequate for connection to the mains.
  • Page 17 PART II: INSTALLATION 5.0 ADJUSTING AIR AND GAS 5.1 Combustion head gas pressure curves depending on the flow rate The curves referred to the gas pressure in the combustion head, depending on the gas flow rate, are referred to the burner properly adjusted (percentage of residual O in the flues as shown in the “Recommended combustion values”...
  • Page 18 PART II: INSTALLATION 5.4 Pressure - rate in combustion head curves Curves are referred to pressure = 0mbar in the combustion chamber! RX92 100 120 140 160 180 200 220 240 260 280 WARNING: the diagrams refers to natural gas. For different type of fuel please refer to the paragraph “Fuel” at the beginning of this chapter.

  • Page 19: Limitations Of Use

    PART III: OPERATION PART III: OPERATION LIMITATIONS OF USE THE BURNER IS AN APPLIANCE DESIGNED AND CONSTRUCTED TO OPERATE ONLY AFTER BEING CORRECTLY CONNEC- TED TO A HEAT GENERATOR (E.G. BOILER, HOT AIR GENERATOR, FURNACE, ETC.), ANY OTHER USE IS TO BE CONSIDE- RED IMPROPER AND THEREFORE DANGEROUS.
  • Page 20 PART III: OPERATION Fig. 12 - Burner front panel Main switch Lock-out LED Reset pushbutton for control box Reset pushbutton for gas proving system (only for burners provided with Siemens LDU11) “Gas pressure switch signal ” LED “Lock-out” LED for gas proving system Hi-flame operation LED Lo-flame operation LED “Ignition transformer operation”...
  • Page 21 PART III: OPERATION 6.0 ADJUSTING AIR AND GAS FLOW RATES WARNING! During commissioning operations, do not let the burner operate with insufficient air flow (danger of formation of carbon monoxide); if this should happen, make the fuel decrease slowly until the normal combustion values are achieved.
  • Page 22 PART III: OPERATION Start the burner up by means of the thermostat series and wait until the pre-purge time comes to an end and the burner starts up; drive the burner to high flame stage, by means fo the thermostat TAB (high/low flame thermostat - see Wiring diagrams), as far as fully-modulating burners, see related paragraph.
  • Page 23 PART III: OPERATION Gas butterfly valve closed Gas butterfly valve open 17 If it is necessary to change the burner output in the low flame stage, move cam III: the low flame position must never match the ignition position, that is why cam III must be set 20°- 30° more than cam II. 18 Turn the burner off;...
  • Page 24 PART III: OPERATION 6.5 Setting air and gas pressure switches The air pressure switch locks the control box if the air pressure is not the one requested. If it happens, unlock the burner by means of the control box unlock pushbutton, placed on the bur- ner control panel.
  • Page 25 PART III: OPERATION 6.10 Integrated proving system (burners equipped with LME7x, LMV, LDU) This paragraph describes the integrated proving system operation sequence: At the beginning both the valves (EV1 and EV2) must be closed. Test space evacuating: EV1 valve (burner side) opens and keep this position for a preset time (td4), in order the bring the test space to ambient pressure.Test atmospheric pressure: EV1 closes and keep this position for a preset time (test time td1).

  • Page 26: Routine Maintenance

    PART IV: MAINTENANCE PART IV: MAINTENANCE At least once a year carry out the maintenance operations listed below. In the case of seasonal servicing, it is recommended to carry out the maintenance at the end of each heating season; in the case of continuous operation the maintenance is carried out every 6 months.
  • Page 27 PART IV: MAINTENANCE 7.2 Removing the combustion head Attention: before adjusting the combustion head, turn the burner off and wait until it gets cold. Remove the cover C. remove the electrodes cables; unscrew the 3 screws V which hold in position the gas manifold G and pull out the complete group as shown in the picture below. Clean the combustion head by a compressed air blow or, in case of scale, scrape it off by a scratchbrush.

  • Page 28: Electrodes Adjustment

    PART IV: MAINTENANCE 7.3 Electrodes Adjustment Important Note: Check the ignition and detection electrodes after removing/adjusting the combustion head. ATTENTION: avoid the ignition and detection electrodes to contact metallic parts (blast tube, head, etc.), otherwise the boiler’s operation would be compromised. Check the electrodes position after any intervention on the combustion head.

  • Page 29: Seasonal Stop

    PART IV: MAINTENANCE 7.5 Checking the detection current Control box Minimum detection signal To check the detection signal follow the scheme in Fig. 13 or 2µA (with electrode)( Siemens LME7.. Fig. 14. If the signal is less than the value indicated, check the position of the detection electrode or detector, the electrical 70µA with UV detector) Siemens LME7...
  • Page 30 PART IV: MAINTENANCE Cleaning and replacing the detection photocell The photocell working life is about 10000 working hours (about 1 year), at max 50°C after which it must be replaced. To clean/replace the detection photocell, proceed as follows: Disconnect the system from the electrical power supply. Shut off the fuel supply;...

  • Page 31: Troubleshooting

    8.0 TROUBLESHOOTING TROUBLE CAUSE MAIN SWITCH OPEN LACK OF GAS MAXIMUM GAS PRESSURE SWITCH DEFECTIVE THERMOSTATS/PRESSURE SWITCHES DEFECTIVES OVERLOAD TRIPPED INTERVENTION AUXILIARIES FUSE INTERRUPTED DEFECTIVE CONTROL BOX DEFECTIVE ACTUATOR AIR PRESSURE SWITCH FAULT OR BAD SETTING MINIMUM GAS PRESSURE SWITCH DEFECTIVE OR GAS FILTER DIRTY IGNITION TRANSFORMER FAULT IGNITION ELECTRODES BAD POSITION...
  • Page 32 9.0 BURNER EXPLODED VIEW ITEM DESCRIPTION ITEM DESCRIPTION ITEM DESCRIPTION FLANGE 11.12.2 AIR INTAKE DAMPER 13.12 AIR INLET CONE 11.13.1 SPACER 13.13 LEVERAGE INDEX LABEL 11.13.2 SILENCER 13.14 JOINT PRESSURE PLUG 11.13.3 SILENCER 13.15 ACTUATOR SHAFT BUTTERFLY GAS VALVE 12.1 GAS FILTER 13.16 BRACKET...
  • Page 34 10.0 WIRING DIAGRAMS Refer to the attached wiring diagrams. WARNING 1 - Electrical supply 230V 50Hz 1 a.c./400V 50Hz 3N a.c. 2 - Do not reverse phase with neutral 3 - Ensure burner is properly earthed...
  • Page 36 C.I.B. UNIGAS S.p.A. Via L.Galvani, 9 - 35011 Campodarsego (PD) - ITALY Tel. +39 049 9200944 - Fax +39 049 9200945/9201269 web site: www.cibunigas.it - e-mail: cibunigas@cibunigas.it Note: specifications and data subject to change. Errors and omissions exceptd.

This manual is also suitable for:

Rx92

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