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Water heaters

Workshop manual

NGW 300
LGW 300

GBW 300

NGW 300 / LGW 300 model

02/2006

Identification no. 27 101 03B

Содержание GBW 300

Страница 1: ...Water heaters Workshop manual NGW 300 LGW 300 GBW 300 NGW 300 LGW 300 model 02 2006 Identification no 27 101 03B...

Страница 2: ...7 Ignition spark generator with ignition electrodes 204 2 8 Vacuum switch 204 2 9 Gas inlet nozzles 204 2 10 Regulating thermostat 205 2 11 Temperature limiter 205 2 12 Circulating pump 205 2 12 1 U 4...

Страница 3: ...tion solenoid in the gas intake pipe 604 7 Wiring diagrams 7 1 General information 701 8 Service work 8 1 General information 801 8 2 Work on the heater 801 8 3 Work on the vehicle 801 8 4 Trial run o...

Страница 4: ...acing the SG 1585 control unit 906 9 2 4 Replacing the ignition spark generator 906 9 2 5 Replacing the ignition electrodes 907 9 2 6 Replacing the flame monitor electrode 908 9 2 7 Replacing the burn...

Страница 5: ...06 System wiring for the NGW IVECO 707 707 System wiring for the LGW NGW 300 Standard and DC 708 708 System wiring for the NGW 300 EvoBus Citaro 709 709 System wiring for the NGW 300 MAN 710 801 Disas...

Страница 6: ...Bureau of Motor Vehicles and Drivers for the NGW 300 LGW 300 and GBW 300 water heaters in the area governed by the StVZO Road Traffic Licensing Regulation S 291 for the NGW 300 heater S 313 for the L...

Страница 7: ...instructions The year in which the heater was first put into operation must be identified by the installer on its model plate by striking out removing the inapplicable years permanently The combustion...

Страница 8: ...stat in intermittent operation The heater basically consists of the burner head the heat exchanger and the combustion chamber zusammen The following components are located in the heater a control unit...

Страница 9: ...s the gas pressure of the system is regulated downward from a maximum of 30 bar of excess pressure in 2 steps to barely below atmosphe ric pressure After the solenoids have opened the required quantit...

Страница 10: ...eat exchanger the heat produced by combustion is transferred to the coolant circuit 2 4 Combustion chamber The gas air mixture is distributed in the combustion cham ber and is burned there The heat ex...

Страница 11: ...tio nal speed of the combustion air blower The signal is processed by the control unit which then activates the so lenoids on the gas pressure regulator When there is atmospheric pressure the vacuum s...

Страница 12: ...51 or the Aquavent 6000 S U 4852 circulating pump 2 12 1 The U 4851 and Aquavent 6000 S U 4852 circulating pumps The U 4851 Aquavent 6000 S U 4852 circulating pump is equipped with a brushless motor S...

Страница 13: ...otor will be swit ched from error mode into the power saving sleep mode Sleep mode In sleep mode the internal users of the motor s electronic system are switched off The consumption of current in this...

Страница 14: ...s extinguished but the combustion air fan and the circulating pump continue to run The circulating pump remains in operation during the control pause the operating indicator lights up If the temperatu...

Страница 15: ...with an error In the error after run the fan motor is immediately shut down the circulating pump will continue to run until the end of the error after run The operating indicator light blinks If ther...

Страница 16: ...ated and the heater has been examined for possible damage in particular to the cabling the temperature limiter and the regulating thermostat the head of the temperature limiter must be reset manually...

Страница 17: ...3 Description of function NGW 300 LGW 300 GBW 300 304 Blank page for notes...

Страница 18: ...kg h Nominal voltage 24 Volt 24 Volt Operating voltage range 21 30 Volt 21 30 Volt Rated power consumption without a circulating pump 110 W 100 W Pressure regulator used Landi Renzo TN 1 24V Landi Ren...

Страница 19: ...4 Technical data NGW 300 LGW 300 GBW 300 402 Blank page for notes...

Страница 20: ...al fault symptoms The following table fig 501 lists the possible general fault symptoms Fig 501 General fault symptoms page 1 of 2 Fault symptom possible cause Electrical faults The operating indicato...

Страница 21: ...Flow rate in l h Heat supply kW according to model plate Temperature difference t in K or C between the water input and output measured at the heater e g with a contact thermometer x 860 Faults in th...

Страница 22: ...thane content is below 95 by volume after the installation of a replacement burner PLEASE NOTE The CO2values for the NGW 300 replacement burner are set at the factory for utilisation with the delayed...

Страница 23: ...re opens at 125 C 8 4 C When it cools down the temperature limiter remains open until approx 5 C Once it reaches a temperature below 90 C it can be reset by pressing the button 6 3 3 Test of the ignit...

Страница 24: ...ow pressure is 2 5 0 5 mbar 6 3 8 Gas pressure regulator test ATTENTION The gas pressure regulator must not be disassembled PLEASE NOTE Testing is done when the heater is installed 6 3 8 1 General tes...

Страница 25: ...o accomplish this dismount the gas hose from the gas pressure regulator and drain the oil condensate out of the gas pressure regulator and the gas hose If the gas pressure regulator s connection port...

Страница 26: ...0 LGW 300 GBW 300 7 Wiring diagrams 701 7 Wiring diagrams 7 1 General information Figures 701 to 709 show the system wiring diagrams of the heaters with switches and or timers and vehicle spe cific ci...

Страница 27: ...ion air fan S1 ON OFF switch Heater S2 ON OFF switch Remote controlled circulating pump S3 Vacuum switch Item Designation Comment U2 Ignition electrode U3 Flame monitor electrode X1 2 pin plug connect...

Страница 28: ...tion Comment U2 Ignition electrode U3 Flame monitor electrode X1 2 pin plug connection A2 control unit X2 4 pin plug connection A2 control unit X3 8 pin plug connection A2 control unit X4 4 pin plug c...

Страница 29: ...k generator Item Designation Comment U2 Ignition electrode U3 Flame monitor electrode X1 2 pin plug connection A2 control unit X2 4 pin plug connection A2 control unit X3 8 pin plug connection A2 cont...

Страница 30: ...Item Designation Comment U2 Ignition electrode U3 Flame monitor electrode X1 2 pin plug connection A2 control unit X2 4 pin plug connection A2 control unit X3 8 pin plug connection A2 control unit X4...

Страница 31: ...U2 Ignition electrode Item Designation Comment U3 Flame monitor electrode X1 2 pin plug connection A2 control unit X2 4 pin plug connection A2 control unit X3 8 pin plug connection A2 control unit X4...

Страница 32: ...t U3 Flame monitor electrode X1 2 pin plug connection A2 control unit X2 4 pin plug connection A2 control unit X3 8 pin plug connection A2 control unit X4 4 pin plug connection A2 control unit X5 4 pi...

Страница 33: ...nerator Item Designation Comment X1 2 pin plug connection A2 control unit X2 4 pin plug connection A2 control unit X3 8 pin plug connection A2 control unit X4 4 pin plug connection A2 control unit X5...

Страница 34: ...in plug connection A2 control unit Item Designation Comment X3 8 pin plug connection A2 control unit X4 4 pin plug connection A2 control unit X5 4 pin plug connection A2 control unit X6 2 pin plug con...

Страница 35: ...esignation Comment U3 Flame monitor electrode X1 2 pin plug connector A2 control unit X2 4 pin plug connector A2 control unit X3 8 pin plug connector A2 control unit X4 4 pin plug connector A2 control...

Страница 36: ...st be cleaned Outside of the heating season the heater should be operated when the vehicle s engine is cold approx every 4 weeks for 20 minutes set at warm and using the slowest fan level In that way...

Страница 37: ...please ensure that the ignition electrodes and the flame monitor electrode are not twisted 1 Slide the burner head 5 fig 801 carefully 5 fig 801 into the reassembly position 2 Swivel in the screws 3...

Страница 38: ...ken not to suck in any exhaust gas If the heater is installed in an enclosed installation box a ventilation opening of at least 100 cm2 is required The combustion air intake line can be extended with...

Страница 39: ...eturn Gas pipe Water heating circuit wall mounted heater and roof duct heating 1 Wall mounted heater with fan 2 Heat exchanger access 3 Heater 4 Circulating pump 5 Roof heat exchanger 6 Vehicle engine...

Страница 40: ...tening torque of 15 5 Nm 2 If there is an exhaust line secure it with a gripping clamp at the exhaust outlet 3 Mount the coolant hoses and secure with hose clamps 4 Open the water cocks if present 5 M...

Страница 41: ...must they lead to the formation of deposits Then allow the vehicle to run at a higher speed until the cooler thermostat opens Shut down the vehicle s engine and examine the state of the coolant If ne...

Страница 42: ...9 1 1 2 Visual inspection of the combustion chamber Examine the combustion chamber for scaling and re pair if necessary Examine the welded seam for cracks and repair if ne cessary PLEASE NOTE Cracks i...

Страница 43: ...required disconnect the connector from the control unit to the gas pressure regulator 6 Disconnect the connector plug between the control unit and the heater 7 Remove the control unit and retaining sp...

Страница 44: ...s installed in a compact unit it is only possible to replace it with difficulty and its operability must be checked separately Implementation U 4851 circulating pump ATTENTION When installing the U 48...

Страница 45: ...oses must be laid without kinks and going up wards Hose connections must be secured with hose clamps to prevent them from slipping No solenoids or other shut off valves which could be closed during th...

Страница 46: ...proper connection with the heat exchanger jacket PLEASE NOTE The rubber cap must be fitted in such a way that its cable sleeve runs in the direction of the heater s centre line Af ter the rubber cap h...

Страница 47: ...tion spark generator PLEASE NOTE The ignition spark generator must be replaced complete with electrical connections to the ignition electrodes 9 2 4 1 Dismantling 1 1 Dismount the burner head see 8 5...

Страница 48: ...eeves up PLEASE NOTE The rubber sleeves must be pushed up agains the gasket Otherwise there is a risk of spark over von due to moisture 2 Attach the ignition electrodes 3 with cylinder screws 4 Tighte...

Страница 49: ...2 7 Replacing the burner 9 2 7 1 Disassembly 1 Dismantle the burner head see 8 5 1 1 ATTENTION During the following procedure please ensure that the ignition electrodes and the flame monitor electrod...

Страница 50: ...assembled see 9 1 1 9 2 8 2 Reassembly 1 Press the bearing 15 fig 908 onto the shaft 14 until they form a bond PLEASE NOTE Insert the pin 22 until it sticks out equally on both sides of the shaft 14 2...

Страница 51: ...wo screws and nuts 19 Mount the hose line from the vacuum switch 3 to the gas mixer 1 20 Re establish the vacuum switch s 3 electrical connections 3 21 Attach the bracket 2 for the wiring harness conn...

Страница 52: ...amber 1 fig 909 into the heat exchanger 2 2 Install the temperature limiter see 9 2 1 2 3 Install the temperature regulator see 9 2 2 2 4 Mount the burner head see 8 5 1 2 5 Install the heater see 8 7...

Страница 53: ...with clamps ATTENTION Before installing new gas pressure regulators the enclo sed connector 1 fig 910 for the reference pressure line must be screwed into the casing cover aligned in the di rection o...

Страница 54: ...ey are protected from damage during handling trasnportation and storage A description of the defect must be enclosed ATTENTION If an entire heater is being sent back it must be completely emptied When...

Страница 55: ...10 Packaging Storage Shipping NGW 300 LGW 300 1002 Blank page for notes...

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