background image

Page 21

XGN Handbook

Incorrect Rotation of Burner Motor

The Fan Motor rotates clockwise viewed from the

shaft end.  If the motor  is single phase, replace the

motor.  If three phase, interchange any two phases.

Motor & Fan – Removal

Remove the control package cover and disconnect

the four gas train plugs from the MBC controller.
Remove the retaining screw securing the control

package to its mounting bracket.
Lift the complete control package from the

mounting bracket and rest it on top of the burner

casing.
All the motor securing devices will now be visible

and accessible.

Burner Motor Fails to Start

Check:

that the electrical supply is available and the

burner is correctly wired

all fuses for continuity and size

all control instruments are “calling for heat”

the MBC control is not locked out

The gas supply is not isolated

There is sufficient gas pressure

The gas pressure switch is correctly set

Starting Flame Failure Without Ignition

Check:

The glass envelope of the IR detector is clean

and correctly positioned

The IR Detector sensitivity and its wiring

The air pressure switch is set correctly

The electrode is correctly set and the porce-

lain is not cracked

The ignition transformer is not faulty

Starting Flame Failure Without Flame

Check:

The air setting is correct

There is sufficient gas under ignition

conditions

Ensure that the start rate gas flow

does not exceed 30% of the high

flame gas rate as measured at the

Gas Meter.

The gas valve(s) operate correctly

Burner Fails to Establish Main Flame

Check:

The gas butterfly is operating correctly

The combustion air is set correctly

There is sufficient gas

IR Detector Possible faults

If the LED’s light up during the pre-purge phase.

Sensitivity set too high.

Stray light.

Ignition spark visible to detector (directly or

reflection). Correct by preventing direct sight

of ignition spark.

Interference from ignition cable (lay cables

some distance apart, or possibly screen the

detector).

No indication from LED’s after establishment of

flame:

Incorrect or faulty wiring.

Sensitivity set too low.

Detector positioned wrongly (receives no

light).

Detector or viewing window dirty.

Defective detector.

6FH Error - Failure of the air servo motor

Isolate the burner from the power supply and

check the lead connectors at the motor and

controller for a positive location.

Disconnect the servo motor from the air

damper shaft. With the gas supply isolated

restart the burner and check the display runs

through the "Check servo drive" displays. If

6FH is reported, the servo motor and lead

should be replaced. Under no circumstances

attempt to dismantle the servo motor to at-

tempt repair.

Check that the air damper shaft rotates freely.

Check the damper blade runs clear of the

inlet casting in all positions. Check that the

bearings fitted at each end of the air damper

shaft run free and smooth. Clean and lubri-

cate the bearing surfaces with copper grease

if necessary.

Summary of Contents for XGN Series

Page 1: ...Page 1 XGN Handbook HANDBOOK Series XGN fully automatic burners Models XGN450 to XGN3000 Natural Gas...

Page 2: ...es 10 Combustion Chamber Conditions 10 PACKAGING FOR TRANSIT 10 ASSEMBLY 10 INSTALLATION 11 General 11 Fitting to the Appliance 11 Electrical 11 BURNER AIR CONTROLS 11 Air Diffuser 11 Air Pressure Swi...

Page 3: ...r Assembly 19 Air Diffuser and Gas Nozzle 20 Ignition Electrode 20 Replacement of Control Valve SKP2x 20 FAULT FINDING 20 MBC Error Codes 20 Incorrect Rotation of Burner Motor 21 Motor Fan Removal 21...

Page 4: ...XGN Handbook Page 4...

Page 5: ...h a condition should occur during commissioning or subsequent use of this product be it a fault of the burner the appliance or of any instrument machine or service in the proximity of the burner then...

Page 6: ...N1750 38 136 1014 265 255 165 287 104 227 429 583 394 289 2 265 305 XGN2100 34 118 957 265 223 165 287 104 227 385 583 394 269 2 230 305 XGN2350 38 171 1014 265 255 165 287 163 227 429 794 457 289 DN6...

Page 7: ...lame Tube 11 Diffuser Plate 6 Pilot Gas Tube Burner A B C D E F G Nozzle Side Ports Nozzle End Ports XGN450 23 71 96 135 155 146 168 19 8 x 8 0 8 x 4 0 XGN650 23 71 96 135 160 151 168 19 8 x 10 0 8 x...

Page 8: ...el Motor kW rpm Start Current A Full Load Current A Main Fuse A Cable Size mm2 XGN450 23 0 75 2800 8 0 2 0 10 1 0 XGN650 23 0 75 2800 8 0 2 0 10 1 0 XGN1000 25 1 1 2800 9 0 2 7 10 1 0 XGN1150 38 3 0 2...

Page 9: ...LUG HIGH LOW BURNER APPLICABLE TO ALL BURNERS MAKE CONNECTIONS AS APPROPRIATE AUXILLARY CONTACT MOTOR STARTER C ONNECTIONS TO THE 7 4 P IN P LUGS H L B URNER 7 PIN WIELAND B4 S3 T2 T1 N E L1 BURNER RU...

Page 10: ...aintenance To avoid any restriction in gas flow the size of this valve should not be less than that of the gas train FEATURES Flue and Chimney Requirements The flue and chimney must be constructed and...

Page 11: ...perating cycle Air flow failure at any stage after pre purge will result in a lockout failure during pre purge will result in four restarts before a lockout BURNER GAS CONTROLS Gas Nozzle The holes in...

Page 12: ...anual valve for a few seconds then close and secure the gas supply The manometer will detect any gas leakage and will prove that gas is not leaking past the gas train If no drop in pressure is recorde...

Page 13: ...show seven short lines the first flashing and is ready to accept the code The default pass code is 8904236 To enter the first number eight press the plus key eight times or the minus key twice 10 8 2...

Page 14: ...his number nine in this illustration press key nine times or the key once 10 9 1 Again the flashing line will drop to indicate it has been recorded Press key 2 to move to the next number zero the thir...

Page 15: ...2 together to access the display point Bu Wait until the display is steady Adjust the value to reflect the air damper angle at P1 Press keys 1 and 2 again to access the display point bo Wait until th...

Page 16: ...hed off a by controlling instruments of the appliance b manually c by power failure Upon restoration of power the burner will restart automatically and follow the normal sequence THE RWF40 MODULATION...

Page 17: ...ue found to be in error up down buttons At the last screen the PGM button will return the controller to the original operating display Parameter Display Hot Water Steam Proportional band Pb1 10 1 Deri...

Page 18: ...d When in the service mode the display will move to the next screen and finally back to the operating display with each press of the acknowledgement key MBC DISPLAYS Standby Display Operating Display...

Page 19: ...pply to the burner Combustion Air Fan Clean the blades regularly with a stiff brush Access is obtained through the burner top cover Care should be taken to avoid damaging the fan blades Check that the...

Page 20: ...Any modifications to the installation or component settings resulting from actions suggested below may require the re establishment of the various settings During the purges and firing cycles the MBC...

Page 21: ...e gas flow does not exceed 30 of the high flame gas rate as measured at the Gas Meter The gas valve s operate correctly Burner Fails to Establish Main Flame Check The gas butterfly is operating correc...

Page 22: ...SPARE PARTS For spare parts contact Nu way s Parts and Components Division at the address and telephone number listed on the rear cover of this handbook To avoid delays please provide the burner model...

Page 23: ...Page 23 XGN Handbook XGN450 23 XGN650 23...

Page 24: ...XGN Handbook Page 24 XGN1000 25 XGN1150 38...

Page 25: ...I n c h S t d G a s T r a i n G a s H e a d P r e s s u r e C o m b A i r H e a d P r e s s u r e 1 5 I n c h O p t i o n a l G a s T r a i n 2 I n c h S t d G a s T r a i n 2 5 x 2 I n c h O p t i o...

Page 26: ...n c h S t d G a s T r a i n G a s H e a d P r e s s u r e C o m b A i r H e a d P r e s s u r e 2 5 x 2 I n c h O p t i o n a l G a s T r a i n 2 I n c h O p t i o n a l G a s T r a i n 2 5 x 2 I n c...

Page 27: ...2 I n c h S t d G a s T r a i n G a s H e a d P r e s s u r e C o m b A ir H e a d P re s s u re 2 I n c h O p t i o n a l G a s T r a i n 2 5 x 2 I n c h O p t i o n a l G a s T r a i n 2 5 x 2 5 I n...

Page 28: ...l No Commissioning Date Spec n No Guarantee Expiry Date Gas Type Gas Pressure upstream of the main gas governor Standing mbar Running mbar Set point P0 P1 P2 P3 P4 P5 P6 P7 P8 P9 Gas pressure at burne...

Page 29: ...9 XGN Handbook BURNER SERVICE RECORD The details below are to be completed by the Servicing Engineer This sheet to be completed and signed following each service adjustment Date Details Of Service Sig...

Page 30: ...XGN Handbook Page 30 NOTES...

Page 31: ...Page 31 XGN Handbook NOTES...

Page 32: ...Page 32 NU WAY LIMITED P O Box 1 Vines Lane Droitwich Worc WR9 8NA England Telephone 01905 794331 e mail info nu way co uk Fax Office 01905 794017 Parts Components 01905 795829 XGN Handbook PMD Revis...

Reviews: