Air Diffuser And Gas Nozzle; Ignition Electrode; Replacement Of Control Valve Skp2X; Ault Inding - Nu-Way XGN Series Handbook

Open the hinged extension, disconnect the
ignition electrode H.T. lead and remove the cap
head screw securing the inner assembly gas pipe
to its manifold. Carefully withdraw the inner
assembly from the hinged extension.

Air Diffuser and Gas Nozzle

Clean using a stiff brush.

Ignition Electrode

Clean and check the electrode is not cracked or
worn. Renew if necessary.
Check the settings of the ignition electrode and
reset if necessary, details are shown on page 6.
Replace all components and covers and secure all
fittings. The burner is now ready for operation.
Switch on the electricity supply and gas supply to
the burner.

Replacement of Control Valve SKP2x

Should the SKP2x valve require replacing due to
mechanical or electrical failure, then the governed
gas pressure will have to be reset. It is essential
that only qualified combustion engineers
undertake replacement of these components.
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F F
AULT INDING
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 control
checks for both internal and external faults. Should
a fault be found the control causes a safety
shutdown and flashes an error code on the display.
The last six error codes are kept and can be
obtained from the service mode screen ten
onwards.

MBC Error Codes

Code
Air pressure switch not in rest
20H
position
21H Air pressure switch failure
22H Gas pressure switch failure
25H No flame after safety period
26H Extraneous light
27H Flame failure during operation
2BH Short circuit in photoresistor
43H First valve leaking
44H Second valve leaking
66H Gas servomotor or coding plug
68H Air servomotor acknowledgement
69H Gas servomotor acknowledgement
6AH Air motor position out of tolerance
6BH Gas motor position out of tolerance
Motors have been interchanged or
6EH
incorrectly connected
Either gas or air servo motor unable
6FH
to find reference positions
All
Internal device fault
others
XGN Handbook
Error Description