Dunkirk Helix VLT Vertical Laser Tube, Wall Hung Modulating Condensing Boiler - Manual (Page 76)

76
User Interface Display Explanation
Installer Menu
Bo
iler Status
Control module logs successful and failed ignition attempts.
Information accessed in ‘Ignition Attempts’ Screen as shown.
Ignition attempts are stored in non-volatile memory and are
retained in event of power failure.
Figure A-1 Typical Ignition Cycle
Following control features are implemented to ensure safe and
reliable operation of Combustion System:
False Flame
Detection
If flame is detected at end of pre-spark
period (Ignit_0) than lockout will occur.
Re-ignition
If at end of safety period no flame detected
control will go to post-purge removing
unburned gas. Re-ignition attempt started
following same cycle. Number of re-ignition
attempts limited to 3 after which lockout
occurs.
Intermittent
Operation
Boiler can be firing continuously for 24
hours. Burner switched off and restart
sequence follows.
Flame out too
late
If flame detected after post purge lockout
follows.
Safety relay test In Safety ON/OFF state correct operation
of safety relay is proved before ignition.
UL3563
High Limit
Temperature
Device
Boiler comes equipped with UL353
approved temperature high limit device.
Gas Valve de-energized when supply
temperature exceeds 203°F lockout
follows.
APPENDIX A - CONTROL MODULE