UTICA BOILERS SSC UBSSC-075 Installation Operation & Maintenance page 77

User Interface Display
Installer Menu
APPENDIX A - CONTROL MODULE
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
Re-ignition
Intermittent
Operation
Flame out too
late
Safety relay test
UL3563 High
Limit Tempera-
ture Device
77
Explanation
If fl ame is detected at end of pre-spark
period (Ignit_0) than lockout will occur.
If at end of safety period no fl ame
detected control will go to post-purge
removing unburned gas. Re-ignition
attempt started following same cycle.
Number of re-ignition attempts limited
to 4 after which lockout occurs.
Boiler can be fi ring continuously for 24
hours. Burner switched off and restart
sequence follows.
If fl ame detected after post purge lockout
follows.
In Safety ON/OFF state correct operation
of safety relay is proved before ignition.
Boiler comes equipped with UL353
approved temperature high limit device.
Gas Valve de-energized when supply
temperature exceeds 203°F lockout
follows.