UTICA BOILERS UBSSC-050 Installation, Operation & Maintanance Manual page 64

User Interface Display
Installer Menu
S T A T U S
I g n i t
S u c c e s f u l
F a i l e d
APPENDIX A - CONTROL MODULE
i o n A t t e m p t s
4 2 6 7
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:
2 1 ▼
False Flame
Detection
Re-ignition
Intermittent
Operation
Flame out too
late
Safety relay test
UL3563
High Limit
Temperature
Device
64
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.