Burner Operation - resideo S8910U3000 Manuel D'installation

S8910U3000
SYSTEM WILL
NOT START
Trial for Ignition
At the end of the warmup period, the gas control opens for
the ignition trial time determined by the DIP switch
configuration. The hot surface igniter stays powered for an
ignition activation period of two seconds if the four second
trial time is used or five seconds if the seven second trial
time is used. The igniter turns off after the ignition
activation period. Near the end of the ignition trial time,
34-00008EFS—03
CALL FOR HEAT (24V
TERMINAL POWERED)
INITIALIZATION CHECKS
FLAME
SIMULATING
PREPURGE (32 SEC)
FAILURE
NO FLAME
SIMULATING
FAILURE
IGNITER WARMS UP (7
(12), 17 (27), 34 OR 45 SEC)
GAS CONTROL OPENS
FOR TIMED TRIAL
FOR IGNITION.
IGNITER OFF;
FLAME SENSING BEGINS.
FLAME
PRESENT
GAS CONTROL STAYS
OPEN (MAIN BURNER
RUNS).
CALL FOR HEAT
IS SATISFIED.
GAS CONTROL CLOSES
(MAIN BURNER OFF).
Fig. 6. S8910U normal operating sequence.
WELDED
DEVICE LOCKED
RELAYS
(REPLACE CONTROL)
DETECTED
INTERPURGE
(64 SEC)
NO
FLAME
THREE
TRIALS
GAS
FLAME
CONTROL
FAILURE
CLOSES
ONE
TRIAL
LOCKOUT OCCURS.
SYSTEM MUST BE
RESET.
the flame rectification sensing circuit determines if the
main burner flame is present. If so, the gas control
remains open and the burner operation phase begins.

Burner Operation

When the main burner is lit, a flame rectification circuit is
completed between the flame sensor (igniter on local
sense systems or flame rod on remote sense systems) and
16
LESS
THAN
THREE
HOW MANY IGNITION
TRIALS COMPLETED
THIS CALL FOR HEAT?
THREE
M35558