Bosch SSB1000 TL - Page 74

6720892984 (2019/02) US SSB
74 | Service reminder
The following table shows the states of the pump when demand is cleared:
State Actions Setting
Pump CH Pump is ON Parameter E2_CH_POST_PUMP_TIME: 30 sec
During the ignition cycle multiple safety checks are active:
Safety check Actions Setting
Flame Before Ignit
If ame is detected during the pre-spark period (Pre ignit) a
lockout error occurs
1 sec
Re-ignition
If at the end of the safety period no ame is detected the control
will go to post-purge to remove the unburned gas. After this a
re-ignition attempt is started following the same cycle.
The number of re-ignition attempts is limited to
Max_Ignit_
Trials
after which a lockout occurs.
3 trials
Flame out too late
If at the end of the Post purge 0 state the ame is still detected a
lockout follows.
10 sec
Flame loss
When a ame is lost during a burn cycle the control will restart the
burner. The number of restarts is limited by the
Max_Flame_
Trials
setting.
3 trials
Fan supervision
The fan speed is continuously monitored.
The following conditions for the fan speed are checked.
• The actual fan speed must be within 300RPM of the target fan
speed
• When in the burn state both the actual and target fan speeds
are above 4200RPM, the check on the 300RPM range is not
performed.
60 sec
Switch input Function Reaction time
Blocked Flue switch (NC) in
series with
Condensate pressure switch (NC)
The Blocking error
FLUE_PRESSURE_ERROR (156) is triggered
if one of the two inputs is open.
5 sec
LWCO (NC)
Low_Water_Cut_Off_Error is triggered.
No error is triggered during de-air.
2 sec (20 samples)
Water pressure switch (NC)
The blocking error
LOW_WATER_PRESSURE_ERROR (115) is triggered when the
input is open.
10 sec
Gas pressure switch (NC)
The locking error
GAS_PRESSURE_ERROR (35) is triggered
when the input is open.
Parameter E2_GPS_TIMEOUT: 10 sec
CH ow sensor
The blocking error
LOWEXFLOW_PROTECTION is triggered if the
ow-Rate is lower than parame-ters E2_MinExFlowRate when
the general pump is running.
Parameter E2_MinExFlowRate: 50 l/min.
Parameter (E2_PRE_PURGE_TIME - 2 )= 18 sec
When the control has a blocking error for too long a locking error is generate:
Safety Check Function Reaction time
BLOCKING_MAX_PERIOD
A blocking error can remain for a the maximum of a certain
period. After that the blocking error is cancel and the lock error
BLOCKING_TOO_LONG is triggered
1 hour