Bosch SSB1000 SA, Manual, Page: 43 / 84

SSB 6720892984 (2019/02) US
System test | 43
7 System test
7 .1 System test (Rev 3 .0 .0 .0)
For testing the system at fixed power rates a system test can be activated
via the Installer menu or LabVision PC screen. Via the system test the
boiler can be started without CH or DHW being present. The system test
has priority.
The following modes are available:
System test mode Description
1 Not active
1 Fan only
The fan is forced to run at maximum
speed without starting the burner.
2 Low power
The burner starts and after the ignition
period has finished the burner stays at
low power
3 Ignition power
The burner starts and stays at ignition
power
4 High power
The burner starts and after the ignition
period has finished the burner stays at
high power
5 High power limited
The burner starts and after the ignition
period has finished the burner stays
at high power limited by the CH max.
power parameter
6 High limit error test Simulates the MAX_TEMP_ERROR
7 Low water cut off 1 error
test
Simulates the LWCO_1_ERROR
8 Low water cut off 2 error
test
Simulates the LWCO_2_ERROR
32 DHW pump on The DHW pump is on
64 CH pump on The CH pump is on
128 General pump on The general pump is on
160 General pump with
DHW
The general pump is on with the DHW
pump
192 General pump with CH The general pump is on with the CH
pump
Before running the system test modes first check if the heat can also be
dissipated.
NOTE: during this mode the supply temperature can be raised above
95°C (203°F). When this temperature is reached the burner will
switch off. When the supply temperature cools down to 90°C
(194°F) the burner will start again.
During the system test the general and CH pump will on.
As the boiler will run at fixed power rates there is no setpoint control
active. Also the flame recovery is not active during system test demand.
All other safety functions remain active.
The system test automatically stops after 10 minutes, after this the
system continues with normal demand handling. When the system test
mode is changed during an active system test, the 10 minute timer is
reloaded.
NOTE: for DHW
Mode_7
and DHW
Mode_8
the
Actual_Flow_
Rate
must be higher than
Flow_Rate_Start
in order that the
board can go in to system test.
7 .1 .1 System test for cascade burners with air-damper
functionality
When a cascade system is configured with an air-damper system test
demand cannot be started before the air-damper output is opened and
the air-damper input gives a feedback signal.
When a system test for a depending burner is required first a cascade
demand must be started to open the air-damper output before the system
test demand is accepted.
7 .2 Physical high limit test mode . (100°C +/- 5°C)
7 .2 .1 Starting the test
To start the physical high limit test the following steps have to be taken.
• Enable the physical high limit test on the 905PB display.
Enable menu located at:
Settings
¨
Boiler Settings
¨
Boiler Parameters
¨
(183) High Limit
Test
Menu only accessible with the factory passcode.
• Start the high limit test on the touchscreen.
After enabling the physical high limit test on the 905PB display the
physical high limit test will be enabled for 60 minutes. After 60 minutes
the test mode will return to a simulated test.
When the physical high limit test is started the control will temporarily
override several safety checks. The following settings are temporarily
changed during this test.
Parameter Update during test .
Stay/Start burning
During the test the stay/start burning
temperatures are increased to the
high limit safety setting which is set to
115°C
Maximum flue gas tempera-
ture
During the test the maximum flue gas
temperature is increased to 120°C.
Minimal CH flowrate
During the test the checks on the CH
flowrate protection are disabled by
decreasing the CH minimal flowrate to
0.0 l/m.
The test mode is limited to a maximum of 5 attempts per 24 hours. At
each start of the physical high limit test a test counter will be stored
internally in the control. This counter is reset automatically after 24 hours.
7 .2 .2
Running the test
When the physical high limit test is started the burner runs at high power
with a CH pump demand.
The supply temperature will be increased reducing progressively the
flowrate with the manual stop valves.