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Building Technologies Division
Basic Documentation LME7...
CC1P7105en
Infrastructure & Cities Sector
1 Safety notes
29.11.2011
1.5 Commissioning
notes
Prior to commissioning the system, the following points must be checked:
Correct assignment of the valves to the valve outputs at the LME7...
Correct setting of the time parameters, especially the safety and prepurge times
Correct functioning of the flame detector in the event of loss of flame during
operation (including the response time), with extraneous light, during the prepurge
time and, when there is no establishment of flame, at the end of the ignition safety
time
During commissioning, check
all safety functions
There is no absolute protection against incorrect use of the RASTx connectors.
For this reason, prior to commissioning the plant, check the correct assignment of
all connectors
Electromagnetic emissions must be checked on an application-specific basis
For display of the flame on the AZL2…, following general conditions apply:
- Display is subject to various component tolerances so that deviations of
10% can occur
- Note that for physical reasons there is no linear relationship between flame
display and detector signal values
The functions of the following available or required input state signals must be checked:
Air
pressure
Minimum gas pressure and maximum gas pressure or POC
Safety loop (e.g. safety limit thermostat)
Duties of the expert when making the approval tests
Action
Check/response
a)
Burner startup with flame detector disconnected
Lockout at the end of 1st safety time
b)
Burner startup with flame detector exposed to
extraneous light, e.g. to incandescent light with
detectors for visible radiation, quartz-halogen bulb
or cigarette lighter flame with detectors for UV
radiation
Lockout during prepurge time
c)
Simulation of loss of flame during operation. For
that, disconnect the flame detector in the operating
position and maintain that state
Lockout or restart, depending on the burner control’s
configuration
d)
Check the plant’s response time with loss of flame
during operation. For that purpose, manually
disconnect the fuel valves from power and check
the time from this moment the burner control
requires to turn off power to the valve
Turning off power to the fuel valves by the burner
control within the period of time permitted for the
respective time of plant
Further checks may be required, depending on the field of use and the relevant
standards.
After installation and commissioning, the parameterized values and settings must be
documented
by the person
/
heating engineer responsible for the plant. These data can
be printed out with the help of the ACS410 PC software, for example, or must be
written down. The documentation must be checked by the expert and then kept in a
safe place.
Warning!
On the OEM access level of the LME7…, it is possible to make parameter
settings that differ from application standards. When setting the parameters, it
must be made certain that the application will run safely in accordance with
legal requirements. If not observed, there is a risk that safety functions will be
impaired.
